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MAX9507ATE+T
1.8V, DirectDrive Video Filter Amplifier with Load Detection and Dual SPST Analog Switches
General DescriptionThe MAX9507 amplifies and filters standard-definition
video signals and only consumes 5.8mW quiescent
power and 11.7mW average power. The MAX9507
leverages Maxim’s DirectDrive™ technology to gener-
ate a clean, internal negative supply. Combining the
internal negative power supply with the external posi-
tive 1.8V supply, the MAX9507 is able to drive a 2VP-P
video signal into a 150Ωload.
The MAX9507 provides an I2C interface for easy configu-
ration and access to the load status. The MAX9507 can
detect, report, and act upon the change of a video load.
This feature helps reduce overall power consumption by
allowing the system to turn on the video encoder and dri-
ver only when a video load is connected to the MAX9507.
With a high power-supply rejection ratio (47dB at
100kHz), the MAX9507 can be powered directly from a
1.8V digital supply. The two integrated single-pole/sin-
gle-throw (SPST) analog switches are ideal for routing
audio, video, or digital signals.
The input of the MAX9507 can be directly connected to
the output of a video DAC. The MAX9507 also features
a transparent input sync-tip clamp, allowing AC-cou-
pling of input signals with different DC biases.
The MAX9507 has an internal fixed gain of 8. The input
full-scale video signal is nominally 0.25VP-P, and the
output full-scale video signal is nominally 2VP-P.
Features1.8V or 2.5V Single-Supply OperationLow Power Consumption (5.8mW Quiescent,
11.7mW Average)Video Load DetectionDirectDrive Sets Video Output Black Level Near
GroundDual SPST Analog SwitchesTransparent Input Sync-Tip ClampI2C Control
ApplicationsMobile Phones
Portable Media Players (PMP)
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
Block Diagram
Ordering Information
PARTPIN-PACKAGEPKG CODETOP
MARKMAX9507ATE+16 TQFN-EP*T1633+4AFH
19-1028; Rev 0; 11/07
Pin Configuration appears at end of data sheet.
Note:This device is specified over the -40°C to +125°C operat-
ing temperature range.
+Denotes a lead-free package.
*EP = Exposed pad.
EVALUATION KITAVAILABLE2VP-P VIDEO
MAX9507
AV =
8V/V
LINEAR
REGULATOR
CHARGE
PUMP
LOAD DETECT
I2C
TRANSPARENT
CLAMP
OUT
COM1
COM2
LCF
NO1
NO2
250mVP-P VIDEO
LPF
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +1.8V, GND = 0V, OUT has RL= 150Ωconnected to GND, transparent sync-tip clamp enabled, C1= C2= 1µF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(Voltages with respect to GND.)
VDD...........................................................................-0.3V to +3V
CPGND..................................................................-0.1V to +0.1V
IN................................................................-0.3V to (VDD+ 0.3V)
OUT, NO_,
COM_.................(The greater of VSSand -1V) to (VDD+ 0.3V)
SDA, SCL, DEV_ADDR, LCF....................................-0.3V to +4V
C1P.............................................................-0.3V to (VDD+ 0.3V)
C1N.............................................................(VSS- 0.3V) to +0.3V
VSS............................................................................-3V to +0.3V
Duration of OUT Short Circuit
to VDD, GND, and VSS.............................................Continuous
Continuous Current
IN, SDA, SCL, DEV_ADDR, LCF....................................±20mA
NO_, COM_.................................................................±100mA
Continuous Power Dissipation (TA= +70°C)
16-Pin TQFN (derate 15.6mW/°C above +70°C)........1250mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVDDGuaranteed by PSRR1.7002.625V
Filter enabled3.15.4Supply CurrentIDDNo load, full operation
modeFilter disabled2.95.1mA
Sleep-Mode Supply CurrentNo load3µA
Shutdown Supply CurrentISHDN0.210µA
Shutdown mode0.2Switch-Only Supply CurrentCharge-pump-only mode520µA
Output Load Detect ThresholdRL to GND, VSYNC-TIP < 13mV200Ω
DC-COUPLED INPUT1.7V ≤ VDD ≤ 2.625V0262.5
Input Voltage RangeGuaranteed by output-
voltage swing2.375V ≤ VDD ≤
2.625V0325mV
Input CurrentIBIN = 130mV23.2µA
Input ResistanceRIN10mV ≤ IN ≤ 250mV280kΩ
Output LevelIN = 80mV-75+5+75mV
AC-COUPLED INPUTSync-Tip Clamp LevelVCLPCIN = 0.1µF-80+11mV
1.7V ≤ VDD ≤ 2.625V252.5
Input-Voltage SwingGuaranteed by output-
voltage swing2.375V ≤ VDD ≤
2.625V325mVP-P
Sync CrushPercentage reduction in sync pulse at output,
RSOURCE = 37.5Ω, CIN = 0.1µF1.6%
Input Clamping CurrentIN = 130mV23.2µA
Line-Time DistortionCIN = 0.1µF0.2%
Minimum Input Source
Resistance25Ω
Output LevelIN = 80mV-75+5+75mV
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DC CHARACTERISTICSDC Voltage GainAVGuaranteed by output-voltage swing (Note 2)7.8488.16V/V
0V ≤ VIN ≤ 262.5mV,
DC-coupled input2.0582.12.142
1.7V ≤ VDD ≤ 2.625V0V ≤ VIN ≤
252.5mVP-P,
AC-coupled input
1.9792.022.061Output-Voltage Swing
2.375V ≤ VDD ≤ 2.625V, 0V ≤ VIN ≤ 325mV2.5482.62.652
VP-P
Power-Supply Rejection RatioPSRR1.7V ≤ VDD ≤ 2.625V, measured between 75Ω
load resistors4660dB
Shutdown Input Resistance0V ≤ IN ≤ VDD2.8MΩ
Output ResistanceROUTOUT = 0V, -5mA ≤ ILOAD ≤ +5mA0.1Ω
Shutdown Output Resistance0V ≤ OUT ≤ VDD32MΩ
Shutdown OUT Leakage Current1µA
Sourcing82Output Short-Circuit CurrentSinking32mA
AC CHARACTERISTICS (FILTER ENABLED) 1dB passband7.5MHz
f = 5.5MHz0
f = 9.3MHz-3
Standard-Definition
Reconstruction Filter
OUT = 2VP-P,
reference frequency is
100kHz
f = 27MHz-49
f = 3.58MHz0.63Differential GainDGf = 4.43MHz0.93%
f = 3.58MHz0.50Differential PhaseDPf = 4.43MHz0.63Degrees
2T Pulse-to-Bar K Rating
2T = 200ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time is
ignored
0.1K%
2T Pulse Response2T = 200ns0.3K%
2T Bar Response
2T = 200ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time is
ignored
0.2K%
Nonlinearity5-step staircase0.1%
Group-Delay Distortion100kHz ≤ f ≤ 5MHz, OUT = 2VP-P21ns
Peak Signal to RMS Noise100kHz ≤ f ≤ 5MHz65dB
Power-Supply Rejection RatioPSRRf = 100kHz, 100mVP-P47dB
Output Impedancef = 5MHz, IN = 80mV7.5Ω
Shutdown OUT-to-IN Isolationf < 5.5MHz102dB
Shutdown IN-to-OUT Isolationf < 5.5MHz98dB
ELECTRICAL CHARACTERISTICS (continued)(VDD= +1.8V, GND = 0V, OUT has RL= 150Ωconnected to GND, transparent sync-tip clamp enabled, C1= C2= 1µF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
ELECTRICAL CHARACTERISTICS (continued)(VDD= +1.8V, GND = 0V, OUT has RL= 150Ωconnected to GND, transparent sync-tip clamp enabled, C1= C2= 1µF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
AC CHARACTERISTICS (FILTER DISABLED)Small-Signal -3dB BandwidthOUT = 100mVP-P40.7MHz
Large-Signal -3dB BandwidthOUT = 2VP-P9.8MHz
Small-Signal 1dB FlatnessOUT = 100mVP-P32.8MHz
Large-Signal 1dB FlatnessOUT = 2VP-P7.2MHz
Slew RateOUT = 2V step35V/µs
Settling Time to 0.1%OUT = 2V step230ns
f = 3.58MHz0.63Differential GainDGf = 4.43MHz0.94%
f = 3.58MHz0.50Differential PhaseDPf = 4.43MHz0.64Degrees
2T Pulse-to-Bar K Rating
2T = 200ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time is
ignored
0.1K%
2T Pulse Response2T = 200ns0.2K%
2T Bar Response
2T = 200ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time is
ignored
0.2K%
Nonlinearity5-step staircase0.1%
Group-Delay Distortion100kHz ≤ f ≤ 5MHz, OUT = 2VP-P15ns
Peak Signal to RMS Noise100kHz ≤ f ≤ 5MHz69dB
Power-Supply Rejection RatioPSRRf = 100kHz, 100mVP-P42dB
Output Impedancef = 5MHz, IN = 80mV7.5Ω
Shutdown OUT-to-IN Isolationf < 5.5MHz102dB
Shutdown IN-to-OUT Isolationf < 5.5MHz98dB
CHARGE PUMPSwitching Frequency3256251150kHz
ANALOG SWITCHESNormal range1.22.2On-Resistance (Note 3)RONICOM_ = 10mA,
VNO_ = 0VExtended range1.22.2Ω
Normal range,
VNO_ = 0V, 1V, VDD2.3
On-Resistance Flatness
(Notes 3, 4)RFLAT(ON)ICOM_ = 10mA
Extended range, VNO_ =
-0.9V, 0V, +1.2V, VDD0.31.1
NO_ Off-Leakage Current
Normal RangeINO_(OFF)NVDD = 2.625V, VCOM_ = 0.3V, 2.3V;
VNO_ = 2.3V, 0.3V; TA = +25°C (Notes 3, 5)-100+100nA
COM_ On-Leakage Current
Normal RangeICOM_(ON)NV D D = 2.625V , V N O_ = hi g h- Z ,C OM _ = 0.3V , 2.3V ; TA = + 25° C ( N otes 3, 5) -100+100nA
NO_ Off-Leakage Current,INO_(OFF)EV D D = 2.625V , V C OM _ = - 0.6V , + 2.3V ;-100+100nA
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
ELECTRICAL CHARACTERISTICS (continued)(VDD= +1.8V, GND = 0V, OUT has RL= 150Ωconnected to GND, transparent sync-tip clamp enabled, C1= C2= 1µF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSCOM_ On-Leakage Current,
Extended RangeICOM_(ON)EV D D = 2.625V , V N O_ = hi g h- Z ,C OM _ = - 0.6V , + 2.3V ; TA = + 25°C ( N otes 3, 5) -100+100nA
Turn-On TimetONVNO_ = 0.9V, RL = 300Ω, CL = 35pF,
Figure 1 (Note 6)310ns
Turn-Off TimetOFFVNO_ = 0.9V, RL = 300Ω, CL = 35pF,
Figure 1 (Note 6)372ns
Charge InjectionQVGEN = 0.9V, RGEN = 0Ω, CL = 1nF,
Figure 260pC
f = 10MHz49Off-IsolationVISOVNO_ = 1VP-P, RL = 50Ω,
CL = 5pF, Figure 1f = 1MHz69dB
On-Channel -3dB BandwidthBWVNO_ = 0dBm, RSOURCE = 50Ω, RL = 50Ω,
CL = 5pF, Figure 1280MHz
Total Harmonic DistortionTHDVCOM_ = 1VP-P, RL = 600Ω0.037%
Charge-Pump NoiseExtended range, RL = 50Ω1.2mVP-P
NO_ Off-CapacitanceCOFFf = 1MHz21pF
Switch On-CapacitanceCONf = 1MHz53pF
CROSSTALKf = 10MHz-71
Switch to Switch
Switch 1, 2 closed;
VNO_ = 1VP-P, RL = 50Ω,
CL = 5pF, Figure 1f = 1MHz-88
f = 10MHz-44
NO_ to OUT
Switch 1, 2 open; video
circuitry enabled,
VNO_ = 1VP-Pf = 1MHz-78
OUT to NO_
Switch 1, 2 closed; video circuitry enabled,
f = 20kHz, OUT = 2VP-P, RL = 50Ω,
CL = 5pF
-94dB
IN to COM_S w i tch 1, 2 cl osed ; vi d eo ci r cui tr y d i sab l ed ,
f = 20kHz, IN = 0.25VP-P, RL = 600Ω-89dB
OUT to COM_
Switch 1, 2 closed; video circuitry enabled,
f = 20kHz, OUT = 2VP-P, RL = 50Ω,
CL = 5pF
-94dB
CMOS DIGITAL INPUTS (SDA, SCL, DEV_ADDR)Input Low VoltageVIL0.3 x
VDDV
Input High VoltageVIH0.7 x
VDDV
Input Hysteresis275mV
Input Leakage CurrentIIL, IIH-10+10µA
Input CapacitanceCIN15pF
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DIGITAL OUTPUTS (SDA, LCF)VDD > 2V0.4
Output Low VoltageVOLIOL = 3mAVDD < 2V0.2 x
VDD
Output High Leakage CurrentIOHVOUT = VDD1µA
SERIAL INTERFACE TIMING (Figure 3)Serial Clock FrequencyfSCL0400kHz
Bus Free Time Between STOP
and START ConditionstBUF1.3µs
Hold Time (Repeated) START
ConditiontHD,STA0.6µs
SCL Pulse-Width LowtLOW1.3µs
SCL Pulse-Width HightHIGH0.6µs
Setup Time for a Repeated
START ConditiontSU,STA0.6µs
Data Hold TimetHD,DAT0900ns
Data Setup TimetSU,DAT100ns
Bus CapacitanceCB400pF
SDA and SCL Receiving Rise
TimetR(Note 7)20 +
0.1CB300ns
SDA and SCL Receiving Fall
TimetF(Note 7)20 +
0.1CB300ns
VDD = 1.7V20 +
0.1CB250SDA Transmitting Fall TimetF(Note 7)
VDD = 2.625V0250
Setup Time for STOP ConditiontSU,STO0.6µs
Pulse Width of Suppressed SpiketSP050ns
Note 1:All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Note 2:Voltage gain (AV) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing.
Note 3:Normal range: charge pump disabled. Extended range: charge pump enabled. In extended range mode, the switch input
can swing from -0.9V to VDD.
Note 4:Flatness is defined as the difference between the maximum and minimum values of on-resistance as measured at the speci-
fied voltages.
Note 5:Not production tested, guaranteed by design.
Note 6:tONand tOFFare measured from the end of the writing of register 0x00 until COM reaches 90% of the output voltage. See
Figure 1.
Note 7:CBis in picofarads.
ELECTRICAL CHARACTERISTICS (continued)(VDD= +1.8V, GND = 0V, OUT has RL= 150Ωconnected to GND, transparent sync-tip clamp enabled, C1= C2= 1µF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switchesest Circuits/Timing DiagramsNO_COM_RL
SDAWRITE
REGISTER 00H
tONtOFF
WRITE
REGISTER 00H50%
90%90%
VCOM_
GND
SDASCL2C
VDD
VDD
VNO_VCOM_
MAX9507
Figure 1. Analog Switch Test Circuit
NO_COM_
VGEN
RGEN
VCOM_ΔVCOM_Q = CL x ΔVCOM_
OFFOFF
SWITCH
STATE
GND
SDASCL
I2C
VDD
VCOM_
VDD
MAX9507
Figure 2. Analog Switch Charge Injection
SCL
SDA
START
CONDITION
STOP
CONDITION
REPEATED
START CONDITION
START
CONDITION
tHD,STA
tSU,STA
tHD,STAtSP
tBUF
tSU,STOtLOW
tSU,DAT
tHD,DAT
tHIGHtF
Figure 3. I2C Serial-Interface Timing Diagram
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
Typical Operating Characteristics(VDD= +1.8V, GND = 0V, mode 2 (Table 6), video output has RL= 150Ωconnected to GND, video filter enabled, TA= +25°C,
unless otherwise noted.)
SMALL-SIGNAL GAIN
vs. FREQUENCYMAX9507 toc01
FREQUENCY (Hz)
GAIN (dB)
100M10M1M
100k1G
FLTEN = 0
FLTEN = 1
VOUT = 100mVP-P
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCYMAX9507 toc02
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
FLTEN = 0
FLTEN = 1
VOUT = 100mVP-P
LARGE-SIGNAL GAIN
vs. FREQUENCYMAX9507 toc03
FREQUENCY (Hz)
GAIN (dB)
100M10M1M
100k1G
FLTEN = 0
FLTEN = 1
VOUT = 2VP-P
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCYMAX9507 toc04
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
VOUT = 2VP-P
FLTEN = 1
FLTEN = 0
LARGE-SIGNAL
GROUP DELAY vs. FREQUENCYMAX9507 toc05
FREQUENCY (Hz)
DELAY (ns)
100M10M1M
100k1G
FLTEN = 0
FLTEN = 1
VOUT = 2VP-P
SMALL-SIGNAL
GROUP DELAY vs. FREQUENCYMAX9507 toc06
FREQUENCY (Hz)
DELAY (ns)
100M10M1M
100k1G
FLTEN = 0
FLTEN = 1
VOUT = 100mVP-P
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYMAX9507 toc07
FREQUENCY (Hz)
GAIN (dB)
10M1M100k
10k100M
FLTEN = 0
FLTEN = 1
QUIESCENT SUPPLY CURRENT
vs. TEMPERATUREMAX9507 toc08
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (mA)
FLTEN = 1
FLTEN = 0
VOLTAGE GAIN
vs. TEMPERATUREMAX9507 toc09
TEMPERATURE (°C)
VOLTAGE GAIN (V/V)
-50125
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
OUTPUT VOLTAGE
vs. INPUT VOLTAGEMAX9507 toc10
INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
DIFFERENTIAL GAIN AND PHASE
(FLTEN = 1)
MAX9507 toc11
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (deg)
DC INPUT LEVEL (mV)
DC INPUT LEVEL (mV)
FREQUENCY = 3.58MHz
VIN = 71mVP-P
DIFFERENTIAL GAIN AND PHASE
(FLTEN = 1)MAX9507 toc12
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (deg)
DC INPUT LEVEL (mV)
DC INPUT LEVEL (mV)
FREQUENCY = 4.43MHz
VIN = 71mVP-P
DIFFERENTIAL GAIN AND PHASE
(FLTEN = 0)MAX9507 toc13
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (deg)
DC INPUT LEVEL (mV)
DC INPUT LEVEL (mV)
FREQUENCY = 3.58MHz
VIN = 71mVP-P
DIFFERENTIAL GAIN AND PHASE
(FLTEN = 0)MAX9507 toc14
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (deg)
DC INPUT LEVEL (mV)
DC INPUT LEVEL (mV)
FREQUENCY = 4.43MHz
VIN = 71mVP-P
2T RESPONSEMAX9507 toc15
400ns/div
100mV/div
OUT
500mV/div
12.5T RESPONSEMAX9507 toc16
400ns/div
100mV/div
OUT
500mV/div
NTC-7 RESPONSEMAX9507 toc17
10μs/div
100mV/div
OUT
500mV/div
PAL MULTIBURSTMAX9507 toc18
10μs/div
100mV/div
OUT
1V/div
Typical Operating Characteristics (continued)(VDD= +1.8V, GND = 0V, mode 2 (Table 6), video output has RL= 150Ωconnected to GND, video filter enabled, TA= +25°C,
unless otherwise noted.)
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
PAL COLOR BARSMAX9507 toc19
10μs/div
100mV/div
OUT
1V/div
FIELD SQUARE-WAVE RESPONSE
(AC-COUPLED INPUT)MAX9507 toc20
10μs/div
100mV/div
OUT
500mV/div
SMALL-SIGNAL PULSE RESPONSE
(FLTEN = 0)MAX9507 toc21
100ns/div
INPUT (6.25mV/div)
OUTPUT (50mV/div)
LARGE-SIGNAL PULSE RESPONSE
(FLTEN = 0)MAX9507 toc22
100ns/div
INPUT (125mV/div)
OUTPUT (1V/div)
ON-RESISTANCE vs. COM_ VOLTAGE
(NORMAL RANGE) MAX9507 toc23
COM_ VOLTAGE (V)
ON-RESISTANCE (
VDD = 2.5V
VDD = 1.8V
ON-RESISTANCE vs. COM_ VOLTAGE
(EXTENDED RANGE)MAX9507 toc24
COM_ VOLTAGE (V)
ON-RESISTANCE (
VDD = 2.5V
VDD = 1.8V
ON-RESISTANCE vs. COM_ VOLTAGE
(NORMAL RANGE)MAX9507 toc25
COM_ VOLTAGE (V)
ON-RESISTANCE (
TA = -40°C
TA = +25°C
TA = +125°C
ON-RESISTANCE vs. COM_ VOLTAGE
(EXTENDED RANGE)MAX9507 toc26
COM_ VOLTAGE (V)
ON-RESISTANCE (
TA = -40°C
TA = +25°C
TA = +125°C
ANALOG SWITCH LEAKAGE CURRENT
vs. TEMPERATURE (NORMAL RANGE)MAX9507 toc27
TEMPERATURE (°C)
LEAKAGE CURRENT (nA)
COMON
COMOFF
VDD = 2.625V
Typical Operating Characteristics (continued)(VDD= +1.8V, GND = 0V, mode 2 (Table 6), video output has RL= 150Ωconnected to GND, video filter enabled, TA= +25°C,
unless otherwise noted.)
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
ANALOG SWITCH LEAKAGE CURRENT
vs. TEMPERATURE (EXTENDED RANGE)MAX9507 toc28
TEMPERATURE (°C)
LEAKAGE CURRENT (nA)
COMON
COMOFF
VDD = 2.625V
SWITCH CHARGE INJECTION
vs. VOLTAGEMAX9507 toc29
SWITCH INPUT VOLTAGE (V)
SWITCH CHARGE INJECTION (pC)
CLOAD = 1nF
OPEN = 1
OPEN = 0
SWITCH-ONLY SUPPLY CURRENT
vs. TEMPERATURE (NORMAL RANGE)MAX9507 toc30
TEMPERATURE (°C)
SUPPLY CURRENT (nA)
SPEN = 0
CPEN = 0
SWITCH FREQUENCY RESPONSEMAX9507 toc31
FREQUENCY (Hz)
GAIN (dB)
100M10M1M
100k1G
RL = 50Ω
CL = 5pF
SWITCH OFF-ISOLATION
vs. FREQUENCYMAX9507 toc32
FREQUENCY (Hz)
GAIN (dB)
100M10M1M
100k1G
SWITCH-TO-SWITCH CROSSTALK
vs. FREQUENCYMAX9507 toc33
FREQUENCY (Hz)
ISOLATION (dB)
10M1M
100k100M
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCYMAX9507 toc34
FREQUENCY (Hz)
THD+N (%)
10k1k10010100k
VIN = 2VP-P
RLOAD = 600Ω
Typical Operating Characteristics (continued)(VDD= +1.8V, GND = 0V, mode 2 (Table 6), video output has RL= 150Ωconnected to GND, video filter enabled, TA= +25°C,
unless otherwise noted.)
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
Pin Description
PINNAMEFUNCTIONINVideo InputSDAI2C-Compatible Serial-Data Input/OutputSCLI2C-Compatible Serial-Clock InputDEV_ADDRI2C Device Address Input. Connect DEV_ADDR to GND, VDD, SCL, or SDA. See Table 4.
5VDDPositive Power Supply. Bypass with a 0.1µF capacitor to GND.C1PCharge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor from C1P to C1N.CPGNDCharge-Pump GroundC1NCharge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to C1N.
9VSSCharge-Pump Negative Power Supply. Bypass with a 1µF capacitor to GND.OUTVideo OutputGNDGroundLCFLoad Change Flag. Open-drain, active-low signal indicates when a video load change occurs.NO1Normally Open Terminal 1COM1Common Terminal 1COM2Common Terminal 2NO2Normally Open Terminal 2EPExposed Pad. EP is internally connected to GND. Connect EP to GND.
Detailed DescriptionThe MAX9507 represents Maxim’s second-generation
of DirectDrive video amplifiers that meet the require-
ments of current and future portable equipment:1.8V Operation: Eliminate the need for 3.3V supply in
favor of lower supply voltages.Lower Power Consumption: The MAX9507 reduces
average power consumption by up to 75% com-
pared to the 3.3V first generation (MAX9503/
MAX9505).Internal Fixed Gain of 8: As the supply voltages drop
for system chips on deep submicron processes, the
video DAC can no longer create a 1VP-Psignal at its
output, and the gain of 2 found in the previous gen-
eration of video filter amplifiers is not enough.Load Reporting: The MAX9507 senses the presence
of a video load. For portable devices, a video load is
not connected most of the time, and turning off the
video encoder saves power. Another benefit of load
reporting is a simpler user interface, eliminating the
need to browse through menus to activate the video
output. Instead, the equipment will automatically
enable this feature.Dual SPST Analog Switches: The two analog switch-
es are ideal for routing additional audio, video, or
digital signals.
DirectDrive technology is necessary for a voltage-mode
amplifier to output a 2VP-Pvideo signal from a 1.8V
supply. The integrated inverting charge pump creates
a negative supply that increases the output range and
gives the video amplifier enough headroom to drive a
2VP-Pvideo signal into a 150Ωload.
DirectDrive
BackgroundIntegrated video filter amplifier circuits operate from a
single supply. The positive power supply usually cre-
ates video output signals that are level-shifted above
ground to keep the signal within the linear range of the
output amplifier. For applications where the positive DC
level is not acceptable, a series capacitor can be
inserted in the output connection in an attempt to elimi-
nate the positive DC level shift. The series capacitor
cannot truly level shift a video signal because the aver-
age level of the video varies with picture content. The
series capacitor biases the video output signal around
ground, but the actual level of the video signal can vary
significantly depending upon the RC time constant and
the picture content.
The series capacitor creates a highpass filter. Since the
lowest frequency in video is the frame rate, which can be
between 24Hz and 30Hz, the pole of the highpass filter
should ideally be an order of magnitude lower in fre-
quency than the frame rate. Therefore, the series capaci-
tor must be very large, typically from 220µF to 3000µF.
For space-constrained equipment, the series capacitor
is unacceptable. Changing from a single series capaci-
tor to a SAG network that requires two smaller capacitors
can only reduce space and cost slightly.
The series capacitor in the usual output connection
also prevents damage to the output amplifier if the con-
nector is shorted to a supply or to ground. While the
output connection of the MAX9507 does not have a
series capacitor, the MAX9507 will not be damaged if
the connector is shorted to a supply or to ground (see
the Short-Circuit Protection section).
Video AmplifierIf the full-scale video signal from a video DAC is
250mV, the black level of the video signal created by
the video DAC is around 75mV. The MAX9507 shifts the
black level to near ground at the output so that the
active video is above ground and the sync is below
ground. The amplifier needs a negative supply for its
output stage to remain in its linear region when driving
sync below ground.
The MAX9507 has an integrated charge pump and lin-
ear regulator to create a low-noise negative supply
from the positive supply voltage. The charge pump
inverts the positive supply to create a raw negative volt-
age that is then fed into the linear regulator filtering out
the charge-pump noise.
Comparison Between DirectDrive Output
and AC-Coupled OutputThe actual level of the video signal varies less with a
DirectDrive output than an AC-coupled output. The
average video signal level can change greatly depend-
ing upon the picture content. With an AC-coupled out-
put, the average level will change according to the time
constant formed by the series capacitor and series
resistance (usually 150Ω). For example, Figure 4 shows
an AC-coupled video signal alternating between a
completely black screen and a completely white
screen. Notice the excursion of the video signal as the
screen changes.
With the DirectDrive amplifier, the black level is held at
ground. The video signal is constrained between -0.3V
to +0.7V. Figure 5 shows the video signal from a
DirectDrive amplifier with the same input signal as the
AC-coupled system.
Video Reconstruction FilterThe MAX9507 includes an internal five-pole,
Butterworth lowpass filter to condition the video signal.
The reconstruction filter smoothes the steps and
reduces the spikes created whenever the DAC output
changes value. In the frequency domain, the steps and
spikes cause images of the video signal to appear at
multiples of the sampling clock frequency. The recon-
struction filter typically has ±1dB passband flatness of
7.3MHz and 48dB attenuation at 27MHz.
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog SwitchesINPUT
OUTPUT
2ms/div
INPUT
OUTPUT
2ms/div
Figure 4. AC-Coupled Output
Figure 5. DirectDrive Output
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
Transparent Sync-Tip ClampThe MAX9507 contains an integrated, transparent
sync-tip clamp. When using a DC-coupled input, the
sync-tip clamp does not affect the input signal, as long
as it remains above ground. When using an AC-cou-
pled input, the sync-tip clamp automatically clamps the
input signal to ground, preventing it from going lower. A
small current of 2µA pulls down on the input to prevent
an AC-coupled signal from drifting outside the input
range of the device.
Using an AC-coupled input results in some additional
variation of the black level at the output. Applying a
voltage above ground to the input pin of the device
always produces the same output voltage, regardless
of whether the input is DC- or AC-coupled. However,
since the sync-tip clamp level (VCLP) can vary over a
small range, the video black level at the output of the
device when using an AC-coupled input can vary by an
additional amount equal to the VCLPmultiplied by the
DC voltage gain (AV).
Dual SPST Analog SwitchesThe MAX9507 has dual SPST analog switches for rout-
ing additional audio, video, digital, and other signals.
The switches are selected through the I2C interface.
SW1EN (register 0x00, bit B6) and SW2EN (register
0x00, bit B7) control the analog switches. See the I2C
Registers and Bit Descriptionssection.The dual analog
switches operate in either normal or extended range. In
normal range, the part is in shutdown and the analog
switches can handle signals between GND and VDD. In
extended range, the charge pump and linear regulator
are on and the analog switches can handle signals
between -0.9V and VDD.
Short-Circuit ProtectionThe MAX9507 typical operating circuit includes a 75Ω
back-termination resistor that limits short-circuit current
if an external short is applied to the video output. The
MAX9507 also features internal output short-circuit pro-
tection to prevent device damage in prototyping and
applications where the amplifier output can be directly
shorted.
Powering On/Off the MAX9507The MAX9507 powers on in a low-power shutdown
mode with the analog switches open and the video sig-
nal path, charge pump, and load detection circuitry
disabled. It is good practice to configure the operating
mode of the signal path before enabling it. This may
include selecting the sync-tip clamp and video filter.
Setting CPEN = 1 (register 0x00, bit B0) enables the
charge pump. The charge pump must be fully opera-
tional before the signal path will be functional. Setting
SPEN = 1 (register 0x00, bit B1) enables the signal
path. Both SPEN and CPEN may be set at the same
time and internal control circuitry will monitor the
charge pump and enable the signal path at the appro-
priate time.
The analog switches can be turned on or off at any
time, regardless of the state of the charge pump or sig-
nal path. However, the signal range is limited from GND
to VDDwhen the charge pump is disabled.
The MAX9507 can be placed in a low-power shutdown
mode by setting SPEN = 0 and CPEN = 0.
Video Load Detection CircuitryThe MAX9507 contains video load detection circuitry at
the video output, enabling efficient power consumption
based on the actual presence of a video load. Setting
the automatic signal path enable bit, ASPEN = 1 (regis-
ter 0x01, bit B1) or the automatic charge-pump enable
bit, ACPEN = 1 (register 0x01, bit B0) enables the load
detection feature. The LOAD bit (register 0x01, bit B7)
indicates the load status.
To enable complete, automatic control of the part, set
ASPEN = ACPEN = 1 and SPEN = CPEN = 0. In this
state, when an output load is connected to the amplifi-
er, the signal path and charge pump fully turn on and
stay on until the output load is disconnected. If an out-
put load is not connected to the amplifier, then the sig-
nal path and charge pump remain in a low-power sleep
mode while continuing to check if a load is connected.
Setting SPEN = 1 or CPEN = 1 overrides the corre-
sponding ASPEN or ACPEN bits, enabling the block
regardless of the detected video load status.
The LOAD bit indicates the latest video load status. All
changes to the video load status are debounced typi-
cally 128ms to eliminate false load-detect events.
Setting the load change flag enable bit, LCFEN = 1 (reg-
ister 0x01, bit B3), and enabling the load detection fea-
ture (ASPEN = 1 or ACPEN = 1) enables the open-drain
LCFoutput. LCFasserts low whenever the LOAD bit
changes state. It remains low until the LOAD bit (register
0x01) is read. LCFcan be used as an interrupt to notify
the system that the load status has changed.
MAX9507
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
Sleep ModeIf a video load is not connected to the amplifier, the
MAX9507 remains in a low-power sleep mode. The
load-sense circuitry checks for a load eight times per
second by connecting an internal 7.5kΩpullup resistor
to the output for 1ms. If the output is pulled up, no load
is present. If the output stays low, a load is connected,
and the automatic control circuitry enables the appro-
priate blocks. When the amplifier is on, it continually
checks if the load has been disconnected by detecting
if the amplifier is sinking current during a horizontal line
time. Therefore, a black-burst signal (or input signal
< 13mV) is required to maintain the detected load sta-
tus. If the load is disconnected, the device returns to
the low-power sleep mode.
Common Modes of OperationX = Don’t care.
NO.MODEASPENACPENSPENCPENShutdown mode.
Switches in normal range.
Load-detect function disabled.00
Full operation mode.
Video, charge pump, and regulator on.
Switches in extended range.
XX11
Charge-pump-only mode.
Charge pump and regulator on, video off.
Switches in extended range.
XX01
Sleep mode.
Video, charge pump, and regulator automatic.
Switches in extended range only when the charge
pump is on.
Load-detect function enabled.00
Charge pump and regulator on, video automatic.
Switches in extended range.
Load-detect function enabled.01
2C Registers and Bit Descriptions
Table 1. Register Map
REGISTER
ADDRESSREGISTERB7B6B5B4B3B2B1B0
POWER-ON
RESET
STATE0x00ConfigurationSW2ENSW1EN0STENFLTEN0SPENCPEN0x00
0x01Video Load
DetectLOAD000LCFEN0ASPENACPEN0x00
