MAX4090EUT+T ,3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown Currentapplications.MAX4090EUT-T -40°C to +85°C 6 SOT23 ABOXThe MAX4090 is available in tiny 6-pin SOT23, ..
MAX4090EUT+T ,3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown CurrentFeaturesThe MAX4090 3V/5V, 6dB video buffer with sync-tip ● Single-Supply Operation from 2.7V to 5. ..
MAX4090EUT-T ,3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown CurrentBlock DiagramPin ConfigurationTOP VIEW VCCTOP VIEWMAX4090INOUT16 FBOUTMAX4090GND 2 5 SHDN2.3kΩCLAMP ..
MAX4090EXT+T ,3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown CurrentBlock DiagramVTOP VIEW CCMAX4090FB SHDN OUTIN6 5 4OUT 1 6 FB OUT2.3kΩMAX4090 CLAMPGND 2 5 SHDNMAX40 ..
MAX4090EXT-T ,3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown CurrentELECTRICAL CHARACTERISTICS(V = 3.0V, GND = 0V, C = 0.1µF from IN to GND, R = infinity to GND, FB sh ..
MAX4091 ,Single/Dual/Quad, Micropower, Single-Supply, Rail-to-Rail Op AmpsFeaturesThe single MAX4091, dual MAX4092, and quad♦ Low-Voltage, Single-Supply Operation (2.7V to 6 ..
MAX775ESA+T ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC ControllersELECTRICAL CHARACTERISTICS(V+ = 5V, I = 0mA, C = 0.1µF, T = T to T , unless otherwise noted. Typica ..
MAX776 ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IApplicationsOrdering Information continued on last page.Data CommunicatorsTypical Operating Circuit ..
MAX776CPA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersFeaturesThe MAX774/MAX775/MAX776 inverting switching ' 85% Efficiency for 5mA to 1A Load Currentsre ..
MAX776CSA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersMAX774/MAX775/MAX77619-0191; Rev 1; 3/94-5V/-12V/-15V or Adjustable, High-Efficiency, Low I Inverti ..
MAX776CSA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersGeneral Description ________
MAX776CSA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersApplicationsData Communicators__________Typical Operating Circuit __________________Pin Configurati ..
MAX4090AAUT+T-MAX4090AAXT+T-MAX4090EUT-MAX4090EUT+T-MAX4090EXT+T
3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown Current
General DescriptionThe MAX4090 3V/5V, 6dB video buffer with sync-tip
clamp, and low-power shutdown mode is available in
tiny SOT23, SC70, and µDFN packages. The MAX4090
is designed to drive DC-coupled, 150Ω back-terminated
video loads in portable video applications such as digi-
tal still cams, portable DVD players, digital camcorders,
PDAs, video-enabled cell phones, portable game sys-
tems, and notebook computers. The input clamp positions
the video waveform at the output and allows the MAX4090
to be used as a DC-coupled output driver.
The MAX4090 operates from a single 2.7V to 5.5V sup-
ply and consumes only 6.5mA of supply current. The
low-power shutdown mode reduces the supply current to
150nA, making the MAX4090 ideal for low-voltage, bat-
tery-powered video applications.
The MAX4090 is available in tiny 6-pin SOT23, SC70,
and µDFN packages and is specified over the extended
(-40°C to +85°C) and automotive (-40°C to +125°C)
temperature ranges.
Applications●Portable Video/Game Systems/DVD Players●Digital Camcorders/Televisions/Still Cameras●PDAs●Video-Enabled Cell Phones●Notebook Computers●Portable/Flat-Panel Displays
Features●Single-Supply Operation from 2.7V to 5.5V●Input Sync-Tip Clamp●DC-Coupled Output●Low-Power Shutdown Mode Reduces Supply Current
to 150nA●Available in Space-Saving SOT23, SC70, and µDFN
Packages
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARKMAX4090EXT-T-40°C to +85°C6 SC70ABM
MAX4090EUT-T-40°C to +85°C6 SOT23ABOX
MAX4090ELT-T-40°C to +85°C6 µDFNAAI
MAX4090AAXT-T-40°C to +125°C6 SC70ACW
MAX4090AAUT-T-40°C to +125°C6 SOT23ABWQ
MAX4090AALT-T-40°C to +125°C6 µDFNAAN
MAX4090
CLAMP
1.2kΩ
2.3kΩ
580Ω780Ω
OUT
SHDN
GND
VCC
GND
VCCIN6FBSHDN
OUT
MAX4090
SC70/SOT2342354OUTSHDN
VCCINGND
MAX4090
µDFN
TOP VIEW
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Block Diagram
Ordering Information
Pin Conigurations
VCC to GND ........................................................... -0.3V to +6V
OUT, FB, SHDN to GND ......................... -0.3V to (VCC + 0.3V)
IN to GND (Note 1) ............................... VCLP to (VCC + 0.3V)
IN Short-Circuit Duration from -0.3V to VCLP .....................1min
Output Short-Circuit Duration to VCC or GND ........ Continuous
Continuous Power Dissipation (TA = +70°C)6-Pin SOT23 (derate 8.7mW/°C above +70°C) .........695mW6-Pin SC70 (derate 3.1mW/°C above +70°C) ............245mW6-Pin µDFN (derate 3.6mW/°C above +70°C) ............290mW
Operating Temperature Range
MAX4090E......................................................-40°C to +85°C
MAX4090A ....................................................-40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
(VCC = 3.0V, VGND = 0V, CIN = 0.1µF from IN to GND, RL = infinity to GND, FB shorted to OUT, VSHDN = 3.0V, TA = -40°C to +85°C
(MAX4090E), TA = -40°C to +125°C (MAX4090A). Typical values are at TA = +25°C, unless otherwise noted.) (Note 2)
Note 1: VCLP is the input clamp voltage as defined in the DC Electrical Characteristics table.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVCCGuaranteed by PSRR 2.75.5V
Quiescent Supply CurrentICCVIN = VCLP
VCC = 3V6.510mA
VCC = 5V6.510
Shutdown Supply CurrentISHDNVSHDN = 0V0.151µA
Input Clamp Voltage VCLPInput referred0.270.380.47V
Input Voltage Range VINInferred from voltage gain (Note 3)VCLP1.45V
Input Bias CurrentIBIASVIN = 1.45V22.535µA
Input ResistanceVCLP + 0.5V < VIN < VCLP + 1V3MΩ
Voltage Gain AVRL = 150Ω, 0.5V < VIN < 1.45V (Note 4)1.922.1V/V
Power-Supply Rejection RatioPSRR2.7V < VCC < 5.5V6080dB
Output-Voltage High SwingVOHRL = 150Ω to GNDVCC = 3V2.552.7VVCC = 5V4.34.6
Output-Voltage Low SwingVOLRL = 150Ω to GNDVCLP0.47V
Output CurrentIOUTSourcing, RL = 20Ω to GND4585mASinking, RL = 20Ω to VCC4085
Output Short-Circuit CurrentISCOUT shorted to VCC or GND110mA
SHDN Logic-Low ThresholdVILVCC x 0.3V
SHDN Logic-High ThresholdVIHVCC x 0.7V
SHDN Input CurrentIIH0.0031µA
Shutdown Output ImpedanceROUT
(Disabled)
VSHDN = 0V
At DC4At 3.58MHz or
4.43MHz2
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
DC Electrical CharacteristicsStresses 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.
Absolute Maximum Ratings
Note 2: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design.
Note 3: Voltage gain (AV) is referenced to the clamp voltage, i.e., an input voltage of VIN = VCLP + VI would produce an output volt-
age of VOUT = VCLP + AV x VI.
Note 4: Droop is guaranteed by the Input Bias Current specification.
(VCC = 3.0V, VGND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ω to GND, RL = 150Ω to GND, VSHDN = VCC, TA = +25°C, unless
otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSmall-Signal -3dB BandwidthBWSSVOUT = 100mVP-P55MHz
Large-Signal -3dB BandwidthBWLSVOUT = 2VP-P45MHz
Small-Signal 0.1dB Gain FlatnessBW0.1dBSSVOUT = 100mVP-P25MHz
Large-Signal 0.1dB Gain FlatnessBW0.1dBLSVOUT = 2VP-P17MHz
Slew RateSRVOUT = 2V step275V/µs
Settling Time to 0.1%tSVOUT = 2V step 25ns
Power-Supply Rejection RatioPSRRf = 100kHz50dB
Output ImpedanceZOUTf = 5MHz2.5Ω
Differential GainDGNTSCVCC = 3V1%VCC = 5V0.5
Differential PhaseDPNTSCVCC = 3V0.8DegreesVCC = 5V0.5
Group Delay D/dTf = 3.58MHz or 4.43MHz20ns
Peak Signal to RMS Noise SNRVIN = 1VP-P, 10MHz BW65dB
Droop CIN = 0.1µF (Note 4)23%
SHDN Enable TimetONVIN = VCLP + 1V, VSHDN = 3V, VOUT
settled to within 1% of the final voltage250ns
SHDN Disable TimetOFFVIN = VCLP + 1V, VSHDN = 0V, VOUT
settled to below 1% of the output voltage50ns
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
AC Electrical Characteristics
(VCC = 3.0V, GND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ω to GND, RL = 150Ω to GND, SHDN = VCC, TA = +25°C, unless
otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYMAX4090 toc09
PSRR (dB)
10M1M100k
10k100M
VCC = 3V
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCYMAX4090 toc08
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 5V
VOUT = 2VP-P
LARGE-SIGNAL GAIN
vs. FREQUENCYMAX4090 toc07
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 5V
VOUT = 2VP-P
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCYMAX4090 toc06
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 3V
VOUT = 2VP-P
LARGE-SIGNAL GAIN
vs. FREQUENCYMAX4090 toc05
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 3V
VOUT = 2VP-P
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCYMAX4090 toc04
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 5V
VOUT = 100mVP-P
SMALL-SIGNAL GAIN
vs. FREQUENCYMAX4090 toc03
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 5V
VOUT = 100mVP-P
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCYMAX4090 toc02
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 3V
VOUT = 100mVP-P
SMALL-SIGNAL GAIN
vs. FREQUENCYMAX4090 toc01
FREQUENCY (Hz)
GAIN (dB)
10M1M
100k100M
AV = 2
VCC = 3V
VOUT = 100mVP-P
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Typical Operating Characteristics
LARGE-SIGNAL PULSE RESPONSEMAX4090 toc16
VOUT
1V/div
VIN
500mV/div
10ns/div
(VCC = 3.0V, GND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ω to GND, RL = 150Ω to GND, SHDN = VCC, TA = +25°C, unless
otherwise noted.)
OUTPUT-VOLTAGE HIGH SWING
vs. TEMPERATUREMAX4090 toc15
OUTPUT-VOLTAGE HIGH (V)
VCC = 5V
OUTPUT-VOLTAGE HIGH SWING
vs. TEMPERATUREMAX4090 toc14
TEMPERATURE (°C)
OUTPUT-VOLTAGE HIGH (V)
VCC = 3V
VOLTAGE GAIN
vs. TEMPERATUREMAX4090 toc13
TEMPERATURE (°C)
GAIN (V/V)
CLAMP VOLTAGE
vs. TEMPERATURE
MAX4090 toc12
TEMPERATURE (°C)
CLAMP
(V)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4090 toc11
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
VCC = 5V
VCC = 3V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYMAX4090 toc10
FREQUENCY (Hz)
PSRR (dB)
10M1M100k
10k100M
VCC = 5V
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Typical Operating Characteristics (continued)
(VCC = 3.0V, GND = 0V, FB shorted to OUT, CIN = 0.1µF, RIN = 75Ω to GND, RL = 150Ω to GND, SHDN = VCC, TA = +25°C, unless
otherwise noted.)
PIN
NAMEFUNCTIONSOT23/
SC70µDFN4OUTVideo Output2GNDGround3INVideo Input1VCC
Power-Supply Voltage. Bypass
with a 0.1µF capacitor to
ground as close to pin as
possible.5SHDN
Shutdown. Pull SHDN low to
place the MAX4090 in low-
power shutdown mode.6FBFeedback. Connect to OUT.
MAX4090
CLAMP
OUT
GND
VCC
SHDN
RIN
DIFFERENTIAL GAIN AND PHASEDIFFERENTIAL
PHASE ()
DIFFERENTIAL
GAIN (%)
MAX4090 toc18123456123456
SMALL-SIGNAL PULSE RESPONSE
MAX4090 toc17
VOUT
50mV/div
VIN
25mV/div
10ns/div
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Typical Application CircuitPin Description
Typical Operating Characteristics (continued)
Detailed DescriptionThe MAX4090 3V/5V, 6dB video buffer with sync-tip
clamp and low-power shutdown mode is available in tiny
SOT23 and SC70 packages. The MAX4090 is designed
to drive DC-coupled, 150Ω back-terminated video loads in
portable video applications such as digital still cams, por-
table DVD players, digital camcorders, PDAs, video-en-
abled cell phones, portable game systems, and notebook
computers. The input clamp positions the video waveform
at the output and allows the MAX4090 to be used as a
DC-coupled output driver.
The MAX4090 operates from a single 2.7V to 5.5V sup-
ply and consumes only 6.5mA of supply current. The
low-power shutdown mode reduces the supply current to
150nA, making the MAX4090 ideal for low-voltage, bat-
tery-powered video applications.
The input signal to the MAX4090 is AC-coupled through
a capacitor into an active sync-tip clamp circuit, which
places the minimum of the video signal at approximately
0.38V. The output buffer amplifies the video signal while
still maintaining the 0.38V clamp voltage at the output.
For example, if VIN = 0.38V, then VOUT = 0.38V. If VIN
= 1.38V, then VOUT = 0.38V + (2 x 1V) = 2.38V. The net
result is that a 2V video output signal swings within the
usable output voltage range of the output buffer when
VCC = 3V.
Shutdown ModeThe MAX4090 features a low-power shutdown mode
(ISHDN = 150nA) for battery-powered/portable applica-
tions. Pulling the SHDN pin high enables the output.
Connecting the SHDN pin to ground (GND) disables the
output and places the MAX4090 into a low-power shut-
down mode.
Applications Information
Input Coupling the MAX4090The MAX4090 input must be AC-coupled because the
input capacitor stores the clamp voltage. The MAX4090
requires a typical value of 0.1µF for the input clamp
to meet the Line Droop specification. A minimum of a
ceramic capacitor with an X7R temperature coef-
ficient is recommended to avoid temperature-related
problems with Line Droop. For extended temperature
operation, such as outdoor applications, or where the
impressed voltage is close to the rated voltage of the
capacitor, a film dielectric is recommended. Increasing
the capacitor value slows the clamp capture time.
Values above 0.5µF should be avoided since they do
The active sync-tip clamp also requires that the input
impedance seen by the input capacitor be less than
100Ω typically to function properly. This is easily met
by the 75Ω input resistor prior to the input-coupling
capacitor and the back termination from a prior stage.
Insufficient input resistance to ground causes the
MAX4090 to appear to oscillate. Never operate the
MAX4090 in this mode.
Using the MAX4090 with the
Reconstruction FilterIn most video applications, the video signal generated
from the DAC requires a reconstruction filter to smooth
out the signal and attenuate the sampling aliases. The
MAX4090 is a direct DC-coupled output driver, which
can be used after the reconstruction filter to drive the
video signal. The driving load from the video DAC can
be varied from 75Ω to 300Ω. A low input impedance
(<100Ω) is required by the MAX4090 in normal operation,
special care must be taken when a reconstruction filter is
used in front of the MAX4090.
For standard video signal, the video passband is about
6MHz and the system oversampling frequency is at
27MHz. Normally, a 9MHz BW lowpass filter can be
used for the reconstruction filter. This section demon-
strates the methods to build simple 2nd- and 3rd-order
passive butterworth lowpass filters at the 9MHz cutoff
frequency and the techniques to use them with the
MAX4090 (Figures 1 and 4).
2nd-Order Butterworth Lowpass Filter RealizationTable 1 shows the normalized 2nd-order butterworth
LPF component values at 1rad/s with a source/load
impedance of 1Ω.
With the following equations, the L and C can be calcu-
lated for the cutoff frequency at 9MHz. Table 2 shows
the appropriated L and C values for different source/
load impedance, the bench measurement values for
the -3dB BW and attenuation at 27MHz. There is
approximately 20dB attenuation at 27MHz, which effec-
tively attenuates the sampling aliases. The MAX4090
requires low input impedance for stable operation and
it does not like the reactive input impedance. For R1/R2
greater than 100Ω, a series resistor RIS (Figure 1)
Table 1. 2nd-Order Butterworth Lowpass
Filter Normalized Values
Rn1 = Rn2 (Ω)Cn1 (F)Ln1 (H)1.4141.414
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
between 20Ω to 100Ω is needed to isolate the input
capacitor (C4) to the filter to prevent the oscillation
problem.nLCLRC L2fR2f==ππ
Figure 2 shows the frequency response for R1 = R2 =
150Ω. At 6MHz, the attenuation is about 1.4dB. The
attenuation at 27MHz is about 20dB. Figure 3 shows
the multiburst response for R1 = R2 = 150Ω.
3rd-Order Butterworth Lowpass Filter RealizationIf more flat passband and more stopband attenuation are
needed, a 3rd-order LPF can be used. The design proce-
dures are similar to the 2nd-order butterworth LPF.
Table 3 shows the normalized 3rd-order butterworth
lowpass filter with the cutoff frequency at 1 rad/s and
the stopband frequency at 3 rad/s. Table 4 shows the
appropriated L and C values for different source/load
impedance and the bench measurement values for
-3dB BW and attenuation at 27MHz. The attenuation is
over 40dB at 27MHz. At 6MHz, the attenuation is approx-
imately 0.6dB for R1 = R2 = 150Ω (Figure 5).
Figure 3. Multiburst ResponseFigure 2. Frequency Response
Figure 1. 2nd-Order Butterworth LPF with MAX4090
VOUT
500mV/div
10µs/div
VIN
500mV/div
FREQUENCY RESPONSE
FREQUENCY (MHz)
GAIN (dB)
150Ω
150Ω
150pF
3.9µH
0.1µF
75Ω
1µFOUT
GNDSHDN
VCC
VCC
VCC
VOUTVIDEO
CURRENT
DAC
RIS
49.9Ω
2-POLE RECONSTRUCTION LPF
MAX4090
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Sag CorrectionIn a 5V application, the MAX4090 can use the sag
configuration if an AC-coupled output video signal is
required. Sag correction refers to the low-frequency
compensation for the highpass filter formed by the
150Ω load and the output capacitor. In video applica-
tions, the cutoff frequency must be low enough to pass
the vertical sync interval to avoid field tilt. This cutoff
frequency should be less than 5Hz, and the coupling
capacitor must be very large in normal configuration,
typically > 220µF. In sag configuration, the MAX4090
eliminates the need for large coupling capacitors, and
instead requires two 22µF capacitors (Figure 6) to
reach the same performance as the large capacitor.
Bench experiments show that increasing the output
coupling capacitor C5 beyond 47µF does not improve
the performance. If the supply voltage is less than
4.5V, the sag correction is not recommended for the
MAX4090.
Table 4. Bench Measurement Values
Table 3. 3rd-Order Butterworth Lowpass
Filter Normalized Values
Table 2. Bench Measurement ValuesFigure 4. 3rd-Order Butterworth LPF with MAX4090
R1 = R2 (Ω)C1 (pF)C2 (pF)C3 (pF)L (µH)RIS (Ω)3dB BW (MHz)ATTENUATION AT
27MHz (dB)22022015.02.209.343
Rn1 = Rn2
(Ω)Cn1 (F)Cn2 (F)Cn3 (F)Ln1 (H)0.9230.9230.061.846
R1 = R2
(Ω)
(pf)
(ΜH)
RIS
(Ω)
3dB
(MHz)
ATTENUATION
AT 27MHz
(dB)3301.808.720
150Ω
150Ω
120pF
120pF
4.7µH
6.8pF
0.1µFR3
75Ω
1µFOUT
GNDSHDN
VCC
VCC
VCC
VOUTVIDEO
CURRENT
DAC
RIS
49.9Ω
3-POLE RECONSTRUCTION LPF
MAX4090
MAX40903V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current