DS4420N+ Fast Delivery |IC PHOENIX CO.,LIMITED

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EC2-24 ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
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EC2-4.5NU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-4.5TNU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE

DS4420N+
I²C Programmable Gain Amplifier for Audio Applications
General Description
The DS4420 is a fully differential, programmable-gain
amplifier for audio applications. It features a -35dB to
+25dB gain range controlled by an I2C interface and it
is optimized to drive loads as low as 50Ω. The gain is
adjustable in 3dB increments across the entire range.
Three address inputs, used to select the I2C slave
address, enable up to eight devices on a common bus.
The product operates from a single 5V supply over a
-20°C to +70°C temperature range. It is offered in a
3mm x 3mm TDFN package.
Applications
Telephone Headsets
Audio Volume Control
Microphone Gain Control
FeaturesDifferential Inputs and Outputs-35dB to +25dB Adjustable GainLow Output NoiseLow-Distortion Driving into a 50ΩLoad3dB Gain Steps Programmed through I2C Interface5V Single Supply20kHz Bandwidth for All Gain SettingsSmall 3mm x 3mm x 0.8mm TDFN PackageUp to Eight DS4420s can be Placed on the Same2C Bus
DS44202C Programmable-Gain Amplifier
for Audio Applications
Rev 0; 9/06
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
DS4420+-20°C to +70°C14 TDFN-EP*
+Denotes lead-free package.
*EP = Exposed paddle.
DS4420
-35dB
TO +25dB
GAIN
SDA
SCL
IN+
OUT+
OUT-
IN-
GNDVCCAGNDAVCC
AUDIO
AMPLIFIER
AUDIO
SOURCE
MICROPR0CESSOR-
CONTROLLED GAIN
I2C INTERFACE
Typical Operating Circuit
TDFN
(3mm x 3mm x 0.8mm)
TOP VIEW
OUT+
AGND
N.C.
SCL
SDA14AVCC
OUT-12A09IN-VCC8IN+GND
DS4420
Pin Configuration
DS44202C Programmable-Gain Amplifier
for Audio Applications
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(TA= -20°C to +70°C.)
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.
Voltage on VCC, SDA, and SCL
Relative to GND.................................................-0.5V to +6.0V
Voltage on A0, A1, and A2
Relative to GND......................................-0.5V to (VCC+ 0.5V;
not to exceed 6.0V)
Voltage on IN+, IN-, OUT-, and OUT+
Relative to AGND.................................-0.5V to (AVCC+ 0.5V;
not to exceed 6.0V)
Voltage on AVCCRelative to VCC..........................-0.3V to +0.3V
Voltage on AGND Relative to GND.......................-0.3V to +0.3V
Output Current..................................................................150mA
Operating Temperature Range...........................-20°C to +70°C
Storage Temperature.....................See J-STD-020 Specification
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Digital Supply VoltageVCC(Note 1)+4.5+5.5V
Analog Supply VoltageAVCCVCCV
Analog GroundAGND(See Figure 5)GNDV
Input Logic 1 (SCL, SDA, A0, A1, A2)VIH2.0VCC
+ 0.3V
Input Logic 0 (SCL, SDA, A0, A1, A2)VIL-0.3+0.8V
ELECTRICAL CHARACTERISTICS
(VCC = +4.5V to +5.5V, TA = -20°C to +70°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply CurrentICCVCC = 5.5V, RL = ∞, VIN = 0V differential
(Note 9)1.73mA
Standby CurrentISTBYVCC = 5.5V (Notes 2, 9)140µA
Input Leakage (SDA, SCL, A2, A1, A0)IILVCC = 5.5V1µA
Output Leakage (SDA)IL1µA
VOL = 0.4V3Output-Current Low (SDA)IOLVOL = 0.6V6mA
Input Voltage RangeVINDifferential-19+1dBV
Max Peak-to-Peak Input LevelVINP-PDifferential3.2V
Input ResistanceRINDifferential, active mode (Note 3)294960kΩ
Input Common-Mode VoltageVIN:CM0.45 x
VCC
0.55 x
VCCV
Output VoltageVORL = 50Ω differential6dBV
Output Peak-to-Peak Signal SwingVOP-PDifferential5.6V
Output Common-Mode VoltageVO:CM0.45 x
VCC
0.5 x
VCC
0.55 x
VCCV
Output Offset VoltageVO:OSAV = +25dB-20+20mV
VOUT = GND95Amplifier Output Current
(Sourcing)IOS1VOUT = VCC - 0.75V64mA
DS44202C Programmable-Gain Amplifier
for Audio Applications
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +4.5V to +5.5V, TA = -20°C to +70°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VOUT = VCC89Amplifier Output Current
(Sinking)IOS2VOUT = 0.75V64mA
Resistive Load RangeRLDifferential5050kΩ
Capacitive LoadCLCap to GND (Note 4)100pF
Closed-Loop BandwidthAll gain settings (Note 5)2020kHz
Passband Flatness20Hz to 20kHz (Notes 2, 5)-1+1dB
A = -35dB, 300Hz to 3.4kHz-123Output Noise (Note 5)NOA = +25dB, 300Hz to 3.4kHz-88dBV
RL = 50Ω, VO ≤ +6dBV,
f = 1kHz, A = ±16dB0.031.0
Total Harmonic Distortion (Note 5)THD
RL = 1kΩ, VO ≤ +6dBV,
f = 1kHz, A = ±16dB0.01
Gain RangeA-35+25dB
Gain Step SizeAS2.03.04.0dB
Gain AccuracyAERR1(Note 10)-2.5+2.5dB
Mute and Standby Mode GainAMUTE(Note 5)-90dBtand b y M od e E xi t Ti m etPU(Note 6)10µs2C AC ELECTRICAL CHARACTERISTICS (See Figure 3)
(VCC= +4.5V to +5.5V, TA= -20°C to +70°C, timing referenced to VIL(MAX)and VIH(MIN), unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SCL Clock FrequencyfSCL(Note 7)0400kHz
Bus Free Time Between STOP and
START ConditionstBUF1.3µs
Hold Time (Repeated) START
ConditiontHD:STA0.6µs
Low Period of SCLtLOW1.3µs
High Period of SCLtHIGH0.6µs
Data Hold TimetHD:DAT00.9µs
Data Setup TimetSU:DAT100ns
Start Setup TimetSU:STA0.6µs
SDA and SCL Rise TimetR(Note 8)20 +
0.1CB300ns
SDA and SCL Fall TimetF(Note 8)20 +
0.1CB300ns
STOP Setup TimetSU:STO0.6µs
SDA and SCL Capacitive LoadingCB(Note 8)400pF
DS44202C Programmable-Gain Amplifier
for Audio Applications
Note 1:All voltages are referenced to ground. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Note 2:Standby supply current specified with SDA = SCL = VCC, the output disconnected, and A0, A1, and A2 driven to within
100mV of VCCor GND.
Note 3:Input resistance during mute and power-down is approximately one-half of the active-mode resistance.
Note 4:Each output is capable of driving a 100nF capacitive load to ground using an external 10Ω series resistor. However, output
capacitance should be minimal for optimal distortion performance.
Note 5:Guaranteed by design.
Note 6:This is the time it takes for the output to become active after exiting standby mode.
Note 7:I2C interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I2C standard-
mode timing.
Note 8:CB= total capacitance of one bus line in picofarads.
Note 9:The current specified is the sum of VCC and AVCCsupply currents.
Note 10:Gain accuracy specified assuming the output impedance of signal source driving of the DS4420 is ≤ 2.5kΩ.
Typical Operating Characteristics
(TA= +25°C, VCC = AVCC= 5.0V, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(STANDBY MODE ENABLED)
DS4420 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
VCC = AVCC = SDA = SCL
NO LOAD
IN+ AND IN- SHORTED
TOGETHER
+25°C
+70°C
-20°C
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(SETTING AT -11dB)
DS4420 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
VCC = AVCC = SDA = SCL
NO LOAD
IN+ AND IN- SHORTED
TOGETHER+25°C-20°C
+70°C
SUPPLY CURRENT vs. GAIN SETTING
DS4420 toc03
GAIN SETTING
SUPPLY CURRENT (mA)
IN+ AND IN- SHORTED
TOGETHER
NO LOAD
DS44202C Programmable-Gain Amplifier
for Audio Applications
POWER-SUPPLY REJECTION RATIO
vs. GAIN SETTING
DS4420 toc04
GAIN SETTING
PSRR (dB)
1kHz
50Ω LOAD
20kHz
50Ω LOAD
100010,000100,000
COMMON-MODE FREQUENCY RESPONSE
SWEEP AT -11dB
DS4420 toc05
FREQUENCY (Hz)
CMRR (dB)
NO LOAD
1000100,0001,000,000
GAIN vs. FREQUENCY RESPONSE
DS4420 toc06
FREQUENCY (Hz)
GAIN (dB)
10,000
50Ω LOAD
-2dB SETTING
-35dB SETTING
+25dB SETTING
GAIN vs. SETTING
DS4420 toc07
GAIN SETTING
GAIN (dB)5101520
IN+ AND IN- SHORTED TOGETHER
ACROSS -20°C TO +70°C
WITH 50Ω LOAD, 1kΩ LOAD,
AND NO LOAD
CCITT NOISE vs. GAIN SETTING
DS4420 toc08
GAIN SETTING
CCITT NOISE (dBV)5101520
NO LOAD0.018
0.000100010010,000100,000
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
DS4420 toc09
FREQUENCY (Hz)
THD+N (%)0.008
WITH 50Ω LOAD
AND 1kΩ LOAD
1VRMS INPUT
-11dB SETTING
0.00100010010,000100,000
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
DS4420 toc10
FREQUENCY (Hz)
THD+N (%)0.04
WITH 50Ω LOAD
AND 1kΩ LOAD
1VRMS INPUT
+10dB SETTING
TOTAL HARMONIC DISTORTION vs. VOUT
DS4420 toc11
GAIN SETTING
OUT
(dB)
THD+N (%)
50Ω LOAD
1kHz 2VRMS
INPUTVOUT
THD+N
Typical Operating Characteristics (continued)
(TA= +25°C, VCC = AVCC= 5.0V, unless otherwise noted.)
DS44202C Programmable-Gain Amplifier
for Audio Applications
Detailed Description
The key features of the DS4420 are illustrated in the
Block Diagram.
Controlling the DS4420
The DS4420 is controlled through the I2C serial inter-
face. Gain, mute, and standby settings all reside in one
control register located at memory address F8h (see
Figure 1). Writes to other memory addresses are invalid.
Programmable Gain
The gain is adjustable from -35dB to +25dB in 3dB
increments. The gain is determined by the five LSBs of
the control register as shown in Figure 1. Gain settings
greater than 14h are invalid.
Mute Mode
The DS4420 is placed in mute mode by setting the mute
bit located in the control register (see Figure 1). When in
this mode, the output of the amplifier is muted and is
independent of the gain setting. The input-to-output
attenuation is specified in the Electrical Characteristics
table as AMUTE.
Standby Mode
Standby mode is entered by setting the standby control
bit (see Figure 1). Setting the standby control bit mutes
the output of the amplifier and places the DS4420 into a
low-current (ISTBY) consumption state. Unlike mute
mode, however, standby mode is intended for use when
no input signal is present. While in standby mode, the
DS4420 maintains input and output common-mode bias
voltages. The device produces no audible clicks or
pops when entering or exiting the standby state. The
time required for the output to become active when
exiting standby mode is specified as tPU.
Pin Description
PINNAMEFUNCTION
1A2
2A1
3A0
Address Select Inputs—Determine I2C Slave Address. Device address is 1010A2A1A0.SCLI2C Serial Clock—Input for I2C ClockSDAI2C Serial Data—Input/Output for I2C Data
6VCCDigital Power-Supply TerminalGNDGroundIN+IN-Differential Audio Input SignalN.C.No ConnectionAGNDAnalog Ground (Must be Connected to GND)OUT-OUT+Differential Audio Output SignalAVCCAnalog Power Supply (Must be Connected to VCC)EPExposed Paddle. Connect to GND and AGND.
Block Diagram
DS4420
3dB
GAIN
STEPS
AVCC
AGNDGND
VCCA2A1A0
SDA
SCL
IN+
IN-
OUT+
OUT-2C INTERFACE
-35dB
TO +25dB
GAIN

Partno	Mfg	Dc	Qty	Available	Descript
DS4420N+ \|DS4420N	DALLAS	N/a	2	avai	I²C Programmable Gain Amplifier for Audio Applications