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PDF DS4420 Data sheet ( Hoja de datos )
| Número de pieza | DS4420 | |
| Descripción | I2C Programmable Gain Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 0; 9/06
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
Pin Configuration
TOP VIEW
A2 1
A1 2
A0 3
SCL 4
SDA 5
VCC 6
GND 7
DS4420
14 AVCC
13 OUT+
12 OUT-
11 AGND
10 N.C.
9 IN-
8 IN+
TDFN
(3mm x 3mm x 0.8mm)
Features
o Differential Inputs and Outputs
o -35dB to +25dB Adjustable Gain
o Low Output Noise
o Low-Distortion Driving into a 50Ω Load
o 3dB Gain Steps Programmed through I2C Interface
o 5V Single Supply
o 20kHz Bandwidth for All Gain Settings
o Small 3mm x 3mm x 0.8mm TDFN Package
o Up to Eight DS4420s can be Placed on the Same
I2C Bus
Ordering Information
PART
DS4420+
TEMP RANGE
-20°C to +70°C
+Denotes lead-free package.
*EP = Exposed paddle.
PIN-PACKAGE
14 TDFN-EP*
Typical Operating Circuit
MICROPR0CESSOR-
CONTROLLED GAIN
AUDIO
SOURCE
VCC GND AGND AVCC
SDA
SCL
A2 I2C INTERFACE
A1
A0
OUT+
IN+
-35dB
IN-
TO +25dB
GAIN
OUT-
DS4420
AUDIO
AMPLIFIER
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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I2C Programmable-Gain Amplifier
for Audio Applications
Typical Operating Characteristics (continued)
(TA = +25°C, VCC = AVCC = 5.0V, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. GAIN SETTING
120
100 1kHz
50Ω LOAD
80
60
20kHz
40 50Ω LOAD
20
0
0 5 10 15 20
GAIN SETTING
COMMON-MODE FREQUENCY RESPONSE
SWEEP AT -11dB
0
NO LOAD
-10
-20
-30
-40
-50
-60
-70
-80
1000
10,000
FREQUENCY (Hz)
100,000
GAIN vs. FREQUENCY RESPONSE
30
50Ω LOAD
20 +25dB SETTING
10
0
-2dB SETTING
-10
-20
-30
-40
1000
-35dB SETTING
10,000
100,000
FREQUENCY (Hz)
1,000,000
GAIN vs. SETTING
30
IN+ AND IN- SHORTED TOGETHER
20
ACROSS -20°C TO +70°C
WITH 50Ω LOAD, 1kΩ LOAD,
AND NO LOAD
10
0
CCITT NOISE vs. GAIN SETTING
0
NO LOAD
-20
-40
-60
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
0.018
0.016
0.014
WITH 50Ω LOAD
AND 1kΩ LOAD
1VRMS INPUT
-11dB SETTING
0.012
0.010
-10 -80 0.008
0.006
-20 -100
0.004
-30 -120 0.002
-40
0
5 10 15
GAIN SETTING
20
-140
0
5 10 15
GAIN SETTING
0.000
20 10 100 1000 10,000 100,000
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
0.09
WITH 50Ω LOAD
0.08 AND 1kΩ LOAD
0.07
1VRMS INPUT
+10dB SETTING
0.06
0.05
0.04
0.03
0.02
0.01
0.00
10
100 1000 10,000 100,000
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION vs. VOUT
DS4420 toc11
10 0.020
50Ω LOAD
5 1kHz 2VRMS
VOUT
0.018
0 INPUT
0.016
-5 0.014
-10 0.012
-15 0.010
-20 0.008
-25 0.006
-30 0.004
-35
THD+N
0.002
-40 0.000
2 4 6 8 10 12 14 16 18 20
GAIN SETTING
_____________________________________________________________________ 5
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