Datasheet

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 I
2
C 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 I
2
C 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
Features
 Differential Inputs and Outputs
 -35dB to +25dB Adjustable Gain
 Low Output Noise
 Low-Distortion Driving into a 50Ω Load
 3dB Gain Steps Programmed through I
2
C Interface
 5V Single Supply
 20kHz Bandwidth for All Gain Settings
 Small 3mm x 3mm x 0.8mm TDFN Package
 Up to Eight DS4420s can be Placed on the Same
I
2
C Bus
DS4420
I
2
C Programmable-Gain Amplifier
for Audio Applications
______________________________________________ Maxim Integrated Products 1
Rev 0; 9/06
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
DS4420+ -20°C to +70°C 14 TDFN-EP*
+ Denotes lead-free package.
* EP = Exposed paddle.
DS4420
-35dB
TO +25dB
GAIN
A2
A1
A0
SDA
SCL
IN+
OUT+
OUT-
IN-
GND
V
CC
AGND
AV
CC
AUDIO
AMPLIFIER
AUDIO
SOURCE
MICROPR0CESSOR-
CONTROLLED GAIN
I
2
C INTERFACE
Typical Operating Circuit
TDFN
(3mm x 3mm x 0.8mm)
TOP VIEW
2
4
5
13
11
10
OUT+
AGND
N.C.
A1
SCL
SDA
1
+
14
AV
CC
OUT-
A2
3
12
A0
6
9
IN-V
CC
7
8
IN+GND
DS4420
Pin Configuration