Preliminary Product Information

This document contains information for a new product.

Cirrus Logic reserves the right to modify this product without notice.

1

Copyright

 Cirrus Logic, Inc. 2003

(All Rights Reserved)

Cirrus Logic, Inc.

www.cirrus.com

CS3302

High-Z Programmable Gain Differential Amplifier

Features

Signal bandwidth: DC to 2 kHz

Selectable gain: x1, x2, x4, x8, x16, x32, x64

Differential inputs, differential outputs

• Multiplexed inputs: INA, INB, 800

Ω termination

• Rough / fine charge outputs for CS5371/72

• Ultra-low input bias: < 1 pA

Excellent noise performance

•1

µV

Low total harmonic distortion

• -118 dB THD typical (0.000126%)

• -112 dB THD maximum (0.000251%)

Low power consumption

• Normal / LPWR / PWDN: 5 mA, 3.3 mA, 10

µA

Single or dual power supply configurations

• VA+ = +5 V; VA- = 0 V;

VD = +3.3 V to +5 V

• VA+ = +2.5 V;VA- = -2.5 V;VD = +3.3 V

Description

The CS3302 is a high input impedance differential in, dif-

ferential out amplifier with programmable gain, optimized

for amplifying signals from high impedance sensors such

as hydrophones. The gain settings are binary weighted

(x1, x2, x4, x8, x16, x32, x64) and are selected using

simple pin settings. Two sets of external inputs, INA and

INB, simplify system design as inputs from a sensor and

test DAC. An internal 800

Ω termination can also be se-

lected for noise tests.

Amplifier input impedance is very high, requiring less

than 1 pA of input current. Noise performance is very

good at 1

density of 8.5 nV/

√Hz over the 200 Hz to 2 kHz band-

width. Distortion performance is also extremely good,

typically -118 dB THD. Low input current, low noise, and

low total harmonic distortion make this amplifier ideal for

high impedance differential sensors requiring maximum

dynamic range.

ORDERING INFORMATION

CS3302-IS

-40ºC to +85ºC

24-pin SSOP

INA+

INB+

MUX0

MUX1

INB-

INA-

VA+

VA-

VD

DGND

GUARD

OUTR+

OUTF+

GAIN0

GAIN1

GAIN2

OUTF-

OUTR-

LPWR

PWDN

+

-

-

+

500

Ω

500

Ω

500

Ω

500

Ω

750

750

750

750

JUN ‘03

DS596PP2