Copyright

© Cirrus Logic, Inc. 2005

(All Rights Reserved)

http://www.cirrus.com

CS3301

Low-noise, Programmable Gain, Differential Amplifier

Differential Inputs, Differential Outputs

• Multiplexed inputs: INA, INB, 800

Ω termination

• Rough / fine charge outputs for CS5371/72

• Low input bias: 500 pA

Outstanding Noise Performance

•0.20

• 8.5

from 0.1 Hz to 2 kHz

Low Total Harmonic Distortion

• -118 dB THD typical (0.000126%)

• -112 dB THD maximum (0.000251%)

Low Power Consumption

• Normal/LPWR/PWDN: 5.5 mA, 3.5 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 CS3301 is a low-noise differential input, differential

output amplifier with programmable gain, optimized for

amplifying signals from low-impedance sensors such as

geophones. 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 selected

for noise tests.

Amplifier noise performance is outstanding with a noise

density of 8.5

over the 0.1 Hz to 2 kHz band-

width. Distortion performance is also extremely good,

typically -118 dB THD. Flat noise down to 0.1 Hz and

low total harmonic distortion make this amplifier ideal for

low-frequency, low-amplitude, differential signals requir-

ing maximum dynamic range.

ORDERING INFORMATION

See page 15.

nV/ Hz

nV/ Hz

INA+

INB+

MUX0

MUX1

INB-

INA-

VA+

VA-

VD

DGND

CLK

OUTR+

OUTF+

GAIN0

GAIN1

GAIN2

OUTF-

OUTR-

LPWR

PWDN

+

-

-

+

500

Ω

500

Ω

500

Ω

500

Ω

SEP ‘05

DS595F2

680

680

680

680