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Cirrus Logic CS3301A User Manual

Cs3301a, Features & desription, Description

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Copyright

© Cirrus Logic, Inc. 2007

(All Rights Reserved)

http://www.cirrus.com

CS3301A

Low-noise, Programmable Gain, Differential Amplifier

Features

& Desription

z

Signal Bandwidth:

DC to 2 kHz

z

Selectable Gain:

x1, x2, x4, x8, x16, x32, x64

z

Differential Inputs, Differential Outputs

• Multiplexed inputs: INA, INB, 800

Ω termination

• Rough / fine outputs for CS5371A / 72A / 73A
• Max signal amplitude: 5 V

pp

differential

• Low input bias: 1 nA typical

z

Outstanding Noise Performance

• 8.5

from 0.1 Hz to 2 kHz

• 0.180

µV

p-p

between 0.1 Hz and 10 Hz

z

Low Total Harmonic Distortion

• -121 dB THD typical (0.0000891%)
• -112 dB THD maximum (0.0002512%)

z

Low Power Consumption

• Normal operation: 5.5 mA typical
• Power down: 10

µA typical

z

Small 24-pin SSOP Package

z

Bipolar Power Supply Configuration

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

Description

The CS3301A is a low-noise differential input, dif-
ferential output amplifier with programmable gain,
optimized for amplifying signals from low-imped-
ance sensors such as geophones. The gain
settings are binary weighted (x1, x2, x4, x8, x16,
x32, x64) and are selected using simple pin set-
tings. 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 bandwidth. Distortion performance is also ex-
tremely good, typically -121 dB THD at x1 gain. Flat
noise down to 0.1 Hz and low total harmonic distor-
tion make this amplifier ideal for low-frequency,
low-amplitude, differential signals requiring maxi-
mum dynamic range.

ORDERING INFORMATION

See

page 15

.

nV/ Hz

nV/ Hz

INA+
INB+

MUX0
MUX1

INB-

INA-

VA+

VA-

VD

GND

CLK

OUTR+
OUTF+

GAIN0
GAIN1
GAIN2

OUTF-
OUTR-

PWDN

+

-

-

+

40

0

40

0

MAR ‘07

DS757F1