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Cirrus Logic CS5372A User Manual

Low-power, high-performance, Modulators, Features

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Copyright

Cirrus Logic, Inc. 2010

(All Rights Reserved)

http://www.cirrus.com

CS5371A
CS5372A

Low-power, High-performance

ΔΣ

Modulators

Features

Fourth-order

ΔΣ Architecture

Clock-jitter-tolerant Architecture

Input Voltage: 5 V

pp

Fully Differential

Input Signal Bandwidth: DC to 2 kHz

High Dynamic Range

• 127 dB SNR @ 215 Hz BW (2 ms sampling)

• 124 dB SNR @ 430 Hz BW (1 ms sampling)

Low Total Harmonic Distortion

• -118 dB THD typical (0.000126%)

Low Power Consumption

• Normal operation: 25 mW per channel

• Power down: 10 µW per channel

Small Footprint, 24-pin SSOP package

Multi-channel System Support

• 1-channel System: CS5371A

• 2-channel System: CS5372A

• 3-channel System: CS5371A + CS5372A

• 4-channel System: CS5372A + CS5372A

Bipolar Power Supply Configuration

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

Description

The CS5371A and CS5372A are one- and two-channel,
high-dynamic-range, fourth-order

ΔΣ modulators intend-

ed for geophysical and sonar applications. When
combined with CS3301A / CS3302A differential amplifi-
ers, the CS4373A test DAC and CS5376A digital filter, a
small, low-power, self-testing, high-accuracy, multi-
channel measurement system results.

The modulators have high dynamic range and low total
harmonic distortion with very low power consumption.
They convert differential analog input signals from the
CS3301A / CS3302A amplifiers to an oversampled seri-
al bit stream at 512 kbits per second. This oversampled
bit stream is then decimated by the CS5376A digital filter
to a 24-bit output at the selected output word rate.

In normal operation, power consumption is 5 mA per
channel. Each modulator can be independently powered
down to 500 µA per channel, and by halting the input
clock they will enter a micro-power state using only 2 µA
per channel.

The CS5371A and CS5372A modulators are available in
small 24-pin SSOP packages, providing exceptional per-
formance in a very small footprint.

ORDERING INFORMATION

See

page 30

.

Clock

Generator

INF1+

VREF+
VREF-

VA+

VA-

VD

GND

PWDN1

MFLAG1

MDATA1

MCLK
MSYNC

MFLAG2

MDATA2

PWDN2

INF1-
INR1-

INR1+

INF2+
INF2-
INR2-

INR2+

4th Order

ΔΣ Modulator

4th Order

ΔΣ Modulator

OFST

CS5372A

Clock

Generator

INF+

VREF+
VREF-

VA+

VA-

VD

GND

PWDN

MFLAG

MDATA

MCLK
MSYNC

INF-
INR-

INR+

4th Order

ΔΣ Modulator

OFST

CS5371A

SEP ‘10

DS748F3

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