CS5371A_09 Datasheet, PDF (1/32 Pages) Cirrus Logic – Low-power, High-performance ΔΣ Modulators

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 31.
VA+
PWDN
INR+
INF+
INF-
INR-
VREF+
VREF-
4th Order
ΔΣ Modulator
CS5371A
VA-
OFST
VD
VA+
PWDN1
MFLAG
MDATA
Clock
Generator
MCLK
MSYNC
INR1+
INF1+
INF1-
INR1-
VREF+
VREF-
INR2+
INF2+
INF2-
INR2-
4th Order
ΔΣ Modulator
4th Order
ΔΣ Modulator
GND
VA-
PWDN2 OFST
VD
MFLAG1
MDATA1
Clock
Generator
MCLK
MSYNC
MFLAG2
MDATA2
CS5372A
GND
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SEP ‘09
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