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CS5372 Datasheet(PDF) 7 Page - Cirrus Logic

Part # CS5372
Description  LOW POWER HIGH PERFORMANCE MODULATORS
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5372 Datasheet(HTML) 7 Page - Cirrus Logic

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CS5371/CS5372
DS255PP2
7
2. GENERAL DESCRIPTION.
The CS5371 and CS5372 are one and two channel
fourth-order
∆−Σ modulators, optimized for ex-
tremely high resolution measurement of signals be-
tween DC and 1644 Hz. They are designed to be
used with the CS5376 low power multi-channel
decimation filter. Figure 3 on page 8 shows a four-
channel system connection diagram for two
CS5372 and one CS5376.
High Performance
The CS5371/CS5372 modulators have exceptional
performance characteristics. Modulator dynamic
range (SNR) is 124 dB over a 411 Hz bandwidth,
with total harmonic distortion (THD) of -118 dB.
Low Power Consumption
The CS5371/CS5372 modulators have very low
power consumption. Power consumption is only
25 mW per channel in normal mode (LPWR=0,
MCLK=2.048 MHz), and 15 mW per channel in
low power mode (LPWR=1, MCLK=1.024 MHz).
An independently selectable power-down mode
(PWDN=1) can be used to disable a modulator and
reduces its power consumption to 1 mW. If MCLK
is then halted (MCLK=0), the modulator enters a
micropower state using only 10 µW per channel.
Small Package Size
The CS5371/CS5372 modulators are available in a
very small 24-pin SSOP package approximately
8 mm x 8 mm in size. The CS5372 has two modu-
lator channels per package to increase board layout
density even further.
Multi-Channel System Support
Combining the CS5371 and CS5372 modulators
with the CS5376 digital filter permits multiple
channel system configurations to be supported.
1 Channel - CS5371, CS5376
2 Channel - CS5372, CS5376
3 Channel - CS5371, CS5372, CS5376
4 Channel - CS5372, CS5372, CS5376
Differential Analog Signal Inputs
The CS5371/CS5372 modulators have differential
analog inputs capable of measuring signals up to
5.0 V peak-to-peak (2.5 V fully differential) when
using a 2.5 V voltage reference. The inputs will
tolerate a 5% over-range voltage and continue op-
erating at full specification.
Digital Filter Interface
The CS5371/CS5372 modulators are designed to
operate with the CS5376 digital filter. The CS5376
generates the modulator clock and synchronization
signal inputs (MCLK and MSYNC), while receiv-
ing the modulator data and over-range flag outputs
(MDATA and MFLAG). The modulators produce
an oversampled
∆−Σ serial bit stream at 512 kbits
per second when operated from a 2.048 MHz mod-
ulator clock.
Multiple Power Supply Configurations
The CS5371/CS5372 modulators support multiple
power supply configurations. They can run from
single or dual supplies in the following configura-
tions:
s VA+ = +5V;
VA- = 0V;
VD = +3V to +5V
s VA+ = +2.5V; VA- = -2.5V; VD = +3V to +5V
s VA+ = +3V;
VA- = -3V;
VD = +3V


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