CS5371 datasheet(7/22 Pages) CIRRUS

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CS5371 CS5372

DS255F3

2. GENERAL DESCRIPTION.

The CS5371 and CS5372 are one- and two- chan-

nel fourth-order

∆Σ modulators, optimized for ex-

tremely high-resolution measurement of signals

between DC and 1600 Hz. They are designed to

be used with the CS5376A and CS5378 low-power

digital filters. Figure 3 on page 8 shows a four-

channel system connection diagram for two

CS5372 and one CS5376A.

High Performance

The CS5371/72 modulators have exceptional per-

formance characteristics.

Modulator dynamic

range (SNR) is 127 dB over a 215 Hz bandwidth

(2 ms sampling), with total harmonic distortion

(THD) of -118 dB.

Low Power Consumption

The CS5371/72 modulators have very low power

consumption. Power consumption is only 25 mW

per

channel

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 CS5371/72 modulators are available in a very

small

24-pin

SSOP

package

approximately

8 mm x 8 mm in size. The CS5372 has two mod-

ulator channels per package to increase board lay-

out density even further.

Multi-channel System Support

Combining the CS5371 and CS5372 modulators

with a digital filter permits multiple system configu-

rations:

1 Channel - CS5371, CS5378

2 Channel - CS5372, CS5376A

3 Channel - CS5371, CS5372, CS5376A

4 Channel - CS5372, CS5372, CS5376A

Differential Analog Signal Inputs

The CS5371/72 modulators have fully differential

analog inputs capable of measuring signals up to

5.0 V peak-to-peak when using a 2.5 V voltage ref-

erence. The inputs will tolerate a 5% over-range

voltage and continue operating at full specification.

Digital Filter Interface

The CS5371/72 modulators are designed to oper-

ate with the CS5376A and CS5378 digital filters.

The digital filter generates the modulator clock and

synchronization

signal

inputs

(MCLK

and

MSYNC), while receiving 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 modulator clock.

Multiple Power Supply Configurations

The CS5371/72 modulators support flexible power

supply configurations. They can run from single or

dual supplies in the following configurations:

VA+ = +5V; VA- = 0V;

VD = +3.3V to +5V

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

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