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CS5372-BS

Low-Power High-Performance ∆Σ Modulators

Cirrus Logic 

CS5371/CS5372

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

DS255PP2

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