CS5376A datasheet(19/107 Pages) CIRRUS

19 / 107 page

CS5376A

3. SYSTEM DESIGN WITH CS5376A

Figure 9 illustrates a simplified block diagram of

the CS5376A in a multi-channel measurement sys-

tem.

Up to four differential sensors are connected

through CS3301/02 differential amplifiers to the

CS5371/72

∆Σ modulators, where analog to digital

conversion occurs. Each modulators 1-bit output

connects to a CS5376A MDATA input, where the

oversampled

∆Σ data is decimated and filtered to

24-bit output samples at a programmed output rate.

These output samples are buffered in an 8-deep

data FIFO and passed to the system telemetry on

command.

System self tests are performed by connecting the

CS5376A test bit stream (TBS) generator to the

CS4373 test DAC. Analog tests drive differential

signals from the CS4373 test DAC into the multi-

plexed inputs of the CS3301/02 amplifiers or di-

rectly to the sensors through external analog

switches. Digital loopback tests internally connect

the TBS digital output directly to the CS5376A

modulator inputs.

3.1 Power Supplies

The multi-channel system shown in Figure 9 typi-

cally operates from a ±2.5 V or 5 V analog power

supply and a 3.3 V digital power supply. The

CS5376A logic core can be powered from 3 V to

minimize power consumption, if required.

3.2 Reset Control

System reset is required only for the CS5376A de-

vice, and is a standard active low signal that can be

generated by a power supply monitor or microcon-

troller. Other system devices default to a power-

down state when the CS5376A is reset.

Figure 9. Multi-Channel System Block Diagram

∆Σ

Modulator

∆Σ

Modulator

Digital Filter

AMP

Geophone

Hydrophone

Sensor

Geophone

Hydrophone

Sensor

Geophone

Hydrophone

Sensor

Geophone

Hydrophone

Sensor

Test

DAC

µController

Configuration

EEPROM

Communication

Interface

CS3301

CS3302

CS5371

CS5376A

CS4373

System Telemetry

CS3301

CS3302

CS3301

CS3302

CS3301

CS3302

CS5372

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