CS5374 datasheet(14/44 Pages) CIRRUS

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CS5374

DS862F1

GENERAL DESCRIPTION

The CS5374 combines two marine seismic analog

measurement channels into one 7 mm x 7 mm QFN

package. Each measurement channel consists of a

high input impedance programmable gain differen-

tial amplifier that buffers analog signals into a

high-performance, fourth-order

ΔΣ modulator. The

low-noise

ΔΣ modulator converts the analog signal

into a one-bit serial bit stream suitable for the

CS5376A digital filter.

Each amplifier has two sets of external inputs, INA

and INB, to simplify system design as inputs from

a hydrophone sensor or the CS4373A test DAC. An

internal 800

Ω termination can also be selected for

noise tests. Gain settings are binary weighted (1x,

2x, 4x, 8x, 16x, 32x, 64x) and match the CS4373A

test DAC output attenuation settings for full-scale

testing at all gain ranges. Both the input multiplex-

er and gain are set by registers accessed through a

standard SPI™ port.

Each fourth-order

ΔΣ modulator has very high dy-

namic range combined with low total harmonic dis-

tortion and low power consumption. It converts

differential analog signals from the amplifier to an

oversampled

ΔΣ serial bit stream which is decimat-

ed by the CS5376A digital filter to a 24-bit output

at the final output word rate.

Figure 10 shows the system-level architecture of a

4-channel acquisition system using two CS5374,

one CS5376A digital filter and one CS4373A test

DAC.

Figure 11 and Figure 12 shows connection dia-

grams for the CS5374 device when connected to

the CS5376A digital filter.

Hydrophone

Sensor

Hydrophone

Sensor

Hydrophone

Sensor

Hydrophone

Sensor

Modulator

Digital Filter

CS5376A

Test

DAC

Microcontroller

Configuration

EEPROM

System

Telemetry

AMP

CS4373A

CS5374

Modulator

AMP

Modulator

AMP

CS5374

Modulator

AMP

Figure 10. CS5374 System Block Diagram

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