CS5321 datasheet(16/36 Pages) CIRRUS

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CS5321/22

DS454F2

2. GENERAL DESCRIPTION

The CS5321 is a fourth-order CMOS monolithic

analog modulator designed specifically for very

high resolution measurement of signals between dc

and 1600 Hz. Configuring the CS5321 with the

CS5322 FIR filter results in a high resolution A/D

converter system that performs sampling and A/D

conversion with a dynamic range exceeding 120

dB.

The CS5321 uses a fourth-order oversampling ar-

chitecture to achieve high resolution A/D conver-

sion. The modulator consists of a 1-bit A/D

converter embedded in a negative feedback loop.

The modulator provides an oversampled serial bit

stream at 256 kbits per second (HBR=1) and 128

kbits per second (HBR=0) operating with a clock

rate of 1.024 MHz. Figure 18 illustrates the

CS5321 block diagram.

The CS5322 is a monolithic digital Finite Impulse

Response (FIR) filter with programmable decima-

tion. The CS5322 and CS5321 are intended to be

used together to form a unique high dynamic range

ADC chipset. The CS5322 provides the digital

anti-alias filter for the CS5321 modulator output.

The CS5322 consists of: a multi-stage FIR filter,

four registers (status, data, offset, and configura-

tion), a flexible serial input and output port, and a

2-channel input data multiplexer that selects data

from the CS5321 (MDATA) or user test data

(TDATA). The CS5322 decimates (64x to 4096x)

the output to any of seven selectable up-date peri-

ods: 16, 8, 4, 2, 1, 0.5 and 0.25 milliseconds. Data

is output from the digital filter in a 24-bit serial for-

mat. Figure 19 illustrates the CS5322 Block Dia-

gram.

Figure 18. CS5321 Block Diagram

AINR

Vdd1

Osc.

Detect

AIN+

AIN-

VREF+

VREF-

D/A

A/D

Digital

Control

MDATA

Clock

Generation

MSYNC

MCLK

HBR

MFLG

OFST

LPWR

Vss1

AGND

Vdd2

Vss2

DGND

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