CS5534-BSZR【PDF 1/17 页】IC ADC 24BIT 4CH W/LNA 24SSOP

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Cirrus Logic, Inc. 2008

http://www.cirrus.com

CS5532/34-BS

24-bit

Σ ADCs with Ultra-low-noise PGIA

Features

Chopper-stabilized PGIA (Programmable

Gain Instrumentation Amplifier, 1x to 64x)

– 6 nV/

√Hz @ 0.1 Hz (No 1/f noise) at 64x

– 1200 pA Input Current with Gains >1

Delta-sigma Analog-to-digital Converter

– Linearity Error: 0.0007% FS

– Noise-free Resolution: Up to 23 bits

Two- or Four-channel Differential MUX

Scalable Input Span via Calibration

– ±5 mV to differential ±2.5V

Scalable VREF Input: Up to Analog Supply

Simple Three-wire Serial Interface

– SPI and Microwire Compatible

– Schmitt Trigger on Serial Clock (SCLK)

R/W Calibration Registers Per Channel

Selectable Word Rates: 6.25 to 3,840 Sps

Selectable 50 or 60 Hz Rejection

Power Supply Configurations

– VA+ = +5 V; VA- = 0 V; VD+ = +3 V to +5 V

– VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V to +5 V

– VA+ = +3 V; VA- = -3 V; VD+ = +3 V

General Description

The CS5532/34 are highly integrated

Σ Analog-to-Digi-

tal Converters (ADCs) which use charge-balance

techniques to achieve 24-bit performance. The ADCs

are optimized for measuring low-level unipolar or bipolar

signals in weigh scale, process control, scientific, and

medical applications.

To accommodate these applications, the ADCs come as

either two-channel (CS5532) or four-channel (CS5534)

devices and include a very low-noise, chopper-stabilized

instrumentation amplifier (6 nV/

√Hz @ 0.1 Hz) with se-

lectable gains of 1×, 2×, 4×, 8×, 16×, 32×, and 64×.

These ADCs also include a fourth-order

Σ modulator

followed by a digital filter which provides twenty selectable

output word rates of 6.25, 7.5, 12.5, 15, 25, 30, 50, 60, 100,

120, 200, 240, 400, 480, 800, 960, 1600, 1920, 3200, and

3840 Sps (MCLK = 4.9152 MHz).

To ease communication between the ADCs and a micro-

controller, the converters include a simple three-wire se-

rial interface which is SPI and Microwire compatible

with a Schmitt-trigger input on the serial clock (SCLK).

High dynamic range, programmable output rates, and

flexible power supply options makes these ADCs ideal

solutions

for

weigh

scale

and

process

control

applications.

ORDERING INFORMATION

See page 47

VA+

VREF+

VREF-

VD+

DIFFERENTIAL

4TH ORDER

MODULATOR

PGIA

1,2,4,8,16

PROGRAMMABLE

SINC FIR FILTER

MUX

(CS5534

SHOWN)

AIN1+

AIN1-

AIN2+

AIN2-

AIN3+

AIN3-

AIN4+

AIN4-

SERIAL

INTERFACE

LATCH

CLOCK

GENERATOR

CALIBRATION

SRAM/CONTROL

LOGIC

DGND

SDI

SDO

SCLK

OSC2

OSC1

A0/GUARD

VA-

32,64

OCT ‘08

DS755F3

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