CS5504 Datasheet, PDF (1/24 Pages) Cirrus Logic – Low Power, 20-Bit A/D Converter

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Features
l Delta-sigma A/D Converter
- 20-bit, No Missing Codes
- Linearity Error: ±0.0007%FS
l 2 Differential Inputs
- Pin-selectable Unipolar/Bipolar Ranges
- Common Mode Rejection
105 dB @ dc
120 dB @ 50, 60 Hz
l Either 5V or 3.3V Digital Interface
l On-chip Self-calibration Circuitry
l Output Update Rates up to 200/Sps
l Low Power Consumption: 4.4 mW
Description
The CS5504 is a 2-channel, fully differential 20-bit, seri-
al-output CMOS A/D converter. The CS5504 uses
charge-balanced (delta-sigma) techniques to provide a
low cost, high-resolution measurement at output word
rates up to 200 samples per second.
The on-chip digital filter offers superior line rejection at
50 Hz and 60 Hz when the device is operated from a
32.768 kHz clock (output word rate = 20 Sps).
The CS5504 has on-chip self-calibration circuitry which
can be initiated at any time or temperature to ensure
minimum offset and full-scale errors.
Low power, high-resolution and small package size
make the CS5504 an ideal solution for loop-powered
transmitters, panel meters, weigh scales and battery-
powered instruments.
ORDERING INFORMATION
See page 23.
CS5504-BS -40° to +85° C 20-pin SOIC
I
VREF+
12
VREF-
13
VA+ VA- DGND VD+
14 15
16 17
8
AIN1+
10
AIN1-
9
MUX
AIN2+
11
AIN2-
4th-Order
Delta-Sigma
Modulator
Digital
Filter
Serial
Interface
Logic
2
CS
18 _SCLK
19
SDATA
20
DRDY
A0 ¹
Calibration SRAM
Calibration µC
OSC
3
5
6
CONV XIN XOUT
4 _CAL
7 _BP/UP
Cirrus Logic, Inc.
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[phone] FAX: [phone]
http://www.crystal.com
Copyright © CirrCuospLyoriggich,t I©ncC. i2rr0u0s5Logic, Inc. 1997
(All Rights Rese(rAvell dR)ights Reserved)
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