CS5540 Datasheet, PDF (1/22 Pages) Cirrus Logic – LOW POWER LOW VOLTAGE 24- BIT ACD

CS5540
Low-Power, Low-Voltage, 24 - Bit ∆Σ ADC
Features
l ∆Σ Analog-to-Digital Converter
- Linearity Error: 0.0015% FS
- RMS Noise: 4 µV
l Two Channel Differential MUX
l Buffered, Fully Differential Analog and
Voltage Reference Inputs
l Scalable V_REF Input: 0.1 V to Analog Supply
l High Absolute Accuracy via Self-Calibration
l Fixed Digital Filter
- Single Conversion Settling at 6.7 SPS
- Simultaneous 50/60 Hz Rejection
l Simple Serial Interface
- SPI^TM and Microwire^TM Compatible
- Schmitt Trigger on Serial Clock (SCLK)
l Low Power
- Single +3.0 V Supply
- 330 µA Supply Current
- 10 µA in Sleep Mode
Description
The CS5540 is a low-power and low-voltage ∆Σ ana-
log-to-digital converter (ADC), which achieves highly
accurate conversions using a simple non-programmable
interface that is easy to understand and design-in. It is
optimized to convert analog signals in DC measurement
applications, such as temperature and pressure mea-
surement, and various portable devices where
low-power consumption is required.
To accommodate these applications, the ADC integrates
analog input and reference buffers for increased input
impedance and a two-channel multiplexer.
The CS5540 includes a digital filter, which achieves si-
multaneous rejection of 50/60 Hz signals and provides
single conversion settling at 6.7 SPS throughput. Abso-
lute accuracy is achieved via continuous internal
self-calibration. The device draws a nominal 330 µA.
Low-power, low-voltage operation, and a simple serial
interface make the CS5540 an ideal device for low-cost,
power-conscious DC measurement applications.
ORDERING INFORMATION
CS5540-AS -40 ºC - +85 ºC
16-Pin SSOP
VA+
CHS
AIN1+
AIN1-
AIN2+
AIN2-
Input
Mux
VREF+
VREF-
OSC1 OSC2
X1
X1
X1
Differential
4th Order
∆Σ
Modulator
X1
Clock
Generator
Digital
Filter
VA-
VD+
Serial
Interface
Calibration
Register
Output
Register
DGND
CS
SDO
SCLK
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
P.O. Box 17847, Austin, Texas 78760
[phone] FAX: [phone]
http://www.cirrus.com
Copyright  Cirrus Logic, Inc. 2000
(All Rights Reserved)
JUN ‘01
DS503PP1
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