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CS5540 Datasheet Preview

CS5540 Datasheet

24-Bit ADC

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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 VREF 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
- SPITM and MicrowireTM 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
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
Copyright Cirrus Logic, Inc. 2000
(All Rights Reserved)
JUN ‘01
DS503PP1
1




Crystal

CS5540 Datasheet Preview

CS5540 Datasheet

24-Bit ADC

No Preview Available !

CS5540
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 4
2. GENERAL DESCRIPTION ..................................................................................................... 10
2.1 Analog Input ..................................................................................................................... 10
2.1.1 Analog Input Model ............................................................................................. 10
2.2 Voltage Reference Input .................................................................................................. 11
2.2.1 Voltage Reference Input Model ........................................................................... 11
2.3 Power Supply Arrangements ........................................................................................... 12
2.4 Clock Generator ............................................................................................................... 12
2.5 Serial Port Interface ......................................................................................................... 12
2.6 Input Channel Selector .................................................................................................... 12
2.6.1 Switching Channels ............................................................................................. 13
2.7 Serial Port and Data Conversions .................................................................................... 13
2.7.1 Reading Conversions .......................................................................................... 14
2.7.2 Output Coding ..................................................................................................... 14
2.7.3 Digital Filter ......................................................................................................... 14
2.8 Sleep Mode ...................................................................................................................... 15
2.9 Power-Up and Initialization .............................................................................................. 16
2.10 PCB Layout .................................................................................................................... 16
3. PIN DESCRIPTIONS .............................................................................................................. 17
4. SPECIFICATION DEFINITIONS ............................................................................................. 19
5. PACKAGE DIMENSIONS ...................................................................................................... 20
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:
http://www.cirrus.com/corporate/contacts/
SPI is a trademark of Motorola Inc.
Microwire is a trademark of National Semiconductor Corp.
Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product infor-
mation describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure that the informa-
tion contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided AS ISwithout warranty
of any kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights
of third parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of
this publication may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or
otherwise) without the prior written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user. However, no
part of the printout or electronic files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechan-
ical, photographic, or otherwise) without the prior written consent of Cirrus Logic, Inc.Furthermore, no part of this publication may be used as a basis for man-
ufacture or sale of any items without the prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers
appearing in this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic,
Inc. trademarks and service marks can be found at http://www.cirrus.com.
2 DS503PP1


Part Number CS5540
Description 24-Bit ADC
Maker Crystal
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CS5540 Datasheet PDF






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