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Cirrus Logic

CS5541 Datasheet Preview

CS5541 Datasheet

24-Bit Delta-Sigma ADC

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CS5541
Low-Power, Low-Voltage, 24-Bit ∆Σ ADC
Features
l ∆Σ Analog-to-Digital Converter
- Linearity Error: 0.0015% FS
- RMS Noise: 2 µV
l Two Channel Differential MUX
l Buffered, Fully Differential Analog and
www.DataSheet4UV.coolmtage Reference Inputs
l Scalable VREF Input: 0.1 V to Analog Supply
l Absolute Accuracy via Calibration
l Flexible Digital Filters
- Single Conversion Settling at 13.4 SPS or 4
Conversion Settling at 53.7 SPS with
Simultaneous 50/60 Hz Rejection
- Single Conversion Settling at 64.8 SPS or Four
Conversion Settling at 260 SPS with 16-bit
Resolution
l Simple 3-Wire Serial Interface
- SPITM and MicrowireTM Compatible
- Schmitt Trigger on Serial Clock (SCLK)
l Low Power
- Single +3.0 V Supply
- 330 µA Operating; 10 µA Sleep Current
Description
The CS5541 is a 24-bit low-power and low-voltage ∆Σ
analog-to-digital converter (ADC). It is optimized to con-
vert analog signals in DC measurement applications,
such as temperature and pressure measurement, 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 includes a two-channel multiplexer. Ab-
solute accuracy is achieved via one-time or continuous
calibration modes. The device draws less than 330µA.
The CS5541 includes two digital filters. The first filter,
which achieves simultaneous rejection of 50/60 Hz, pro-
vides single conversion settling at 13.4 SPS throughput
or four conversion settling at 53.7 SPS throughput. The
second filter, which achieves 16-bit performance, pro-
vides single conversion settling at 64.8 SPS throughput
or four conversion settling at 260 SPS throughput.
Low-power, low-voltage operation and an easy-to-con-
figure serial interface reduces time-to-market and makes
the CS5541 an ideal device for low-cost, power-con-
scious DC measurement applications.
ORDERING INFORMATION
CS5541-BS-40 ºC - +85 ºC
16-Pin SSOP
VA+
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
SDI
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
DS500PP1
1




Cirrus Logic

CS5541 Datasheet Preview

CS5541 Datasheet

24-Bit Delta-Sigma ADC

No Preview Available !

CS5541
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 Serial Port ........................................................................................................................ 13
www.DataSheet4U.com 2.7 Serial Port Initialization Sequence ................................................................................... 14
2.8 Command Register Quick Reference ............................................................................. 15
2.9 Performing Conversions/Calibrations .............................................................................. 16
2.9.1 Continuous Calibrations and Conversions (reduced output rate) ....................... 16
2.9.2 One Time Calibration followed by Continuous Conversions ............................... 17
2.9.3 Continuous Conversions with Default Calibration Coefficients ........................... 17
2.9.4 Continuous Conversions with Existing Calibration Coefficients .......................... 17
2.9.5 System Calibration .............................................................................................. 17
2.9.6 Reading Conversions .......................................................................................... 17
2.9.7 Output Coding ..................................................................................................... 18
2.9.8 Digital Filter ......................................................................................................... 18
2.10 Sleep and Standby Modes ............................................................................................. 20
2.11 Power-Up Sequence and Initialization ........................................................................... 20
2.12 PCB Layout .................................................................................................................... 20
3. PIN DESCRIPTIONS .............................................................................................................. 22
4. SPECIFICATION DEFINITIONS ............................................................................................. 24
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 DS500PP1


Part Number CS5541
Description 24-Bit Delta-Sigma ADC
Maker Cirrus Logic
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CS5541 Datasheet PDF






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