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Cirrus Logic

CS5533 Datasheet Preview

CS5533 Datasheet

16-bit and 24-bit ADC

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CS5531/32/33/34
16-Bit and 24-Bit 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
500 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 CS5531/32/33/34 are highly integrated ∆Σ Analog-
to-Digital Converters (ADCs) which use charge-balance
techniques to achieve 16-bit (CS5531/33) and 24-bit
(CS5532/34) 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 (CS5531/32) or four-channel
(CS5533/34) devices and include a very low noise chop-
per-stabilized instrumentation amplifier (6 nV/Hz @ 0.1
Hz) with selectable gains of 1×, 2×, 4×, 8×, 16×, 32×, and
64×. These ADCs also include a fourth order ∆Σ modu-
lator 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 48
VA+ C1 C2 VREF+ VREF-
VD+
AIN1+
AIN1-
AIN2+
AIN2-
AIN3+
AIN3-
AIN4+
AIN4-
MUX
(CS5533/34
SHOWN)
PGIA
1,2,4,8,16
32,64
DIFFERENTIAL
4TH ORDER ∆Σ
MODULATOR
LATCH
PROGRAMMABLE
SINC FIR FILTER
SERIAL
INTERFACE
CLOCK
GENERATOR
CALIBRATION
SRAM/CONTROL
LOGIC
CS
SDI
SDO
SCLK
VA-
A0/GUARD
A1
OSC1 OSC2
DGND
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. 2002
(All Rights Reserved)
MAR ‘02
DS289PP5
1




Cirrus Logic

CS5533 Datasheet Preview

CS5533 Datasheet

16-bit and 24-bit ADC

No Preview Available !

CS5531/32/33/34
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ..........................................................5
ANALOG CHARACTERISTICS..........................................................................5
TYPICAL RMS NOISE (NV), CS5531/32/33/34-AS ...........................................8
TYPICAL NOISE FREE RESOLUTION(BITS), CS5532/34-AS .........................8
TYPICAL RMS NOISE (NV), CS5532/34-BS .....................................................9
TYPICAL NOISE FREE RESOLUTION(BITS), CS5532/34-BS .........................9
5 V DIGITAL CHARACTERISTICS ..................................................................10
3 V DIGITAL CHARACTERISTICS ..................................................................10
DYNAMIC CHARACTERISTICS ......................................................................11
ABSOLUTE MAXIMUM RATINGS ...................................................................11
SWITCHING CHARACTERISTICS ..................................................................12
2. GENERAL DESCRIPTION .......................................................................................14
2.1. Analog Input ....................................................................................................14
2.1.1. Analog Input Span .................................................................................... 15
2.1.2. Multiplexed Settling Limitations ............................................................15
2.1.3. Voltage Noise Density Performance .....................................................15
2.1.4. No Offset DAC ......................................................................................15
2.2. Overview of ADC Register Structure and Operating Modes ............................16
2.2.1. System Initialization ..............................................................................17
2.2.2. Command Register Quick Reference ..................................................19
2.2.3. Command Register Descriptions ..........................................................20
2.2.4. Serial Port Interface ..............................................................................24
2.2.5. Reading/Writing On-Chip Registers ......................................................25
2.3. Configuration Register .....................................................................................25
2.3.1. Power Consumption .............................................................................25
2.3.2. System Reset Sequence ......................................................................25
2.3.3. Input Short ............................................................................................26
2.3.4. Guard Signal .........................................................................................26
2.3.5. Voltage Reference Select .....................................................................26
2.3.6. Output Latch Pins .................................................................................26
2.3.7. Offset and Gain Select ..........................................................................27
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/sales.cfm
SPI is a registered trademark of International Business Machines Corporation.
Microwire is a trademark of National Semiconductor Corporation.
IMPORTANT NOTICE
"Preliminary" product information describes products that are in production, but for which full characterization data is not yet available. "Advance" product infor-
mation describes products that are in development and subject to development changes. Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the infor-
mation contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty
of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being
relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this
information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus
and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or
other intellectual property rights. Cirrus owns the copyrights of the information contained herein and gives consent for copies to be made of the information only
for use within your organization with respect to Cirrus integrated circuits or other parts of Cirrus. This consent does not extend to other copying such as copying
for general distribution, advertising or promotional purposes, or for creating any work for resale.
An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this ma-
terial and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. An export license and/or quota needs to be
obtained from the competent authorities of the Chinese Government if any of the products or technologies described in this material is subject to the PRC Foreign
Trade Law and is to be exported or taken out of the PRC.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE
PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANT-
ED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS
IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trade-
marks or service marks of their respective owners.
2 DS289PP5


Part Number CS5533
Description 16-bit and 24-bit ADC
Maker Cirrus Logic
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CS5533 Datasheet PDF






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