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Cirrus Logic

CS5451A Datasheet Preview

CS5451A Datasheet

Delta-sigma Analog-to-digital Converter

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CS5451A
Six-channel, Delta-sigma Analog-to-digital Converter
Features
• Synchronous Sampling
• On-chip 1.2 V Reference (25 ppm/°C typ.)
• Power Supply Configurations:
- VA+ = +3 V; VA- = -2 V; VD+ = +3 V
- Supply Tolerances: ±10%
• Power Consumption
- 23 mW Typical at VD+ = +3 V
• Simple Four-wire Serial Interface
• Charge pump driver output generates
negative power supply.
• Ground-referenced Bipolar Inputs
Description
The CS5451A is a highly integrated delta-sigma ( an-
alog-to-digital converter (ADC) developed for the power
measurement industry. The CS5451A combines six 
ADCs, decimation filters, and a serial interface on a sin-
gle chip. The CS5451A interfaces directly to a current
transformer or shunt to measure current, and to a resis-
tive divider or transformer to measure voltage. The
product features a serial interface for communication
with a microcontroller or DSP. The product is initialized
and fully functional upon reset, and includes a voltage
reference.
ORDERING INFORMATION:
See page 13.
GAIN
VA+
RESET
IIN1+
IIN1-
VIN1+
VIN1-
x1, 20
x1
4th Order  Modulator
4th Order  Modulator
Decimation Filter
Decimation Filter
IIN2+
x1, 20
4th Order  Modulator
Decimation Filter
IIN2-
VIN2+
VIN2-
x1
4th Order  Modulator
Decimation Filter
IIN3+
IIN3-
VIN3+
VIN3-
VREFIN
VREFOUT
x1, 20 4th Order  Modulator
x1 4th Order  Modulator
x1
Voltage
Reference
Decimation Filter
Decimation Filter
Clock
VD+
Serial
Interface
Pulse Output
Regulator
SE
OWRS
SDO
FSO
SCLK
CPD
AGND
VA- XIN
DGND
http://www.cirrus.com
Copyright Cirrus Logic, Inc. 2011
(All Rights Reserved)
APR ‘11
DS635F4




Cirrus Logic

CS5451A Datasheet Preview

CS5451A Datasheet

Delta-sigma Analog-to-digital Converter

No Preview Available !

CS5451A
TABLE OF CONTENTS
1. PIN DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. CHARACTERISTICS AND SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4. FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 Digital Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3 Performing Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.4 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.5 System Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.6 Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.7 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5. PACKAGE DIMENSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6. ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION . . . . . . . . . . . . . . . 13
8. REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
LIST OF FIGURES
Figure 1. Serial Port Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Typical Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. One Data Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. Serial Port Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Generating VA- with a Charge Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 DS635F4


Part Number CS5451A
Description Delta-sigma Analog-to-digital Converter
Maker Cirrus Logic
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