Cirrus Logic CS5451A - Manual

Copyright  Cirrus Logic, Inc. 2011
(All Rights Reserved)
http://www.cirrus.com
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.
VREFIN
VREFOUT
IIN1+
IIN1-
VIN1+
VIN1-
VIN2+
VIN2-
VIN3+
VIN3-
IIN2+
IIN2-
IIN3+
IIN3-
VA+ VD+
AGND
SE
FSO
SDO
SCLK
Voltage
Reference
Serial
Interface
RESET
Decimation Filter
Decimation Filter
Decimation Filter
Decimation Filter
Decimation Filter
Decimation Filter
x1, 20
x1
4th Order
 Modulator
x1
x1, 20
x1
x1, 20
x1
4th Order
 Modulator
4th Order
 Modulator
4th Order
 Modulator
4th Order
 Modulator
4th Order
 Modulator
GAIN
CPD
OWRS
XIN DGND VA-
Clock
Pulse Output
Regulator
APR ‘11
DS635F4