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%
Description
The CS5451A is a highly integrated delta-sigma (∆Σ) an-
alog-to-digital converter (ADC) developed for the power
measurement industry. The CS5451A combines six
∆Σ
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.
• 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
GAIN
IIN1+
IIN1-
VIN1+
VIN1-
IIN2+
IIN2-
VIN2+
VIN2-
VA+
4th Order
∆Σ
Modulator
4th Order
∆Σ
Modulator
ORDERING INFORMATION:
See
RESET
VD+
x1, 20
Decimation Filter
x1
Decimation Filter
x1, 20
4th Order
∆Σ
Modulator
Decimation Filter
SE
x1
4th Order
∆Σ
Modulator
4th Order
∆Σ
Modulator
Decimation Filter
Serial
Interface
OWRS
SDO
FSO
SCLK
IIN3+
IIN3-
VIN3+
VIN3-
VREFIN
VREFOUT
x1, 20
Decimation Filter
x1
4th Order
∆Σ
Modulator
Decimation Filter
x1
Voltage
Reference
Clock
Pulse Output
Regulator
CPD
AGND
VA-
XIN
DGND
Copyright
©
Cirrus Logic, Inc. 2005
(All Rights Reserved)
AUG ‘05
DS635F2
CIRRUS [ CIRRUS LOGIC ]
