Datasheet
REV. D–26–
AD7713
AD7712
FEATURES
Charge Balancing ADC
24 Bits No Missing Codes
ⴞ0.0015% Nonlinearity
High Level and Low Level Analog Input Channels
Programmable Gain for Both Inputs
Gains from 1 to 128
Differential Input for Low Level Channel
Low-Pass Filter with Programmable Filter Cutoffs
Ability to Read/Write Calibration Coefficients
Bidirectional Microcontroller Serial Interface
Internal/External Reference Option
Single- or Dual-Supply Operation
Low Power (25 mW typ) with Power-Down Mode
(100 W typ)
APPLICATIONS
Process Control
Smart Transmitters
Portable Industrial Instruments
FUNCTIONAL BLOCK DIAGRAM
CHARGING BALANCING A/D
CONVERTER
AUTO-ZEROED
⌺–⌬
MODULATOR
DIGITAL
FILTER
CLOCK
GENERATION
AD7712
MUX
AGND DGND
MCLK
OUT
MCLK
IN
AIN1(+)
AIN1(–)
REF
IN(+)
AV
DD
DV
DD
AV
DD
4.5A
A = 1 – 128
V
SS
V
BIAS
REF OUT
REF
IN(–)
SYNC
STANDB
Y
TP
AIN2
2.5V REFERENCE
PGA
SERIAL INTERFACE
CONTROL
REGISTER
OUTPUT
REGISTER
MODE SDATA A0DRDYTFSRFS SCLK
VOLTAGE
ATTENUATION