Datasheet

REV. D
AD7713
–25–
OTHER 24-BIT SIGNAL CONDITIONING ADCS AVAILABLE
FROM ANALOG DEVICES
AD7710
FEATURES
Charge Balancing
24 Bits No Missing Codes
ⴞ0.0015% Nonlinearity
2-Channel Programmable Gain Front End
Gains from 1 to 128
Differential Inputs
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
(7 mW typ)
APPLICATIONS
Weigh Scales
Thermocouples
Smart Transmitters
Chromatography
AD7711
FEATURES
Charge Balancing ADC
24 Bits No Missing Codes
ⴞ0.0015% Nonlinearity
2-Channel Programmable Gain Front End
Gains from 1 to 128
1 Differential Input
1 Single-Ended Input
Low-Pass Filter with Programmable Filter Cutoff
Ability to Read/Write Calibration Coefficients
RTD Excitation Current Sources
Bidirectional Microcontroller Serial Interface
Internal/External Reference Option
Single- or Dual-Supply Operation
Low Power (25 mW typ) with Power-Down Mode
(7 mW typ)
APPLICATIONS
RTD Transducers
Process Control
Smart Transmitters
Portable Industrial Instruments
FUNCTIONAL BLOCK DIAGRAM
CHARGING BALANCING A/D
CONVERTER
AUTO-ZEROED
⌺–⌬
MODULATOR
DIGITAL
FILTER
CLOCK
GENERATION
AD7710
MUX
AGND DGND
MCLK
OUT
MCLK
IN
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
REF
IN(+)
AV
DD
DV
DD
AV
DD
4.5␮A
A = 1 – 128
V
SS
AV
DD
20␮A
V
BIAS
REF OUT
REF
IN(–)
SYNC
RTD
CURRENT
2.5V REFERENCE
PGA
SERIAL INTERFACE
CONTROL
REGISTER
OUTPUT
REGISTER
MODE SDATA A0DRDYTFSRFS SCLK
FUNCTIONAL BLOCK DIAGRAM
CHARGING BALANCING A/D
CONVERTER
AUTO-ZEROED
⌺–⌬
MODULATOR
DIGITAL
FILTER
CLOCK
GENERATION
AD7711
MUX
AGND DGND
MCLK
OUT
MCLK
IN
AIN1(+)
AIN1(–)
AIN2
REF
IN(+)
AV
DD
DV
DD
AV
DD
4.5␮A
A = 1 – 128
V
SS
V
BIAS
REF OUT
REF
IN(–)
SYNC
RTD2
RTD1
2.5V REFERENCE
PGA
AV
DD
200␮A
200␮A
SERIAL INTERFACE
CONTROL
REGISTER
OUTPUT
REGISTER
MODE SDATA A0DRDYTFSRFS SCLK