AD7713 Analog Devices, AD7713 Datasheet - Page 25

• Manufacturer Part Number: AD7713
• Description: CMOS, Low Power 24-Bit Sigma-Delta, Signal Conditioning ADC with Matched RTD Current Sources
• Manufacturer: Analog Devices

Specifications of AD7713

• Resolution (bits): 24bit
• # Chan: 3
• Sample Rate: 3.9kSPS
• Interface: Ser
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Uni
• Ain Range: (2Vref/PGA Gain) p-p,Uni (Vref) x 4,Uni (Vref)/(PGA Gain)
• Adc Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC

AD7710
FEATURES
Charge Balancing
2-Channel Programmable Gain Front End
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
APPLICATIONS
Weigh Scales
Thermocouples
Smart Transmitters
Chromatography
AD7711
FEATURES
Charge Balancing ADC
2-Channel Programmable Gain Front End
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
APPLICATIONS
RTD Transducers
Process Control
Smart Transmitters
Portable Industrial Instruments
REV. D
24 Bits No Missing Codes
Gains from 1 to 128
Differential Inputs
(7 mW typ)
24 Bits No Missing Codes
Gains from 1 to 128
1 Differential Input
1 Single-Ended Input
(7 mW typ)
0.0015% Nonlinearity
0.0015% Nonlinearity
OTHER 24-BIT SIGNAL CONDITIONING ADCS AVAILABLE
FROM ANALOG DEVICES
–25–
CURRENT
AIN1(+)
AIN1(–)
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
RTD1
RTD2
AIN2
RTD
AGND DGND
AGND DGND
AV
AV
AV
AD7711
AV
AD7710
DD
AV
DD
FUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL BLOCK DIAGRAM
DD
DD
DD
DV
200 A
DV
4.5 A
4.5 A
20 A
DD
200 A
DD
V
V
SS
IN(–)
REF
A = 1 – 128
SS
IN(–)
REF
A = 1 – 128
AV
PGA
PGA
RFS
DD
RFS
IN(+)
REF
IN(+)
REF
REGISTER
CONTROL
TFS
REGISTER
CONTROL
TFS
CHARGING BALANCING A/D
AUTO-ZEROED
CHARGING BALANCING A/D
MODULATOR
AUTO-ZEROED
MODE SDATA
SERIAL INTERFACE
MODULATOR
MODE SDATA
SERIAL INTERFACE
V
V
BIAS
CONVERTER
–
BIAS
CONVERTER
–
2.5V REFERENCE
GENERATION
2.5V REFERENCE
GENERATION
SCLK
REGISTER
SCLK
CLOCK
OUTPUT
REGISTER
REF OUT
DIGITAL
CLOCK
FILTER
OUTPUT
REF OUT
DIGITAL
FILTER
AD7713
DRDY
DRDY
A0
A0
SYNC
MCLK
IN
MCLK
OUT
MCLK
IN
MCLK
OUT
SYNC