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MFG:ADI D/C:09
Part Number: AD7719
MFG: ADI
D/C: 09
Description: The AD7719 is a complete analog front end for low frequency measurement applications. It contains two ...
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AD7719
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DataSheet
General Description
AD7719 General Description
The AD7719 is a complete analog front end for low frequency measurement applications. It contains two high resolution sigma-delta ADCs, switchable matched excitation current sources, low-side power switches, digital I/O port, and temperature sensor. The 24-bit main channel with PGA accepts fully differen- tial, unipolar, and bipolar input signal ranges from 1.024 ×REFIN1/128 to 1.024 × REFIN1. Signals can be converted directly from a transducer without the need for signal condi- tioning. The 16-bit auxiliary channel has an input signal range of REFIN2 or REFIN2/2.
The device operates from a 32 kHz crystal with an on-chip PLL generating the required internal operating frequency. The output data rate from the part is software programmable. The peak-to-peak resolution from the part varies with the programmed gain and output data rate.
The part operates from a single 3 V or 5 V supply. When oper-ating from 3 V supplies, the power dissipation for the part is 4.5 mW with both ADCs enabled and 2.85 mW with only the main ADC enabled in unbuffered mode. The AD7719 is housed in 28-lead SOIC and TSSOP packages.
AD7719 Maximum Ratings
AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
AVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
DVDD to AGND . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 0.3 V to +7 V
DVDD to DGND . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 0.3 V to +7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mV to +20 mV
PWRGND to AGND2 . . . . . . . . . . .. . . . . . . . . . . . . . 20 mV to +20 mV
AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 5 V to +5 V
Analog Input Voltage to AGND . . . .. . . . . . . . . .0.3 V to AVDD +0.3 V
Reference Input Voltage to AGND . .. . .. . . . . . . 0.3 V to AVDD +0.3 V
Total AIN/REFIN Current (Indefinite) . . . . . . . . . . . . . . . . . . . . . . 30 mA
Digital Input Voltage to DGND . . .. . . . .. . . . . . . . 0.3 V to DVDD +0.3 V
Digital Output Voltage to DGND . .. . . . . . . . . . . . 0.3 V to DVDD +0.3 V
Operating Temperature Range . . . . . . . . . .. . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . .. . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 150°C
SOIC Package
JA Thermal Impedance . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 71.4°C/W
JC Thermal Impedance . . . . . . . . . . . . . . . . . . .. . . ... . . . . . . 23°C/W
TSSOP Package
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97.9°C/W
JC Thermal Impedance . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . 14°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 220°C
AVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
DVDD to AGND . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 0.3 V to +7 V
DVDD to DGND . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 0.3 V to +7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mV to +20 mV
PWRGND to AGND2 . . . . . . . . . . .. . . . . . . . . . . . . . 20 mV to +20 mV
AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 5 V to +5 V
Analog Input Voltage to AGND . . . .. . . . . . . . . .0.3 V to AVDD +0.3 V
Reference Input Voltage to AGND . .. . .. . . . . . . 0.3 V to AVDD +0.3 V
Total AIN/REFIN Current (Indefinite) . . . . . . . . . . . . . . . . . . . . . . 30 mA
Digital Input Voltage to DGND . . .. . . . .. . . . . . . . 0.3 V to DVDD +0.3 V
Digital Output Voltage to DGND . .. . . . . . . . . . . . 0.3 V to DVDD +0.3 V
Operating Temperature Range . . . . . . . . . .. . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . .. . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 150°C
SOIC Package
JA Thermal Impedance . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 71.4°C/W
JC Thermal Impedance . . . . . . . . . . . . . . . . . . .. . . ... . . . . . . 23°C/W
TSSOP Package
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97.9°C/W
JC Thermal Impedance . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . 14°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 220°C
AD7719 Features
HIGH RESOLUTION - ADCs
Two Independent ADCs (16- and 24-Bit Resolution)
Factory-Calibrated (Field Calibration Not Required)
Output Settles in One Conversion Cycle (Single
Conversion Mode)
Programmable Gain Front End
Simultaneous Sampling and Conversion of Two
Signal Sources
Separate Reference Inputs for Each Channel
Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz
Update Rate
ISOURCE SelectTM
24-Bit No Missing Codes-Main ADC
13-Bit p-p Resolution @ 20 Hz, 20 mV Range
18-Bit p-p Resolution @ 20 Hz, 2.56 V Range
INTERFACE
3-Wire Serial
SPITM , QSPI TM, MICROWIRETM and DSP-Compatible
Schmitt Trigger on SCLK
POWER
Specified for Single 3 V and 5 V Operation
Normal: 1.5 mA Typ @ 3 V
Power-Down: 10 A (32 kHz Crystal Running)
ON-CHIP FUNCTIONS
Rail-Rail Input Buffer and PGA
4-Bit Digital I/O Port
On-Chip Temperature Sensor
Dual Switchable Excitation Current Sources
Low-Side Power Switches
Reference Detect Circuit
Two Independent ADCs (16- and 24-Bit Resolution)
Factory-Calibrated (Field Calibration Not Required)
Output Settles in One Conversion Cycle (Single
Conversion Mode)
Programmable Gain Front End
Simultaneous Sampling and Conversion of Two
Signal Sources
Separate Reference Inputs for Each Channel
Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz
Update Rate
ISOURCE SelectTM
24-Bit No Missing Codes-Main ADC
13-Bit p-p Resolution @ 20 Hz, 20 mV Range
18-Bit p-p Resolution @ 20 Hz, 2.56 V Range
INTERFACE
3-Wire Serial
SPITM , QSPI TM, MICROWIRETM and DSP-Compatible
Schmitt Trigger on SCLK
POWER
Specified for Single 3 V and 5 V Operation
Normal: 1.5 mA Typ @ 3 V
Power-Down: 10 A (32 kHz Crystal Running)
ON-CHIP FUNCTIONS
Rail-Rail Input Buffer and PGA
4-Bit Digital I/O Port
On-Chip Temperature Sensor
Dual Switchable Excitation Current Sources
Low-Side Power Switches
Reference Detect Circuit
AD7719 Typical Application
Sensor Measurement
Temperature Measurement
Pressure Measurements
Weigh Scales
Portable Instrumentation
420 mA Transmitters
Temperature Measurement
Pressure Measurements
Weigh Scales
Portable Instrumentation
420 mA Transmitters
AD7719 Connection Diagram
AD7719
PDF/DataSheet Download
- Datasheet: AD7719
- File Size: 376190 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
- ·AD7001
- AD [Analog Devices]
- LC2MOS GSM Baseband I/O Port
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- ·AD7001AS
- AD [Analog Devices]
- LC2MOS GSM Baseband I/O Port
- 634418 KB
- ·AD7002
- AD [Analog Devices]
- LC2MOS GSM Baseband I/O Port
- 466516 KB
- ·AD7002AS
- AD [Analog Devices]
- LC2MOS GSM Baseband I/O Port
- 466516 KB
- ·AD7008
- AD [Analog Devices]
- CMOS DDS Modulator
- 517485 KB
- ·AD7008/PCB
- AD [Analog Devices]
- CMOS DDS Modulator
- 517485 KB
- ·AD7008AP20
- AD [Analog Devices]
- CMOS DDS Modulator
- 517485 KB
- ·AD7008JP50
- AD [Analog Devices]
- CMOS DDS Modulator
- 517485 KB
AD7719 Relative Products
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