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MFG:ADI D/C:09
Part Number: AD7782
MFG: ADI
D/C: 09
Description: The AD7782 is a complete analog front end for low-frequency measurement applications. The 24-bit sigma...
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AD7782
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DataSheet
General Description
AD7782 General Description
The AD7782 is a complete analog front end for low-frequency measurement applications. The 24-bit sigma-delta ADC contains two fully differential analog input channels that can be config-
ured with a gain of 1 or 16 allowing full-scale input signal ranges of ±2.56 V or ±160 mV from a +2.5 V differential reference input.
The AD7782 has an extremely simple, read-only digital interface which can be operated in master mode or slave mode. There are no on-chip registers to be programmed. The input signal range and input channel selection are configured using two external pins.
The device operates from a 32.768 kHz crystal with an on-chip PLL generating the required internal operating frequency. The output data rate from the part is fixed via the master clock at 19.79 Hz and provides simultaneous 50 Hz and 60 Hz rejection at this update rate. Eighteen-bit p-p resolution can be obtained at this update rate.
The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.9 mW. The AD7782 is available in a 16-lead TSSOP package.
Another part in the AD778x family is the AD7783. It is similar to the AD7782 except it has two integrated current sources and only one differential input channel.
AD7782 Maximum Ratings
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..0.3 V to +7 V
Analog Input Voltage to GND . . . . . . . . . . . . . . . .. 0.3 V to VDD + 0.3 V
Reference Input Voltage to GND . . . . . . . . . . . . . .. 0.3 V to VDD + 0.3 V
Total AIN/REFIN Current (Indefinite) . . . . . . . . . . . . . . .. .. .. .. . . . .. 30 mA
Digital Input Voltage to GND . . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Digital Output Voltage to GND . . . . . . . . . . . . . . . . .0.3 V to VDD + 0.3 V
Operating Temperature Range . . . . . . . . . . . . . . . . . . .40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . .. .. .. . . . . . . . 150°C
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
Analog Input Voltage to GND . . . . . . . . . . . . . . . .. 0.3 V to VDD + 0.3 V
Reference Input Voltage to GND . . . . . . . . . . . . . .. 0.3 V to VDD + 0.3 V
Total AIN/REFIN Current (Indefinite) . . . . . . . . . . . . . . .. .. .. .. . . . .. 30 mA
Digital Input Voltage to GND . . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Digital Output Voltage to GND . . . . . . . . . . . . . . . . .0.3 V to VDD + 0.3 V
Operating Temperature Range . . . . . . . . . . . . . . . . . . .40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . .. .. .. . . . . . . . 150°C
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
AD7782 Features
2-Channel, 24-Bit - ADC
Pin Configurable (No Programmable Registers)
Pin Selectable Input Channels
Pin Programmable Input Ranges (2.56 V or 160 mV)
Fixed 19.79 Hz Update Rate
Simultaneous 50 Hz and 60 Hz Rejection
24-Bit No Missing Codes
18.5-Bit p-p Resolution (2.56 V Range)
16.5-Bit p-p Resolution (160 mV Range)
INTERFACE
Master or Slave Mode of Operation
Slave Mode
3-Wire Serial
SPI(TM), QSPI(TM), MICROWIRE(TM), and DSP-Compatible
Schmitt Trigger on SCLK
POWER
Specified for Single 3 V and 5 V Operation
Normal: 1.3 mA @ 3 V
Power-Down: 9 A
ON-CHIP FUNCTIONS
Rail-Rail Input Buffer and PGA
Pin Configurable (No Programmable Registers)
Pin Selectable Input Channels
Pin Programmable Input Ranges (2.56 V or 160 mV)
Fixed 19.79 Hz Update Rate
Simultaneous 50 Hz and 60 Hz Rejection
24-Bit No Missing Codes
18.5-Bit p-p Resolution (2.56 V Range)
16.5-Bit p-p Resolution (160 mV Range)
INTERFACE
Master or Slave Mode of Operation
Slave Mode
3-Wire Serial
SPI(TM), QSPI(TM), MICROWIRE(TM), and DSP-Compatible
Schmitt Trigger on SCLK
POWER
Specified for Single 3 V and 5 V Operation
Normal: 1.3 mA @ 3 V
Power-Down: 9 A
ON-CHIP FUNCTIONS
Rail-Rail Input Buffer and PGA
AD7782 Typical Application
Sensor Measurement
Industrial Process Control
Temperature Measurement
Pressure Measurements
Weigh Scales
Portable Instrumentation
Industrial Process Control
Temperature Measurement
Pressure Measurements
Weigh Scales
Portable Instrumentation
AD7782 Connection Diagram
AD7782
PDF/DataSheet Download
- Datasheet: AD7782
- File Size: 129318 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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