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MFG:ADI D/C:09
Part Number: AD7690
MFG: ADI
D/C: 09
Description: The AD7690/AD7691 is a 18-bit, successive approximation, analog-to-digital converter (ADC) that operat...
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AD7690
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DataSheet
General Description
AD7690 General Description
The AD7690/AD7691 is a 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between IN+ and IN− pins. The voltages on these pins usually swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage. Its power scales linearly with throughput.
The SPI-compatible serial interface also features the ability, using the SDI input, to daisy chain several ADCs on a single, 3-wire bus and provides an optional BUSY indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.
The AD7690/AD7691 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
AD7690 Maximum Ratings
| Parameter | Rating |
| Analog Inputs IN+1, IN−1 REF Supply Voltages VDD, VIO to GND VDD to VIO Digital Inputs to GND Digital Outputs to GND Storage Temperature Range Junction Temperature JA Thermal Impedance JC Thermal Impedance Lead Temperature Range Vapor Phase (60 sec) Infrared (15 sec) |
GND − 0.3 V to VDD + 0.3 V or ±130 mA GND − 0.3 V to VDD + 0.3 V −0.3 V to +7 V ±7 V −0.3 V to VIO + 0.3 V −0.3 V to VIO + 0.3 V −65°C to +150°C 150°C 200°C/W (MSOP-10) 44°C/W (MSOP-10) 215°C 220°C |
AD7690 Features
18-bit resolution with no missing codes
Throughput: 400 kSPS (AD7690), 250 kSPS (AD7691)
INL: ±1 LSB typ (±4 ppm of FSR), ±2.5 LSB max
Dynamic range: 102 dB @ 400 kSPS
Oversampled Dynamic range: 128 dB @1 kSPS (AD7690)
Noise-free-code-resolution: 20 bits @ 1 kSPS
Effective resolution: 22.7 bits @ 1 kSPS
S/(N + D): 102 dB @ 1 kHz
THD: −120 dB @ 1 kHz
True differential analog input range : ±VREF
0 V to VREF with VREF up to VDD on both inputs
No pipeline delay
Single-supply 5 V (AD7690), 2.7V or 5V (AD7691) operation with 1.8 V/2.5 V/3 V/5 V logic interface
Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible
Daisy-chain multiple ADCs and BUSY indicator
Power dissipation
5 mW @ 5 V/100 kSPS, 50 µW @ 5 V/1kSPS
Stand-by current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
QFN (LFCSP), 3 mm * 3 mm same space as SOT-23 Pin-for-pin compatible with the 16-Bit AD7693, AD7688, AD7687
Throughput: 400 kSPS (AD7690), 250 kSPS (AD7691)
INL: ±1 LSB typ (±4 ppm of FSR), ±2.5 LSB max
Dynamic range: 102 dB @ 400 kSPS
Oversampled Dynamic range: 128 dB @1 kSPS (AD7690)
Noise-free-code-resolution: 20 bits @ 1 kSPS
Effective resolution: 22.7 bits @ 1 kSPS
S/(N + D): 102 dB @ 1 kHz
THD: −120 dB @ 1 kHz
True differential analog input range : ±VREF
0 V to VREF with VREF up to VDD on both inputs
No pipeline delay
Single-supply 5 V (AD7690), 2.7V or 5V (AD7691) operation with 1.8 V/2.5 V/3 V/5 V logic interface
Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible
Daisy-chain multiple ADCs and BUSY indicator
Power dissipation
5 mW @ 5 V/100 kSPS, 50 µW @ 5 V/1kSPS
Stand-by current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
QFN (LFCSP), 3 mm * 3 mm same space as SOT-23 Pin-for-pin compatible with the 16-Bit AD7693, AD7688, AD7687
AD7690 Typical Application
Battery-powered equipment
Data acquisitions
Seismic Data Acquisition Systems
DVMs
Instrumentation
Medical instruments
Data acquisitions
Seismic Data Acquisition Systems
DVMs
Instrumentation
Medical instruments
AD7690 Connection Diagram
AD7690
PDF/DataSheet Download
- Datasheet: AD7690
- File Size: 1681308 KB
- Manufacturer: AD
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