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MFG:ADI D/C:09
Part Number: AD7942
MFG: ADI
D/C: 09
Description: The AD7942 is a 14-bit, charge redistribution successive approximation, analog-to-digital converter (A...
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AD7942
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DataSheet
General Description
AD7942 General Description
The AD7942 is a 14-bit, charge redistribution successive approximation, analog-to-digital converter (ADC) that operates from a single 5V power supply, VDD. It contains a low power, high speed, 14-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN−. 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 AD7942 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
AD7942 Maximum Ratings
| Parameter | Rating |
| Analog Inputs IN+3, 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 −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 |
AD7942 Features
14-bit resolution with no missing codes
Throughput: 250 kSPS
INL: ±0.4 LSB typ, ±1 LSB max (±0.0061 % of FSR)
S/(N + D): 85 dB @ 20 kHz
THD: −100 dB @ 20 kHz
Pseudo-differential analog input range
0 V to VREF with VREF up to VDD
No pipeline delay
Single-supply 5V operation with
1.8 V/2.5 V/3 V/5 V logic interface
Serial interface SPI®/QSPI™/µWire/DSP compatible
Daisy chain multiple ADCs and BUSY indicator
Power dissipation
1.15 mW @ 2.5 V/100 kSPS, 3.3 mW @ 5 V/100 kSPS,
1.15 µW @ 2.5 V/100 SPS Stand-by current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
Pin-for-pin compatible with the 16-Bit AD7685
Throughput: 250 kSPS
INL: ±0.4 LSB typ, ±1 LSB max (±0.0061 % of FSR)
S/(N + D): 85 dB @ 20 kHz
THD: −100 dB @ 20 kHz
Pseudo-differential analog input range
0 V to VREF with VREF up to VDD
No pipeline delay
Single-supply 5V operation with
1.8 V/2.5 V/3 V/5 V logic interface
Serial interface SPI®/QSPI™/µWire/DSP compatible
Daisy chain multiple ADCs and BUSY indicator
Power dissipation
1.15 mW @ 2.5 V/100 kSPS, 3.3 mW @ 5 V/100 kSPS,
1.15 µW @ 2.5 V/100 SPS Stand-by current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
Pin-for-pin compatible with the 16-Bit AD7685
AD7942 Typical Application
Battery-powered equipment
Data acquisition
Instrumentation
Medical instruments
Process control
Data acquisition
Instrumentation
Medical instruments
Process control
AD7942 Connection Diagram
AD7942
PDF/DataSheet Download
- Datasheet: AD7942
- File Size: 648752 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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