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AD7942

Features: 14-bit resolution with no missing codesThroughput: 250 kSPSINL: ±0.4 LSB typ, ±1 LSB max (±0.0061 % of FSR)S/(N + D): 85 dB @ 20 kHzTHD: −100 dB @ 20 kHzPseudo-differential analog input range0 V to VREF with VREF up to VDDNo pipeline delaySingle-supply 5V operation with1.8 V/2.5 V/...

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SeekIC No. : 004271380 Detail

AD7942: Features: 14-bit resolution with no missing codesThroughput: 250 kSPSINL: ±0.4 LSB typ, ±1 LSB max (±0.0061 % of FSR)S/(N + D): 85 dB @ 20 kHzTHD: −100 dB @ 20 kHzPseudo-differential analog in...

AD7942 Data Sheet

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Part Number:
AD7942
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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




Application

Battery-powered equipment
Data acquisition
Instrumentation
Medical instruments
Process control




Pinout

AD7942 Diagram

Connection Diagram




Specifications

Resolution (Bits) 14bit
T-Put Rate 250kSPS
# Chan 1
Supply V Single(+2.5),Single(+3),Single(+3.3),Single(+5)
Pwr Diss 12.5mW
Interface Ser,SPI
Ain Range (Vref) p-p,Uni (Vref)
SNR (dB) 85dB
Pkg Type CSP,SOP


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





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.






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