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AD7689

Features: 16-bit resolution with no missing codes4-channel (AD7682)/8-channel (AD7689) multiplexer with choice of inputsUnipolar single endedDifferential (GND sense)PseudobipolarThroughput: 250 kSPSINL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)Dynamic range: 93.8 dBSINAD: 92.5 dB @ 20 kH...

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SeekIC No. : 004270688 Detail

AD7689: Features: 16-bit resolution with no missing codes4-channel (AD7682)/8-channel (AD7689) multiplexer with choice of inputsUnipolar single endedDifferential (GND sense)PseudobipolarThroughput: 250 kSPS...

AD7689 Data Sheet

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Part Number:
AD7689
Supply Ability:
5000

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

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Product Details

Description



Features:

16-bit resolution with no missing codes
4-channel (AD7682)/8-channel (AD7689) multiplexer with choice of inputs
Unipolar single ended
Differential (GND sense)
Pseudobipolar
Throughput: 250 kSPS
INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)
Dynamic range: 93.8 dB
SINAD: 92.5 dB @ 20 kHz
THD: −100 dB @ 20 kHz
Analog input range: 0 V to VREF with VREF up to VDD
Multiple reference types
Internal selectable 2.5 V or 4.096 V
External buffered (up to 4.096 V)
External (up to VDD)
Internal temperature sensor
Channel sequencer, selectable 1-pole filter, busy indicator
No pipeline delay, SAR architecture
Single-supply 2.7 V to 5.5 V operation with 1.8 V to 5 V logic interface
Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP
Power dissipation
3.5 mW @ 2.5 V/200 kSPS
12 mW @ 5 V/250 kSPS
Standby current: 50 nA
20-lead 4 mm × 4 mm LFCSP package




Application

Battery-powered equipment
Medical instruments: ECG/EKG
Mobile communications: GPS
Personal digital assistants
Power line monitoring
Data acquisition
Seismic data acquisition systems
Instrumentation
Process control




Specifications

Resolution (Bits) 16bit
T-Put Rate 250kSPS
# Chan 8
Supply V Multi(+3, +5),Multi(+3.3, +5),Single(+2.7 to +5.5),Single(+2.7),Single(+3),Single(+3.3),Single(+5)
Pwr Diss 19.2mW
Interface Ser,SPI
Ain Range (Vref) p-p,Bip (Vref) x 0.5,Uni (Vref)
SNR (dB) 93.5dB
Pkg Type CSP


Parameter Rating
Analog Inputs
INx,1 COM1

REF, REFIN
Supply Voltages
VDD, VIO to GND
VDD to VIO
DIN, CNV, SCK to GND2
SDO to GND
Storage Temperature Range
Junction Temperature
JA Thermal Impedance (LFCSP)
JC Thermal Impedance (LFCSP)
GND − 0.3 V to VDD + 0.3 V or VDD ± 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 to +150
150
47.6/W
4.4/W
1 See the Analog Inputs section.
2 CNV must be low at power up. See the Power Supply section.




Description

The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a single power supply, VDD.

The AD7682/AD7689 contain all components for use in a multichannel, low power data acquisition system, including a true 16-bit SAR ADC with no missing codes; a 4-channel (AD7682) or 8-channel (AD7689), low crosstalk multiplexer useful for configuring the inputs as single ended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order.

The AD7682/AD7689 use a simple SPI interface for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput.

Each AD7682/AD7689 is housed in a tiny 20-lead LFCSP with operation specified from −40 to +85






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