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AD7949

Features: 14-bit resolution with no missing codes8-channel multiplexer with choice of inputsUnipolar single endedDifferential (GND sense)PseudobipolarThroughput: 250 kSPSINL/DNL: ±0.5 LSB typicalSINAD: 85 dB @ 20 kHzTHD: 100 dB @ 20 kHzAnalog input range: 0 V to VREF with VREF up to VDDMultiple re...

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SeekIC No. : 004271394 Detail

AD7949: Features: 14-bit resolution with no missing codes8-channel multiplexer with choice of inputsUnipolar single endedDifferential (GND sense)PseudobipolarThroughput: 250 kSPSINL/DNL: ±0.5 LSB typicalSIN...

AD7949 Data Sheet

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Part Number:
AD7949
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:

14-bit resolution with no missing codes
8-channel multiplexer with choice of inputs
Unipolar single ended
Differential (GND sense)
Pseudobipolar
Throughput: 250 kSPS
INL/DNL: ±0.5 LSB typical
SINAD: 85 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 2.9 mW @ 2.5 V/200 kSPS 10.8 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




Pinout

AD7949 Diagram




Specifications

Resolution (Bits) 14bit
T-Put Rate 250kSPS
# Chan 8
Supply V Single(+2.3 to +5.5)
Pwr Diss (max) 13.5mW
Interface Ser,SPI
SNR (dB) 85.5dB
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 during power up. See the Power Supply section




Description

The AD7949 is an 8-channel, 14-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC) that operates from a single power supply, VDD.

The AD7949 contains all components for use in a multichannel, low power data acquisition system, including a true 14-bit SAR ADC with no missing codes; an 8-channel, low crosstalk multi-plexer 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 AD7949 uses 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.

The AD7949 is housed in a tiny 20-lead LFCSP with operation specified from −40 to +85.






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