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MFG:ADI D/C:09
Part Number: AD7949
MFG: ADI
D/C: 09
Description: The AD7949 is an 8-channel, 14-bit, charge redistribution successive approximation register (SAR) anal...
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AD7949
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DataSheet
General Description
AD7949 General 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.
AD7949 Maximum Ratings
| 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 |
2 CNV must be low during power up. See the Power Supply section
AD7949 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
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
AD7949 Typical 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
Medical instruments: ECG/EKG
Mobile communications: GPS
Personal digital assistants
Power line monitoring
Data acquisition
Seismic data acquisition systems
Instrumentation
Process control
AD7001
PDF/DataSheet Download
- Datasheet: AD7001
- File Size: 634418 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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