AD7949 14-Bit, 8-Channel, 250 kSPS PulSAR ADC
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 multiplexer that is 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°C to +85°C.
Applications
- Multichannel system monitoring
- 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
Features and Benefits14-bit resolution with no missing codes8-channel multiplexer with choice of inputs- Unipolar single-ended
- Differential (GND sense)
- Pseudobipolar
Unipolar single-endedDifferential (GND sense)PseudobipolarThroughput: 250 kSPSINL/DNL: ±0.5/±0.25 LSB typicalSINAD: 85 dB @ 20 kHzTHD: −100 dB @ 20 kHzAnalog input range: 0 V to VREF with VREF up to VDDSee data sheet for additional featuresDownload AD7949-EP data sheetMilitary temperature range (−55°C to +125°C)Controlled manufacturing baselineEnhanced product change notificationQualification data available on requestV62/12645 DSCC Drawing Number | |
Data Sheets
Application Notes
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| AD7949BCPZ Production | 20 ld LFCSP (4x4mm 2.5EP) | OTH 490 | -40 to 85C | 4.46 | 4.04 | Y |
| AD7949BCPZRL7 Production | 20 ld LFCSP (4x4mm 2.5EP) | REEL 1500 | -40 to 85C | 0 | 4.04 | Y |
| AD7949SCPZ-EP-R2 Production | 20 ld LFCSP (4x4mm 2.5EP) | REEL 250 | | 0 | 8.48 | Y |
| AD7949SCPZ-EP-RL7 Production | 20 ld LFCSP (4x4mm 2.5EP) | REEL 1500 | -55 to 125C | 0 | 8.08 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| EVAL-AD7949EDZ | Evaluation Board | 59 | Y |
| EVAL-CED1Z | Evaluation Controller Board | 249 | Y |
Reference Materials
