Overview
Features and Benefits
- 14-bit resolution with no missing codes
- 8-channel multiplexer with choice of inputs
Unipolar single-ended
Differential (GND sense)
Pseudobipolar
- Multiple reference types
Internal selectable 2.5 V or 4.096 V
External buffered (up to 4.096 V)
External (up to VDD) - See datasheet for additional features
Product Details
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
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Tools & Simulations
IBIS Models
Product Recommendations
AD7949 Companion Parts
Recommended Driver Amplifiers
-
For precision, low power, low distortion applications
: ADA4805-1, ADA4805-2, ADA4841-1, ADA4841-2. - For a fully differential attenuating precision amplifier: AD8475.
- For low noise, low power single-to-differential driver amplifier: ADA4941-1.
- For 5V single supply and low noise: AD8655.
-
High frequency, low noise, low distortion applications
: ADA4807-1, ADA4807-2, ADA4897-1, ADA4897-2.
Recommended External References
Reference Materials
Technical Articles (1)
Design Resources
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PCN-PDN Information
Support & Discussions
AD7949 Discussions
Sample & Buy
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