Overview
The AD7949SCPZ-EP-R2 is a high-performance, 8-channel, 14-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is designed for use in multi-channel, low power data acquisition systems. It operates from a single power supply, VDD, and features a charge redistribution successive approximation register (SAR) architecture with no missing codes. The AD7949 includes an internal low drift reference, a temperature sensor, a selectable one-pole filter, and a sequencer for continuous channel scanning. The device uses a simple SPI interface for configuration and data transfer, with the SPI interface supply, VIO, set to the host logic level.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Number of Channels | - | - | - | 8 | - |
| Resolution | - | - | - | 14 bits | - |
| Sample Rate | - | - | - | 250 kSPS | - |
| Power Supply Range | VDD | 2.3 V | - | 5.5 V | V |
| Operating Temperature Range | - | -55°C | - | +125°C | °C |
| Conversion Time | tCONV | 2.2 µs | - | - | µs |
| Acquisition Time | tACQ | 1.8 µs | - | - | µs |
| Time Between Conversions | tCYC | 4.0 µs | - | - | µs |
| CNV Pulse Width | tCNVH | 10 ns | - | - | ns |
| SCK Period | tSCK | - | - | - | ns |
Key Features
- True 14-bit SAR ADC with no missing codes: Ensures high accuracy and reliability in data conversion.
- 8-channel, low crosstalk multiplexer: Allows configuration of inputs as single-ended (with or without ground sense), differential, or bipolar.
- Internal low drift reference and buffer: Selectable 2.5 V or 4.096 V reference for stable and accurate conversions.
- Temperature sensor: Integrated temperature sensing for environmental monitoring.
- Selectable one-pole filter: Helps in noise reduction and signal conditioning.
- Sequencer for continuous channel scanning: Facilitates efficient and automated data acquisition.
- SPI interface: Simple and efficient interface for configuration and data transfer, with VIO set to the host logic level.
- Low power consumption: Power dissipation scales with throughput, making it suitable for low power applications.
- Compact 20-lead LFCSP package: Small footprint with operation specified from −55°C to +125°C.
Applications
- Seismic data acquisition systems: Ideal for high-precision data collection in seismic applications.
- Instrumentation: Suitable for various instrumentation needs requiring high accuracy and multi-channel data acquisition.
- Process control: Used in process control systems where precise and reliable data conversion is critical.
Q & A
- What is the resolution of the AD7949SCPZ-EP-R2 ADC?
The AD7949SCPZ-EP-R2 has a resolution of 14 bits.
- How many channels does the AD7949SCPZ-EP-R2 support?
The AD7949SCPZ-EP-R2 supports 8 channels.
- What is the sample rate of the AD7949SCPZ-EP-R2?
The sample rate of the AD7949SCPZ-EP-R2 is up to 250 kSPS.
- What is the operating temperature range of the AD7949SCPZ-EP-R2?
The operating temperature range is from −55°C to +125°C.
- What type of interface does the AD7949SCPZ-EP-R2 use for configuration and data transfer?
The AD7949SCPZ-EP-R2 uses a simple SPI interface.
- Does the AD7949SCPZ-EP-R2 have an internal reference and temperature sensor?
Yes, it includes an internal low drift reference (selectable 2.5 V or 4.096 V) and a temperature sensor.
- What is the package type and size of the AD7949SCPZ-EP-R2?
The AD7949SCPZ-EP-R2 is housed in a 20-lead LFCSP package with a size of 4mm x 4mm.
- Can the AD7949SCPZ-EP-R2 be used in low power applications?
Yes, the power dissipation of the AD7949SCPZ-EP-R2 scales with throughput, making it suitable for low power applications.
- What are some common applications of the AD7949SCPZ-EP-R2?
Common applications include seismic data acquisition systems, instrumentation, and process control.
- Is there an evaluation kit available for the AD7949SCPZ-EP-R2?
Yes, the EVAL-AD7949EDZ is a fully featured evaluation kit available for the AD7949.
