Overview
The AD7891ASZ-2REEL is a high-performance, 8-channel, 12-bit data acquisition system produced by Analog Devices Inc. This component integrates an input multiplexer, an on-chip track/hold amplifier, a high-speed 12-bit analog-to-digital converter (ADC), and a 2.5 V reference on a single chip. It operates from a single 5 V supply and offers flexible analog input ranges, including 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V for the AD7891-2 model.
The AD7891ASZ-2REEL features both parallel and serial interface options, determined by the MODE pin, ensuring easy integration with modern microprocessors, microcontrollers, and digital signal processors. It is known for its fast conversion time of 1.6 μs and an acquisition time of 0.4 μs, allowing for high sample rates of up to 500 kSPS when sampling one channel and 62.5 kSPS when channel hopping.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 12 bits |
| Number of Channels | 8 |
| Sampling Rate | Up to 500 kSPS |
| Conversion Time | 1.6 μs max |
| Acquisition Time | 0.4 μs max (AD7891-2) |
| Voltage Supply | Single 5 V ± 5% |
| Power Dissipation | 82 mW typical (normal mode), 75 μW typical (standby mode) |
| Operating Temperature | -40°C to 85°C |
| Package Type | 44-terminal MQFP |
| Interface Options | Parallel and Serial |
| Overvoltage Protection | Up to ±17 V on unselected channels |
Key Features
- Fast 12-bit ADC with a conversion time of 1.6 μs and an acquisition time of 0.4 μs for the AD7891-2 model.
- Eight single-ended analog input channels with overvoltage protection on each channel.
- Flexible input ranges: ±5 V, ±10 V for AD7891-1, and 0 V to +2.5 V, 0 V to +5 V, ±2.5 V for AD7891-2.
- On-chip track/hold amplifier and 2.5 V reference.
- Single-supply, low-power operation with a power-down mode.
- Parallel and serial interface options.
- High-speed performance with simultaneous sampling capability.
- Surface mount 44-QFP package with tape and reel (TR) packaging for automated assembly.
Applications
- Data Acquisition Systems
- Motor Control Systems
- Mobile Communication Base Stations
- Instrumentation
Q & A
- What is the resolution of the AD7891ASZ-2REEL?
The AD7891ASZ-2REEL has a 12-bit resolution.
- How many analog input channels does the AD7891ASZ-2REEL have?
The AD7891ASZ-2REEL has 8 single-ended analog input channels.
- What are the available input ranges for the AD7891-2 model?
The AD7891-2 model supports input ranges of 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V.
- What is the conversion time of the AD7891ASZ-2REEL?
The conversion time is 1.6 μs max.
- Does the AD7891ASZ-2REEL have overvoltage protection?
- What are the interface options for the AD7891ASZ-2REEL?
The AD7891ASZ-2REEL offers both parallel and serial interface options.
- What is the power dissipation of the AD7891ASZ-2REEL in normal mode?
The power dissipation in normal mode is typically 82 mW.
- What is the operating temperature range of the AD7891ASZ-2REEL?
The operating temperature range is -40°C to 85°C.
- What type of package does the AD7891ASZ-2REEL come in?
The AD7891ASZ-2REEL comes in a 44-terminal MQFP package.
- Is the AD7891ASZ-2REEL RoHS compliant?
