Overview
The AD7891ASZ-1REEL 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, making it suitable for a variety of applications. The AD7891ASZ-1REEL supports both parallel and serial interface structures, determined by the MODE pin, ensuring easy integration with modern microprocessors, microcontrollers, and digital signal processors.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Resolution | 12 | bits | |
| Number of Channels | 8 | Single-ended analog input channels | |
| Conversion Time | 1.6 μs | For AD7891-2 model | |
| Acquisition Time | 0.4 μs (hardware convert start), 0.7 μs (software convert start) | For AD7891-2 model | |
| Sample Rate | Up to 500 kSPS (single channel), 62.5 kSPS (channel hopping) | ||
| Input Ranges | 0 V to +2.5 V, 0 V to +5 V, ±2.5 V | For AD7891-2 model | |
| Supply Voltage | 5 V ± 5% | ||
| Power Dissipation | 82 mW (normal mode), 75 μW (standby mode) | ||
| Package Type | 44-terminal MQFP | ||
| Operating Temperature | -40°C to +85°C |
Key Features
- Fast 12-bit ADC with high conversion speed
- 8 single-ended analog input channels with overvoltage protection on each channel
- On-chip track/hold amplifier and 2.5 V reference
- Parallel and serial interface options determined by the MODE pin
- Single-supply, low power operation with power-down mode
- High dynamic performance including harmonic distortion and signal-to-noise ratio specifications
Applications
- Data Acquisition Systems
- Motor Control
- Mobile Communication Base Stations
- Instrumentation
Q & A
- What is the resolution of the AD7891ASZ-1REEL? The resolution is 12 bits.
- How many analog input channels does the AD7891ASZ-1REEL have? It has 8 single-ended analog input channels.
- What are the available input ranges for the AD7891-2 model? The input ranges are 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V.
- What is the conversion time of the AD7891ASZ-1REEL? The conversion time is 1.6 μs for the AD7891-2 model.
- What are the power dissipation values for the AD7891ASZ-1REEL? The power dissipation is 82 mW in normal mode and 75 μW in standby mode.
- What types of interfaces does the AD7891ASZ-1REEL support? It supports both parallel and serial interfaces.
- What is the operating temperature range of the AD7891ASZ-1REEL? The operating temperature range is -40°C to +85°C.
- Does the AD7891ASZ-1REEL have overvoltage protection? Yes, each channel has overvoltage protection.
- What is the package type of the AD7891ASZ-1REEL? It is available in a 44-terminal MQFP package.
- What are some typical applications of the AD7891ASZ-1REEL? Typical applications include data acquisition systems, motor control, mobile communication base stations, and instrumentation.
