Overview
The AD7891AP-2, produced by Analog Devices Inc., is a comprehensive 8-channel, 12-bit data acquisition system. 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, all 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 AD7891AP-2 model specifically supports input ranges of 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V. The device features both parallel and serial interface options, determined by the MODE pin, ensuring easy integration with modern microprocessors, microcontrollers, and digital signal processors.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Resolution | 12 bits | |
| Number of Channels | 8 single-ended | |
| Input Ranges | 0 V to +2.5 V, 0 V to +5 V, ±2.5 V | For AD7891-2 model |
| Conversion Time | 1.6 µs | |
| Acquisition Time | 0.4 ms | For AD7891-2 model |
| Sample Rate | Up to 500 kSPS (single channel), 62.5 kSPS (channel hopping) | |
| Interface | Parallel and Serial | Determined by the MODE pin |
| Supply Voltage | 5 V ± 5% | |
| Power Dissipation | 82 mW (typical), 75 µW (standby) | |
| Operating Temperature Range | -40°C to 85°C | |
| Package | 44-terminal MQFP, 44-lead PLCC |
Key Features
- Fast 12-bit ADC with 1.6 µs conversion time
- 8 single-ended analog input channels with overvoltage protection on each channel
- Selection of input ranges: ±5 V, ±10 V for AD7891-1; 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 power-down mode
- Parallel and serial interface options
- 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 AD7891AP-2?
The AD7891AP-2 has a resolution of 12 bits.
- How many analog input channels does the AD7891AP-2 have?
The AD7891AP-2 has 8 single-ended analog input channels.
- What are the input ranges for the AD7891AP-2 model?
The AD7891AP-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 AD7891AP-2?
The conversion time of the AD7891AP-2 is 1.6 µs.
- What are the interface options for the AD7891AP-2?
The AD7891AP-2 offers both parallel and serial interface options, determined by the MODE pin.
- What is the power dissipation of the AD7891AP-2 in normal and standby modes?
The power dissipation is typically 82 mW in normal mode and 75 µW in standby mode.
- What is the operating temperature range of the AD7891AP-2?
The operating temperature range is -40°C to 85°C.
- In what packages is the AD7891AP-2 available?
The AD7891AP-2 is available in 44-terminal MQFP and 44-lead PLCC packages.
- Does the AD7891AP-2 have overvoltage protection?
- What are some typical applications of the AD7891AP-2?
Typical applications include data acquisition systems, motor control, mobile communication base stations, and instrumentation.
