Overview
The AD7891YSZ-1REEL is an 8-channel, 12-bit high-speed 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 ADC, a 2.5 V reference, and a high-speed interface on a single chip. It operates from a single 5 V supply and offers a choice of either parallel or serial interface structure, determined by the MODE pin. The AD7891 is designed for high accuracy and reliability, making it suitable for various applications requiring precise data acquisition.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Number of Channels | 8 | - | Single-ended analog input channels |
| Resolution | 12-bit | - | - |
| Conversion Time | 1.6 μs | μs | For AD7891-2 model |
| Acquisition Time | 0.4 ms (hardware), 0.7 ms (software) | ms | For AD7891-2 model |
| Sample Rate | 500 kSPS (single channel), 62.5 kSPS (channel hopping) | kSPS | - |
| Input Ranges | ±5 V, ±10 V (AD7891-1); 0 to +2.5 V, 0 to +5 V, ±2.5 V (AD7891-2) | V | - |
| Supply Voltage | 5 V ± 5% | V | - |
| Power Dissipation | 82 mW (normal mode), 75 mW (standby mode) | mW | - |
| Package Type | 44-terminal MQFP, 44-lead PLCC | - | - |
| Overvoltage Protection | ±17 V for AD7891-1 | V | On each channel |
Key Features
- High-speed 12-bit ADC with fast conversion times (1.6 μs for AD7891-2)
- On-chip track/hold amplifier and 2.5 V reference
- Parallel and serial interface options
- Single-supply operation (5 V) with low power consumption
- Overvoltage protection on each channel
- High dynamic performance parameters including harmonic distortion and signal-to-noise ratio
- Easy interfacing to microprocessors, microcontrollers, and digital signal processors
Applications
- Data acquisition systems
- Motor control systems
- Mobile communication base stations
- Instrumentation and measurement systems
Q & A
- What is the resolution of the AD7891? The AD7891 has a 12-bit resolution.
- How many analog input channels does the AD7891 have? The AD7891 has 8 single-ended analog input channels.
- What are the input range options for the AD7891? The AD7891-1 offers ±5 V and ±10 V, while the AD7891-2 offers 0 to +2.5 V, 0 to +5 V, and ±2.5 V.
- What is the conversion time of the AD7891-2? The conversion time for the AD7891-2 is 1.6 μs.
- Does the AD7891 have overvoltage protection? Yes, each channel on the AD7891 has overvoltage protection, with the AD7891-1 capable of withstanding overvoltages of ±17 V.
- What are the power consumption modes of the AD7891? The AD7891 operates in normal mode with 82 mW typical power dissipation and in standby mode with 75 mW typical power dissipation.
- What package types are available for the AD7891? The AD7891 is available in 44-terminal MQFP and 44-lead PLCC packages.
- Can the AD7891 be used with both parallel and serial interfaces? Yes, the AD7891 provides options for both parallel and serial interface structures, determined by the MODE pin.
- What are some typical applications of the AD7891? Typical applications include data acquisition systems, motor control systems, mobile communication base stations, and instrumentation.
- How does the AD7891 ensure easy interfacing with other components? The AD7891 has standard control inputs and fast data access times, making it easy to interface with modern microprocessors, microcontrollers, and digital signal processors.
