Overview
The AD7891BSZ-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 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 AD7891BSZ-2 model specifically supports input ranges of 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 8 | - |
| Resolution | 12-bit | - |
| Conversion Time | 1.6 ms | ms |
| Acquisition Time | 0.4 ms | ms |
| Sample Rate (Single Channel) | 500 kSPS | kSPS |
| Sample Rate (Channel Hopping) | 62.5 kSPS | kSPS |
| Input Ranges | 0 V to +2.5 V, 0 V to +5 V, ±2.5 V | V |
| Supply Voltage | 5 V ± 5% | V |
| Power Dissipation (Normal Mode) | 82 mW (typ) | mW |
| Power Dissipation (Standby Mode) | 75 μW (typ) | μW |
| Operating Temperature Range | -40 to 85 °C | °C |
| Package Type | 44-Lead MQFP | - |
Key Features
- Fast 12-bit ADC with 1.6 μs conversion time and 0.4 μs acquisition time for the AD7891-2 model.
- Eight single-ended analog input channels with overvoltage protection on each channel, capable of withstanding up to ±17 V for the AD7891-1 model.
- Selection of input ranges: ±5 V and ±10 V for AD7891-1, and 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V for AD7891-2.
- Parallel and serial interface options, determined by the MODE pin.
- On-chip track/hold amplifier and 2.5 V reference.
- Single-supply, low power operation with a power-down mode.
- Standard control inputs and fast data access times for easy interfacing with microprocessors, microcontrollers, and digital signal processors.
Applications
- Data Acquisition Systems
- Motor Control
- Mobile Communication Base Stations
- Instrumentation
Q & A
- What is the resolution of the AD7891BSZ-2 ADC?
The AD7891BSZ-2 has a 12-bit resolution.
- How many analog input channels does the AD7891BSZ-2 have?
The AD7891BSZ-2 has 8 single-ended analog input channels.
- What are the input ranges supported by the AD7891BSZ-2?
The AD7891BSZ-2 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 AD7891BSZ-2?
The conversion time of the AD7891BSZ-2 is 1.6 μs.
- Does the AD7891BSZ-2 have overvoltage protection?
Yes, each channel on the AD7891BSZ-2 has overvoltage protection.
- What are the interface options for the AD7891BSZ-2?
The AD7891BSZ-2 offers both parallel and serial interface options, determined by the MODE pin.
- What is the typical power dissipation of the AD7891BSZ-2 in normal mode?
The typical power dissipation in normal mode is 82 mW.
- What is the typical power dissipation of the AD7891BSZ-2 in standby mode?
The typical power dissipation in standby mode is 75 μW.
- What is the operating temperature range of the AD7891BSZ-2?
The operating temperature range is -40 to 85 °C.
- In what package types is the AD7891BSZ-2 available?
The AD7891BSZ-2 is available in a 44-Lead MQFP package.
