Overview
The AD7891ASZ-1, produced by Analog Devices Inc., is a comprehensive 8-channel, 12-bit high-speed data acquisition system integrated into a single chip. This monolithic device combines an 8-channel multiplexer, a 12-bit analog-to-digital converter (ADC), a 2.5 V reference, and a track/hold amplifier. It is designed to provide signal scaling, multiplexing, track/hold, reference, ADC, and high-speed parallel and serial interface logic functions. The AD7891ASZ-1 operates from a single 5 V supply and is available in a 44-terminal MQFP or 44-lead PLCC package.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 single-ended analog input channels |
| Resolution | 12-bit |
| Conversion Time | 1.6 μs (AD7891-2), 0.6 μs/0.7 μs (AD7891-1 with hardware/software convert start) |
| Sample Rate | Up to 500 kSPS (single channel), up to 62.5 kSPS (channel hopping) |
| Input Ranges | ±5 V, ±10 V (AD7891-1); 0 to +2.5 V, 0 to +5 V, ±2.5 V (AD7891-2) |
| Interface | Parallel and serial interface |
| Power Supply | Single 5 V supply |
| Power Dissipation | 82 mW typical (normal mode), 75 μW typical (standby mode) |
| Package | 44-terminal MQFP, 44-lead PLCC |
Key Features
- Fast 12-bit ADC with conversion times as low as 1.6 μs
- On-chip track/hold amplifier and 2.5 V reference
- Overvoltage protection on each channel (up to ±17 V for AD7891-1)
- Single-supply, low power operation with power-down mode
- Parallel and serial interface options for flexible data transfer
- High dynamic performance including harmonic distortion and signal-to-noise ratio specifications
Applications
- Data acquisition systems
- Motor control systems
- Mobile communication base stations
- Instrumentation and measurement systems
Q & A
- What is the resolution of the AD7891ASZ-1 ADC?
The AD7891ASZ-1 has a resolution of 12 bits. - How many analog input channels does the AD7891ASZ-1 have?
The AD7891ASZ-1 has 8 single-ended analog input channels. - What are the available input voltage ranges for the AD7891ASZ-1?
The input voltage ranges are ±5 V and ±10 V for the AD7891-1, and 0 to +2.5 V, 0 to +5 V, and ±2.5 V for the AD7891-2. - What is the maximum sample rate of the AD7891ASZ-1?
The maximum sample rate is up to 500 kSPS for single-channel sampling and up to 62.5 kSPS for channel hopping. - Does the AD7891ASZ-1 have overvoltage protection?
Yes, each channel has overvoltage protection, with the AD7891-1 capable of withstanding overvoltages up to ±17 V. - What are the power supply requirements for the AD7891ASZ-1?
The AD7891ASZ-1 operates from a single 5 V supply. - What are the typical power dissipation values for the AD7891ASZ-1?
The typical power dissipation is 82 mW in normal mode and 75 μW in standby mode. - What interface options are available for the AD7891ASZ-1?
The AD7891ASZ-1 offers both parallel and serial interface options. - In what packages is the AD7891ASZ-1 available?
The AD7891ASZ-1 is available in a 44-terminal MQFP and a 44-lead PLCC package. - What are some common applications of the AD7891ASZ-1?
Common applications include data acquisition systems, motor control systems, mobile communication base stations, and instrumentation.
