Overview
The AD7891ASZ-2 is a high-performance, 8-channel, 12-bit data acquisition system produced by Analog Devices Inc. This integrated circuit combines 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. The AD7891ASZ-2 operates from a single 5 V supply and offers flexible analog input ranges, including 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V. It 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 | Unit |
|---|---|---|
| Resolution | 12 | bits |
| Number of Channels | 8 | - |
| Conversion Time | 1.6 | ms |
| Acquisition Time | 0.4 | ms |
| Sampling Rate | 500 kSPS | - |
| Voltage Supply | 5 | V |
| Power Dissipation (Normal Mode) | 82 | mW |
| Power Dissipation (Standby Mode) | 75 | mW |
| Operating Temperature | -40°C to 85°C | - |
| Package Type | 44-MQFP | - |
Key Features
- Fast 12-bit ADC with a conversion time of 1.6 ms and an acquisition time of 0.4 ms.
- 8 single-ended analog input channels with overvoltage protection on each channel.
- Selection of input ranges: 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V for the AD7891-2 model.
- Parallel and serial interface options, configurable via the MODE pin.
- On-chip track/hold amplifier and 2.5 V reference.
- Single-supply, low power operation with a power-down mode.
- High-speed performance with a sampling rate of up to 500 kSPS.
- Surface mount 44-QFP package with tape and reel (TR) packaging for automated assembly.
Applications
- Data Acquisition Systems
- Motor Control Systems
- Mobile Communication Base Stations
- Instrumentation and Measurement Systems
Q & A
- What is the resolution of the AD7891ASZ-2 ADC?
The AD7891ASZ-2 has a 12-bit resolution.
- How many analog input channels does the AD7891ASZ-2 have?
The AD7891ASZ-2 has 8 single-ended analog input channels.
- What are the available input ranges for the AD7891ASZ-2?
The AD7891ASZ-2 offers input ranges of 0 V to +2.5 V, 0 V to +5 V, and ±2.5 V.
- What types of interfaces does the AD7891ASZ-2 support?
The AD7891ASZ-2 supports both parallel and serial interfaces, configurable via the MODE pin.
- What is the typical power dissipation of the AD7891ASZ-2 in normal mode?
The typical power dissipation in normal mode is 82 mW.
- What is the operating temperature range of the AD7891ASZ-2?
The operating temperature range is -40°C to 85°C.
- What package types are available for the AD7891ASZ-2?
The AD7891ASZ-2 is available in a 44-MQFP package.
- Does the AD7891ASZ-2 have overvoltage protection?
Yes, each channel on the AD7891ASZ-2 has overvoltage protection.
- What is the maximum sampling rate of the AD7891ASZ-2?
The maximum sampling rate is 500 kSPS.
- Is the AD7891ASZ-2 RoHS compliant?
Yes, the AD7891ASZ-2 is lead-free and RoHS compliant.
