Overview
The AD7890BR-4, produced by Analog Devices Inc., is an 8-channel, 12-bit serial data acquisition system. This component is fabricated using Analog Devices' Linear Compatible CMOS (LC2MOS) process, which combines precision bipolar and CMOS technologies. The AD7890BR-4 includes an input multiplexer, an on-chip track/hold amplifier, a high-speed 12-bit ADC, a 2.5 V reference, and a high-speed serial interface. It operates from a single 5 V supply and supports an analog input range of 0 V to 4.096 V.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Number of Channels | 8 | ||
| Resolution | 12-bit | ||
| Analog Input Range | 0 V to 4.096 V | V | |
| Supply Voltage | 5 V ± 5% | V | |
| Power Dissipation (Normal Mode) | 50 mW max (typically 30 mW) | mW | |
| Power Dissipation (Standby Mode) | 75 μW typ | μW | |
| Conversion Time | 5.9 μs max | μs | fCLK IN = 2.5 MHz |
| Track/Hold Acquisition Time | 2 μs max | μs | |
| Reference Voltage | 2.5 V ± 5% | V | |
| Reference Output Impedance | 2 kΩ nom | kΩ |
Key Features
- High-speed, flexible serial interface for easy interfacing with microcontrollers and digital signal processors.
- On-chip reference with an output voltage of 2.5 V.
- Independently accessible multiplexer allowing for the insertion of antialiasing filters or signal conditioning between the multiplexer and the ADC.
- Single supply, low-power operation with a power-down mode for reduced power consumption.
- High dynamic performance including specifications for harmonic distortion and signal-to-noise ratio.
- Support for various package types including PDIP, SOIC, and CerDIP.
Applications
- Data acquisition systems in industrial, medical, and scientific instruments.
- Automotive and aerospace applications requiring multiple channel data acquisition.
- Embedded systems and IoT devices needing high-speed, low-power data conversion.
- Test and measurement equipment where precision and flexibility are crucial.
Q & A
- What is the resolution of the AD7890BR-4?
The AD7890BR-4 has a resolution of 12 bits.
- What are the available analog input ranges for the AD7890BR-4?
The AD7890BR-4 supports an analog input range of 0 V to 4.096 V.
- What is the supply voltage for the AD7890BR-4?
The AD7890BR-4 operates from a single 5 V supply ± 5%.
- How much power does the AD7890BR-4 consume in normal mode?
The power dissipation in normal mode is 50 mW maximum, typically 30 mW.
- Can the AD7890BR-4 be placed in a power-down mode?
- What is the conversion time of the AD7890BR-4?
The conversion time is 5.9 μs maximum at fCLK IN = 2.5 MHz.
- How does the AD7890BR-4 handle channel selection?
Channel selection is controlled via the on-chip control register accessible through the serial interface.
- Can an external reference be used with the AD7890BR-4?
- What types of packages are available for the AD7890BR-4?
The AD7890BR-4 is available in various packages including PDIP, SOIC, and CerDIP.
- Is the AD7890BR-4 suitable for high-speed applications?
