Overview
The AD7890BR-10, produced by Analog Devices Inc., is an 8-channel, 12-bit serial 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), a 2.5 V reference, and a high-speed serial interface. It operates from a single 5 V supply and supports various analog input ranges, including ±10 V for the AD7890-10 model. The device is designed for low-power operation, with a typical power consumption of 30 mW in normal mode and 75 μW in standby mode.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Number of Channels | 8 | - | Single-ended analog input channels |
| Resolution | 12-bit | - | - |
| Conversion Time | 5.9 μs | μs | fCLK IN = 2.5 MHz, MUX OUT connected to SHA IN |
| Analog Input Range | ±10 V | V | For AD7890-10 model |
| Supply Voltage | 5 V ± 5% | V | For specified performance |
| Power Consumption (Normal Mode) | 10 mA max | mA | Typically 30 mW |
| Power Consumption (Standby Mode) | 15 μA typ | μA | @ 25°C |
| Logic Input High Voltage | 2.4 V min | V | VDD = 5 V ± 5% |
| Logic Input Low Voltage | 0.8 V max | V | VDD = 5 V ± 5% |
| Output High Voltage | 4.0 V min | V | ISOURCE = 200 μA |
| Output Low Voltage | 0.4 V max | V | ISINK = 1.6 mA |
Key Features
- Fast 12-bit ADC with a conversion time of 5.9 μs
- Eight single-ended analog input channels with selectable input ranges (±10 V, 0 V to 4.096 V, 0 V to 2.5 V)
- On-chip track/hold amplifier and 2.5 V reference
- High-speed, flexible, serial interface for easy interfacing with microcontrollers and digital signal processors
- Independently accessible multiplexer allowing for external antialiasing filters or signal conditioning
- Single supply, low-power operation with a power-down mode for reduced power consumption
- On-chip control register for channel selection, conversion start, and power-down via the serial port
Applications
The AD7890BR-10 is suitable for various applications requiring multi-channel data acquisition, such as:
- Industrial control systems
- Medical devices
- Aerospace and defense systems
- Automotive systems
- Test and measurement equipment
Q & A
- What is the resolution of the AD7890BR-10 ADC?
The AD7890BR-10 has a 12-bit resolution.
- What are the available analog input ranges for the AD7890BR-10?
The available analog input ranges are ±10 V, 0 V to 4.096 V, and 0 V to 2.5 V.
- What is the conversion time of the AD7890BR-10?
The conversion time is 5.9 μs with fCLK IN = 2.5 MHz.
- Can the multiplexer be accessed independently?
- What is the power consumption in normal and standby modes?
In normal mode, the power consumption is typically 30 mW, and in standby mode, it is 75 μW at 25°C.
- What type of serial interface does the AD7890BR-10 use?
The AD7890BR-10 uses a high-speed, flexible, serial interface.
- Can the AD7890BR-10 be powered down to reduce power consumption?
- What is the supply voltage for the AD7890BR-10?
The supply voltage is 5 V ± 5%.
- What are some typical applications for the AD7890BR-10?
Typical applications include industrial control systems, medical devices, aerospace and defense systems, automotive systems, and test and measurement equipment.
- How many logic input channels does the AD7890BR-10 have?
The AD7890BR-10 does not have separate logic input channels; it uses a serial interface for control and data transfer.
