Overview
The AD7859AS is a high-speed, low-power, 8-channel, 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is optimized for speed and operates from a single 3 V or 5 V power supply. It features self-calibration and system calibration options to ensure accurate operation over time and temperature. The AD7859AS is part of the AD7859 family, which includes the AD7859L, optimized for low power consumption.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 12 bits |
| Sampling Rate | 200 kSPS |
| Input Voltage Range | 0 to VREF (unipolar), -VREF/2 to +VREF/2 (bipolar) |
| Power Supply | 3 V or 5 V single supply |
| Power Consumption (Normal Operation) | 15 mW (VDD = 3 V) |
| Power Consumption (Power-Down Mode) | 1.3 mW (VDD = 3 V, 10 kSPS) |
| Input Signal Acquisition Time | 500 ns |
| Output Coding | Straight binary and 2's complement |
| Interface | Flexible parallel interface: 16-bit parallel/8-bit parallel |
| Package | 44-pin PQFP and PLCC |
Key Features
- High-speed operation with a throughput rate of 200 kHz
- Low power consumption with automatic power-down options
- Self-calibration and system calibration for accurate operation
- Pseudo-differential sampling scheme
- CMOS construction for low power dissipation
- Flexible parallel interface for easy integration
- Multiple power-down options for low power applications
- On-chip registers for control, status, and calibration
Applications
- Battery-powered systems (personal digital assistants, medical instruments, mobile communications)
- Pen computers
- Instrumentation and control systems
- High-speed modems
Q & A
- What is the resolution of the AD7859AS?
The AD7859AS has a resolution of 12 bits. - What is the maximum sampling rate of the AD7859AS?
The maximum sampling rate is 200 kSPS. - What are the power supply options for the AD7859AS?
The device operates from a single 3 V or 5 V power supply. - How much power does the AD7859AS consume in normal operation?
In normal operation, it consumes typically 15 mW at VDD = 3 V. - What is the input signal acquisition time for the AD7859AS?
The input signal acquisition time is 500 ns. - What types of output coding does the AD7859AS support?
The device supports straight binary and 2's complement output coding. - What types of interfaces are available on the AD7859AS?
The device features a flexible parallel interface: 16-bit parallel/8-bit parallel. - In what packages is the AD7859AS available?
The device is available in 44-pin PQFP and PLCC packages. - What are some common applications of the AD7859AS?
Common applications include battery-powered systems, pen computers, instrumentation and control systems, and high-speed modems. - Does the AD7859AS support self-calibration and system calibration?
Yes, the device supports both self-calibration and system calibration.
