Overview
The AD7822BR is a high-speed, 8-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. This device is part of the AD7822/AD7825/AD7829 family, which offers microprocessor-compatible ADCs with multiple channel configurations. The AD7822BR specifically features a single analog input channel and is designed for high-throughput applications.
Key Specifications
| Parameter | Description |
|---|---|
| Resolution | 8 bits |
| Sampling Rate | Up to 2 MSPS |
| Supply Voltage | 3 V ± 10% and 5 V ± 10% |
| Input Range | 0 V to 2 V p-p (VDD = 3 V ± 10%), 0 V to 2.5 V p-p (VDD = 5 V ± 10%) |
| Conversion Time | 420 ns |
| Interface | Parallel with EOC pulse |
| Package | 20-lead TSSOP, 20-lead SOIC, 20-lead PDIP |
| Operating Temperature | -40°C to +85°C |
| RoHS Compliance | Yes (for certain packages) |
Key Features
- Fast Conversion Time: The AD7822BR has a conversion time of 420 ns, maximizing DSP processing time in real-time systems.
- Analog Input Span Adjustment: The VMID pin allows users to offset the input span, reducing the need for external amplifiers.
- Automatic Power-Down: The device features automatic power-down at the end of conversion to conserve power.
- Flexible Parallel Interface: Includes an EOC (End of Conversion) pulse for standalone operation.
- On-Chip Reference: A 2.5 V on-chip reference with a 2% tolerance is included.
- Track-and-Hold Amplifier: An integrated track-and-hold amplifier ensures accurate sampling.
Applications
- Data acquisition systems
- DSP front ends
- Disk drives
- Mobile communication systems
- Subsampling applications
Q & A
- What is the resolution of the AD7822BR ADC?
The AD7822BR has an 8-bit resolution.
- What is the maximum sampling rate of the AD7822BR?
The maximum sampling rate is up to 2 MSPS.
- What are the supply voltage options for the AD7822BR?
The device can operate from a single 3 V ± 10% or 5 V ± 10% supply.
- How many analog input channels does the AD7822BR have?
The AD7822BR has a single analog input channel.
- What is the conversion time of the AD7822BR?
The conversion time is 420 ns.
- Does the AD7822BR have an on-chip reference voltage?
Yes, it includes a 2.5 V on-chip reference with a 2% tolerance.
- What types of packages are available for the AD7822BR?
The device is available in 20-lead TSSOP, 20-lead SOIC, and 20-lead PDIP packages.
- Is the AD7822BR RoHS compliant?
Yes, certain packages of the AD7822BR are RoHS compliant.
- What is the operating temperature range of the AD7822BR?
The operating temperature range is -40°C to +85°C.
- What kind of interface does the AD7822BR use?
The device uses a parallel interface with an EOC pulse.
