Overview
The AD7822BRZ, produced by Analog Devices Inc., is a high-speed, microprocessor-compatible, 8-bit analog-to-digital converter (ADC). This component is part of the AD7822/AD7825/AD7829 family and is designed for high-performance data acquisition and digital signal processing applications. The AD7822 features a single analog input channel, an on-chip 2.5 V reference, a track-and-hold amplifier, and a fast 8-bit half-flash ADC with a conversion time of 420 ns. It operates from a single supply voltage of 3 V ± 10% or 5 V ± 10% and includes a flexible parallel interface with an end-of-conversion (EOC) pulse for standalone operation.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 1 |
| Resolution | 8 bits |
| Conversion Time | 420 ns |
| Supply Voltage | 3 V ± 10%, 5 V ± 10% |
| Analog Input Range | 0 V to 2 V (VDD = 3 V ± 10%), 0 V to 2.5 V (VDD = 5 V ± 10%) |
| On-Chip Reference | 2.5 V (2% tolerance) |
| Operating Temperature | -40°C to +85°C |
| Package Type | 20-Lead SOIC, PDIP, TSSOP |
Key Features
- Fast conversion time of 420 ns, maximizing DSP processing time in real-time systems.
- Automatic power-down at the end of conversion to reduce power consumption.
- Flexible parallel interface with EOC pulse for standalone operation.
- Analog input span adjustment using the VMID pin, allowing the input span to be centered anywhere in the range AGND to VDD.
- High speed and microprocessor-compatible design.
Applications
- Data acquisition systems.
- DSP front ends.
- Disk drives.
- Mobile communication systems and subsampling applications.
Q & A
- What is the resolution of the AD7822BRZ?
The AD7822BRZ has a resolution of 8 bits. - What is the conversion time of the AD7822BRZ?
The conversion time is 420 ns. - What are the supply voltage options for the AD7822BRZ?
The AD7822BRZ can operate from a single supply voltage of 3 V ± 10% or 5 V ± 10%. - How many analog input channels does the AD7822BRZ have?
The AD7822BRZ has a single analog input channel. - What is the operating temperature range of the AD7822BRZ?
The operating temperature range is -40°C to +85°C. - What types of packages are available for the AD7822BRZ?
The AD7822BRZ is available in 20-Lead SOIC, PDIP, and TSSOP packages. - Does the AD7822BRZ have an on-chip reference voltage?
Yes, the AD7822BRZ has an on-chip reference voltage of 2.5 V with a 2% tolerance. - How can the analog input span be adjusted on the AD7822BRZ?
The analog input span can be adjusted using the VMID pin, allowing the input span to be centered anywhere in the range AGND to VDD. - What is the purpose of the EOC pulse in the AD7822BRZ?
The EOC pulse indicates the end of conversion and allows for standalone operation. - In what types of systems is the AD7822BRZ typically used?
The AD7822BRZ is typically used in data acquisition systems, DSP front ends, disk drives, and mobile communication systems.
