Overview
The AD7825BR is a high-speed, 4-channel, microprocessor-compatible, 8-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is part of the AD7822/AD7825/AD7829 family and is designed for applications requiring fast conversion times and high accuracy. The AD7825BR features an on-chip reference, a track-and-hold amplifier, and a half-flash ADC, making it suitable for various data acquisition and signal processing tasks.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 4 |
| Resolution | 8-bit |
| Conversion Time | 420 ns |
| Input Ranges | 0 V to 2 V p-p (VDD = 3 V ± 10%), 0 V to 2.5 V p-p (VDD = 5 V ± 10%) |
| Supply Voltage | 3 V ± 10%, 5 V ± 10% |
| Operating Temperature | −40°C to +85°C |
| Package Type | 24-Lead SOIC_W |
| Accuracy | ±0.75 LSB |
Key Features
- Fast Conversion Time: The AD7825BR has a conversion time of 420 ns, which maximizes DSP processing time in real-time systems.
- Analog Input Span Adjustment: The VMID pin allows users to offset the input span, enhancing flexibility in various applications.
- Automatic Power-Down: The device features automatic power-down at the end of conversion, reducing power consumption.
- Flexible Parallel Interface: The AD7825BR includes a flexible parallel interface with an EOC (End of Conversion) pulse, enabling standalone operation.
- On-Chip Reference: The device includes an on-chip 2.5 V reference with a 2% tolerance.
Applications
- Data acquisition systems
- DSP front ends
- Disk drives
- Mobile communication systems
- Subsampling applications
Q & A
- What is the resolution of the AD7825BR?
The AD7825BR has an 8-bit resolution.
- What is the conversion time of the AD7825BR?
The conversion time is 420 ns.
- What are the input voltage ranges for the AD7825BR?
The input ranges are 0 V to 2 V p-p for VDD = 3 V ± 10% and 0 V to 2.5 V p-p for VDD = 5 V ± 10%.
- What is the operating temperature range of the AD7825BR?
The operating temperature range is −40°C to +85°C.
- What type of package is the AD7825BR available in?
The AD7825BR is available in a 24-Lead SOIC_W package.
- Does the AD7825BR have an on-chip reference?
Yes, the AD7825BR includes an on-chip 2.5 V reference with a 2% tolerance.
- What is the purpose of the VMID pin on the AD7825BR?
The VMID pin allows users to offset the input span, enhancing flexibility in various applications.
- Does the AD7825BR support automatic power-down?
Yes, the device features automatic power-down at the end of conversion.
- What types of applications is the AD7825BR suitable for?
The AD7825BR is suitable for data acquisition systems, DSP front ends, disk drives, mobile communication systems, and subsampling applications.
- What is the accuracy of the AD7825BR?
The accuracy is ±0.75 LSB.
