Overview
The AD7820CQ is a high-speed, 8-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. This microprocessor-compatible ADC utilizes a half-flash conversion technique, enabling a conversion time of 1.36 µs. It operates with a single +5 V supply and has an analog input voltage range of 0 V to +5 V. The AD7820CQ is designed for ease of integration with microprocessors, featuring latched, three-state output buffer circuitry that allows direct connection to a microprocessor data bus or system input port.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 8 bits |
| Conversion Time | 1.36 µs |
| Analog Input Voltage Range | 0 V to +5 V |
| Supply Voltage | +5 V |
| Package Types | 20 ld CerDIP, 20-Lead PDIP, 20-Lead Flatpack, 20-Lead SOIC (Wide) |
| Operating Temperature Range | -40°C to 85°C |
| Input Sampling Circuitry | Tracks and holds input signals with slew rates less than 100 mV/µs |
Key Features
- High-speed conversion using half-flash technique with 31 comparators and two 4-bit ADCs.
- Microprocessor-compatible with latched, three-state output buffer circuitry.
- No external sample-and-hold circuit required for signals with slew rates less than 100 mV/µs.
- Non-three state overflow output for cascading devices to achieve higher resolution.
- Single +5 V supply operation.
Applications
The AD7820CQ is suitable for various high-speed data acquisition applications, including:
- Industrial control systems.
- Medical devices requiring fast and accurate analog-to-digital conversion.
- Aerospace and defense systems where high reliability and speed are critical.
- Automotive systems needing rapid data conversion.
- Embedded systems and microcontroller-based projects.
Q & A
- What is the resolution of the AD7820CQ ADC?
The AD7820CQ has a resolution of 8 bits. - What is the conversion time of the AD7820CQ?
The conversion time is 1.36 µs. - What is the analog input voltage range of the AD7820CQ?
The analog input voltage range is 0 V to +5 V. - Does the AD7820CQ require an external sample-and-hold circuit?
No, it does not require an external sample-and-hold circuit for signals with slew rates less than 100 mV/µs. - What are the package options available for the AD7820CQ?
The AD7820CQ is available in 20 ld CerDIP, 20-Lead PDIP, 20-Lead Flatpack, and 20-Lead SOIC (Wide) packages. - What is the operating temperature range of the AD7820CQ?
The operating temperature range is -40°C to 85°C. - Can the AD7820CQ be cascaded for higher resolution?
Yes, the AD7820CQ has a non-three state overflow output that allows cascading of devices to achieve higher resolution. - What is the supply voltage requirement for the AD7820CQ?
The AD7820CQ operates with a single +5 V supply. - Is the AD7820CQ compatible with microprocessors?
Yes, the AD7820CQ is microprocessor-compatible with latched, three-state output buffer circuitry. - What are some typical applications of the AD7820CQ?
The AD7820CQ is used in industrial control systems, medical devices, aerospace and defense systems, automotive systems, and embedded systems.
