Overview
The AD7820LRZ is a high-speed, 8-bit analog-to-digital converter (ADC) produced 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 AD7820LRZ 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 Type | 20-Lead SOIC (Wide) |
| Temperature Range | -40°C to +85°C |
| Input Slew Rate | Less than 100 mV/µs |
Key Features
- High-speed conversion using half-flash technique with 31 comparators and two 4-bit ADCs.
- Input sampling circuitry eliminates the need for an external sample-and-hold for signals with slew rates less than 100 mV/µs.
- Latched, three-state output buffer circuitry for direct connection to microprocessor data bus or system input port.
- Non-three state overflow output for cascading devices to achieve higher resolution.
- Microprocessor-compatible interface, appearing as a memory location or I/O port without external interfacing logic.
Applications
The AD7820LRZ is suitable for various high-speed data acquisition applications, including:
- Industrial control systems.
- Medical devices.
- Aerospace and defense systems.
- Automotive systems.
- High-speed data logging and monitoring systems.
Q & A
- What is the resolution of the AD7820LRZ ADC?
The AD7820LRZ has an 8-bit resolution. - What is the conversion time of the AD7820LRZ?
The conversion time is 1.36 µs. - What is the analog input voltage range of the AD7820LRZ?
The analog input voltage range is 0 V to +5 V. - Does the AD7820LRZ require an external sample-and-hold circuit?
No, the input sampling circuitry eliminates the need for an external sample-and-hold for signals with slew rates less than 100 mV/µs. - How does the AD7820LRZ interface with microprocessors?
The AD7820LRZ features latched, three-state output buffer circuitry that allows direct connection to a microprocessor data bus or system input port. - What is the package type of the AD7820LRZ?
The package type is 20-Lead SOIC (Wide). - What is the temperature range of the AD7820LRZ?
The temperature range is -40°C to +85°C. - Can the AD7820LRZ be cascaded for higher resolution?
- What are some typical applications of the AD7820LRZ?
The AD7820LRZ is used in industrial control systems, medical devices, aerospace and defense systems, automotive systems, and high-speed data logging and monitoring systems.- What is the supply voltage requirement for the AD7820LRZ?
The supply voltage is +5 V. - What are some typical applications of the AD7820LRZ?
