Overview
The AD7820TQ 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 AD7820TQ 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 CerDIP |
| Temperature Range | -55°C to 125°C |
| Input Slew Rate | Less than 100 mV/µs (for internal sample-and-hold) |
Key Features
- High-speed conversion using half-flash technique with 31 comparators and two 4-bit ADCs.
- Internal 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 design with ease of interface.
Applications
- Data acquisition systems.
- High-speed measurement and control systems.
- Embedded systems requiring fast analog-to-digital conversion.
- Aerospace and military applications due to its wide temperature range and reliability.
Q & A
- What is the resolution of the AD7820TQ ADC?
The AD7820TQ has an 8-bit resolution.
- What is the conversion time of the AD7820TQ?
The conversion time is 1.36 µs.
- What is the analog input voltage range of the AD7820TQ?
The analog input voltage range is 0 V to +5 V.
- What type of supply voltage does the AD7820TQ require?
The AD7820TQ requires a single +5 V supply.
- What package types are available for the AD7820TQ?
The AD7820TQ is available in a 20-lead CerDIP package among others.
- What is the temperature range of the AD7820TQ?
The temperature range is -55°C to 125°C.
- Does the AD7820TQ require an external sample-and-hold circuit?
No, it does not require an external sample-and-hold for signals with slew rates less than 100 mV/µs.
- How does the AD7820TQ interface with microprocessors?
The AD7820TQ features latched, three-state output buffer circuitry for direct connection to a microprocessor data bus or system input port.
- Can the AD7820TQ be cascaded for higher resolution?
- What are some typical applications of the AD7820TQ?
Typical applications include data acquisition systems, high-speed measurement and control systems, and aerospace and military applications.
