Overview
The AD7821KN is a high-speed, 8-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is designed to offer improved performance over its predecessor, the AD7820, with a faster conversion time and enhanced signal bandwidth. The AD7821KN is suitable for applications requiring rapid and accurate analog-to-digital conversion, particularly in environments where microprocessor compatibility is essential.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 8 bits |
| Conversion Time | 660 ns (WR-RD mode), 700 ns (RD mode) |
| Signal Bandwidth | 100 kHz |
| Input Ranges | Unipolar and Bipolar |
| Reference Inputs | Ratiometric |
| Operating Temperature Range | -40°C to +85°C |
| Power Supply | ±5 V or single +5 V |
| Power Dissipation | 50 mW |
| Package Types | 20-Lead DIP, SOIC, and 20-Terminal Surface-Mount Packages |
Key Features
- Fast Conversion Time: The AD7821KN features a conversion time of 660 ns in the WR-RD mode and 700 ns in the RD mode, making it suitable for high-speed applications.
- Built-In Track-and-Hold: This ADC includes a built-in track-and-hold function, allowing it to digitize full-scale signals up to 100 kHz without the need for an external track-and-hold circuit.
- Microprocessor Compatibility: The AD7821KN is designed with standard microprocessor control signals (CS, RD, WR, RDY, INT) and latched, three-state data outputs, enabling easy integration with high-speed data buses.
- Low Power Dissipation: The component operates with a low power dissipation of 50 mW, making it energy-efficient.
- Extended Temperature Range: It operates over an extended temperature range of -40°C to +85°C, enhancing its reliability in various environmental conditions.
- No External Clock Required: The half-flash conversion technique eliminates the need for an external clock signal.
Applications
The AD7821KN is versatile and can be used in a variety of applications, including:
- Data acquisition systems requiring high-speed and accurate analog-to-digital conversion.
- Industrial control systems where rapid signal processing is necessary.
- Medical devices that need precise and fast analog signal digitization.
- Aerospace and defense applications where reliability and performance are critical.
- Automotive systems that require robust and high-speed ADCs.
Q & A
- What is the resolution of the AD7821KN ADC?
The AD7821KN has a resolution of 8 bits.
- What is the conversion time of the AD7821KN?
The conversion time is 660 ns in the WR-RD mode and 700 ns in the RD mode.
- Does the AD7821KN require an external clock signal?
No, the half-flash conversion technique eliminates the need for an external clock signal.
- What are the operating temperature ranges for the AD7821KN?
The operating temperature range is -40°C to +85°C.
- Can the AD7821KN operate with a single power supply?
- What is the power dissipation of the AD7821KN?
The power dissipation is 50 mW.
- Does the AD7821KN have built-in track-and-hold functionality?
- Is the AD7821KN compatible with microprocessors?
- What types of input ranges does the AD7821KN support?
- Is the AD7821KN still in production?
