Overview
The AD7870CQ, produced by Analog Devices Inc., is a fast and complete 12-bit analog-to-digital converter (ADC). This component integrates a track-and-hold amplifier, an 8 μs successive approximation ADC, a 3 V buried Zener reference, and versatile interface logic on a single chip. It features a self-contained internal clock that is laser trimmed for accurate conversion time control, eliminating the need for external clock timing components. The AD7870CQ is designed for easy interfacing with modern microprocessors and digital signal processors due to its fast bus access times and standard control inputs.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 12-bit |
| Conversion Time | 8 μs |
| Input Range | ±3 V |
| Power Supply | ±5 V |
| Data Output Formats | Parallel 12-bit word, two 8-bit bytes, or serial data |
| Data Access Time | 57 ns |
| Package Type | 24-lead CERDIP |
| Operating Temperature Range | -25°C to +85°C |
| Power Consumption | Typically 60 mW |
Key Features
- Complete 12-bit ADC on a single chip, including track-and-hold amplifier, successive approximation ADC, and 3 V buried Zener reference.
- Self-contained internal clock with the option to override with an external clock.
- Fast microprocessor interface with data access times of 57 ns, compatible with modern 8-bit and 16-bit microprocessors and digital signal processors.
- Dynamic performance specifications including signal-to-noise ratio, harmonic distortion, and intermodulation distortion for DSP users.
- Multiple data output formats: parallel 12-bit word, two 8-bit bytes, or serial data.
Applications
The AD7870CQ is suitable for a variety of applications requiring high-speed and accurate analog-to-digital conversion. These include:
- Digital signal processing (DSP) systems where dynamic performance parameters such as signal-to-noise ratio and distortion are critical.
- Industrial control systems that require fast and precise data acquisition.
- Medical devices where high accuracy and reliability in analog-to-digital conversion are essential.
- Aerospace and defense applications where the component's robustness and reliability are paramount.
Q & A
- What is the resolution of the AD7870CQ?
The AD7870CQ has a 12-bit resolution.
- What are the input signal ranges for the AD7870CQ?
The AD7870CQ accepts input signal ranges of ±3 V.
- What are the power supply requirements for the AD7870CQ?
The AD7870CQ operates from ±5 V power supplies.
- What are the data output formats available for the AD7870CQ?
The AD7870CQ offers parallel 12-bit word, two 8-bit bytes, or serial data output formats.
- What is the typical power consumption of the AD7870CQ?
The AD7870CQ typically consumes 60 mW of power.
- What is the operating temperature range of the AD7870CQ?
The AD7870CQ operates within a temperature range of -25°C to +85°C.
- What is the conversion time of the AD7870CQ?
The AD7870CQ has a conversion time of 8 μs.
- Does the AD7870CQ have an internal clock?
Yes, the AD7870CQ features a self-contained internal clock that can be overridden by an external clock if necessary.
- What are the package options for the AD7870CQ?
The AD7870CQ is available in a 24-lead CERDIP package.
- What are some typical applications for the AD7870CQ?
The AD7870CQ is used in DSP systems, industrial control systems, medical devices, and aerospace and defense applications.
