Overview
The AD7870KP, produced by Analog Devices Inc., is a fast and complete 12-bit analog-to-digital converter (ADC). This component integrates all necessary functions for analog-to-digital conversion on a single chip, including a track-and-hold amplifier, a successive approximation ADC, and a 3 V buried Zener reference. The AD7870KP operates from ±5 V power supplies and features a self-contained internal clock, eliminating the need for external clock timing components. However, an external clock can override the internal clock if required. The converter supports multiple data output formats, including a single 12-bit parallel word, two 8-bit bytes, or serial data, making it compatible with modern microprocessors and digital signal processors.
Key Specifications
| Parameter | Specification |
|---|---|
| Number of Bits | 12 |
| Input Voltage Range | ±3 V |
| Input Resistance | Typically 15 kΩ |
| Power Supply | ±5 V (Analog), 5 V (Digital) |
| Operating Temperature | 0°C to +70°C |
| Conversion Time | 8 μs (successive approximation ADC) |
| Data Access Time | 57 ns |
| Package Type | 28-Lead PLCC (AD7870KP) |
| Power Consumption | Typically 60 mW |
Key Features
- Complete 12-bit ADC on a Chip: Integrates a track-and-hold amplifier, successive approximation ADC, and a 3 V buried Zener reference.
- Dynamic Performance: Fully specified for dynamic performance parameters including signal-to-noise ratio, harmonic distortion, and intermodulation distortion.
- Fast Microprocessor Interface: Data access times of 57 ns, compatible with modern 8-bit and 16-bit microprocessors and digital signal processors.
- Flexible Data Output Formats: Supports single 12-bit parallel word, two 8-bit bytes, or serial data output.
- Internal Clock: Self-contained internal clock, with the option to override with an external clock.
Applications
- Digital Signal Processing (DSP): Suitable for applications requiring high dynamic performance parameters such as signal-to-noise ratio and harmonic distortion.
- Industrial Automation: Used in systems that require fast and accurate analog-to-digital conversion.
- Medical Devices: Applicable in medical equipment that demands precise and reliable ADCs.
- Aerospace and Defense: Utilized in various military and aerospace applications due to its robust specifications and reliability.
Q & A
- What is the input voltage range of the AD7870KP?
The AD7870KP accepts input signals in the range of ±3 V.
- What is the typical power consumption of the AD7870KP?
The typical power consumption is 60 mW.
- What are the available data output formats for the AD7870KP?
The AD7870KP supports single 12-bit parallel word, two 8-bit bytes, or serial data output.
- Does the AD7870KP require an external clock?
No, it has a self-contained internal clock, but it can be overridden by an external clock if needed.
- What is the operating temperature range of the AD7870KP?
The operating temperature range is 0°C to +70°C.
- What is the conversion time of the AD7870KP?
The conversion time is 8 μs using a successive approximation ADC.
- What is the data access time of the AD7870KP?
The data access time is 57 ns.
- In what package type is the AD7870KP available?
The AD7870KP is available in a 28-Lead PLCC package.
- Is the AD7870KP suitable for high-speed applications?
Yes, it is suitable for high-speed applications due to its fast conversion and data access times.
- What are some common applications of the AD7870KP?
Common applications include DSP, industrial automation, medical devices, and aerospace and defense.
