Overview
The AD7870BQ, produced by Analog Devices Inc., is a fast, complete 12-bit analog-to-digital converter (ADC) that integrates all necessary functions for analog-to-digital conversion on a single chip. This includes a track-and-hold amplifier, an 8 μs successive approximation ADC, a 3 V buried Zener reference, and versatile interface logic. The ADC is designed to operate from ±5 V power supplies and features a self-contained internal clock, eliminating the need for external clock timing components. It supports various 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 | Value |
|---|---|
| Number of Bits | 12 |
| Input Range | ±3 V |
| Sampling Rate | 100 kHz |
| Data Access Time | 57 ns |
| Power Consumption | 60 mW typical |
| Operating Temperature | −25°C to +85°C |
| Package Type | 24-Lead CERDIP |
| Reference Type | Internal 3 V buried Zener reference |
| Supply Voltage | ±5 V (analog), 5 V (digital) |
| Architecture | Successive Approximation (SAR) |
Key Features
- Complete 12-bit ADC on a single chip, including track-and-hold amplifier, ADC, and reference.
- Self-contained internal clock with the option to override with an external clock.
- Supports multiple data output formats: parallel 12-bit word, two 8-bit bytes, or serial data.
- Fast bus access times, ensuring compatibility with modern microprocessors and digital signal processors.
- Internal 3 V buried Zener reference, factory trimmed to ±10 mV.
- Dynamic specifications for DSP users, including signal-to-noise ratio, harmonic distortion, and intermodulation distortion.
Applications
The AD7870BQ is suitable for a variety of applications requiring high-speed and accurate analog-to-digital conversion. These include:
- Digital signal processing (DSP) systems.
- Industrial control systems.
- Medical devices requiring precise analog-to-digital conversion.
- Aerospace and defense applications where high reliability and accuracy are crucial.
- Data acquisition systems in various industries.
Q & A
- What is the resolution of the AD7870BQ ADC?
The AD7870BQ has a resolution of 12 bits. - What are the input voltage ranges for the AD7870BQ?
The AD7870BQ accepts input signals in the range of ±3 V. - What is the sampling rate of the AD7870BQ?
The AD7870BQ has a sampling rate of up to 100 kHz. - What is the typical power consumption of the AD7870BQ?
The typical power consumption is 60 mW. - What types of data output formats does the AD7870BQ support?
The AD7870BQ supports parallel 12-bit word, two 8-bit bytes, or serial data output formats. - Does the AD7870BQ have an internal clock?
Yes, the AD7870BQ has a self-contained internal clock that can be overridden by an external clock if necessary. - What is the operating temperature range of the AD7870BQ?
The operating temperature range is −25°C to +85°C. - What type of package is the AD7870BQ available in?
The AD7870BQ is available in a 24-Lead CERDIP package. - What is the reference type used in the AD7870BQ?
The AD7870BQ uses an internal 3 V buried Zener reference. - What are the supply voltage requirements for the AD7870BQ?
The AD7870BQ operates from ±5 V (analog) and 5 V (digital) power supplies.
