Overview
The AD7870AQ, produced by Analog Devices Inc., is a fast, complete 12-bit analog-to-digital converter (ADC) designed for high-performance applications. This LC2MOS ADC 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 operates from ±5 V power supplies and features a self-contained internal clock, eliminating the need for external clock timing components. The AD7870AQ 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 | Value |
|---|---|
| Number of Bits | 12 |
| Sampling Rate | 100 kHz |
| Input Range | ±3 V |
| Input Type | Single Ended |
| Data Interface | Parallel, Serial |
| Architecture | Successive Approximation (SAR) |
| Reference Type | Internal 3 V Buried Zener |
| Voltage - Supply, Analog | ±5 V |
| Voltage - Supply, Digital | 5 V |
| Operating Temperature | −25°C to +85°C |
| Package / Case | 24-Lead CERDIP |
| Data Access Time | 57 ns |
| Power Consumption | −60 mW typical |
Key Features
- Complete 12-bit ADC on a Chip: Integrates all necessary functions for analog-to-digital conversion, including a track-and-hold amplifier, ADC, and reference on a single chip.
- Dynamic Specifications: Fully specified and tested for ac parameters such as signal-to-noise ratio, harmonic distortion, and intermodulation distortion, making it suitable for DSP applications.
- Fast Microprocessor Interface: Data access times of 57 ns ensure compatibility with modern 8-bit and 16-bit microprocessors and digital signal processors.
- Internal Clock: Self-contained internal clock with the option to override with an external clock if required.
- Multiple Data Output Formats: Supports parallel (12-bit word or two 8-bit bytes) and serial data output formats.
Applications
- Digital Signal Processing (DSP): Ideal for applications requiring high dynamic performance parameters such as signal-to-noise ratio and harmonic distortion.
- Industrial Automation: Suitable for control systems and data acquisition in industrial environments.
- Medical Devices: Can be used in medical equipment requiring precise analog-to-digital conversion.
- Aerospace and Defense: Operates over a wide temperature range, making it suitable for harsh environment applications.
Q & A
- What is the resolution of the AD7870AQ?
The AD7870AQ is a 12-bit analog-to-digital converter.
- What are the input voltage ranges for the AD7870AQ?
The AD7870AQ accepts input signals in the range of ±3 V.
- What is the sampling rate of the AD7870AQ?
The AD7870AQ has a sampling rate of up to 100 kHz.
- Does the AD7870AQ have an internal clock?
Yes, the AD7870AQ has a self-contained internal clock that can be overridden by an external clock if necessary.
- What are the data output formats supported by the AD7870AQ?
The AD7870AQ supports parallel (12-bit word or two 8-bit bytes) and serial data output formats.
- What is the power consumption of the AD7870AQ?
The AD7870AQ typically consumes −60 mW of power.
- What is the operating temperature range of the AD7870AQ?
The AD7870AQ operates over a temperature range of −25°C to +85°C.
- What package types are available for the AD7870AQ?
The AD7870AQ is available in a 24-Lead CERDIP package.
- How fast is the data access time for the AD7870AQ?
The data access time for the AD7870AQ is 57 ns.
- Is the AD7870AQ suitable for DSP applications?
Yes, the AD7870AQ is fully specified and tested for dynamic performance parameters, making it suitable for DSP applications.
