Overview
The AD7870TQ, 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, an 8 μs successive approximation ADC, a 3 V buried Zener reference, and versatile interface logic. The AD7870TQ is designed to operate with modern microprocessors and digital signal processors, offering fast bus access times and standard control inputs.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Bits | 12 |
| Input Range | ±3 V |
| Conversion Time | 8 μs |
| Data Output Formats | Parallel (12-bit word), Two 8-bit bytes, Serial data |
| Data Access Time | 57 ns |
| Power Supply | ±5 V (Analog), 5 V (Digital) |
| Operating Temperature | -55°C to +125°C |
| Package Type | 24-Lead CERDIP |
| Input Resistance | Typically 15 kΩ |
Key Features
- Complete 12-bit ADC on a Chip: Integrates track-and-hold amplifier, successive approximation ADC, and internal reference on a single chip.
- Dynamic Specifications: Fully specified and tested for ac 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.
- Internal Clock: Self-contained internal clock with the option to be overridden by an external clock if required.
- Versatile Interface Logic: Offers a choice of three data output formats: parallel, two 8-bit bytes, or serial data.
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 precise analog-to-digital conversion and fast data transfer rates.
- Medical Devices: Applicable in medical equipment where accurate and fast data conversion is critical.
- Aerospace and Defense: Operates over a wide temperature range, making it suitable for harsh environment applications.
Q & A
- What is the resolution of the AD7870TQ ADC?
The AD7870TQ is a 12-bit analog-to-digital converter.
- What are the input voltage ranges for the AD7870TQ?
The AD7870TQ accepts input signals in the range of ±3 V.
- What is the conversion time of the AD7870TQ?
The conversion time is 8 μs.
- What are the available data output formats for the AD7870TQ?
The data output formats include a single parallel 12-bit word, two 8-bit bytes, or serial data.
- What is the typical data access time for the AD7870TQ?
The data access time is 57 ns.
- What power supplies are required for the AD7870TQ?
The AD7870TQ operates from ±5 V (analog) and 5 V (digital) power supplies.
- What is the operating temperature range of the AD7870TQ?
The operating temperature range is -55°C to +125°C.
- What type of package is the AD7870TQ available in?
The AD7870TQ is available in a 24-Lead CERDIP package.
- Does the AD7870TQ have an internal clock?
Yes, the AD7870TQ has a self-contained internal clock that can be overridden by an external clock if needed.
- What is the input resistance of the AD7870TQ?
The input resistance is typically 15 kΩ.
