Key facts
- Brand
- Analog Devices
- Model
- AD7574
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-02
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Analog Devices AN-293 Application Note for AD7574 ADC
The document provides an overview of the AD7574, a low-cost 8-bit analog-to-digital converter (ADC) designed for easy interfacing with microprocessors. It utilizes a successive-approximations conversion technique capable of completing an 8-bit A/D conversion in 15 microseconds. The device is controlled via logic inputs labeled CS (Chip Select) and RD (READ), with conversion status indicated by a BUSY output signal.
The note details three primary interface modes for the AD7574: ROM Mode, RAM Mode, and Slow Memory Mode. It explains the basic operation of each mode, including how they simulate memory types like RAM or ROM within a processor's memory map. The document also covers timing considerations, such as the requirement for CS to return HIGH within 250ns after RD goes HIGH in RAM mode, and discusses applications involving range switching using the AD7574's input pins.
Analog Devices AD7574 specifications
| Conversion Time | 15 µs |
|---|---|
| Power Dissipation | 30 mW |
| Supply Voltage | +5 V |
| Clock Frequency | 500 kHz |
All Analog Devices AD7574 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
How long does an 8-bit A/D conversion take to complete?
The device can complete an 8-bit A/D conversion in 15 microseconds.
What is the maximum guaranteed value for the internal reset cycle duration?
The maximum value for the internal reset cycle is 250ns at 25°C.
How long does a conversion take?
The conversion time is 15 µs.
What supply voltage does the AD7574 require?
It operates from a single +5 V supply.