Overview
The AD774BBD is a complete 12-bit successive approximation analog-to-digital converter (ADC) produced by Analog Devices Inc. This monolithic IC integrates a high-precision voltage reference and clock, making it a self-contained solution for analog-to-digital conversion. The AD774BBD is designed to interface directly with 8- and 16-bit microprocessor buses, offering faster conversion times and lower power consumption compared to its predecessors like the AD574A.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 12 bits |
| Conversion Time | 8 µs (maximum) |
| Temperature Range | –40°C to +85°C (A and B grades), –55°C to +125°C (T grade) |
| Power Supplies | +5 V, ±12 V or ±15 V |
| Package Type | 28-lead hermetically sealed ceramic DIP |
| Analog Input Ranges | 0 V to 10 V, 0 V to 20 V (unipolar); –5 V to +5 V, –10 V to +10 V (bipolar) |
| Digital Interface | Three-state output buffer, compatible with 8- and 16-bit microprocessor buses |
Key Features
- Industry standard pinout compatible with AD574A, but with faster conversion times and lower power consumption.
- High-precision voltage reference and clock integrated on-chip.
- Active laser trimming of thin-film resistors to minimize offset, linearity, and scaling errors.
- Flexible digital interface with multiple-mode three-state output buffers for direct connection to most microprocessors.
- Monolithic design using Analog Devices’ BiMOS II process, combining high-performance bipolar analog circuitry with digital CMOS logic.
Applications
The AD774BBD is suitable for a variety of applications requiring high-precision analog-to-digital conversion, such as industrial control systems, medical devices, data acquisition systems, and any environment where accurate and fast analog-to-digital conversion is necessary.
Q & A
- What is the resolution of the AD774BBD?
The AD774BBD has a resolution of 12 bits. - What is the maximum conversion time of the AD774BBD?
The maximum conversion time is 8 µs. - What are the available temperature ranges for the AD774BBD?
The temperature ranges are –40°C to +85°C (A and B grades) and –55°C to +125°C (T grade). - What power supplies are required for the AD774BBD?
The AD774BBD requires +5 V and ±12 V or ±15 V power supplies. - In what package types is the AD774BBD available?
The AD774BBD is available in a 28-lead hermetically sealed ceramic DIP. - What are the analog input ranges for the AD774BBD?
The analog input ranges are 0 V to 10 V, 0 V to 20 V (unipolar); –5 V to +5 V, –10 V to +10 V (bipolar). - How does the AD774BBD interface with microprocessors?
The AD774BBD has a three-state output buffer and interface logic that allows direct connection to most microprocessors. - What process is used in the monolithic design of the AD774BBD?
The monolithic design uses Analog Devices’ BiMOS II process, combining high-performance bipolar analog circuitry with digital CMOS logic. - How are errors minimized in the AD774BBD?
Errors are minimized by active laser trimming of thin-film resistors. - Is the AD774BBD compatible with any industry standards?
Yes, the AD774BBD is pin-compatible with the industry standard AD574A.
