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Understanding the AD664BD-UNI DAC
The AD664BD-UNI is a single-chip IC that boasts four complete 12-bit voltage output Digital-to-Analog Converters (DACs). Each DAC is equipped with a dual-buffered input latch structure and data readback functionality. All DAC read/write operations are conducted through a microprocessor-compatible input/output (I/O) port. The I/O port supports 4-bit, 8-bit, or 12-bit parallel words, allowing for simple interfacing with various microprocessors. A reset to zero control pin allows users to simultaneously reset all DAC outputs to zero, regardless of the content of the input latches. Any one or all DACs can be placed in transparent mode, enabling immediate response of the output to input data. The analog portion of the AD664 consists of four DAC units, four output amplifiers, one control amplifier, and switches. Each DAC unit is of the reverse R-2R type. The output currents of each DAC unit are switched to on-chip application resistors and output amplifiers. The output range of each DAC unit is programmable through the digital input/output port and can be set to single-ended (UNI) or differential (BIP) ranges, with gains of one or two times the reference voltage. All DACs are powered by a single external reference voltage source. The functionality of the AD664 is attributed to Analog Devices Inc.’s BiMOS II process, laser-trimmed thin-film resistors, and double-layer metal interconnects.
Features and Specifications
The AD664BD-UNI is designed to provide high performance and flexibility in various applications. Here are some of its key features and specifications:
– Four independent 12-bit DACs- Dual-buffered input latches with data readback- Microprocessor-compatible I/O port- Support for 4-bit, 8-bit, or 12-bit parallel words- Reset to zero control pin- Transparent mode for immediate response- Single-ended (UNI) or differential (BIP) output ranges- Gain of one or two times the reference voltage- Single external reference voltage source- BiMOS II process, laser-trimmed thin-film resistors, and double-layer metal interconnects
Applications
The AD664BD-UNI is suitable for a wide range of applications, including:
– Data acquisition systems- Signal processing- Audio and video equipment- Industrial control systems- Telecommunications- Medical equipment
Comparison with Other DACs
To better understand the AD664BD-UNI, let’s compare it with some other DACs in the market:
| DAC Model | Bits | Channels | Interface | Power Supply | Application ||———–|——|———-|———–|————–|————-|| AD664BD-UNI | 12 | 4 | Parallel | Single | Data acquisition, signal processing, audio/video, industrial control, telecommunications, medical equipment || AD1674KNZ | 14 | 1 | Parallel | Single | Data acquisition, signal processing, audio/video, industrial control, telecommunications, medical equipment || AD7582KNZ | 8 | 2 | Parallel | Single | Data acquisition, signal processing, audio/video, industrial control, telecommunications, medical equipment || AD667JNZ | 12 | 1 | Parallel | Single | Data acquisition, signal processing, audio/video, industrial control, telecommunications, medical equipment |
As you can see, the AD664BD-UNI offers a good balance between performance, flexibility, and cost, making it an ideal choice for various applications.
Implementation and Interfacing
Implementing the AD664BD-UNI in your design is relatively straightforward. Here are some tips for interfacing and implementing the DAC:
– Connect the reference voltage source to the VREF pin.- Connect the digital input data to the I/O port.- Set the output range and gain using the appropriate control bits.- Enable or disable the transparent mode as needed.- Power the DAC using a suitable power supply.
Conclusion
The AD664BD-UNI is a versatile and high-performance DAC that offers numerous advantages for various applications. Its features, specifications, and ease of implementation make it an excellent choice for designers looking for a reliable and cost-effective solution.