Understanding the AD664BD-UNI DAC
The AD664BD-UNI is a single-chip integrated circuit 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, which supports 4-bit, 8-bit, or 12-bit parallel words, allowing for simple interfacing with a variety of microprocessors.
The reset to zero control pin enables 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, allowing the output to respond immediately 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.
Features and Specifications
The AD664BD-UNI is powered by Analog Devices’ BiMOS II process, laser-trimmed thin-film resistors, and double-layer metal interconnects, ensuring the functionality integrity of the device. Here are some of the key features and specifications of the AD664BD-UNI:
| Feature | Specification |
|---|---|
| Number of DACs | 4 |
| Resolution | 12-bit |
| Output Range | Single-ended (UNI) or differential (BIP) |
| Supply Voltage | Single external reference voltage source |
| Interface | Microprocessor-compatible I/O port |
| Operating Temperature Range | -40掳C to +125掳C |
With these specifications, the AD664BD-UNI is well-suited for a variety of applications, including data acquisition systems, audio equipment, and industrial control systems.
Applications
The AD664BD-UNI is a versatile DAC that can be used in various applications. Here are some examples:
- Data Acquisition Systems: The high-resolution and wide output range of the AD664BD-UNI make it an excellent choice for data acquisition systems, where precise analog output is required.
- Audio Equipment: The AD664BD-UNI can be used in audio equipment, such as amplifiers and mixers, to provide high-quality analog output.
- Industrial Control Systems: The wide operating temperature range and robust design of the AD664BD-UNI make it suitable for industrial control systems, where reliability and stability are crucial.
Comparison with Other DACs
When comparing the AD664BD-UNI with other DACs, it’s essential to consider factors such as resolution, output range, supply voltage, and interface. Here’s a comparison table of the AD664BD-UNI with some other popular DACs:
| DAC | Resolution | Output Range | Supply Voltage | Interface |
|---|---|---|---|---|
| AD664BD-UNI | 12-bit | Single-ended (UNI) or differential (BIP) | Single external reference voltage source | Microprocessor-compatible I/O port |
| AD1674KNZ | 16-bit |
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