ISL5761/2IAZ

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The ISL5761/2IAZ is a low power specialized high performance Data Acquisition (DAQ) Digital to Analog Converter (DAC). DAQ systems are essential in applications that require the acquisition of real world information into digital signals for further processing. DAQs employ different kinds of signal interface components to acquire such signals, and the DAC is one such component.

The ISL5761/2IAZ is an 8-Channel 12 bit Resolution DAC (Figure 1) is designed for low power applications using the I2C interface. The DAC provides a total of 8 single-ended I2C commandable Inputs and Outputs, and is specified to 15 MSPS with a 4.84 MHz I2C clock. The DAC is capable of directly driving Live-Zero switches without any external reference levels, providing a greater degree of flexibility for system integrators. The device operates over a wide single 2.7V-5% to 3.6V+5% supply voltage range, consuming only 10mW during operation.

Figure 1: ISL5761/2IAZ DAC

The ISL5761/2IAZ belongs to Texas Instruments’ family of DACs, and employs both voltage-mode and current-mode DAC architectures. This allows the DAC to output both voltage and current-mode signals. The voltage-mode architecture gives it multiple interfaces, including three-wire and I2C, with programmable full-scale range, offset and gain options. On the other hand, the current-mode architecture provides the possibility to adjust the output current range, as well as the reference current. The current-mode architecture is versatile, as it can easily drive large loads and works with low-voltage supplies.

In order to minimize the power consumption of DAQ systems, ISL5761/2IAZ employs a power saving feature called Low Power Standby Mode. This power saving feature allows the DAC to enter standby mode, ensuring that no current is consumed when the DAC is not in use. When the DAC is required, it can be quickly restored to full operation by issuing a command to the I2C controller. The DAC also features Failing mode detection, which enables the DAC to detect any failure to the I2C bus, and take corrective measures. This provides a high degree of reliability, and reduces the possibility of output irregularities.

The performance of the ISL5761/2IAZ makes it an ideal choice for applications such as data acquisition, medical instrumentation, industrial process control and railway systems. The DAC’s low power consumption makes it a great fit for battery-powered applications. The DAC is compatible with several industrial protocols, such as CAN, RS-485 and ProfiBus, which can provide great flexibility in complex systems. The ISL5761/2IAZ DAC also features a programmable range, offset and gain options, allowing system integrators to fine-tune the DAC’s performance in different applications.

In conclusion, the ISL5761/2IAZ is an ideal choice for low power Data Acquisition applications. The DAC’s low power consumption and integrated features make it well suited for a wide range of applications. The DAC can easily be configured through the I2C interface, and its versatile current-mode architecture makes it suitable for driving large loads. System integrators can adjust the output current range and reference current, as well as the full-scale range, offset and gain options. In addition, the DAC can enter low power standby mode and detect any failure to the I2C bus, making it a reliable and efficient choice for DAQ applications.

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