AD7247JR

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The AD7247JR is a low cost, low power, 12-bit digital-to-analog converter (DAC). It operates from a single +5 V supply and is packaged in a tiny 5-lead SOT-23 surface mount package. AD7247JR’s complete 12-bit DAC converter with reference requires just 35 mW of quiescent power and presents a low profile 3-mm × 3-mm chip-scale package that minimizes the need for external components.

AD7247JR is suitable for use in a variety of applications that require the conversion of digital information into analog signals such as global positioning systems (GPS), consumer electronics, process control, automated test equipment, and industrial instrumentation.

AD7247JR’s working principle is based on a current output design. When the chip is activated, an internal digital-to-analog converter (DAC) generates an analog current that corresponds to the digital input word. This current is buffered by an on-chip current source and is applied to a current output pin (IOUT). This current is also compared with a reference current, generated by an on-chip resistor network, and converted into a voltage (VOUT). The voltage is then buffered by an on-chip output amplifier. The digital input word and the reference voltage are both programmed using two external pins (CLOCK and REF).

AD7247JR also features high accuracy, which sets it apart from other non-current-output DACs. It offers guaranteed 10-bit monotonicity over temperature and channel-to-channel matching of 0.5 LSB max. In addition, the device has a maximum offset of ±1.2 mV, a maximum gain error of 0.5%, and a full-scale accuracy of 0.5%. It also provides a guaranteed linearity of ±2.5 LSB max and a high settling time of 25 ns. The device also has a power down feature that reduces the quiescent current to less than 0.005 µA.

In conclusion, the AD7247JR is a high precision, low cost, and low power 12-bit DAC. It provides a commercial-grade accuracy over temperature, as well as high accuracy and reliable performance. The device is suitable for a wide range of applications such as consumer electronics, industrial instrumentation, and medical instrumentation.

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