AD5667RBCPZ-REEL7

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The AD5667RBCPZ-REEL7 is a 16-bit, low-power and voltage output digital-to-analog converter (DAC) in 10-lead MSOP and 10-lead narrow body SOIC packages. It has a 1.8 V to 5.25 V power supply range, 1 LSB internal Reference (Requires REFCAP capacitor) and rail-to-rail output operation.

The AD5667RBCPZ-REEL7 is ideal for applications such as digital control of DACs, audio systems, ad-hoc sensing and control, automatic test equipment (ATE), and any other digital-controlled application requiring DACs with high reliability, precision, low noise and low power consumption.

The AD5667RBCPZ-REEL7 offers excellent performance over temperature and features shutdown mode where quiescent current is reduced to less than 500 nA. It also features power-on reset which ensures that the DAC output returns to the midscale at power-up (after the Capacitor is charged). In addition, the AD5667RBCPZ-REEL7 has an integrated logic on-board that supports a wide range of microprocessors with a bidirectional serial interface (SPI or 2-wire).

Application Field

The AD5667RBCPZ-REEL7 is suitable for use in portable applications such as blood pressure monitors, handheld instruments, and battery-powered applications. It is also used in industrial and medical instrumentation, industrial process control equipment, test and measurement equipment, and portable data acquisition systems. Furthermore, AD5667RBCPZ-REEL7 is used in audio systems, video systems, and digital control of DACs.

Working Principle

The AD5667RBCPZ-REEL7 is a monolithic dual channel digital-to-analog converter (DAC) that includes a track and hold register and an on-chip 1 LSB internal reference. Its operation is based on a charge redistribution DAC architecture which allows Rail-to-Rail output swing with a nominal output swing of 1.75 V with a 1.8 V supply. The device typically consumes 2.5 mA of quiescent current and is provided with a shutdown mode where the quiescent current is reduced to less than 500 nA. The device also features a power-on reset circuit that ensures that the DAC output returns to midscale at power-up after the on-chip reference capacitor is charged.

The AD5667RBCPZ-REEL7 has a double-buffered input register. A double-buffered serial input port (SPI or 2-wire) for accessing the input register provides a bidirectional communication interface for microprocessors. The AD5667RBCPZ-REEL7 data input register can be programmed for 8- or 16-bit resolution. The devices use a charge redistribution DAC architecture to produce a differential voltage output.

The digital logic inside the AD5667RBCPZ-REEL7 supports two different control modes: Serial Port Interface (SPI)/2-Wire or Parallel Binary. In SPI/2-Wire mode, the data word is loaded into the device when the SYNC pin is taken low. The SYNC pin can be used to synchronized multiple parts on the same clock. The AD5667RBCPZ-REEL7 has fast settling time of 5 µs for a full-scale step and a low noise output of 30 nV√Hz typical.

The device uses a bandgap voltage reference to provide an adjustable analog reference voltage. The REFCAP capacitor must be connected to the REFP pin to complete the internal reference circuit. The REFCAP capacitor value depends on the desired output voltage swing. The capacitor typically ranges from 0.1 μF to 2.2 μF, depending on the internal resistor tolerances. The full-scale output range of the DAC can be adjusted with this reference voltage.

The AD5667RBCPZ-REEL7 also provides fault detection and current output states. The device has an open-circuit output fault protection circuit that disables the DAC outputs during an output short-circuit fault. The device also has a power on reset circuit which returns the DAC output to its mid-scale level once the power is applied.

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