Circuit Function and Benefits
This circuit is a multichannel DAC configuration with excellent temperature drift performance. It provides 32 independent voltage channels with 14-bit resolution and a typical temperature stability of less than 3 ppm/°C.
Circuit Description
Figure 1 shows a typical configuration of the AD5382 using an external reference. In the circuit shown, all AGND, SIGNAL_GND, and DAC_GND pins are tied together and to a common AGND pin. On the AD5382 device, AGND and DGND are tied together. At power-up, the AD5382 defaults to operating with an external reference.
This design uses two separate 5.0 V supplies, one for the reference and analog portion of the AD5382 (AVDD), and the other for the digital portion of the AD5382 (DVDD). For best performance, always use a linear regulator to drive the analog portion of the circuit. If a switching regulator is used to drive the digital portion, care should be taken to minimize switching noise on the DVDD supply pin. Additional decoupling with series ferrite beads may also be required. The AD5382 digital (DVDD) supply can be either 3 V or 5 V, which allows for great flexibility when interfacing with digital components. If the power is derived from a linear regulator, the two supply pins can be tied together and connected to a common 5 V supply. Refer to the ADIsimPower™ design tool for guidance on power supply design.
It is recommended to use 0.1 µF ceramic capacitors and 10 µF tantalum capacitors to decouple the power supplies close to the device. In this circuit, the reference voltage for the AD5382 is derived from an external 2.5 V reference source, the ADR421 or ADR431. The ADR431 has a lower output voltage noise and is suitable for applications where this feature is particularly important. The reference source should be decoupled at the REFOUT/REFIN pins of the device with a 0.1 µF capacitor.
Common Variations
A variation of this circuit is to use the 1.2 V reference source ADR280 for the AD5382-3, with all other connections and components being the same as described above.
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