The AD5648 is a low power, octal, 14-bit, buffered voltage output DAC that operates from a single 2.7 V to 5.5 V supply and is designed to be monotonic.
The AD5648 contains an on-chip reference with an internal gain of 2. The AD5648-1 contains a 1.25 V, 5 ppm/°C reference with a full-scale output range of 2.5 V. The AD5648-2 contains a 2.5 V, 5 ppm/°C reference with a full-scale output range of 5 V. At power-up, the on-chip reference is turned off, allowing the use of an external reference. The internal reference is enabled via software write.
A power-on reset circuit is included to ensure that the DAC output reaches 0 V and remains at this level until a valid write is performed. There is also a per-channel independent shutdown feature that reduces the power consumption of the device to 400 nA at 5 V in shutdown mode and provides a software-selectable output load.
The active-low LDAC function allows all DAC outputs to be updated simultaneously, and the user can select which DAC channels to update at the same time. There is also an asynchronous/CLR function that updates all DACs to user programmable code: zero-scale, midscale, or full-scale.
THE AD5648 FEATURES A VERSATILE 3-WIRE SERIAL INTERFACE CAPABLE OF OPERATING AT CLOCK RATES UP TO 50 UMHz and is compatible with standard spi, qspi,®™ microwire™, and dsp interface standards. It includes an on-chip precision output amplifier that enables rail-to-rail output swing.
Product features
- Octal 14-bit DAC.
- 1.25 V/2.5 V, 5 ppm/ºC on-chip reference.
- Available in 14-pin/16-pin TSSOP packages.
- Power-on reset to 0 V or midscale.
- Shutdown function. In shutdown mode, the DAC typically consumes 200 nA at 3 V and 400 nA at 5 V.
apply
Optical transceivers
Power amplifier control
Data acquisition system
Digital gain and offset voltage adjustment