Quad, 14-Bit nanoDAC+ with 2 ppm/°C On-Chip Reference and SPI Interface
The AD5685R nanoDAC+TM is a quad, 14-bit, rail-to-rail, voltage output DAC. The device includes a 2.5V, 2ppm/˚C internal reference (enabled by default) and a gain select pin giving a full-scale output of 2.5V (gain=1) or 5V (gain=2).
The device operates from a single 2.7 V to 5.5 V supply, is guaranteed monotonic by design and exhibits less than 0.1% FSR gain error and 1.5mV offset error performance. The device is available in a 3mm X 3mm LFCSP and a TSSOP package.
The AD5685R also incorporates a power-on-reset circuit and a RSTSEL pin that ensures the DAC outputs power up to zero-scale or midscale, and remain there until a valid write takes place. Each device contains a per-channel power-down feature that reduces the current consumption of the device to 4 uA at 3 V while in power-down mode.
The AD5685R employs a versatile SPI interface that operates at clock rates up to 50 MHz and includes a VLOGIC pin intended for 1.8V/ 3V/ 5V logic.
- High Relative Accuracy: AD5685R (14-bit): ±1LSB INL max
- Low drift on-chip reference: 2.5V, 2ppm/°C temperature drift
- Tiny Package: 3mm × 3mm 16 lead LFCSP or 16 lead TSSOP
- Optical transceivers
- Base-station power amplifers
- Process control (PLC I/O cards)
- Industrial automation
- Data acquisition systems
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The EVAL-AD5686RSDZ evaluation board is designed to help users quickly prototype new AD5686R circuits and reduce design time. The AD5686R operates from a single 2.7 V to 5.5 V supply. The AD5686R incorporates an internal 2.5 V reference to give an output voltage of 2.5 V or 5 V. The evaluation board also incorporates additional voltage references.
Full data on the AD5686R can be found in the data sheet, available from Analog Devices, which should be consulted in conjunction with the user guide when using the evaluation board.
The EVAL-AD5686RSDZ interfaces to the USB port of a PC via an SDP board. Software is supplied with the evaluation board to allow the user to program the AD5686R. A PMOD™ connection is also available for different microcontrollers.
This evaluation board is compatible with any Analog Devices SDP board, which can be purchased separately.
Modern DACs and DAC Buffers Improve System Performance, Simplify Design
By Padraic O'Reilly and Charly El-Khoury
(Analog Dialogue Vol. 46, March 2012)