Quad, 16-Bit DAC with 5 ppm/°C
On-Chip Reference in 14-Lead TSSOP
Low power quad 16-bit DAC
On-chip 1.25 V/2.5 V, 5 ppm/°C reference
Power down to 400 nA @ 5 V, 200 nA @ 3 V
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to zero scale or midscale
3 power-down functions
Hardware LDAC with LDAC override function
CLR function to programmable code
SDO daisy-chaining option
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
FUNCTIONAL BLOCK DIAGRAM
The AD5666 is a low power, quad, 16-bit, buffered voltage-
output DAC. The part operates from a single 2.7 V to 5.5 V
supply and is guaranteed monotonic by design.
The AD5666 has an on-chip reference with an internal gain of 2.
The AD5666-1 has a 1.25 V 5 ppm/°C reference, giving a full-scale
output of 2.5 V; the AD5666-2 has a 2.5 V 5 ppm/°C reference,
giving a full-scale output of 5 V. The on-board reference is off at
power-up, allowing the use of an external reference. The internal
reference is turned on by writing to the DAC.
The part incorporates a power-on reset circuit that ensures that
the DAC output powers up to 0 V (POR pin low) or to midscale
(POR pin high) and remains powered up at this level until a valid
write takes place. The part contains a power-down feature that
reduces the current consumption of the device to 400 nA at 5 V
and provides software-selectable output loads while in power-down
mode for any or all DAC channels.
The outputs of all DACs can be updated simultaneously using
the LDAC function, with the added functionality of user-select-
able DAC channels to simultaneously update. There is also an
asynchronous CLR that clears all DACs to a software-selectable
code—0 V, midscale, or full scale.
The AD5666 utilizes a versatile 3-wire serial interface that operates
at clock rates of up to 50 MHz and is compatible with standard
SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The
on-chip precision output amplifier enables rail-to-rail output
1. Quad, 16-bit DAC.
2. On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
3. Available in 14-lead TSSOP.
4. Selectable power-on reset to 0 V or midscale.
5. Power-down capability. When powered down, the DAC
typically consumes 200 nA at 3 V and 400 nA at 5 V.
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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