Ultra-Small, Single-Channel, 8-/10-/12-Bit Buffered Output Voltage DACs with Internal Reference and IC Interface

The MAX5803/MAX5804/MAX5805 single-channel, low-power, 8-/10-/12-bit, voltage-output digital-to-analog converters (DACs) include output buffers and an internal reference that is selectable to be 2.048V, 2.500V, or 4.096V. The MAX5803/MAX5804/MAX5805 accept a wide supply voltage range of 2.7V to 5.5V with extremely low power (< 1mW) consumption to accommodate most low-voltage applications. A precision external reference input allows rail-to-rail operation and presents a 100kΩ (typ) load to an external reference.

The MAX5803/MAX5804/MAX5805 have an I2C-compatible, 2-wire interface that operates at clock rates up to 400kHz. The DAC output is buffered and has a low supply current of 155µA (typical at 3V) and a low offset error of ±0.5mV (typical). On power-up, the MAX5803/MAX5804/MAX5805 reset the DAC outputs to zero, providing additional safety for applications that drive valves or other transducers which need to be off on power-up. The internal reference is initially powered down to allow use of an external reference.

The MAX5803/MAX5804/MAX5805 include a user-configurable active-low asynchronous input, active-low AUX for additional flexibility. This input can be programmed to asynchronously clear (active-low CLR) or temporarily gate (active-low GATE) the DAC output to a user-programmable value. A dedicated active-low asynchronous LDAC input is also included. This allows simultaneous output updates of multiple devices.

The MAX5803/MAX5804/MAX5805 are available in 10-pin TDFN/µMAX® packages and are specified over the -40°C to +125°C temperature range.

Applications

* Automatic Tuning and Optical Control * Data Acquisition * Gain and Offset Adjustment * Portable Instrumentation * Power Amplifier Control and Biasing * Process Control and Servo Loops * Programmable Voltage and Current Sources

* Single High-Accuracy DAC Channel

* 12-Bit Accuracy Without Adjustments

* ±1 LSB INL Buffered Voltage Output

* Guaranteed Monotonic Over All Operating Conditions

* Three Precision Selectable Internal References

* 2.048V, 2.500V, or 4.096V

* Internal Output Buffer

* Rail-to-Rail Operation with External Reference

* 6.3µs Settling Time

* Output Directly Drives 2kΩ Loads

* Small, 10-Pin, 2mm x 3mm TDFN and 3mm x 5mm µMAX Packages

* Wide 2.7V to 5.5V Supply Range

* Flexible 1.8V to 5.5V VDDIO

* Fast 400kHz, I2C-Compatible, 2-Wire Serial Interface with Readback

* Power-On-Reset to Zero-Scale DAC Output

* User-Configurable Asynchronous I/O Functions: Active-Low CLR, Active-Low LDAC, Active-Low GATE

* Three Software-Selectable Power-Down Output Impedances: 1kΩ, 100kΩ, or High Impedance

* Low 155µA DAC Supply Current at 3V