Ultra-Small, Dual-Channel, 8-/10-/12-Bit Buffered Output DACs with Internal Reference and I²C Interface

The MAX5800/MAX5801/MAX5802 2-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 MAX5800/MAX5801/MAX5802 accept a wide supply voltage range of 2.7V to 5.5V with extremely low power (1.5mW) 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 MAX5800/MAX5801/MAX5802 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 less than 250µA per channel and a low offset error of ±0.5mV (typ). On power-up, the MAX5800/MAX5801/MAX5802 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 MAX5800/MAX5801/MAX5802 allow simultaneous output updates using software LOAD commands.

A clear logic input (active-low CLR) allows the contents of the CODE and the DAC registers to be cleared asynchronously and sets the DAC outputs to zero. The MAX5800/MAX5801/MAX5802 are available in a small 10-pin µMAX® and an ultra-small, 10-pin TDFN package 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

* Two High-Accuracy DAC Channels

* 12-Bit Accuracy Without Adjustment

* ±1 LSB INL Buffered Voltage Output

* Monotonic Over All Operating Conditions

* Independent Mode Settings for Each DAC

* Three Precision Selectable Internal References

* 2.048V, 2.500V, or 4.096V

* Internal Output Buffer

* Rail-to-Rail Operation with External Reference

* 4.5µs Settling Time

* Outputs Directly Drive 2kΩ Loads

* Small 5mm x 3mm 10-Pin µMAX or Ultra-Small 3mm x 3mm 10-Pin TDFN Package

* Wide 2.7V to 5.5V Supply Range

* Separate 1.8V to 5.5V VDDIO Power-Supply Input

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

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

* Active-Low CLR For Asynchronous Control

* Three Software-Selectable Power-Down Output Impedances

* 1kΩ, 100kΩ, or High Impedance

* Low 350µA Supply Current at 3V VDD