DESCRIPTION

The LTC®1426 is a dual micropower 6-bit PWM DAC featuring versatile PWM outputs and a flexible pushbutton compatible digital interface. The DAC outputs provide a PWM signal that swings from 0V to VREF, allowing the full-scale output to be varied by adjusting the voltage at VREF. The PWM output frequency is typically 5kHz, easing output filtering requirements. VCC supply current is typically 50µA and drops to 0.2µA in shutdown.

FEATURES

■ Wide Supply Range: 2.7V ≤ VCC ≤ 5.5V

■ Wide Reference Voltage Range: 0V to 5.5V

■ Two Interface Modes:

Pulse Mode (Increment Only)

Pushbutton Mode (Increment/Decrement)

■ Low Supply Current: 50µA

■ 0.2µA Supply Current in Shutdown

■ Available in 8-Pin MSOP and SO Packages

■ DAC Contents Are Retained in Shutdown

■ DACs Power-Up at Midrange

■ Low Output Impedance: <100Ω

■ Output Frequency: 5kHz Typ

APPLICATIONS

■ LCD Contrast and Backlight Brightness Control

■ Power Supply Voltage Adjustment

■ Battery Charger Voltage and Current Adjustment

■ GaAs FET Bias Adjustment

■ Trimmer Pot Elimination