LTC2645 Datasheet | Linear Technology

LTC2645 Quad 12-/10-/8-Bit PWM to VOUT DACs with 10ppm/°C Reference Features nn No Latency PWM-to-Voltage Conversion nn Voltage Output Updates and Settles within 8µs nn 100k Hz to 30Hz PWM Input Frequency nn ±2.5LSB Max INL; ±1LSB Max DNL (LTC2645-12) nn Guaranteed Monotonic nn Pin-Selectable Internal or External Reference nn 2.7V to 5.5V Supply Range nn 1.71V to 5.5V Input Voltage Range nn Low Power: 4m A at 3V, <1µA Power-Down nn Guaranteed Operation from - 40°C to 125°C nn 16-Lead MSOP Package APPLICATIONS nn Digital Calibration nn Trimming and Adjustment nn Level Setting nn Process Control and Industrial Automation nn Instrumentation nn Automotive DESCRIPTION The LTC®2645 is a family of quad 12-, 10-, and 8-bit PWM-to-voltage output DACs with an integrated high accuracy, low drift, 10ppm/°C reference in a 16-lead MSOP package. It has rail-to-rail output buffers and is guaranteed monotonic. The LTC2645 measures the period and pulse width of the PWM input signals and updates the voltage output DACs after each corresponding PWM input rising edge. The DAC outputs update and settle to 12-bit accuracy within 8µs typically and are capable of sourcing and sinking up to 5m A (3V) or 10m A (5V), eliminating voltage ripple and replacing slow analog filters and buffer amplifiers. The LTC2645 has a full-scale output of 2.5V using the 10ppm/°C internal reference. It can operate with an external reference, which sets the full-scale output equal to the external reference voltage. Each DAC enters a pin-selectable idle state when the PWM input is held unchanged for more than 60ms. The part operates from a single 2.7V to 5.5V supply and supports PWM input voltages from 1.71V to 5.5V. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5396245, 5859606, 6891433, 6937178, 7414561. TYPICAL APPLICATION 4-Channel PWM to Voltage Output DAC PWM INPUTS 1.7V TO 5.5V 0.1µF INA VOUTA INB VOUTB INC VOUTC IND VOUTD...