LTC2644 Datasheet | Linear Technology

Features n No Latency PWM-to-Voltage Conversion n Voltage Output Updates and Settles within 8µs n100k Hz to 30Hz PWM Input Frequency n±2.5LSB Max INL; ±1LSB Max DNL (LTC2644-12) n Guaranteed Monotonic n Pin-Selectable Internal or External Reference n2.7V to 5.5V Supply Range n1.71V to 5.5V Input Voltage Range n Low Power: 2.7m A at 3V, <1µA Power-Down n Guaranteed Operation from - 40°C to 125°C n12-Lead MSOP Package APPLICATIONS n Digital Calibration n Trimming and Adjustment n Level Setting n Process Control and Industrial Automation n Instrumentation n Automotive LTC2644 Dual 12-/10-/8-Bit PWM to VOUT DACs with 10ppm/°C Reference DESCRIPTION The LTC®2644 is a family of dual 12-, 10-, and 8-bit PWM-to-voltage output DACs with an integrated high accuracy, low drift, 10ppm/°C reference in a 12-lead MSOP package. It has rail-to-rail output buffers and is guaranteed monotonic. The LTC2644 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 LTC2644 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 PWM INPUTS 1.7V TO 5.5V 2-Channel PWM to Voltage Output DAC 0.1µF INA VOUTA INB VOUTB IOVCC PD VCC...