PWM to DC in One Cycle 10ppm/°C Reference L PWM to Binary 12-Bit DAC PWM to Binary 12-Bit DAC PWM to Binary 12-Bit DAC PWM to Binary PWM Input to DAC Output LTC2645 12-Bit DAC INA 2V/DIV VOUTA 500mV/DIV 20µs/DIV No Software. No Ripple. No Latency. Linear Technology’s PWM to VOUT DACs convert a PWM (pulse-width modulation) input to an accurate, stable, buffered voltage without the ripple, slow settling and external passive components of discrete filter implementations. The LTC®2645 quad PWM DAC measures the period and pulse width of the PWM input signal and updates the DAC output immediately with up to 12-bit accuracy, no software coding required. Features nn nn nn nn nn nn nn nn 30Hz to 100kHz PWM Input Buffered Rail-to-Rail Voltage Output Updates and Settles Within 8µs 10ppm/°C Internal Reference; 2.5V Full-Scale Pin-Selectable Internal or External Reference ±2.5 LSB Maximum INL; ±1LSB Maximum DNL 2.7V to 5.5V Supply 1.71V to 5.5V PWM Inputs Family of Dual and Quad PWM to VOUT DACs 12-Bit 10-Bit 8-Bit Dual 12-Pin MSOP LTC2644-12 LTC2644-10 LTC2644-8 Quad 16-Pin MSOP LTC2645-12 LTC2645-10 LTC2645-8 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Voltage Output DACs 8-Bit to 16-Bit Resolution, 1-Channel to 16-Channel VOUT DACs 1-Channel Parallel 16-Bit 2-Channel I2C SPI PWM SPI 4-Channel I2C PWM SPI 8-Channel I2C SPI 16-Channel I2C 1821 2641-16 2642-16 2704-16 1657 1650 1655 2654-16 2655-16 2656-16 2657-18 2604 2609 2600 2605 2619 2610 2615 2601 2641-14 2642-14 1658 2611 2641-12 2642-12 2606 2602 2607 SPI 2668-16 2704-14 14-Bit 2616 2612 2617 2644-12 2614 2645-12 2704-12 2668-12 2654-12 2655-12 2656-12 2657-12 12-Bit 1450 2630-12 2640-12 2631-12 2632-12 2633-12 2634-12 2635-12 2636-12 2637-12 1257 2621 2626 2622 2627 2624 2629 2620 2625 2630-10 2640-10 2631-10 2632-10 2633-10 2634-10 2635-10 2636-10 2637-10 10-Bit 2630-8 2640-8 2644-10 1663 1661 1669 1662 2631-8 2644-8 2632-8 2645-10 1664 2633-8 2645-8 2634-8 1660 2635-8 2636-18 2637-8 8-Bit 1665 16-/12-Bit Quad/Octal DACs with 10ppm/°C (Max) Internal Reference Low Glitch 16-/14-/12-Bit Unbuffered VOUT Unipolar or Bipolar DACs 12-Bit DAC with Internal Reference and 5V to 15V Supply Range Tiny 12-/10-/8-Bit Single/Dual/Quad/Octal DACs with 10ppm/°C Internal Reference 16-/14/-12-Bit ±10V VOUT SoftSpan™ DACs Low Power, Double Buffered 16-/12-Bit Parallel Interface DACs 16-/14-/12-Bit Single/Dual/Quad/Octal DACs with External Reference 16-/12-Bit ±10V VOUT SoftSpan DACs with 10ppm/°C (Max) Reference 16-Bit ±10V, Fast 2µs Settling, Parallel DAC in SSOP-36 Package 16-Bit, ±5V, Low Glitch DAC Micropower 10-/8-Bit Single/Dual/Quad/Octal DACs 14-Bit Low Power DAC in 8-Pin Packages 16-Bit, Low Power DAC with Internal Reference 12-/10-/8-Bit PWM to VOUT DACs www.linear.com/2645 n 1-800-4-LINEAR 0714