Overview
Features and Benefits
- No Latency PWM-to-Voltage Conversion
- Voltage Output Updates and Settles within 8μs
- 100kHz to 30Hz PWM Input Frequency
- ±2.5LSB Max INL; ±1LSB Max DNL (LTC2644-12)
- Guaranteed Monotonic
- Pin-Selectable Internal or External Reference
- 2.7V to 5.5V Supply Range
- 1.71V to 5.5V Input Voltage Range
- Low Power: 2.7mA at 3V, <1μA Power-Down
- Guaranteed Operation from –40°C to 125°C
- 12-Lead MSOP Package
Product Details
The LTC2644 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 5mA (3V) or 10mA (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.
Applications
- Digital Calibration
- Trimming and Adjustment
- Level Setting
- Process Control and Industrial Automation
- Instrumentation
- Automotive
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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R461 Reliability Data3/22/2018PDF31 K
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DC2197A - Demo Manual2/29/2016PDF809K
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DN538 - Accurate, Fast Settling Analog Voltages from Digital PWM Signals3/31/2015PDF186K
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PWM to DC in One Cycle8/7/2014PDF509K
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
Support & Discussions
LTC2644 Discussions
Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.