LTC2644 PWM to VOUT DACs

LTC2644 PWM to VOUT DACs

Linear Technology's LTC™2644 is a family of dual 12-, 10-, and 8-bit PWM-to-voltage output DACs with an integrated high accuracy, low drift, 10 ppm/°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 8 μs typically and are capable of sourcing and sinking up to 5 mA (3 V) or 10 mA (5 V), eliminating voltage ripple and replacing slow analog filters and buffer amplifiers. The LTC2644 has a full-scale output of 2.5 V using the 10 ppm/°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 60 ms. The part operates from a single 2.7 V to 5.5 V supply and supports PWM input voltages from 1.71 V to 5.5 V.

Features
  • No latency PWM-to-voltage conversion
  • Voltage output updates and settles within 8 μs
  • 100 kHz to 30 Hz PWM input frequency
  • ±2.5 LSB max INL; ±1 LSB max DNL (LTC2644-12)
  • Guaranteed monotonic
  • Pin-selectable internal or external reference
  • 2.7 V to 5.5 V supply range
  • 1.71 V to 5.5 V input voltage range
  • Low power: 2.7 mA at 3 V, <1 μA power-down
  • Guaranteed operation from –40°C to 125°C
  • 12-lead MSOP package
Applications
  • Digital calibration
  • Trimming and adjustment
  • Level setting
  • Process control and industrial automation
  • Instrumentation
  • Automotive

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