Overview
The LTC2644IMS-L10#PBF is a dual 10-bit PWM-to-voltage output Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. This component is part of the LTC2644 family, which includes dual 12-, 10-, and 8-bit DACs. It features an integrated high accuracy, low drift, 10ppm/°C reference and is packaged in a 12-lead MSOP package. The DACs are designed with rail-to-rail output buffers and are guaranteed monotonic, ensuring precise and reliable voltage output.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Resolution | 10 | 10 | 10 | Bits | |
| VCC (Positive Supply Voltage) | For Specified Performance | 2.7 | 5.5 | V | |
| IOVCC (Digital Input Supply Voltage) | For Specified Performance | 1.71 | 5.5 | V | |
| ICC (Supply Current) | VCC = 3V, Internal Reference | 2.7 | 4 | 6 | mA |
| ISC (Short Circuit Output Current) | Sinking/Sourcing | -48 | 48 | mA | |
| tPER (INA/INB Rising Edge to Rising Edge Period) | 0.040 | 33 | ms | ||
| t4 (INA/INB Rising Edge to DAC Update Delay) | 3.2 | μs | |||
| fMAX (INA/INB Frequency) | 0.03 | 25 | kHz |
Key Features
- Integrated High Accuracy Reference: The LTC2644IMS-L10#PBF includes a high accuracy, low drift, 10ppm/°C reference, ensuring stable and precise voltage outputs.
- Rail-to-Rail Output Buffers: The DACs feature rail-to-rail output buffers, capable of sourcing and sinking up to 5mA (3V) or 10mA (5V), which helps in eliminating voltage ripple and replacing slow analog filters and buffer amplifiers.
- Monotonicity: The DACs are guaranteed monotonic, ensuring that the output voltage increases or decreases in a predictable and linear manner.
- Idle State: Each DAC can enter a pin-selectable idle state when the PWM input is held unchanged for more than 60ms, helping in power management.
- Wide Operating Range: The component operates from a single 2.7V to 5.5V supply and supports PWM input voltages from 1.71V to 5.5V.
Applications
The LTC2644IMS-L10#PBF is suitable for various applications requiring precise and stable analog voltage outputs from PWM signals. These include:
- Industrial Control Systems: For converting PWM signals from microcontrollers or other digital sources into analog voltages for control and monitoring purposes.
- Automotive Systems: In automotive applications where precise voltage control is necessary, such as in engine control units or other automotive electronics.
- Medical Devices: In medical equipment where accurate and stable analog outputs are critical for diagnostic or therapeutic purposes.
- Consumer Electronics: In consumer devices that require precise voltage control, such as audio equipment or display devices.
Q & A
- What is the resolution of the LTC2644IMS-L10#PBF DAC?
The LTC2644IMS-L10#PBF has a resolution of 10 bits.
- What is the operating voltage range of the LTC2644IMS-L10#PBF?
The component operates from a single 2.7V to 5.5V supply.
- What is the maximum frequency of the PWM input for the LTC2644IMS-L10#PBF?
The maximum frequency of the PWM input is 25 kHz for the 10-bit version.
- Can the LTC2644IMS-L10#PBF use an external reference voltage?
- What is the settling time for the DAC outputs?
The DAC outputs settle to 12-bit accuracy within 8μs typically.
- How much current can the output buffers source or sink?
The output buffers can source or sink up to 5mA (3V) or 10mA (5V).
- What is the power supply rejection ratio (PSRR) of the LTC2644IMS-L10#PBF?
The power supply rejection ratio is –80 dB.
- Can the LTC2644IMS-L10#PBF enter an idle state?
- What is the temperature coefficient of the internal reference?
- What package type is the LTC2644IMS-L10#PBF available in?
