MICROCHIP TC1321EOATR

The TC1321 is a serially accessible, 10-bit voltage output, digital-to-analog converter (DAC). The DAC produces an output voltage that ranges from ground to an externally supplied reference voltage. It operates from a single power supply that can range from 2.7V to 5.5V, making it ideal for a wide range of applications. Built into the part is a Power-on Reset (POR) function that ensures that the device starts at a known condition. Communication with the TC1321 is accomplished via a simple 2-wire SMBus/ I²C compatible serial port, with the TC1321 acting as a slave only device. The host can enable the SHDN bit in the CONFIG register to activate the Low Power Standby mode.

The TC1321 is a monolithic 10-bit digital-to-analog converter that is designed to operate from a single supply that can range from 2.7V to 5.5V. The DAC consists of a data register (DATA), a configuration register (CONF), and a current output amplifier. The TC1321 uses an external reference which also determines the maximum output voltage. The TC1321 uses a current steering DAC based on an array of matched current sources. This current, along with a precision resistor, converts the contents of the DATA Register and VREF into an output voltage, VOUT.

The reference pin, VREF, is a buffered high-impedance input. Because of this, the load regulation of the reference source needs only to be able to tolerate leakage levels of current (less than 1 μA). VREF accepts a voltage range from 0 to (VDD - 1.2V). Input capacitance is typically 10 pF. The TC1321 DAC output is buffered with an internal unity gain rail-to-rail input/output amplifier with a typical slew rate of 0.8V/μs. Maximum full scale transition settling time is 10 μsec to within ±1/2 LSB when loaded with 1 kΩ in parallel with 100 pF. The TC1321 allows the host to put it into a Low Power (IDD = 0.5 μA, typically) Standby mode. In this mode, the D/A conversion is halted. The SMBus port operates normally.

• 10-Bit Digital-to-Analog Converter
• 2.7 - 5.5V Single Supply Operation
• Simple SMBus/I²C Serial Interface
• Low Power Operation
  • Normal Mode: 350 μA
  • Shutdown Mode: 0.5 μA
• Temperature Range: -40°C to +85°C
• 8-Pin SOIC and 8-Pin MSOP Packages

• Programmable Voltage Sources
• Digital Controlled Amplifiers/Attenuators
• Process Monitoring and Control