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DAC53401 Datasheet(PDF) 10 Page - Texas Instruments |
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DAC53401 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 43 page OUT REF N DAC _ DATA V V GAIN 2 u u OUT DD N DAC _ DATA V V 2 u 10 DAC53401, DAC43401 SLASES7 – JULY 2019 www.ti.com Product Folder Links: DAC53401 DAC43401 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Digital-to-Analog Converter (DAC) Architecture The DACx3401 family of devices consists of string architecture with an output buffer amplifier. The Functional Block Diagram section shows the DAC architecture within the block diagram. This DAC architecture operates from a 1.8-V to 5.5-V power supply. These devices consume only 0.1 mA of current when using a 1.8-V power supply. The DAC output pin starts up in high impedance mode making it an excellent choice for power-supply control applications. To change the power-up mode to 10k Ω-GND, program the DAC_PDN bit (address: D1h), and load these bits in the device NVM. 8.3.1.1 Reference Selection and DAC Transfer Function The device writes the input data to the DAC data registers in straight-binary format. After a power-on or a reset event, the device sets all DAC registers to the values set in the NVM. 8.3.1.1.1 Power Supply as Reference By default, the DACx3401 operate with the power-supply pin (VDD) as a reference. Equation 1 shows DAC transfer function when the power-supply pin is used as reference. where: • N is the resolution in bits, either 8 (DAC43401) or 10 (DAC53401). • DAC_DATA is the decimal equivalent of the binary code that is loaded to the DAC register. • DAC_DATA ranges from 0 to 2 N – 1. • VDD is used as the DAC reference voltage. (1) 8.3.1.1.2 Internal Reference The DACx3401 also contains an internal reference that is disabled by default. Enable the internal reference by writing 1 to REF_EN (address D1h). The internal reference generates a fixed 1.22-V voltage (typical). Using DAC_SPAN (address D1h) bits, gain of 1.5X, 2X, 3X, 4X can be achieved for the DAC output voltage (VOUT) Equation 2 shows DAC transfer function when the internal reference is used. where: • N is the resolution in bits, either 8 (DAC43401) or 10 (DAC53401). • DAC_DATA is the decimal equivalent of the binary code that is loaded to the DAC register • DAC_DATA ranges from 0 to 2 N – 1. • VREF is the internal reference voltage = 1.22 V. • GAIN = 1.5x, 2x, 3x, 4x based on DAC_SPAN (address D1h) bits. (2) |
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