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DAC53401_V01 Datasheet(Hoja de datos) 10 Page - Texas Instruments

No. de Pieza. DAC53401_V01
Descripción  DACx3401 10-Bit and 8-Bit, Voltage-Output Digital-to-Analog Converters With Nonvolatile Memory and PMBus™ Compatible I2C Interface in Tiny 2 × 2 WSON
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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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
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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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