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DAC53401_V01 Datasheet(Hoja de datos) 33 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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 33 page
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VOUT
RSET
VCC
Q1
LED
ISET
ILED = ISET
VDAC
VFB
VDD
DACx340 1
+
-
VGS
33
DAC53401, DAC43401
www.ti.com
SLASES7 – JULY 2019
Product Folder Links: DAC53401 DAC43401
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Copyright © 2019, Texas Instruments Incorporated
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The DACx3401 is a buffered-output, single-channel, low-power DAC available in a tiny 3 × 3 package. The
features, low power, and small package makes this DAC suitable for general-purpose applications in a wide
range of end equipment. Some of the most common applications for this devices are set-and-forget LED biasing
in automotive applications and mobile projectors, power-supply control, general-purpose function generation,
medical alarm generation, programmable comparator applications (such as smoke detectors, standalone PWM
control loops, and offset and gain trimming in precision circuits).
9.2 Typical Applications
This section explains the design details of three primary applications of DACx3401: programmable LED biasing,
power-supply control. and medical alarm generation.
9.2.1 Programmable LED Biasing
LED and laser biasing or driving circuits often require accuracy and stability of the luminosity with respect to
variation in temperature, electrical conditions, and physical characteristics. This accuracy and stability are most
effectively achieved using a precision DAC, such as the DACx3401. The DACx3401 has additional features,
such as the VFB pin that compensates for the gate-to-source voltage of the transistor (VGS) drop and the drift of
the MOSFET. The NVM allows the microprocessor to set-and-forget the LED biasing value, even during a power
cycle. Figure 18 shows the circuit diagram for LED biasing.
Figure 18. LED Biasing
9.2.1.1 Design Requirements
DAC output range: 0 V to 2.4 V
LED current range: 0 mA to 20 mA




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