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DAC124S085 Datasheet(PDF) 22 Page - Texas Instruments

Part No. DAC124S085
Description  DAC124S085 12-Bit Micro Power Quad Digital-to-Analog Converter With Rail-to-Rail Output
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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DAC124S085 Datasheet(HTML) 22 Page - Texas Instruments

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LP2980
1 PF
Input
Voltage
ON /OFF
VIN
VOUT
VOUT = 0V to 5V
DAC124S085
DIN
SCLK
SYNC
VA VREFIN
0.1 PF
1 PF
0.1 PF
Input
Voltage
0.01 PF
VOUT = 0V to 5V
DAC124S085
DIN
SCLK
SYNC
VA VREFIN
0.1 PF
LP3985
22
DAC124S085
SNAS348G – MAY 2006 – REVISED APRIL 2016
www.ti.com
Product Folder Links: DAC124S085
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Copyright © 2006–2016, Texas Instruments Incorporated
Using References as Power Supplies (continued)
R(min) = (VIN(max) – VZ(min)) / IZ(max)
(4)
and
R(max) = (VIN(min) – VZ(max)) / ((IDAC(max) + IZ(min))
where
VZ(min) and VZ(max) are the nominal LM4050 output voltages ± the LM4050 output tolerance over
temperature
IZ(max) is the maximum allowable current through the LM4050
IZ(min) is the minimum current required by the LM4050 for proper regulation
IDAC(max) is the maximum DAC124S085 supply current
(5)
10.1.3 LP3985
The LP3985 is a low-noise, ultra-low dropout voltage regulator with a 3% accuracy over temperature. It is a good
choice for applications that do not require a precision reference for the DAC124S085. It comes in 3.0-V, 3.3-V,
and 5-V versions, among others, and sports a low 30-µV noise specification at low frequencies. Because low
frequency noise is relatively difficult to filter, this specification could be important for some applications. The
LP3985 comes in a space-saving 5-pin SOT-23 and 5-bump DSBGA packages.
Figure 39. LP3985 Regulator
An input capacitance of 1 µF without any ESR requirement is required at the LP3985 input, while a 1-µF ceramic
capacitor with an ESR requirement of 5 m
Ω to 500 mΩ is required at the output. Careful interpretation and
understanding of the capacitor specification is required to ensure correct device operation.
10.1.4 LP2980
The LP2980 is an ultra-low dropout regulator with a 0.5% or 1.0% accuracy over temperature, depending upon
grade. It is available in 3.0-V, 3.3-V, and 5-V versions, among others.
Figure 40. LP2980 Regulator


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