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DAC11001A_V01 Datasheet(Hoja de datos) 30 Page - Texas Instruments

No. de Pieza. DAC11001A_V01
Descripción  DACx1001 20-Bit, 18-Bit, and 16-Bit, Low-Noise, Ultra-Low Harmonic Distortion, Fast-Settling, High-Voltage Output, Digital-to-Analog Converters (DACs)
Descarga  42 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 30 page
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DAC110 01
+
±
R
OUT
C
COMP
VOUT
ROFS
RCM
RFB
DAC-OUT
2xR
OUT
2xR
OUT
DAC110 01
+
±
R
OUT
C
COMP
VOUT
ROFS
RCM
RFB
DAC-OUT
2xR
OUT
2xR
OUT
30
DAC11001A, DAC91001, DAC81001
SLASEL0 – OCTOBER 2019
www.ti.com
Product Folder Links: DAC11001A DAC91001 DAC81001
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Copyright © 2019, Texas Instruments Incorporated
System Examples (continued)
9.3.3 Embedded Resistor Configurations
The DACx1001 provides two embedded resistors with values is double the value of the output impedance of the
R2R ladder. These resistors can be used in various configurations, as shown in the following subsections.
9.3.3.1 Minimizing Bias Current Mismatch
The bias current mismatch in the output amplifier can lead to offset error at the output. To minimize mismatch,
the amplifier must have a matching resistor to that of the R2R output impedance on the feedback path. The
feedback resistors are used in parallel for this purpose, as shown in Figure 21. Some amplifiers may become
unstable with a feedback resistor in the buffer configuration. Therefore, a compensation capacitor (CCOMP) might
be needed, as shown. The typical value of this capacitor is in the range of 22 pF to 100 pF, depending on the
amplifier.
Figure 21. Minimizing Bias Current Mismatch
9.3.3.2 2x Gain configuration
The circuit of Figure 21 can be configured for 2x gain by connecting one of the resistor ends to ground, as shown
in Figure 22.
Figure 22. 2x Gain Configuration




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