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DAC11001A_V01 Datasheet(Hoja de datos) 28 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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 28 page
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DAC110 01
C
1
C
2
OPA 161 1
VREFP
VREFN
OPA828
OPA 828
REFNF
REFNS
REFPF
REFPS
+
±
+
±
+
±
VOUT
DAC110 01
C1
C2
THS401 1
VREFP
VREFN
THS401 1
THS401 1
REFNF
REFNS
REFPF
REFPS
+
±
+
±
+
±
Power
Amplifier
Line ar
Actu ato r
Sen sor
Output
Gai n/
Atte nuation
28
DAC11001A, DAC91001, DAC81001
SLASEL0 – OCTOBER 2019
www.ti.com
Product Folder Links: DAC11001A DAC91001 DAC81001
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
Typical Application (continued)
9.2.3 High-Precision Control Loop
High-precision control loops are used in precision motion-control applications, such as linear actuator control,
servo motor control, galvanometer control, and more. The key requirements for such applications is resolution,
monotonicity, settling time, and code-to-code glitch. Figure 17 provides a simplified circuit of a linear actuator
control circuit, wherein the DACx1001 commands the set point and an analog loop controls the actuator.
Figure 17. High-Precision Control Loop
9.2.3.1 Design Requirements
DNL: ±1 LSB max at 20-bits
Settling time: < 2 µs
Code-to-code Glltch: < 2 nV-s
9.2.3.2 Detailed Design Procedure
The DACx1001 provides 20-bit monotonic resolution at < ±1 LSB DNL. The device provides < 2 µs setting time
and < 2 nV-s code-to-code glitch for major carry transition. The reference and output buffer used for this design
is the THS4011, a high-speed amplifier with a 90-ns settling time. For the best settling response, use C1 and C2
between 10 pF to 50 pF.
9.2.4 Arbitrary Waveform Generation (AWG)
Arbitrary waveform generation circuits are common in memory and semiconductor test equipment. These circuits
are used to generate reference ac waveforms to test semiconductor devices. The key performance parameters
of such circuits are THD, SNR, and the update rate. Figure 18 shows the basic building block example of an
AWG circuit using the DACx1001.
Figure 18. Arbitrary Waveform Generation
9.2.4.1 Design Requirements
THD at 1 kHz: > –105 dB
Update rate: 100 kHz
9.2.4.2 Detailed Design Procedure
The DACx1001 provides a THD of –105 dB at 1 kHz. The device provides update rates of up to 1 MHz, with
marginal degradation in THD at higher frequencies. The OPA828 provides the best balance between the voltage
and current noise densities, and is therefore an excellent choice to use as reference buffers. The OPA1611 is a
low-distortion amplifier for high-THD applications.




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