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DAC11001A_V01 Datasheet(Hoja de datos) 16 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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 16 page
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DAC110 01
+
±
VOUT
ROFS
RCM
RFB
DAC-OUT
C1
C2
+
±
+
±
+
±
Voltage
Reference
VREFP
VREFN
REFPF
REFPS
REFNF
REFNS
16
DAC11001A, DAC91001, DAC81001
SLASEL0 – OCTOBER 2019
www.ti.com
Product Folder Links: DAC11001A DAC91001 DAC81001
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Copyright © 2019, Texas Instruments Incorporated
Feature Description (continued)
8.3.2 External Reference
The DACx1001 require external references (REFPF and REFNF) to operate. See the Recommended Operating
Conditions for VREFPF and VREFNF voltage ranges.
The DACx1001 also contain dedicated sense pins, REFPS for REFPF and REFNS for REFNF. The reference
pins are unbuffered; therefore, use a reference driver circuit for these pins. Set the VREFVAL bits (address 02h)
as per a reference span equal to (VREFPF – VREFNF). For example, the VREFVAL bits must be set to 0100 for
VREFPF = 5 V and VREFNF = –5 V.
Figure 3 shows an example reference drive circuit for DACx1001. Table 1 shows the op-amp options for the
reference driver circuit.
Figure 3. Reference Drive Circuit
Table 1. Reference Op Amp Options
SELECTION PARAMETERS
OP AMPS
Low voltage and current noise
OPA211, OPA827, OPA828
Low offset and drift
OPA189
8.3.3 Output Buffers
The DACx1001 outputs are unbuffered. Use an external op amp to buffer the DAC output. The DAC output
voltage ranges from VREFPF to VREFNF. Two gain-setting resistors are integrated in the DACx1001. These
resistors are used to scale the DAC output, minimize the bias current mismatch of the external op amp, and
generate a negative reference for the REFNF pin. See the Embedded Resistor Configurations section for more
information. Table 2 shows the op amp options for the output drive circuit.
Table 2. Output Op Amp Options
SELECTION PARAMETERS
OP AMPS
Low bias current
OPA827, OPA828
Low noise
OPA211, OPA828
Low offset and drift
OPA189
Fast settling and low THD
OPA827, OPA828, OPA1612,
THS4011




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