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DAC8801 датащи(PDF) 10 Page - Texas Instruments

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номер детали DAC8801
подробное описание детали  14-Bit, Serial Input Multiplying Digital-to-Analog Converter
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

DAC8801 датащи(HTML) 10 Page - Texas Instruments

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APPLICATION INFORMATION
Stability Circuit
_
+
VDD
RFB
IOUT
GND
U1
VDD
VREF
VOUT
C1
U2
VREF
Positive Voltage Output Circuit
GND
OPA277
−2.5 V
GND
0 3 VOUT 3 +2.5 V
VOUT
IOUT
OPA277
C1
RFB
DAC8801
VDD
VDD
+2.5V Reference
VIN
VOUT
VREF
+
+
DAC8801
SLAS403B – NOVEMBER 2004 – REVISED FEBRUARY 2007
For a current-to-voltage design as shown in Figure 20, the DAC8801 current output (IOUT) and the connection
with the inverting node of the op amp should be as short as possible and according to correct PCB layout
design. For each code change there is a step function. If the GBP of the op amp is limited and parasitic
capacitance is excessive at the inverting node then gain peaking is possible. Therefore, for circuit stability, a
compensation capacitor C1 (4 pF to 20 pF typ) can be added to the design as shown in Figure 20.
Figure 20. Gain Peaking Prevention Circuit With Compensation Capacitor
As shown in Figure 21, in order to generate a positive voltage output, a negative reference is input to the
DAC8801. This design is suggested instead of using an inverting amp to invert the output due to tolerance
errors of the resistor. For a negative reference, VOUT and GND of the reference are level-shifted to a virtual
ground and a -2.5 V input to the DAC8801 with an op amp.
Figure 21. Positive Voltage Output Circuit
10
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