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DAC8811ICDRBT Datasheet(数据表) 10 Page - Texas Instruments

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部件型号  DAC8811ICDRBT
说明  16-Bit, Serial Input Multiplying Digital-to-Analog Converter
下载  21 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
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GND
OPA277
−2.5V
GND
0 3 VOUT 3 +2.5V
VOUT
IOUT
OPA277
C1
RFB
DAC8811
VDD
VDD
+2.5V Reference
VIN
VOUT
VREF
+
+
Bipolar Output Circuit
V
OUT
+
D
32, 768 *
1
V
REF
(2)
R
FB
OPA277
U4
−2.5V 3 VOUT 3 +2.5V
(−10V 3 VOUT 3 +10V)
VOUT
10 kW
10 kW
+2.5V
(+10V)
VREF
VDD
VDD
GND
DAC8811
OPA277
U2
IOUT
C1
C2
5 kW
+
+
Programmable Current Source Circuit
I
L +
(R2
)R3)
R1
R3
V
REF
D
(3)
DAC8811
SLAS411B – NOVEMBER 2004 – REVISED FEBRUARY 2007
APPLICATION INFORMATION (continued)
Figure 21. Positive Voltage Output Circuit
The DAC8811, as a 2-quadrant multiplying DAC, can be used to generate a unipolar output. The polarity of the
full-scale output IOUT is the inverse of the input reference voltage at VREF.
Some applications require full 4-quadrant multiplying capabilities or bipolar output swing. As shown in Figure 22,
external op amp U4 is added as a summing amp and has a gain of 2X that widens the output span to 5 V. A
4-quadrant multiplying circuit is implemented by using a 2.5-V offset of the reference voltage to bias U4.
According to the circuit transfer equation given in Equation 2, input data (D) from code 0 to full scale produces
output voltages of VOUT = -2.5 V to VOUT = +2.5 V.
External resistance mismatching is the significant error in Figure 22.
Figure 22. Bipolar Output Circuit
A DAC8811 can be integrated into the circuit in Figure 23 to implement an improved Howland current pump for
precise voltage to current conversions. Bidirectional current flow and high voltage compliance are two features of
the circuit. With a matched resistor network, the load current of the circuit is shown by Equation 3:
10
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