參數(shù)資料
型號(hào)： OP467
廠商： Analog Devices, Inc.
英文描述： Quad Precision, High Speed Operational Amplifier
中文描述： 四精密，高速運(yùn)算放大器
文件頁數(shù)： 14/16頁
文件大?。?/td> 242K
代理商： OP467
OP467
REV. C
–14–
FAST I-TO-V CONVERTER
The fast slew rate and fast settling time of the OP467 are well
suited to the fast buffers and I-to-V converters used in variety of
applications. The circuit in Figure 46 is a unipolar quad D/A
converter consisting of only two ICs. The current output of the
DAC8408 is converted to a voltage by the OP467 configured as
an I-to-V converter. This circuit is capable of settling to 0.1%
within 200 ns. Figures 47 and 48 show the full-scale settling
time of the outputs. To obtain reliable circuit performance, keep
the traces from the DAC’s I
OUT
to the inverting inputs of the
OP467 short to minimize parasitic capacitance.
10
0%
100
90
260.0ns
2V
50mV
100ns
Figure 47. Voltage Output Settling Time
15
V
DD
V
REF
A
R
FB
A
I
OUT
1A
I
OUT
2A/
I
OUT
2B
I
OUT
1B
R
FB
B
V
REF
B
DGND
R
FB
C
I
OUT
1C
I
OUT
2C/
I
OUT
2D
I
OUT
1D
V
REF
C
R
FB
D
V
REF
D
DAC8408
+5V
+10V
+10V
V
OUT
A
V
OUT
B
0.1
m
F
+15V
–15V
C2
10pF
C1
10pF
0.1
m
F
7
OP467
5
4
11
6
OP467
2
3
1
1
2
3
7
8
9
10
11
12
4
5
6
13
14
+
+10V
+10V
V
OUT
A
V
OUT
B
DIGITAL
CONTROL
SIGNALS
C3
10pF
C4
10pF
14
12
13
OP467
+
DB0 (LSB)
DB1
DB2
DB3
DB4
DB5
8
10
9
OP467
+
(MSB) DB7
DB6
28
27
26
22
21
20
19
18
17
25
24
23
16
–
+
–
R/
W
A/
B
DS1
DS2
Figure 46. Quad DAC Unipolar Operation
10
0%
100
90
251.0ns
2V
50mV
100ns
Figure 48. Voltage Output Settling Time
R
FB
I
OUT
3pF
OP467
I-V
DAC-8408
1k
V
50
V
604
V
60.4
V
2k
V
DC OFFSET
2k
V
AD847
Figure 49. DAC V
OUT
Settling Time Circuit
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