OP467 Analog Devices, OP467 Datasheet - Page 16

• Manufacturer Part Number: OP467
• Description: Quad Precision, High Speed Operational Amplifier
• Manufacturer: Analog Devices

Specifications of OP467

• -3db Bandwidth: 28MHz
• Slew Rate: 170V/µs
• Vos: 200µV
• Ib: 150nA
• # Opamps Per Pkg: 4
• Input Noise (nv/rthz): 6nV/rtHz
• Vcc-vee: 9V to 36V
• Isy Per Amplifier: 2.5mA
• Packages: DIP,LCC,SOIC

OP467
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 a variety
of applications. The circuit in Figure 50 is a unipolar quad DAC
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.
Figure 51 and Figure 52 show the full-scale settling time of the
outputs. To obtain reliable circuit performance, keep the traces
from the I
short to minimize parasitic capacitance.
100
0%
90
10
OUT A
OUT B
OUT
2V
of the DAC to the inverting inputs of the OP467
Figure 51. Falling Edge Output Settling Time
0.1µF
0.1µF
50mV
1
7
+15V
–15V
OP467
OP467
11
4
5
3
6
2
260.0ns
C1
10pF
C2
10pF
100ns
+10V
+10V
+5V
Figure 50. Quad DAC Unipolar Operation
10
11
12
13
14
1
2
3
4
5
6
7
8
9
R
I
I
I
I
R
DB0 (LSB)
DB1
DB3
DB4
V
V
V
DB2
DB5
OUT 1A
OUT 2A/
OUT 2B
OUT 1B
DD
REF
FB
FB
REF
A
B
A
B
Rev. | Page 16 of 20
DAC8408
(MSB) DB7
I
I
OUT 2C/
I
I
V
OUT 1C
OUT 2D
OUT 1D
V
DGND
R
R
REF
REF
DS2
R/W
DB6
FB
FB
DS1
A/B
DAC8408
I
C
D
D
C
R
OUT
FB
22
19
18
17
16
15
28
27
26
25
24
23
21
20
100
0%
90
10
+10V
DIGITAL
CONTROL
SIGNALS
3pF
+10V
OP467
2V
I-V
Figure 52. Rising Edge Output Settling Time
Figure 53. DAC V
2kΩ
50mV
DC OFFSET
C3
10pF
C4
10pF
2kΩ
OUT
Settling Time Circuit
13
12
10
9
60.4kΩ
OP467
OP467
AD847
604Ω
251.0ns
14
8
100ns
1kΩ
OUT D
OUT C
50kΩ