OP15/OP17
2k⍀
0.1%
TEST CIRCUITS
+15V
V+
400⍀
0.1%
10V
0V
100k⍀
2
3
7
6
7
OP17
2N4416
100pF
5
2
3
1k⍀
0.1%
1
4
6
4
3k⍀
–15V
V
OUT
SUMMING
NODE
A
V
= –1
5k⍀
0.1%
NOTE:V
CAN BETRIMMEDWITH POTENTIOMETERS
OS
RANGING FROM 10k⍀TO 1M⍀. FOR MOST UNITS
TCV WILL BE MINIMIZEDWHEN V IS ADJUSTED
WITH A 100k⍀ POTENTIOMETER
OS
OS
SCOPE
+15V
2N4416
Figure 3. Input Offset Voltage Nulling
2k⍀
2k⍀
0.1%
Figure 6. OP17 Settling Time Test Circuit
+15V
APPLICATION INFORMATION
DynamicOperatingConsiderations
2k⍀
0.1%
10V
0V
2
3
7
OP15
4
6
As with most amplifiers, care should be taken with lead dress,
component placement and supply decoupling in order to ensure
stability. For example, resistors from the output to an input should
be placed with the body close to the input to minimize “pick-up”
and maximize the frequency of the feedback pole by minimizing
the capacitance for the input to ground.
2N4416
5k⍀
0.1%
100pF
3k⍀
–15V
V
OUT
SUMMING
NODE
A
V
= –1
5k⍀
0.1%
SCOPE
A feedback pole is created when the feedback around any amplifier
is resistive. The parallel resistance and capacitance from the input
of the device (usually the inverting input) to ac ground set the
frequency of this pole. In many instances the frequency of this
pole is much greater than the expected, 3 dB frequency of the
close-loop gain, and consequently there is negligible effect on
stability margin. However, if the feedback pole is less than approxi-
mately six times the expected 3 dB frequency, a lead capacitor
should be placed from the output to the negative input of the op
amp. T he value of the added capacitor should be such that the
RC time-constant of this capacitor and the resistance it parallels
is greater than, or equal to, the original feedback pole time is constant.
+15V
2N4416
2k⍀
Figure 4. OP15 Settling Time Test Circuit
R1
R2
10k⍀
5k⍀
C2
30pF
DIGITAL INPUTS
+10V
LSB
MSB
5
+15V
7
R
6
7
8
9
10 11
12
REF
5k⍀
B1 B2 B3 B4 B5 B6 B7 B8
14
15
4
2
2
3
V
I
O
REF+
6
DAC08E
OP15F
V
I
O
REF–
V+
V
= 0VTO 10V
O
4
V–
13
C
C
V
LC
3
16
1
C1
0.1F
+15V
–15V
–15V
Figure 5. Current-to-Voltage Amplifier Output
REV. A
–11–
ADI [ ADI ]
