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Op Amp with Standard SO-8 Pinout and Disable/SHDN—For op amps that disable the output when
high, Table 3 shows different ways to set up the voltage for pin 8 using R
8
, R
9
and C
7
. Use the values
listed in Table 2 for the other components, except for the changes shown in Table 4 ; note that these are
all single-supply configurations.
Table 3. Disable Pin
CONFIGURATION R
8
C
9
External Source Open 49.9 Ω
On Open 0 Ω
Off 0 Ω Open
Table 4. Changes
SINGLE- SINGLE- SINGLE-
SUPPLY SUPPLY SUPPLY
COMPONENT (G = +2) (G = –1) (G = +1)
C
4
0 Ω 0 Ω 0 Ω
For op amps that disable the output when low, Table 5 shows different ways to set up the voltage on pin 8
using R
8
, R
9
and C
7
. Refer to Table 2 for the other component values.
Table 5. Disable Pin
CONFIGURATION R
8
R
9
C
7
External Source Open 49.9 Ω Open
On Open Open 0.1 µ F
Off Open 0 Ω Open
Op Amp with Standard SO-8 Pinout and Limiters—A VLA (Voltage Limiting Amplifier) has two inputs
(V
H
and V
L
in Table 2 ) which limit the output voltage swing. Table 6 shows different ways to set up pin 5
and pin 8 voltages using R
8
– R
13
and C
5
– C
7
. Use the values listed in Table 2 for the other components.
Note that this board would require modification for a single-supply circuit. In dual-supply applications,
using R
10
instead of R
8
makes V
H
negative, and using R
13
instead of R
11
makes V
L
positive.
Table 6. Limiting Pins
SINGLE-
DUAL-SUPPLY DUAL-SUPPLY SUPPLY
COMPONENT (G = +2) (G = –1) (G = +1)
R
8
3.01k Ω 3.01k Ω 549 Ω
R
9
1.91k Ω 1.91k Ω 1.58k Ω
R
11
3.01k Ω 3.01k Ω Open
R
12
1.91k Ω 1.91k Ω 549 Ω
R
13
Open Open 1.58k Ω
C
5
– C
7
0.1 µ F 0.1 µ F 0.1 µ F
DEM-OPA-SO-1A Demonstration Fixture4 SBOU009A – June 1998 – Revised March 2006
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