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AD588
Figure 5 shows gain and balance trims in a +5 V and ?5 V
39k ?
+15V
tracking configuration. A 100 kΩ, 20-turn potentiometer
is used for each trim. The potentiometer for gain trim is
connected between Pin 6 (V HIGH ) and Pin 8 (V LOW ) with the
1μF
NOISE
REDUCTION
wiper connected to Pin 5 (GAIN ADJ). The potentiometer is
adjusted to produce exactly 10 V between Pin 1 and Pin 15, the
amplifier outputs. The balance potentiometer, also connected
between Pin 6 and Pin 8 with the wiper to Pin 12 (BAL ADJ), is
then adjusted to center the span from +5 V to ?5 V.
R B
R2
A1
R1
R4
R5
AD588
A3
A4
+5V
–5V
Trimming in other configurations works in exactly the same
+V S
+15V
manner. When producing +10 V and +5 V, GAIN ADJ is used
to trim +10 V and BAL ADJ is used to trim +5 V. In the ?10 V
and ?5 V configuration, GAIN ADJ is again used to trim the
magnitude of the span, ?10 V, while BAL ADJ is used to trim
R3
A2
R6
–V S
0.1μF
0.1μF
SYSTEM
GROUND
–15V
the center tap, ?5 V.
Trimming the AD588 introduces no additional errors over
temperature, so precision potentiometers are not required. For
single-output voltage ranges, or in cases when balance adjust is
not required, Pin 12 should be connected to Pin 11. If gain
adjust is not required, Pin 5 should be left floating.
SYSTEM
GROUND
100k ?
20T
BALANCE
ADJUST
100k ?
20T
GAIN ADJUST
Figure 5. +5 V and ?5 V Outputs
In single output configurations, GAIN ADJ is used to trim
outputs utilizing the full span (+10 V or ?10 V), while BAL ADJ
is used to trim outputs using half the span (+5 V or ?5 V).
Input impedance on both the GAIN ADJ and BAL ADJ pins is
0.1μF
NOISE
approximately 150 kΩ. The GAIN ADJ trim network effectively
0.1μF
7
REDUCTION
6
4
3
attenuates the 10 V across the trim potentiometer by a factor of
about 1500 to provide a trim range of ?3.5 mV to +7.5 mV with
a resolution of approximately 550 μV/turn (20-turn potentiome-
R B
A3
1
–5V
ter). The BAL ADJ trim network attenuates the trim voltage by
a factor of about 1400, providing a trim range of ±4.5 mV with
A1
R1
R4
AD588
14
resolution of 450 μV/turn.
R2
R5
A4
15
–10V
7
6
4
3
+V S 2
+15V
R3
R6
0.1μF
R B
A1
R1
R4
A3
1
14
+10V
5
9
A2
10
8
12
11
13
–V S 16
SYSTEM
GROUND
0.1μF
–15V
SYSTEM
R2
R5
A4
15
+5V
GROUND
R3
A2
R6
+V S 2
AD588
–V S 16
0.1μF
0.1μF
+15V
SYSTEM
GROUND
Figure 6. ?10 V Output
5
9
10
8
12
11
13
–15V
SYSTEM
GROUND
Figure 4. +10 V Output
Rev. L | Page 8 of 20
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