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AD588JQ Datenblatt(PDF) 5 Page - Analog Devices

Teilenummer AD588JQ
Bauteilbeschribung  High Precision Voltage Reference
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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REV. D
AD588
–5–
Figure 2b shows GAIN and BALANCE trims in a +5 V and
–5 V tracking configuration. A 100 k
Ω 20-turn potentiometer is
used for each trim. The potentiometer for GAIN trim is con-
nected between Pin 6 (VHIGH) and Pin 8 (VLOW) with the 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.
Trimming in other configurations works in exactly the same
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
the center tap, –5 V.
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
approximately 150 k
Ω. The GAIN ADJUST trim network
effectively 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 potentiometer). The BAL ADJ trim network attenu-
ates the trim voltage by a factor of about 1400, providing a
trim range of
±4.5 mV with resolution of 450 µV/turn.
R3
RB
R1
R2
R4
R5
R6
–VS
+VS
A1
A4
AD588
A3
A2
SYSTEM
GROUND
+10V
+15V
+5V
–15V
SYSTEM
GROUND
0.1 F
0.1 F
Figure 2a. +10 V Output
R3
RB
R1
R2
R4
R5
R6
–VS
+VS
A1
A4
AD588
A3
A2
SYSTEM
GROUND
+5V
–15V
–5V
–15V
SYSTEM
GROUND
0.1 F
0.1 F
100k
20T
BALANCE
ADJUST
100k
20T
GAIN ADJUST
+15V
NOISE
REDUCTION
1 F
Figure 2b. +5 V and –5 V Outputs
Table I. Pin Connections
Connect
Buffered
Pin 10
Unbuffered
* Output on Pins
Output
Buffered Output on Pins
Range
to Pin:
–10 V
–5 V
0 V
+5 V
+10 V
Connections
–10 V
–5 V
0 V
+5 V
+10 V
+10 V
8
8
11
6
11 to 13, 14 to 15
15
6 to 4, and 3 to 1
1
–5 V or +5 V
11
8
11
6
8 to 13, 14 to 15,
15
6 to 4, and 3 to 1
1
–10 V
6
8
11
6
8 to 13, 14 to 15,
15
11 to 4, and 3 to 1 1
+5 V
11
6
6 to 4 and 3 to 1
1
–5 V118
8 to 13 and 14 to 15
15
*Unbuffered outputs should not be loaded.


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