25k鈩?/div>
5
+10V Out
鈥?0V Out
Both of the V
OUT
errors are adjustable to zero as shown in
Figure 2. Because the adjustment range is small, instability
in the trim components is negligible. Since the +V
OUT
adjust-
ment affects 鈥揤
OUT
, adjust +V
OUT
first.
If you need a 1ppm/擄C reference, use the REF101 as shown
in Figure 3. The REF101 contains the precision resistors
needed for the 鈥?0V inverter. For a
鹵10.0V
reference, the
only additional component needed is an op amp. The 0.6碌V/
擄C
V
OS
/dT of the OPA27AM adds a negligible 0.06ppm/擄C
drift to the negative reference.
For lowest parts cost, consider the
鹵10V
reference shown in
Figure 4. The unity-gain-inverting amplifier in this circuit
uses 1% resistors and a 100鈩?pot to trim the 鈥?0.0V
reference output. When using standard 1% film resistors, a 鈥?/div>
V
OUT
drift of 50ppm/擄C or more should be expected.
The REF101 and REF102 are buried-zener-based references.
They have better stability and much lower noise than stan-
dard band-gap-based voltage references. Still, there are in-
stances when even lower noise is required. The standard way
to lower noise is to lower the noise bandwidth at the output
of the reference by filtering (see Application Bulletin 3).
The circuit shown in Figure 5 includes noise reduction filters
on both the +10V and 鈥?0V reference outputs. The improved
filter design shown has several advantages:
1) low output impedance at high frequency for driving
dynamic loads,
2) improved noise filtering, and
3) ability to drive large capacitive loads.
FIGURE 1. Precision Two-Chip
鹵10.0V
Reference.
+15V
2
V+
10V
Out
REF102
Trim
Com
4
20鈩?/div>
6
5
20k鈩?/div>
+10V
Adj
10k鈩?/div>
2
25k鈩?/div>
20鈩?/div>
1k鈩?/div>
鈥?0V
Adj
10k鈩?/div>
3
1
25k鈩?/div>
25k鈩?/div>
INA105
25k鈩?/div>
6
5
+10V Out
鈥?0V Out
FIGURE 2. Precision Two-Chip
鹵10V
Reference with
鹵V
OUT
Trim.
漏
1990 Burr-Brown Corporation
AB-005
Printed in U.S.A. June, 1995
AB-005相關(guān)型號(hào)PDF文件下載
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英文版
AB-001 - INCREASING INA117 DIFFERENTIAL INPUT RANGE
ETC
-
英文版
AB-002 - MAKE A PRECISION CURRENT SOURCE OR CURRENT SINK
ETC
-
英文版
AB-003 - VOLTAGE-REFERENCE FILTERS
ETC
-
英文版
AB-004 - MAKE A PRECISION -10V REFERENCE
ETC
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英文版
AB-005 - Make A Precision -10V Reference
ETC
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英文版
AB-006 - Make a -10V to +10V Adjustable Precision Voltage So...
ETC
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英文版
AB-007 - CLASSICAL OP AMP OR CURRENT-FEEDBACK OP AMP?
ETC
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英文版
AB-008 - AC COUPLING INSTRUMENTATION AND DIFFERENCE AMPLIFIE...
ETC
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英文版
AB-009 - SINGLE-SUPPLY OPERATION OF ISOLATION AMPLIFIERS
ETC
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英文版
AB-010 - -200V DIFFERENCE AMPLIFIER WITH COMMON-MODE VOLTAGE...
ETC
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英文版
AB-011 - LOW POWER SUPPLY VOLTAGE OPERATION OF REF102 10.0V ...
ETC
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英文版
AB-012 - BOOST ISO120 BANDWIDTH TO MORE THAN 100kHz
ETC
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英文版
AB-013 - INCREASING ADC603 INPUT RANGE
ETC
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英文版
AB-014 - INPUT OVERLOAD PROTECTION FOR THE RCV420 4-20mA CUR...
ETC
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英文版
AB-015 - EXTENDING THE COMMON-MODE RANGE OF DIFFERENCE AMPLI...
ETC
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英文版
AB-016 - BOOST AMPLIFIER OUTPUT SWING WITH SIMPLE MODIFICATI...
ETC
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英文版
AB-017 - Sallen-Key Low-Pass Filter Design Program
ETC
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英文版
AB-018 - 0 TO 20mA RECEIVER USING RCV420
ETC
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英文版
AB-019 - USING THE ADS7800 12 BIT ADC WITH UNIPOLAR INPUT SI...
ETC
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英文版
AB-020 - BURR-BROWN SPICE BASED MACROMODELS. REV. F
ETC
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