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REF102M Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer REF102M
Beschreibung Precision VOLTAGE REFERENCE
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 9 Seiten
REF102M Datasheet, Funktion
®
REF102
REF102
REF102
Precision
VOLTAGE REFERENCE
FEATURES
q +10V ±0.0025V OUTPUT
q VERY LOW DRIFT: 2.5ppm/°C max
q EXCELLENT STABILITY:
5ppm/1000hr typ
q EXCELLENT LINE REGULATION:
1ppm/V max
q EXCELLENT LOAD REGULATION:
10ppm/mA max
q LOW NOISE: 5µVp-p typ, 0.1Hz to 10Hz
q WIDE SUPPLY RANGE: 11.4VDC to 36VDC
q LOW QUIESCENT CURRENT: 1.4mA max
q PACKAGE OPTIONS: HERMETIC TO-99,
PLASTIC DIP, SOIC
DESCRIPTION
The REF102 is a precision 10V voltage reference. The
drift is laser-trimmed to 2.5ppm/°C max (CM grade)
over the industrial temperature range and 5ppm/°C
max (SM grade) over the military temperature range.
The REF102 achieves its precision without a heater.
This results in low power, fast warm-up, excellent
stability, and low noise. The output voltage is ex-
tremely insensitive to both line and load variations and
can be externally adjusted with minimal effect on drift
and stability. Single supply operation from 11.4V to
36V and excellent overall specifications make the
REF102 an ideal choice for demanding instrumenta-
tion and system reference applications.
APPLICATIONS
q PRECISION-CALIBRATED VOLTAGE
STANDARD
q D/A AND A/D CONVERTER REFERENCE
q PRECISION CURRENT REFERENCE
q ACCURATE COMPARATOR THRESHOLD
REFERENCE
q DIGITAL VOLTMETERS
q TEST EQUIPMENT
q PC-BASED INSTRUMENTATION
Trim
5
V+
2
R5 50k
R2
R3
14k
R1 22k
8k
A1
+
R6 7k
R4
DZ1 4k
84
Noise Common
Reduction
6
VOUT
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1989 Burr-Brown Corporation
PDS-900E
Printed in U.S.A. October, 1993






REF102M Datasheet, Funktion
THEORY OF OPERATION
Refer to the diagram on the first page of this data sheet. The
10V output is derived from a compensated buried zener
diode DZ1, op amp A1, and resistor network R1–R6.
Approximately 8.2V is applied to the non-inverting input of
A1 by DZ1. R1, R2, and R3 are laser-trimmed to produce an
exact 10V output. The zener bias current is established from
the regulated output voltage through R4. R5 allows user-
trimming of the output voltage by providing for small
external adjustment of the amplifier gain. Because the TCR
of R5 closely matches the TCR of R1, R2 and R3 , the voltage
trim has minimal effect on the reference drift. The output
voltage noise of the REF102 is dominated by the noise of the
zener diode. A capacitor can be connected between the
Noise Reduction pin and ground to form a low-pass filter
with R6 and roll off the high-frequency noise of the zener.
INSTALLATION AND
OPERATING INSTRUCTIONS
BASIC CIRCUIT CONNECTION
Figure 2 shows the proper connection of the REF102. To
achieve the specified performance, pay careful attention to
layout. A low resistance star configuration will reduce volt-
age errors, noise pickup, and noise coupled from the power
supply. Commons should be connected as indicated being
sure to minimize interconnection resistances.
(1)
2 (2)
V+ 6
+ 1µF
Tantalum REF102 RL 1 RL 2 RL 3
DISCUSSION
OF PERFORMANCE
The REF102 is designed for applications requiring a preci-
sion voltage reference where both the initial value at room
temperature and the drift over temperature are of importance
to the user. Two basic methods of specifying voltage refer-
ence drift versus temperature are in common usage in the
industry—the “butterfly method” and the “box method.”
The REF102 is specified with the more commonly used
“box method.” The “box” is formed by the high and low
specification temperatures and a diagonal, the slope of
which is equal to the maximum specified drift.
Since the shape of the actual drift curve is not known, the
vertical position of the box is not exactly known either. It is,
however, bounded by VUPPER BOUND and VLOWER BOUND (see
Figure 1). Figure 1 uses the REF102CM as an example. It
has a drift specification of 2.5ppm/°C maximum and a
specification temperature range of –25°C to +85°C. The
“box” height, V1 to V2, is 2.75mV.
+10.00275
REF102BM VUPPER BOUND
V1
VNOMINAL
+10.0000
V2
+9.99725
REF102BM VLOWER BOUND
–25 0 +25 +50
Temperature (°C)
2.75mV
Worst-case
VOUT for
REF102CM
+85
FIGURE 1. REF102CM Output Voltage Drift.
4
(1) (2)
NOTES: (1) Lead resistances here of up to a few ohms have negligible
effect on performance. (2) A resistance of 0.1in series with these
leads will cause a 1mV error when the load current is at its maximum of
10mA. This results in a 0.01% error of 10V.
FIGURE 2. REF102 Installation.
OPTIONAL OUTPUT VOLTAGE ADJUSTMENT
Optional output voltage adjustment circuits are shown in
Figures 3 and 4. Trimming the output voltage will change
the voltage drift by approximately 0.008ppm/°C per mV of
trimmed voltage. In the circuit in Figure 3, any mismatch in
TCR between the two sections of the potentiometer will also
affect drift, but the effect of the TCR is reduced by a factor
of five by the internal resistor divider. A high quality
potentiometer, with good mechanical stability, such as a
cermet, should be used. The circuit in Figure 3 has a
minimum trim range of ±300mV. The circuit in Figure 4 has
less range but provides higher resolution. The mismatch in
TCR between RS and the internal resistors can introduce
some slight drift. This effect is minimized if RS is kept
significantly larger than the 50kinternal resistor. A TCR
of 100ppm/°C is normally sufficient.
V+
2
VOUT
6
+ 1µF
Tantalum
REF102
VTRIM
5
4
20k
Output
Voltage
Adjust
+10V
Minimum range (±300mV) and minimal
degradation of drift.
FIGURE 3. REF102 Optional Output Voltage Adjust.
®
REF102
6

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