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參數(shù)資料
| 型號(hào)： | REF102R |
| 英文描述： | Precision VOLTAGE REFERENCE |
| 中文描述： | 高精度電壓基準(zhǔn) |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 182K |
| 代理商： | REF102R |
REF102
6
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 DZ
1
, op amp A
1
, and resistor network R
1
–R
6
.
Approximately 8.2V is applied to the non-inverting input of
A
1
by DZ
1
. R
1
, R
2
, and R
3
are laser-trimmed to produce an
exact 10V output. The zener bias current is established from
the regulated output voltage through R
4
. R
5
allows user-
trimming of the output voltage by providing for small
external adjustment of the amplifier gain. Because the TCR
of R
5
closely matches the TCR of R
1
, R
2
and R
3
, 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 R
6
and roll off the high-frequency noise of the zener.
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 V
UPPER BOUND
and V
LOWER 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, V
1
to V
2
, is 2.75mV.
FIGURE 1. REF102CM Output Voltage Drift.
2.75mV
Worst-case
V
for
REF102CM
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.
Minimum range (
±
300mV) and minimal
degradation of drift.
FIGURE 3. REF102 Optional Output Voltage Adjust.
NOTES: (1) Lead resistances here of up to a few ohms have negligible
effect on performance. (2) A resistance of 0.1
in 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 R
S
and the internal resistors can introduce
some slight drift. This effect is minimized if R
S
is kept
significantly larger than the 50k
internal resistor. A TCR
of 100ppm/
°
C is normally sufficient.
REF102BM V
UPPER BOUND
+10.00275
V1
V
NOMINAL
+10.0000
V2
+9.99725
REF102BM V
LOWER BOUND
–25
0
+25
+50
+85
O
Temperature (°C)
REF102
1μF
Tantalum
+
R
L 1
R
L 2
R
L 3
V+
(1)
2
(2)
(2)
(1)
4
6
REF102
1μF
Tantalum
+
V+
2
4
20k
Output
Voltage
Adjust
+10V
5
V
TRIM
6
V
OUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REF102S | 制造商:BB 制造商全稱:BB 功能描述:Precision VOLTAGE REFERENCE |
| REF102SM | 制造商:BB 制造商全稱:BB 功能描述:10V Precision Voltage Reference |
| REF103FA-2.5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| REF104 | 制造商:General Tools 功能描述:BRIX REFRACTOMETER 28 TO 62% |
| REF105-SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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