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參數(shù)資料
| 型號： | REF102CU |
| 英文描述： | 10V Precision Voltage Reference |
| 中文描述： | 10V的高精度電壓基準(zhǔn) |
| 文件頁數(shù)： | 5/15頁 |
| 文件大小： | 370K |
| 代理商： | REF102CU |
REF102
SBVS022A
5
www.ti.com
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25
°
C, V
S
= +15V, unless otherwise noted.
TYPICAL REF102 REFERENCE NOISE
6
4
2
0
2
4
6
Low Frequency Noise (1s/div)
(See Noise Test Circuit)
N
μ
V
–
OPA227
+
DUT
Noise Test Circuit.
100
μ
F
15.8k
20
2k
8k
2
μ
F
Oscilloscope
Gain = 100V/V
f = 0.1Hz and 10Hz
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 adjust-
ment of the amplifier gain. Because the temperature coeffi-
cient (TCR) of 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 by the more commonly-used
“
box
method.
”
The
“
box
”
is formed by the high and low specifica-
tion 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 known, either. It is, however,
bounded by V
UPPER BOUND
and V
LOWER BOUND
(see Figure 1).
Figure 1 uses the REF102CU 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.
REF102CU V
UPPER BOUND
+10.00275
V1
V
NOMINAL
+10.0000
2.75mV
Worst-case
V
for
REF102CU
V2
+9.99725
REF102CU V
LOWER BOUND
25
0
+25
+50
+85
O
Temperature (
°
C)
FIGURE 1. REF102CU Output Voltage Drift.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REF102CU/2K5 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Prec Vltg Ref RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| REF102CUG4 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| REF102M | 制造商:BB 制造商全稱:BB 功能描述:Precision VOLTAGE REFERENCE |
| REF102R | 制造商:BB 制造商全稱:BB 功能描述:Precision VOLTAGE REFERENCE |
| REF102S | 制造商:BB 制造商全稱:BB 功能描述:Precision VOLTAGE REFERENCE |
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