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| 型号： | REF102CM |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY8 |
| 封装： | METAL, TO-99, 8 PIN |
| 文件页数： | 15/19页 |
| 文件大小： | 608K |
| 代理商： | REF102CM |
REF102
5
SBVS022B
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = +15V, unless otherwise noted.
TYPICAL REF102 REFERENCE NOISE
6
4
2
0
2
4
6
Low Frequency Noise (1s/div)
(See Noise Test Circuit)
Noise
Voltage
(
V)
–
+
OPA227
DUT
Noise Test Circuit.
100
F
15.8k
20
2k
8k
2
F
Oscilloscope
Gain = 100V/V
f
= 0.1Hz and 10Hz
3dB
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 adjust-
ment of the amplifier gain. Because the temperature coeffi-
cient (TCR) of 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.
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 specification tempera-
tures 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 VUPPER BOUND and VLOWER 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,
V1 to V2, is 2.75mV.
REF102CU V
UPPER BOUND
+10.00275
V1
V
NOMINAL
+10.0000
2.75mV
Worst-case
V
OUT for
REF102CU
V2
+9.99725
REF102CU V
LOWER BOUND
25
0
+25
+50
+85
Output
Voltage
(V)
Temperature (
°C)
FIGURE 1. REF102CU Output Voltage Drift.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REF102CP | 功能描述:基准电压& 基准电流 Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF102CP | 制造商:Texas Instruments 功能描述:IC VOLT REFERENCE 10V |
| REF102CPG4 | 功能描述:基准电压& 基准电流 Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF102CU | 功能描述:基准电压& 基准电流 Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF102CU/2K5 | 功能描述:基准电压& 基准电流 Prec Vltg Ref RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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