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参数资料
| 型号： | VRE304-6CD |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | THREE TERM VOLTAGE REFERENCE, PDIP8 |
| 文件页数： | 4/6页 |
| 文件大小： | 436K |
| 代理商： | VRE304-6CD |
DISCUSSION OF PERFORMANCE
VRE304-6DS REV. D JUN 1999
THEORY OF OPERATION
The following discussion refers to the schematic in
figure 2 below. A FET current source is used to bias a
6.3V zener diode. The zener voltage is divided by the
resistor network R1 and R2. This voltage is then applied
to the noninverting input of the operational amplifier which
amplifies the voltage to produce a 4.096V output. The
gain is determined by the resistor networks R3 and R4:
G=1 + R4/R3. The 6.3V zener diode is used because it is
the most stable diode over time and temperature.
The current source provides a closely regulated zener
current, which determines the slope of the references’
voltage vs. temperature function. By trimming the zener
current a lower drift over temperature can be achieved.
But since the voltage vs. temperature function is nonlinear
this compensation technique is not well suited for wide
temperature ranges.
Thaler
Corporation
has
developed
a
nonlinear
compensation network of thermistors and resistors that is
used
in
the
VRE
series
voltage
references.
This
proprietary network eliminates most of the nonlinearity in
the voltage vs. temperature function. By adjusting the
slope, Thaler Corporation produces a very stable voltage
over wide temperature ranges.
VRE304-6
FIGURE 2
This network is less than 2% of the overall network
resistance so it has a negligible effect on long term
stability.
Figure 3 shows the proper connection of the VRE304-6
series voltage references with the optional trim resistor for
initial error and the optional capacitor for noise reduction.
The VRE304-6 reference has the ground terminal brought
out on two pins (pin 4 and pin 7) which are connected
together internally. This allows the user to achieve greater
accuracy when using a socket. Voltage references have a
voltage drop across their power supply ground pin due to
quiescent current flowing through the contact resistance.
If the contact resistance was constant with time and
temperature, this voltage drop could be trimmed out.
When the reference is plugged into a socket, this source
of error can be as high as 20ppm. By connecting pin 4 to
the power supply ground and pin 7 to a high impedance
ground point in the measurement circuit, the error due to
the contact resistance can be eliminated. If the unit is
soldered into place, the contact resistance is sufficiently
small that it does not effect performance. Pay careful
attention to the circuit layout to avoid noise pickup and
voltage drops in the lines.
EXTERNAL CONNECTIONS
FIGURE 3
8
4
6
5
+ V
OUT
2
+ V
IN
VRE304-6
10k?
C
N
1F
OPTIONAL
NOISE REDUCTION
CAPACITOR
OPTIONAL
FINE TRIM
ADJUSTMENT
3
V TEMP OUT
7
REF. GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| VRE304-6CS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| VRE304-6J | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Cost Precision Reference |
| VRE304-6JD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| VRE304-6JS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| VRE304-6K | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Cost Precision Reference |
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