VRE107(2009_03) 데이터 시트보기 (PDF) - Cirrus Logic
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VRE107 Datasheet PDF : 5 Pages
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VRE107
Product Innova tionFrom
To remove this residual error, a nonlinear compensation network of thermistors and resistors is used in the VRE107
series references. This proprietary network eliminates most of the nonlinearity in the voltage vs. temperature func-
tion. By then adjusting the slope, The VRE107 series produces a very stable voltage over wide temperature ranges.
This network is less than 2% of the overall network resistance so it has a negligible effect on long term stability.
3. APPLICATION INFORMATION
The proper connection of the VRE107 series voltage reference is shown below with the optional trim resistors.
When trimming the VRE107, the positive voltage should be trimmed first since the negative voltage tracks the posi-
tive side. Pay careful attention to the circuit layout to avoid noise pickup and voltage drops in the lines.
The VRE107 series voltage references have the ground terminal brought out on two pins (pin 6 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 20 ppm. By con-
necting pin 7 to the power supply ground and pin 6 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 doesn’t effect performance.
EXTERNAL CONNECTIONS
3. Optional Fine Adjust for approximately ±10mV.
PIN CONFIGURATION
TOP VIEW
FINE -ADJ.
-5V
FINE -ADJ.
-PS
NC
REF. GND
GND
VRE107
FINE +ADJ.
+5V
FINE +ADJ.
+PS
NC
NC
NC
VRE107DS
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