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VRE410B датащи(PDF) 4 Page - Cirrus Logic |
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VRE410B датащи(HTML) 4 Page - Cirrus Logic |
4 / 5 page P r o d u c t I n n o v a t i o n F r o m VRE410 4 VRE410DS .ThEORYOFOPERaTION The following discussion refers to the block diagram in Figure 1. In operation, approximately 6.3 V is applied to the noninverting input of the op amp. The voltage is amplified by the op amp to produce a 10 V output. The gain is determined by the networks R1 and R2: G=1 + R2/R1. The 6.3 V zener diode is used because it is the most stable diode over time and temperature. The zener operating current is derived from the regulated output voltage through R3. This feedback arrangement provides a closely regulated zener current. This current determines the slope of the references’ voltage vs. tempera- ture 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. A nonlinear compensation network of thermistors and resistors is used in the VRE series voltage references. This proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. By then adjusting the slope, a very stable voltage is produced over wide temperature ranges. The VRE400 series voltage references have the ground terminal brought out on two pins (pin 6 and 7) which are connected together internally. This allows the user to achieve greater accuracy when using a socket. Voltage ref- erences 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. PINCONFIGuRaTION 11 12 13 14 VRE410 TOP VIEW 1 2 3 4 N/C +VIN GND REF. GND +VOUT 5 6 7 10 9 8 - V OUT N/C - V IN N/C N/C N/C N/C N/C N/C |
Аналогичный номер детали - VRE410B |
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Аналогичное описание - VRE410B |
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