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AD548 bảng dữ liệu(PDF) 10 Page - Analog Devices

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Giải thích chi tiết về linh kiện  Precision, Low Power BiFET Op Amp
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AD548 bảng dữ liệu(HTML) 10 Page - Analog Devices

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AD548
–10–
REV. D
Figure 10. Log Ratio Amplifier
compensation is provided by resistors R8 and R15 that have a
positive 3500 ppm/
°C temperature coefficient. The transfer
function for the output voltage is:
V
OUT
= 1V log
10 ( I2 / I1 )
Frequency compensation is provided by R11, R12, C1, and C2.
Small signal bandwidth is approximately 300 kHz at input cur-
rents above 100
µA and will proportionally decrease with lower
signal levels. D1, D2, R13, and R14 compensate for the effects
of the two logging transistors’ ohmic emitter resistance.
To trim this circuit, set the two input currents to 10
µA and adjust
VOUT to zero by adjusting the potentiometer on A3. Then set I2
to 1
µA and adjust the scale factor such that the output voltage is
1 V by trimming potentiometer R10. Offset adjustment for A1 and
A2 is provided to increase the accuracy of the voltage inputs.
This circuit ensures a 1% log conformance error over an input
current range of 300 pA to 1 mA, with low level accuracy
limited by the AD548’s input current. The low level input voltage
accuracy of this circuit is limited by the input offset voltage and
drift of the AD548.


Số phần tương tự - AD548_02

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
AD548A AD-AD548A Datasheet
198Kb / 8P
   Precision, Low Power BiFET Op Amp
REV. B
AD548AH AD-AD548AH Datasheet
198Kb / 8P
   Precision, Low Power BiFET Op Amp
REV. B
AD548AQ AD-AD548AQ Datasheet
198Kb / 8P
   Precision, Low Power BiFET Op Amp
REV. B
AD548B AD-AD548B Datasheet
198Kb / 8P
   Precision, Low Power BiFET Op Amp
REV. B
AD548BH AD-AD548BH Datasheet
198Kb / 8P
   Precision, Low Power BiFET Op Amp
REV. B
More results

Mô tả tương tự - AD548_02

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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Analog Devices
AD548SH AD-AD548SH Datasheet
221Kb / 12P
   Precision, Low Power BiFET Op Amp
REV. D
AD548 AD-AD548 Datasheet
198Kb / 8P
   Precision, Low Power BiFET Op Amp
REV. B
AD548KNZ AD-AD548KNZ Datasheet
221Kb / 12P
   Precision, Low Power BiFET Op Amp
REV. D
AD548 AD-AD548_15 Datasheet
221Kb / 12P
   Precision, Low Power BiFET Op Amp
REV. D
AD648 AD-AD648 Datasheet
335Kb / 12P
   Dual Precision, Low Power BiFET Op Amp
REV. C
AD648 AD-AD648_15 Datasheet
209Kb / 12P
   Dual Precision, Low Power BiFET Op Amp
REV. E
AD642 AD-AD642 Datasheet
395Kb / 6P
   Precision, Low Cost Dual BiFET Op Amp
REV. 0
AD642 AD-AD642_15 Datasheet
399Kb / 6P
   Precision, Low Cost Dual BiFET Op Amp
REV. 0
AD711JRZ AD-AD711JRZ Datasheet
543Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711 AD-AD711_15 Datasheet
717Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
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