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AD548AH bảng dữ liệu(PDF) 8 Page - Analog Devices

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AD548AH bảng dữ liệu(HTML) 8 Page - Analog Devices

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AD548
–8–
REV. C
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Figure 30. Log Ratio Amplifier
compensation is provided by resistors R8 and R15, which 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 ad-
just 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 adjust-
ment 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 volt-
age accuracy of this circuit is limited by the input offset voltage
and drift of the AD548.
TO-99 (H) Package
SOIC (R) Package
Plastic Mini-DIP (N) Package
Cerdip (Q) Package


Số phần tương tự - AD548AH

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
AD548 AD-AD548 Datasheet
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REV. D
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AD548SH AD-AD548SH Datasheet
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AD548 AD-AD548_02 Datasheet
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AD548 AD-AD548_15 Datasheet
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Mô tả tương tự - AD548AH

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
AD548SH AD-AD548SH Datasheet
221Kb / 12P
   Precision, Low Power BiFET Op Amp
REV. D
AD548 AD-AD548_02 Datasheet
221Kb / 12P
   Precision, Low Power BiFET Op Amp
REV. D
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
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AD648 AD-AD648 Datasheet
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AD648 AD-AD648_15 Datasheet
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AD642 AD-AD642 Datasheet
395Kb / 6P
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AD642 AD-AD642_15 Datasheet
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AD711JRZ AD-AD711JRZ Datasheet
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   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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