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參數(shù)資料
| 型號(hào)： | AD548 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision, Low Power BiFET Op Amp |
| 中文描述： | 精密低功耗運(yùn)算放大器BiFET |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 430K |
| 代理商： | AD548 |
AD548
–10–
REV. C
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
=
1
V
log
10
(
I
2
/
I
1
)
Frequency compensation is provided by R11, R12, C1, and C2.
Small signal bandwidth is approximately 300 kHz at input cur-
rents above 100
μ
A 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
μ
A and adjust
V
OUT
to zero by adjusting the potentiometer on A3. Then set I
2
to 1
μ
A 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD548A | Precision, Low Power BiFET Op Amp |
| AD548AH | Precision, Low Power BiFET Op Amp |
| AD548AQ | Precision, Low Power BiFET Op Amp |
| AD548B | Precision, Low Power BiFET Op Amp |
| AD548BH | Precision, Low Power BiFET Op Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD548_02 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision, Low Power BiFET Op Amp |
| AD548A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision, Low Power BiFET Op Amp |
| AD548AH | 制造商:Analog Devices 功能描述: |
| AD548AN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OP-AMP|SINGLE|BIPOLAR/JFET|DIP|8PIN|PLASTIC |
| AD548AQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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