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AD548JR-REEL bảng dữ liệu(PDF) 8 Page - Analog Devices |
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AD548JR-REEL bảng dữ liệu(HTML) 8 Page - Analog Devices |
8 / 8 page 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 - AD548JR-REEL |
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Mô tả tương tự - AD548JR-REEL |
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