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ADL5315 Datasheet(PDF) 11 Page - Analog Devices |
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ADL5315 Datasheet(HTML) 11 Page - Analog Devices |
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11 / 20 page  ADL5315 Rev. 0 | Page 11 of 20 APPLICATIONS The ADL5315 is primarily designed for wide dynamic range applications, simplifying power monitoring designs where access is only permitted to the cathode of a PIN photodiode or receiver module. Figure 22 shows a typical application where the ADL5315 is used to provide an accurate bias to a PIN diode while simultaneously mirroring the diode current to be measured by a translinear logarithmic amplifier. In this application, the ADL5315 sets the bias voltage on the PIN diode. This voltage is delivered at the INPT pin and is controlled by the voltage at the VSET pin. VSET is driven by the on-board reference VSREF, which is equal to VPOS − 1 V. The input current, IINPT, is precisely mirrored at a ratio of 1:1 to the IOUT pin. This interface is optimized for use with any of ADI’s translinear logarithmic amplifiers (for example, the AD8304 or AD8305) to offer a precise, wide dynamic range measurement of the optical power incident upon the PIN. If a linear voltage output is preferred at IOUT, a single external resistor to ground is all that is necessary to perform the conversion. AVERAGE POWER MONITORING In applications where a modulated signal is incident upon the photodiode, the average power of the signal can be measured. Figure 21 shows the connections necessary for using the ADL5315 in such a measurement system. The value of the capacitor to ground should be selected to eliminate errors due to modulation of the ADL5315 input current. VOLTAGE REFERENCE CURRENT LIMITING COMM VSET NC INPT DATA PATH LINEAR VOLTAGE OUTPUT IPD CURRENT MIRROR 1:1 ADL5315 4 2 7 SREF 3 1 6 VPOS PIN 20k Ω 5 RLIM CSET VPOS 8 IOUT IPD TIA Figure 21. Average Power Monitoring Using the ADL5315 VOLTAGE REFERENCE CURRENT LIMITING COMM VSET NC INPT DATA PATH OPTICAL POWER TRANSLINEAR LOG AMP AD8304, AD8305, ETC. THIS CONNECTION IS NOT NECESSARY, BUT REDUCES ERRORS DUE TO LEAKAGE CURRENTS AT LOW SIGNAL LEVELS. IPD CURRENT MIRROR 1:1 ADL5315 4 2 7 SREF 3 1 6 VPOS VPOS PIN 20k Ω 5 RLIM RLIM RLIM = 48V ILIM ILIM = 1mA – 16mA – 3k Ω 8 IOUT VSUM INPT IPD TIA VSREF = VPOS – 1V VSET = VINPT NODE VOLTAGES Figure 22. Typical Application Using the ADL5315 |
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