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ADL5315
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
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.
controlled by the voltage at the VSET pin. VSET is driven by
the on-board reference V SREF , which is equal to V POS ? 1 V.
VOLTAGE
ADL5315
CURRENT
V POS
The input current, I INPT , is precisely mirrored at a ratio of 1:1 to
the IOUT pin. This interface is optimized for use with any of
4
REFERENCE
COMM
LIMITING
RLIM
5
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.
C SET
3
20k Ω
SREF
CURRENT
MIRROR
1:1
VPOS
6
VSET
NC
If a linear voltage output is preferred at IOUT, a single external
resistor to ground is all that is necessary to perform the
2
7
conversion.
1
INPT
IOUT
8
LINEAR
VOLTAGE
PIN
TIA
I PD
DATA PATH
I PD
OUTPUT
Figure 21. Average Power Monitoring Using the ADL5315
VOLTAGE
REFERENCE
ADL5315
CURRENT
LIMITING
R LIM = 48V
I LIM
R LIM
V POS
– 3k Ω
4
COMM
RLIM
5
I LIM = 1mA – 16mA
20k Ω
CURRENT
MIRROR
3
SREF
VSET
1:1
VPOS
NC
6
THIS CONNECTION IS NOT NECESSARY,
BUT REDUCES ERRORS DUE TO LEAKAGE
CURRENTS AT LOW SIGNAL LEVELS.
NODE VOLTAGES
2
7
V SREF = V POS – 1V
V SET = V INPT
1
INPT
IOUT
8
VSUM
OPTICAL
POWER
PIN
I PD
I PD
INPT
TIA
DATA PATH
TRANSLINEAR LOG AMP
AD8304, AD8305, ETC.
Figure 22. Typical Application Using the ADL5315
Rev. 0 | Page 11 of 20
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