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ADN2531ACPZ-WP Datasheet(PDF) 15 Page - Analog Devices

Part No. ADN2531ACPZ-WP
Description  11.3 Gbps, Active Back-Termination, Differential Laser Diode Driver
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADN2531ACPZ-WP Datasheet(HTML) 15 Page - Analog Devices

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ADN2531
Rev. 0 | Page 15 of 20
TYPICAL APPLICATION CIRCUIT
Figure 40 shows a typical application circuit for the ADN2531.
The dc voltages applied to the BSET and MSET pins control the
bias and modulation currents. The bias current can be monitored
as a voltage drop across the 750 Ω resistor connected between
the IBMON pin and GND. The dc voltage applied to the CPA
pin controls the crosspoint in the output eye diagram. By tying
the CPA pin to VCC, the CPA function is disabled. The ALS pin
allows the user to turn the bias and modulation currents on and
off, depending on the logic level applied to the pin. The data
signal source must be connected to the DATAP and DATAN
pins of the ADN2531 using 50 Ω transmission lines. The
modulation current outputs, IMODP and IMODN, must be
connected to the load (TOSA) using 100 Ω differential (50 Ω
single-ended) transmission lines.
Table 6 provides a list of recommended components for the ac
coupling interface between the ADN2531 and the TOSA. The
reference circuit can support up to 11.3 Gbps applications, and
the low frequency cutoff performance is dependent on the dc
blocking capacitance and the transmission line impedance. For
additional applications information and optical eye diagram
performance data, consult the relevant application notes on the
ADN2531 product page at www.analog.com.
Table 6. Recommended Components
Component
Value
Description
APPLICATIONS INFORMATION
R1, R2
110 Ω
0603 size resistor
R3, R4
300 Ω
0603 size resistor
R13, R14
Varies
The resistor value and size are TOSA
load impedance dependent
C3, C4
100 nF
0402 size capacitor,
Phycomp 223878719849
L6, L7
160 nH
0603 size inductor,
Murata LQW18ANR16
L2, L3
0603 size chip ferrite bead, Murata
BLM18HG601
L1, L4, L5, L8
10 μH
0805 size inductor,
Murata LQM21FN100M70L
MSET
ALS
GND
BSET IBMON IBIAS GND
VCC
DATAP
DATAN
VCC
VCC
IMODP
IMODN
VCC
DATAP
DATAN
C1
C2
MSET
BSET
R5
750
ADN2531
Z0 = 50Ω
Z0 = 50Ω
Z0 = 50Ω
Z0 = 50Ω
GND
VCC
GND
VCC
TOSA
C4
C7
20µF
L2
L1
R1
R14
+3.3V
VCC
VCC
VCC
VCC
VCC
TP1
C5
10nF
GND
GND
VCC
C6
10nF
GND
ALS
CPA
CPA
R13
L7
L8
R4
L6
L5
R3
VCC
L3
L4
R2
VCC
Z0 = 50Ω
Z0 = 50Ω
C3
GND
VCC
C8
100nF
Figure 40. Typical ADN2531 Application Circuit


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