FOA2322A Datasheet, PDF (16/37 Pages) Infineon Technologies AG – 3.2 Gbi t /s Laser Driver IC for Telecom and Datacom Applications

FOA2322A
Electrical Characteristics
Table 3
Characteristics and Operating Conditions (cont’d)
SP Parameter
Sym-
bol
min.
Limit Values
typ.
max.
Unit Condi-
tion
74 Pilot current amplitude on ab_PILOT –
bias current (default)
5.05
–
%
26)
75 Cutoff frequency of
f_MOD
modulation controller with
external C_MOD
(306 kΩ × (204 kΩ × (131 kΩ ×
C_MOD)^-1
C_MOD)^-1
C_MOD)^-1
15)17)
1) _{Measured into 25 Ω.}
2) _{The bias-, modulation-, the LF-, HWA- and MPOUT- output currents are not included.}
3) _{The typical supply current is defined for driving a laser with about 20 mA bias current and about 20 mA}
modulation current and a IC junction temperature of about 50 °C and a V_CC of 5 V. The maximum supply
current is defined for driving the upper limits of bias current and modulation current with worst case junction
temperature and with a V_CC of 5.5 V (V_CC = V_CCA = V_CCD).
4) _{This describes the AC modulation current (the DC component is the overall offset current). AC modulation}
current is drawn by O at V_D > V_DN, it is drawn by ON at V_D < V_DN. I_OH refers to drawn modulation current
(AC + DC). I_OL refers to an inactive current output (DC current only).
5) _{See Table 2 for operating conditions junction temperature.}
6) _{Inactive current output (see also} 4)_).
7) _{Modulation current when the laser diode is disabled.}
8) _{Valid for VCC = VCCA = VCCD = 5 V. It is possible to increase the output voltage range for the VCC range of}
5 V ± 0.5 V of about 0.85 V by using the Pad V_CCD2 instead of V_CCD (see Figure 14). The specified limits for
data and clock inputs are valid for V_CCD.
9) _{Adjustment of programmable parameter by resistor value within this range (see Chapter 2.4).}
10) _{Adjusting the modulation current by RMOD notice that the decreasing of RMOD will increase the modulation}
current. R_MOD in combination with R_TC has to be adjusted that the modulation current is smaller than 50 mA
or 75 mA respectively over specified temperature range. If R_MOD-Pad is not connected (open input) there will
be no modulation current at the output O/ON.
11) _{Modulation current adaptation within junction temperature range. Low junction temperature represents a low}
additional modulation current. High junction temperature represents a high additional modulation current. If
R_TC-Pad is not connected there will be no noteworthy modulation current adaptation.
12) _{Data/clock inputs are internally connected to VBBD/VBBC by resistor R1/R2 with a differential termination by RIN.}
See data input stage description (see Figure 9).
13) _{The resistance is guaranteed for junction temperature 25 °C.}
Preliminary Data Sheet
12
2001-05