OKI KGL4175 User Manual
1
Electronic Components
September 9, 2002
GTD-18609 Rev. 1.1
KGL4175HW
10.7 Gbps Direct Modulation Driver IC
Preliminary
FEATURES
• Low Power : 0.6 W (excluding modulation current and bias current)
• High Sensitive Input : 0.25 Vpp (differential)
• Modulation Current Control : 20 mApp to 50 mApp
• Bias Current Control : 0 mA to 45 mA
• X-Point Controllability : 40 % to 60 %
FUNCTION DIAGRAM
VD1
INB
IN
50Ω
Crossing
Point
Control
50Ω
150Ω
OUT
BIAS
VB1 VB2 VC1 VC2
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Min Max Unit Note
Supply Voltage VD1 -0.3 4 V
Voltage of Modulation Current Output V(OUT) -0.3 6 V
Voltage of Bias Current Output V(BIAS) -0.3 6 V
X-Point Control Voltage VB1 -1 +2.5 V
X-Point Reference Voltage VB2 -1 +2.5 V
Modulation Current Control Voltage VC1 -1 +1.6 V
Bias Current Control Voltage VC2 -1 +2.6 V
Input Amplitude Vin - 1.6 Vpp AC coupled
Operating Temperature at Package Base Ts -10 100 °C
Storage Temperature Tst -40 125 °C
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GTD-18609 Rev. 1.1
1
Electronic Components
KGL4175HW
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol Min Typ Max Unit Note
Supply Voltage VD1 3.13 3.3 3.47 V
Low Voltage of Modulation Current Output VL(OUT) 1.4 - - V
Low Voltage of Bias Current Output VL(BIAS) 1.9 - - V
X-Point Control Voltage VB1 0.6 1.2 1.8 V
Vin
1)
0.25 - 1.2 Vpp AC coupled
1.2 V
X-Point Reference Voltage VB2
Output Amplitude Control Voltage VC1 0 - 1.2 V
Output Bias Control Voltage VC2 0 - 2.4 V
Single-ended Input Amplitude 0.5 - 1.2 Vpp AC coupled
Differential Input Amplitude
Operating Temperature at Package Base Ts 0 - 85 °C
Input Interface AC coupled (External blocking capacitor is required)
Output Interface DC coupled( Pull up through LD )
1) VB2 can be open or biased by the external circuit.
For VB2 opened, VB2 is biased at about 1.2V ( VD1=3.3V ).
ELECTRICAL CHARACTERISTICS ( TARGET SPECIFICATIONS)
Parameter Symbol Condition Min Typ Max Unit
Maximum Operating Data Rate NRZ 10.7 - - Gbps
Supply Current Id1 - 150 180 mA
Minimum Modulation Current Imod (min) 50 Ω load - 20 25 mApp
Maximum Modulation Current Imod (max) 50 Ω load 45 50 - mApp
Minimum Bias Current Ibias (min) 50 Ω load - 0 0.5 mA
Maximum Bias Current Ibias (max) 50 Ω load 40 45 - mA
X-Point Control Range
X-Point Stability Del (Xp)
Output Rise/Fall Time Tr/Tf
Input Return Loss S11 100kHz–10 GHz - 13 - dB
High XPH 57 60 %
Low XPL
50 Ω load,
NRZ
50 Ω load,
0–85°C
50 Ω load,
20%/80%
-4043%
-10 - 10 %
-2537ps
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