GTD-18442 Rev. 5.0
1
Electronic Components
KGL4126F
TYPICAL APPLICATION
Chip
Capacitor
≥ 0.1µF
KGL4126F
MZ Mod.
GND
VB1
X-Point Control
Inverted Data Input
INB
IN
Blocking
Capacitor
Ex. 0.1µF
OUT
Bias-T
50Ω
Data Input
Chip
Capacitor
VB2
≥ 0.1µF
Chip
Capacitor
≥ 0.1µF
APPLICATION NOTE
1. For stable operation;
1-1. To prevent a dependence of “X-Point” on the supply voltage VS,
(1) Use an external voltage source of –3.8V for “VB2”, or
(2) Control the voltage of “VB1”, so that the voltage difference “VB1–VB2” is constant.
1-2. To prevent a dependence of “Output amplitude” on the supply voltage VS,
Control the voltage of “VC1”, so that the voltage difference “VC1–VS” is constant.
2. Power-up/shut-down sequence;
For power-up, supply control voltages (VB1, (VB2), VC1) at first, next VS, then VD.
For shut-down, VD at first, next VS, then control voltages.
Customer does not need to care about the sequence for the control voltages (VB1,(VB2),VC1).
8/9
OKI [ OKI ELECTRONIC COMPONETS ]
