ODHKGA4185-03
KGA4185
APPLICATION NOTE
1. For stable operation;
To prevent a dependence of “X-Point” on the supply voltage VD1,
Case 1 : VB2 is open
VB2 is biased at about 0.364 x VD1 (1.2V@VD1=3.3V) by the internal circuit.
Control VB1, so that the voltage difference “VB1–VB2” is constant.
Case 2 : VB2 is biased
Bias VB2 at about 1.2V by using the external voltage source independent of VD1.
Control VB1 by using the external voltage source independent of VD1.
2. Power-up/shut-down sequence;
For power-up, supply voltage (VD2) at first, next supply voltage (VD1), then control voltages ( VB1,
(VB2), VC1, VC2 ).
For shut-down, control voltages( VB1, (VB2), VC1, VC2 ) at first, next VD1, then VD2.
Customer does not need to care about the sequence for the control voltages (VB1,(VB2),VC1,VC2).
ASSEMBLY AND ESD CONSIDERATION
This device has air-bridge structures on the die surface. Do not use a vacuum tool to pick-up the device
and do not touch the surface, in order not to damage to the air-bridges.
Please keep temperature below 300degC during assembling process.
This device is recommended to be used in a hermetic environment, because the humidity stress test is not
performed. In a non-hermetic environment, the long term reliability is not guaranteed.
This device can be damaged by ESD. Therefore appropriate precautions must be taken to avoid exposure
to ESD and EOS during handling, assembly and testing of the device.
SAFETY AND HANDLING INFORMATION ON GaAs DEVICES
Arsenic Compound (GaAs Devices)
The product contains arsenic (As) as a compound.
This material is stable for normal use, however, its dust or vapor may be potentially hazardous to the
human body.
Avoid ingestion, fracture, burning or chemical treatment to the product.
• Do not put the product in your mouth.
• Do not burn or destroy the product.
• Do not perform chemical treatment for the product.
Keep laws and ordinances related to the disposal of the products.
10/11
OKI [ OKI ELECTRONIC COMPONETS ]
