12-40GHz Detector
Notes
CHE1270-QAG
RF IN
CHE1270
Matching
27kΩ
Ω
Vdet
DC
27kΩ
Ω
Vref
Recommended external resistors assembly
27kΩ resistors in parallel with Vdet and Vref pads are recommended to provide the best
behaviour in the whole operating temperature range.
As the voltage detection is the difference between Vref and Vdet, the external resistor value
should be identical on these two ports.
For information, a variation of 3% leads around 1mV variation of detected voltage.
Due to ESD protection circuits on RF input, an external capacitance might be requested to
isolate the product from external voltage that could be present on the RF access.
ESD protections are also implemented on Vdet and Vref accesses.
The DC connection (on DC pad) does not include any decoupling capacitor in package,
therefore it is mandatory to provide a good external DC decoupling on the PC board, as
close as possible to the package.
Ref. : DSCHE1270-QAG8205 - 25 Jun 08
7/8
Specifications subject to change without notice
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UMS [ UNITED MONOLITHIC SEMICONDUCTORS ]
