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參數(shù)資料
| 型號： | RF9936 |
| 英文描述： | RF Mixer |
| 中文描述： | RF混頻器 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 243K |
| 代理商： | RF9936 |
8-125
RF9936
Rev A8 000822
8
F
NOT FOR NEWDESIGNS
SeeUpgradedProductRF9986
Pin
20
Function
LNA OUT
Description
LNA Output pin. This is an open-collector output. This pin is typically
connected to pin 22 through a bias/matching inductor. This inductor, in
conjunction with a series blocking/matching capacitor, forms a match-
ing network to the 50
image filter and provides bias (see Application
Example). The LNA’s IP3 may be increased 10dB by connecting pin 20
to V
CC
through the inductor. The LNA’s current then increases by
10mA. Other in-between IP3 vs. I
CC
trade-offs may be made by con-
necting resistance values between V
CC
and the matching inductor. The
two reference points for consideration are with 150
used, which is
what connection to pin 22 achieves, the Input IP3 is +2dBm and the
CC
LNA I
CC
is 15 mA. Desired operating points in between these values
may be interpolated, roughly.
Same as pin 17.
Interface Schematic
21
22
GND8
VCC4
Output supply voltage for the LNA Output (pin 20). This pin should NOT
be connected to a voltage supply. This pin should be connected to pin
20 through a bias/matching inductor (see Application Example). Exter-
nal RF bypassing is required. The trace length between the pin and the
bypass capacitor should be minimized. The ground side of the bypass
capacitor should connect immediately to ground plane.
Same as pin 17.
See pin 2.
23
24
GND9
GC
Analog gain adjustment for RF buffer amplifier. Minimum gain is
selected with 2.5V to 3.0V. Maximum gain is selected with 0V to 0.5 V.
When operating the RF9936 at fixed maximum gain, this pin may be
grounded.
LNA
OUT
150
GC
350
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