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Preliminary
8-56
RF2494
Rev A0 010730
8
Pin
Function
Description
Interface Schematic
13
LNA OUT
RF signal output for external 50
Ω filtering.The use of a filter here is
optional but does provide for lower noise floor and better out-of-band
rejection.
See pin 14.
14
VCC4
Supply voltage for the LNA. This pin should be bypassed with a 10 pF
capacitor to ground as close to the pin as possible. The shunt induc-
tance from this pin to ground via the supply decoupling must be tuned
to match the LNA output to 50
Ω at the desired operating frequency.
15
GS
LNA gain control. When GAIN SEL is > VCC- 300mV, LNA gain is at 10
dB. When GAIN SEL is <300mV, the LNA gain is -6dB.
See pin 14.
16
LNA IN
This pin is NOT internally DC blocked. An external blocking capacitor
must be provided if the pin is connected to a device with DC present. If
a blocking capacitor is required, a value of 2pF is recommended.
See pin 14.
P2
LNA IN
BIAS
VCC4
P1
GAIN SEL
P15
LNA OUT
EXTERNAL
DECOUPLING
Microstrip
-16 dB
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