Preliminary
RF2494
Pin
13
Function Description
Interface Schematic
See pin 14.
RF signal output for external 50Ω filtering.The use of a filter here is
optional but does provide for lower noise floor and better out-of-band
rejection.
LNA OUT
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 50Ω at the desired operating frequency.
14
VCC4
Microstrip
EXTERNAL
DECOUPLING
VCC4
-16 dB
P15
LNA OUT
P2
LNA IN
BIAS
P1
GAIN SEL
LNA gain control. When GAIN SEL is >V - 300mV, LNA gain is at 10 See pin 14.
dB. When GAIN SEL is <300mV, the LNA gain is -6dB.
15
16
GS
CC
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.
LNA IN
8
8-56
Rev A0 010730
RFMD [ RF MICRO DEVICES ]
