Preliminary
RF2368
Pin
1
Function Description
Interface Schematic
BIAS is set to the supply voltage at high gain mode. For bypass mode
see “Application Notes”.
BIAS
BIAS
2
3
GND
IN
DCS1800/PCS1900 RF input pin.
To Bias
VCC1
Circuit
RF IN
4
GND1
LNA1 emittance inductance. Total inductance is comprised of
package+bondwire+L2 on PCB.
4
5
6
7
8
GND1
VCC
Open collector for first stage LNA of DCS1800/PCS1900. It must be
VCC1
GND1
biased to V through a choke or matching inductor.
CC
LNA2 emittance inductance. Total inductance is comprised of
package+bondwire+L4 on PCB.
GND2
OUT
DCS1800 Amplifier Output pin. This pin is an open-collector output. It
RF OUT
must be biased to V through a choke or matching inductor. This pin
CC
is typically matched to 50Ω with a shunt bias/matching inductor and
series blocking/matching capacitor. Refer to application schematics.
GND2
This pin selects high gain.
Select <0.8V, high gain.
Select >1.8V, low gain.
SELECT
SELECT
Rev A0 010503
4-201
RFMD [ RF MICRO DEVICES ]
