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