Preliminary
4-202
RF2416
Rev A2 010810
4
Pin
Function
Description
Interface Schematic
1HB IN
DCS1800/PCS1900 RF input pin.
2HB BIAS
HB BIAS is set to the supply voltage at high gain mode. For bypass
mode see “Gain Select Possibility”.
3LB BIAS
LB BIAS is set to the supply voltage at high gain mode. For bypass
mode see “Gain Select Possibility”.
4LB IN
GSM900 RF input pin.
5LB GND
LNA emittance inductance. Total inductance is comprised of
package+bondwire+ L2 on PCB.
6LB OUT
GSM900 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 50
Ω with a shunt bias/matching inductor and
series blocking/matching capacitor. Refer to application schematics.
7
LB SELECT This pin selects high gain and bypass for GSM900.
Select < 0.8V, high gain.
Select > 1.8V, low gain.
8
HB SELECT This pin selects high gain and bypass for DCS1800/PCS1900.
Select < 0.8V, high gain.
Select > 1.8V, low gain.
9HB 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 50
Ω with a shunt bias/matching inductor and
series blocking/matching capacitor. Refer to application schematics.
HB IN
VCC1 HB
To Bias
Circuit
HB GND1
HB VREF/P
LB VREF/PD
LBOUT
LB GND
LB IN
To Bias
Circuit
LB SELECT
HB SELECT
HB OUT
HB GND2
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