RF2475
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pkg
Base
Preliminary
Function Description
Interface Schematic
LNA VCC19
PCS LNA supply voltage. Local bypass capacitor required.
Ground connection. Keep traces physically short and connect immedi-
GND
LNA IN19
GND
LNA IN8
GND
GAIN SEL
LNA VCC8
LNA OUT
GND
GND
MXR VCC19
MXR IN8
TX LO19
VCC TX19
VCC
DOUBLER
GND
IF B
IF A
GND
LO IN8
VCC TX8
TX LO8
MXR IN19
MXR VCC8
GND
GND
LNA OUT19
GND
ately to ground plane for best performance.
PCS LNA input. AC-coupled. Requires external 50Ω matching compo-
nents.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Cellular LNA input. AC-coupled. Requires external 50Ω matching com-
ponents.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Gain select control input. Logic high=high gain, logic low=low gain.
Cellular LNA RF supply voltage. Local bypass capacitor required.
Cellular LNA output. AC-coupled. Requires matching to 50Ω.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
PCS mixer and RX LO doubler enable supply voltage. Local bypass
capacitor required.
Cellular RF mixer input. AC-coupled. Requires matching to 50Ω.
PCS Transmit LO buffer output. Requires matching to 50Ω.
PCS TX LO buffer and TX LO doubler enable supply voltage. Local
bypass capacitor required.
Doubler output supply voltage for PCS RX and PCS TX modes. See
Note 1.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Mixer IF B output. Open collector output, requires external matching
components and DC connection to VCC.
Mixer IF A output. Open collector output, requires external matching
components and DC connection to VCC.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Mixer LO input. AC-coupled. Requires matching to 50Ω.
Cellular TX LO buffer supply voltage. Local bypass capacitor required.
Cellular TX LO buffer output. AC-coupled. Requires matching to 50Ω.
PCS RF mixer input. AC-coupled. Requires matching to 50Ω.
Cellular mixer supply voltage. Local bypass capacitor required.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
PCS LNA output. AC-coupled. Requires matching to 50Ω.
Ground connection. The backside of the package should be soldered to
a top side ground pad which is connected to the ground plane with mul-
tiple vias. The pad should have a short thermal path to the ground
plane.
8
FRONT-ENDS
NOTE:
The LO doubler is enabled by either MXR VCC19 (PCS RX mode) or TX LO19 (PCS TX mode). VCC DOUBLER is the
DC current return path for the output of the doubler. This should be connected to the PLL VCC or a supply that is on in
both the TX and RX modes of the 1900MHz band of operation. In the Cellular mode, the doubler is powered down to
save current, even when VCC DOUBLER is energized. Therefore, the VCC DOUBLER pin can be connected to a supply
that is on in all modes, while minimizing the current consumption of the device.
8-94
Rev A2 010918
RFMD [ RF MICRO DEVICES ]
