Preliminary
RF2475
Pin
1
2
Function Description
Interface Schematic
PCS LNA supply voltage. Local bypass capacitor required.
LNA VCC19
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
PCS LNA input. AC-coupled. Requires external 50Ω matching compo-
nents.
3
4
5
6
LNA IN19
GND
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.
LNA IN8
GND
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.
7
8
9
GAIN SEL
LNA VCC8
LNA OUT
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
10
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
11
12
GND
PCS mixer and RX LO doubler enable supply voltage. Local bypass
capacitor required.
MXR VCC19
Cellular RF mixer input. AC-coupled. Requires matching to 50Ω.
PCS Transmit LO buffer output. Requires matching to 50Ω.
13
14
15
MXR IN8
TX LO19
VCC TX19
PCS TX LO buffer and TX LO doubler enable supply voltage. Local
bypass capacitor required.
8
Doubler output supply voltage for PCS RX and PCS TX modes. See
Note 1.
16
VCC
DOUBLER
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
17
18
19
20
Mixer IF B output. Open collector output, requires external matching
components and DC connection to VCC.
IF B
IF A
GND
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.
21
22
23
24
25
26
LO IN8
VCC TX8
TX LO8
MXR IN19
MXR VCC8
GND
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.
27
GND
PCS LNA output. AC-coupled. Requires matching to 50Ω.
28
Pkg
Base
LNA OUT19
GND
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.
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 ]
