Preliminary
8-94
RF2475
Rev A2 010918
8
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 1900 MHz 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.
Pin
Function
Description
Interface Schematic
1LNA VCC19 PCS LNA supply voltage. Local bypass capacitor required.
2GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
3LNA IN19
PCS LNA input. AC-coupled. Requires external 50
Ω matching compo-
nents.
4GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
5LNA IN8
Cellular LNA input. AC-coupled. Requires external 50
Ω matching com-
ponents.
6GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
7
GAIN SEL
Gain select control input. Logic high=high gain, logic low= low gain.
8
LNA VCC8
Cellular LNA RF supply voltage. Local bypass capacitor required.
9LNA OUT
Cellular LNA output. AC-coupled. Requires matching to 50
Ω.
10
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
11
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
12
MXR VCC19 PCS mixer and RX LO doubler enable supply voltage. Local bypass
capacitor required.
13
MXR IN8
Cellular RF mixer input. AC-coupled. Requires matching to 50
Ω.
14
TX LO19
PCS Transmit LO buffer output. Requires matching to 50
Ω.
15
VCC TX19
PCS TX LO buffer and TX LO doubler enable supply voltage. Local
bypass capacitor required.
16
VCC
DOUBLER
Doubler output supply voltage for PCS RX and PCS TX modes. See
Note 1.
17
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
18
IF B
Mixer IF B output. Open collector output, requires external matching
components and DC connection to VCC.
19
IF A
Mixer IF A output. Open collector output, requires external matching
components and DC connection to VCC.
20
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
21
LO IN8
Mixer LO input. AC-coupled. Requires matching to 50
Ω.
22
VCC TX8
Cellular TX LO buffer supply voltage. Local bypass capacitor required.
23
TX LO8
Cellular TX LO buffer output. AC-coupled. Requires matching to 50
Ω.
24
MXR IN19
PCS RF mixer input. AC-coupled. Requires matching to 50
Ω.
25
MXR VCC8
Cellular mixer supply voltage. Local bypass capacitor required.
26
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
27
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
28
LNA OUT19 PCS LNA output. AC-coupled. Requires matching to 50Ω.
Pkg
Base
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.
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