Preliminary
6-41
RF2643
Rev A1 010717
6
Pin
Function
Description
Interface Schematic
13
VGC
Analog gain control for the driver amplifier. Valid control voltage ranges
from 0.8VDC to 1.9VDC.
14
CELL OUT
Cellular RF output pin. External matching is required. External match-
ing is required. This pin is internally DC biased and should be DC
blocked if it is connected to a device with a DC level present.
15
CELL
ATT GND
Cell attenuator ground pin. This pin should be AC ground. The trace
length between the pin and the bypass capacitors should be minimized.
The value of the capacitor is chosen to resonate in the PCS band.
16
CELL IN
Singled end input for the cellular driver and attenuator. External match-
ing is required. This pin is internally DC biased and should be DC
blocked if it is connected to a device with a DC level present.
17
CELL GND
This pin should be choke to ground. The inductor is used to adjust the
linearity of the cellular driver.
18
CELL VCC
Supply voltage pin for the cell driver. This pin is an open collector and it
will need a bias choke inductor and RF bypass. A parallel resistor to the
inductor improves stability of the driver amplifier.
19
SEL
Band select control pin for the drivers. When Logic "high" (greater than
2.1V) the PCS band is active. When logic "low" (less than 0.5V) the
Cellular Band is active.
20
CELL
MIXOUT
RF mixer output pin for the PCS system. PCS Mixout output imped-
ance depends on the LC match and it is influenced by the bypass
capacitor at VCC2.
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. Addi-
tional ground connections are offered at each corner of the package for
flexibility in layout design.
VGC
CELL ATT-GND
Cell
Attenuator
CELL OUT
CELL VCC
CELL GND
SEL
VCC MIX
CELL MIXOUT
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