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RF2483
Rev A8 DS060203
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Pin
Function
Description
Interface Schematic
7LOLB
Local oscillator input low band.
This input is biased internally at around 1.6V when the chip is in low band
mode and 0V when the chip is in high band mode or powered down. The
LO signal typically needs to be AC coupled.
The noise performance, carrier suppression at low output powers and side-
band suppression are all a function of LO power.
The optimum LO power is between 0dBm and 3dBm.
The device will work with LO powers as low as -20dBm however this is at
the expense of higher noise performance at high output powers and poorer
sideband suppression.
8GND LO
Ground return for the local oscillator input signals.
The GND LO pin is effectively the complementary LO input for both the high
band and low band LO signals. It has significant amounts of LO signal flow-
ing through it. This pin is brought out as an independent ground to enable
the PCB board designer to isolate the LO return from the RF outputs
ground and the general chip ground.
It is recommended that this ground is kept isolated from the die flag
ground. Any connections between the GND LO and any other ground
should be made through a ground plane.
See pins 7 and 9.
9LOHB
Local oscillator input high band.
This input is biased internally at around 1.6V when the chip is in high band
mode and 0V when the chip is in low band mode or powered down. The LO
HB signal typically needs to be AC coupled.
The noise performance, carrier suppression at low output powers and side-
band suppression are all a function of LO power.
The optimum LO power is between 0dBm and 3dBm.
The device will work with LO powers as low as -20dBm however this is at
the expense of higher noise performance at high output powers and poorer
sideband suppression.
10
GND1
Ground for LO buffers.
See pin 6.
11
BAND SEL
Band select input to define active mode.
CMOS input.
Logic 1 (1.4V to VCC)=High band mode.
Logic 2 (0V to 0.5V)=Low band mode.
12
QSIG N
Quadrature channel negative baseband input port. See QSIGP.
LO L B
GN DL O
LO H B
GND L O
V CC 2
V CC2
12 pF
50
Ω
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