RF2850
Pin
1
2
Function Description
Interface Schematic
Ground connection.
GND
LO
LO input signal. This pin has an internal DC-blocking capacitor. This
port is voltage-driven so matching at different frequencies is generally
not required.
LO
The reference end of local oscillator.
Ground connection.
3
4
5
6
LOREF
GND
VCC
Power supply. An external capacitor is required.
Reference voltage for the I mixer. The DC voltage should be the same
as the DC supplied to I SIG (pin 7). See pin 7 for more information.
I REF
VCC
The SIG and REF inputs are inputs of a differential amplifier. Therefore,
the REF and SIG inputs are interchangeable. If swapping the I SIG and
I REF pins, the Q SIG and Q REF also need to be swapped to maintain
the correct phase. It is also possible to drive the SIG and REF inputs in
a differential mode which will increase gain.
2 pF
Baseband input to the I mixer. This pin is DC-coupled. The input drive
level determines output power and linearity performance. For better
carrier/sideband suppression and dynamic range, the drive level
should be as high as possible to meet the required linearity perfor-
mance. The recommended DC level for this pin is 2.05V.
7
I SIG
VCC
2 pF
Ground connection.
8
9
10
11
12
GND
RFREF
VCC
GND
RF OUT
The reference end of RF input.
Power supply. An external capacitor is required.
Ground connection.
RF Output. This pin has an internal DC-blocking capacitor. At some fre-
quencies, external matching may be needed to optimize output power.
RF OUT
Ground connection.
13
14
GND
Q SIG
Baseband input to the Q mixer. This pin is DC-coupled. The input drive
level determines the output power and linearity performance. For better
carrier/sideband suppression and dynamic range, the drive level
should be as high as possible to meet the required linearity perfor-
mance. The recommended DC level for this pin is 2.05V.
VCC
2 pF
Reference voltage for the Q mixer. See pin 14 for more information.
15
Q REF
VCC
2 pF
Power supply. An external capacitor is required.
Ground connection.
16
Pkg
Base
VCC
GND
5-54
Rev A0 050616
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