5-54
RF2850
Rev A0 050616
Pin Function Description Interface Schematic
1GND
Ground connection.
2LO
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.
3LOREF
The reference end of local oscillator.
4GND
Ground connection.
5VCC
Power supply. An external capacitor is required.
6I REF
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 inform ation.
The SIG and REF inputs a re inputs of a diff erential am plifier . Theref ore ,
the REF and SIG inputs are interchangeab le . If s wappin g the I SIG and
I REF pins, the Q SIG and Q REF also need to be s w apped to maintain
the correct phase. It is also possib le to driv e the SIG and REF inputs in
a differential mode which will increase gain.
7I SIG
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.
8GND
Ground connection.
9RFREF
The reference end of RF input.
10 VCC Power supply. An external capacitor is required.
11 GND Ground connection.
12 RF OUT RF Output. This pin has an internal DC-b loc king capacitor. At some fre-
quencies, external matching may be needed to optimize output power.
13 GND Ground connection.
14 Q SIG Baseband input to the Q mixer . This pin is DC-cou pled. The input driv e
lev el determines the output pow er and linearity perf ormance. F or 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.
15 Q REF Reference voltage for the Q mixer. See pin 14 for more information.
16 VCC Power supply. An external capacitor is required.
Pkg
Base GND Ground connection.
LO
2 pF
VCC
2 pF
VCC
RF OUT
2 pF
VCC
2 pF
VCC