4 of 8
RF2850
Rev A0 DS050616
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
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 information.
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.
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 performance. The rec-
ommended 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-blocking capacitor. At some frequen-
cies, 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-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 performance. The rec-
ommended 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 p F
V CC
2 p F
V CC
RF OUT
2 p F
V CC
2 p F
V CC
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