5-45
RF2424
Rev A6 010817
5
Pin
Function
Description
Interface Schematic
1I REF
Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied to the I SIG pin. A voltage of 1.6V is recom-
mended. 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 balanced mode. If single ended operation is desired
then the input is applied to I SIG, pin 16. In that case, I REF and Q REF
are tied together and AC coupled to ground. To obtain a carrier sup-
pression of better than 40dB, I REF may be tuned ±20mV relative to
the I SIG. Without tuning, it will typically be better than 25dB.
2Q REF
Reference voltage for the Q mixer. This voltage should be the same as
the DC voltage supplied to the Q SIG pin. A voltage of 1.6V is recom-
mended. The SIG and REF inputs are inputs of a differential amplifier.
Therefore the REF and SIG inputs are interchangeable. If swapping the
Q SIG and Q REF pins, the I SIG and I REF also need to be swapped
to maintain the correct phase. It is also possible to drive the SIG and
REF inputs in a balanced mode. If single ended operation is desired
then the input is applied to Q SIG, pin 15. In that case, Q REF and Q
REF are tied together and AC coupled to ground. To obtain a carrier
suppression of better than 40dB, Q REF may be tuned ±20mV relative
to the Q SIG. Without tuning, it will typically be better than 25dB.
3VCC1
Power supply for the I mixer, Q mixer and the RF Output amplifier.
4
MIX OUT
MIXOUT: Combined output of the I mixer and Q mixer. By changing the
inductor value, maximum RF output is tuned to different frequency. If
the inductor value is changed, the RF output match needs to be
adjusted for 50
Ω output impedance.
5GND1
Ground connection for the LO and baseband amplifiers and mixers.
6GND1
Same as pin 5.
7LO IN
The input of the phase shifting network.
8GND3
Ground connection for the LO phase shift network.
9RF OUT
RF Output. An external LC matching network is needed for a 50
Ω
match.
10
GND2
Ground connection for the RF output stage.
11
GND1
Same as pin 5.
12
PD
Power Down control. When this pin is “low”, all circuits are shut off.
13
VCC2
Power supply for all circuits except mixers and output amplifier.
14
GND1
Same as pin 5.
15
Q SIG
Baseband input to the Q mixer. Maximum output power is obtained
when the input signal has a peak to peak amplitude of 400mV. The DC
level for this pin is 1.6V, same as QREF.
See pin 2.
16
I SIG
Baseband input to the Q mixer. Maximum output power is obtained
when the input signal has a peak to peak amplitude of 400mV. The DC
level for this pin is 1.6V, same as QREF.
See pin 1.
Q REF
QSIG
BIAS
BIAS
Q REF
QSIG
BIAS
BIAS
MIX OUT
LO
BIAS
RFOUT
PD
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