RF2484(2006) データシートの表示（PDF） - RF Micro Devices
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RF2484 Datasheet PDF : 12 Pages
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RF2484
Pin Function Description
Interface Schematic
1
GND
Ground connection. This pin should be connected directly to the ground
plane.
2
GND
Same as pin 1.
3
GND
Same as pin 1.
4
LO
The input of the phase shifting network. This pin has an internal DC block-
ing capacitor. This port is voltage-driven so matching at different frequen-
LO
cies is generally not required.
5
GND
Same as pin 1.
6
VCC
Power supply. An external capacitor is needed if no other low frequency
bypass capacitor is nearby.
7
PD
Power Down control. When this pin is "low," all circuits are shut off. A "low"
is typically 1.2V or less at room temperature.When this pin is "high" (VCC),
VCC
all circuits are operating normally. If PD is below VCC, output power and
performance will be degraded. Operating in this region is not recom-
2 0 0
PD
mended, although it might be useful in some applications where power
control is required.
8
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. A small
amount of DC current may be present at this output. As a result, if the volt-
age at this pin is measured using a high impedance probe, some DC volt-
age may be observed at this output.
RF OUT
9
GND
Same as pin 1.
10
VCC
Same as pin 6.
11
GND
Same as pin 1.
12
GND
Same as pin 1.
13
Q SIG
Baseband input to the Q mixer. This pin is DC coupled. The input drive level
determines output power and linearity performance; for better carrier sup-
pression, 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 4.1V.
For optimum carrier suppression, the DC voltages on I REF, Q REF, I SIG
and Q SIG should be adjusted slightly to compensate for inherent unde-
sired internal DC offsets; for optimum sideband suppression, phase and
signal amplitude on IREF, Q REF, I SIG and Q SIG should be adjusted
slightly to compensate for inherent undesired internal offsets. See RFMD
AN0001 for more detail.
14
I 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 sup-
pression, 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 4.1V; see pin 13 for more information.
15
I 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 4.1V is recommended;
see pin 13 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. This will increase the gain.
1 0 0
1p
V CC
1 0 0
1p
V CC
1 0 0
1p
V CC
DS121024
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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