RF2484 datasheet(5/12 Pages) RFMD

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RF2484

Rev A7 DS061115

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Function

Description

Interface Schematic

1GND

Ground connection. This pin should be connected directly to the ground

plane.

2GND

Same as pin 1.

3GND

Same as pin 1.

4LO

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-

cies is generally not required.

5GND

Same as pin 1.

6VCC

Power supply. An external capacitor is needed if no other low frequency

bypass capacitor is nearby.

7PD

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),

all circuits are operating normally. If PD is below VCC, output power and

performance will be degraded. Operating in this region is not recom-

mended, although it might be useful in some applications where power

control is required.

8RF 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.

9GND

Same as pin 1.

VCC

Same as pin 6.

GND

Same as pin 1.

GND

Same as pin 1.

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 undes-

ired internal DC offsets; for optimum sideband suppression, phase and sig-

nal 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.

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.

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.

20 0

V CC

RF OUT

10 0

1 p

V CC

10 0

1 p

V CC

10 0

1 p

V CC

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