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RF2480

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.

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 3.0V is recommended.

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. This will increase the gain.

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.

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 3.0V is recommended.

See pin 1 for more details.

3GND2

Ground connection of the LO phase shift network. This pin should be con-

nected directly to the ground plane.

4GND2

Same as pin 3.

5GND2

Same as pin 3.

6LO

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 not required.

7VCC1

Power supply for all circuits except the RF output stage. An external capaci-

tor is needed if no other low frequency bypass capacitor is nearby.

8PD

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" (V

all circuits are operating normally. If PD is below V

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.

9RF OUT

RF Output. This pin has an internal DC blocking capacitor. At some frequen-

cies, external matching may be needed to optimize output power.

10

GND3

Ground connection for the RF output stage. This pin should be connected

directly to the ground plane.

11

VCC2

Power supply for the RF output amplifier. An external capacitor is needed if

no other low frequency bypass capacitor is near by.

12

GND1

Ground connection for the LO and baseband amplifiers, and for the mixers.

This pin should be connected directly to the ground plane.

13

GND1

Same as pin 12.

14

GND1

Same as pin 12.

425



425



100



100



I REF

I SIG

425



425



100



100



Q REF

Q SIG

LO

20 0



PD

RF OUT