RF2480(Rev_A3) Ver la hoja de datos (PDF) - RF Micro Devices

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RF2480
(Rev.:Rev_A3)

DIRECT QUADRATURE MODULATOR

RF Micro Devices 

RF2480

Pin

1

Function

I REF

Description

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 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. This will increase the gain.

Interface Schematic

I SIG

100 Ω

I REF

100 Ω

425 Ω

425 Ω

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

undesired 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 off-

sets. See RFMD AN0001 for more detail.

2

Q 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 recom-

Q SIG

5

mended. See pin 1 for more details.

100 Ω

Q REF

100 Ω

425 Ω 425 Ω

3

GND2

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

connected directly to the ground plane.

4

GND2

Same as pin 3.

5

GND2

Same as pin 3.

6

LO

The input of the phase shifting network. This pin has an internal DC

blocking capacitor. This port is voltage driven so matching at different

LO

frequencies is not required.

7

VCC1

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

capacitor is needed if no other low frequency bypass capacitor is

nearby.

8

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

VCC

"high" (VCC), all circuits are operating normally. If PD is below VCC, out-

put power and performance will be degraded. Operating in this region

200 Ω

PD

is not recommended, although it might be useful in some applications

where power control is required.

9

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

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

10

GND3

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

nected 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.

RF OUT

5-32

Rev A3 011019

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