RF2402 데이터 시트보기 (PDF) - RF Micro Devices

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RF2402

UHF QUADRATURE MODULATOR

RF Micro Devices 

RF2402

Pin Function Description

Interface Schematic

1

VDD2

Power supply for the RF Output amplifier. An external RF bypass

capacitor is needed. The trace length between the pin and the bypass

capacitor should be minimized. The ground side of the capacitor should

connect immediately to the ground plane.

2

VDD1

Power supply for all other circuits. An external RF bypass capacitor is

needed.

3

PD

Power Down control. When this pin is 0V all circuits are turned off, and

when +5V all circuits are operating. This is a high impedance input,

internally connected to the gates of a few FETs. To minimize current

consumption in power down mode, this pin should be as close to 0V as

possible. In order to maximize output power this pin should be as close

to +5V as possible during normal operation.

4

I SIG

Baseband input to the I mixer. This pin is DC coupled. Maximum output

power is obtained when the input signal has a peak to peak amplitude I SIG

of 5V. The DC level supplied to this pin should be 2.5±0.5V. 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

5

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.

5

I REF

Reference voltage for the I mixer. This voltage should be the same as

the DC voltage supplied to the I SIG pin. To obtain a carrier suppres-

I REF

sion of better than 40dB it may be tuned ±0.15V (relative to the I SIG

DC voltage). Without tuning, it will typically be better than 25dB.

6

Q REF

Reference voltage for the Q mixer. This voltage should be the same as

the DC voltage supplied to the Q SIG pin. To obtain a carrier suppres- Q REF

sion of better than 40dB it may be tuned ±0.15V (relative to the Q SIG

DC voltage). Without tuning, it will typically be better than 25dB. 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, Q SIG and Q REF also need to be swapped to maintain cor-

rect phase. It is also possible to drive the SIG and REF inputs in a bal-

anced mode. This will increase the gain.

7

Q SIG

Baseband input to the Q mixer. This pin is DC coupled. Maximum out-

put power is obtained when the input signal has a peak to peak ampli- Q SIG

tude of 5V. The DC level supplied to this pin should be 2.5±0.5V.

8

LO IN

The input of the phase shifting network. This high impedance input can

be matched with an external 56Ω termination resistor. This pin is inter- LO IN

nally connected to ground through a 4kΩ resistor. Putting a DC voltage

on this pin is not recommended. However, connecting this pin to

ground, e.g. through a shunt inductor, is allowed.

9

PHASE

Rev B1 010329

This pin adjusts the phase of the I/Q signals. However, the control is

very sensitive and hard to control. Control voltage change for a few

degrees adjustment is in the order of 10mV. Device to device and tem-

perature variation are not characterized. Therefore it is not recom-

mended to use this pin; leave it not connected. Do NOT connect it to

ground. For compensating large errors in the I/Q signals supplied to the

device or in control loops, this pin may prove useful.

PHASE

5-3

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