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RF2413PCBA

GAIN CONTROLLED DUAL-CONVERSION QUADRATURE MODULATOR

RF Micro Devices 

RF2413

Pin Function Description

Interface Schematic

1

VDD2

Supply Voltage for the RF Output Stage only. A 33pF external bypass

capacitor is required and an optional 0.1µF will be required if no other

low frequency bypass capacitors are nearby. The trace length between

the pin and the bypass capacitors should be minimized. The ground

side of the bypass capacitors should connect immediately to ground

plane.

Though the part is designed to run from a 5V supply, it will work at 3V.

Gain and available output power will be reduced by 5 to 10dB. This also

means that the part is sensitive to unintended power supply variation.

Power supply voltage should be kept constant, or another way of main-

taining constant output power is required.

2

VDD1

Supply Voltage for all circuits except the RF Output Stage. The same

comments as for VDD2 apply to this pin.

3

5

PD

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

when this pin is VDD all circuits are operating. This is a high impedance

input, internally connected to the gates of a few FETs. To minimize cur-

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

0V as possible. Turn-on voltage of some parts of the circuit may be as

low as 0.1V. In order to maximize output power this pin should be as

close to VDD as possible during normal operation.

VDD1

VDD2

PD

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 VDD2/2. Input imped-

ance of this pin is about 3kΩ.

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 25dB it may be tuned ±0.15V (relative to the I SIG

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

impedance of this pin is about 3kΩ.

6

7

8

9

5-22

Q REF

Q SIG

GC1

GC2

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-

sion of better than 25dB it may be tuned ±0.15V (relative to the Q SIG

DC voltage). Without tuning, the carrier suppression will typically be

better than 25dB. The input impedance of this pin is about 3 kΩ.

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-

tude of 5V. The DC level supplied to this pin should be VDD2/2. Input

impedance of this pin is about 3kΩ.

Gain control of the IF input amplifier. This pin, when used as the only

gain control, will give a 30dB control range. When used together with

GC2, a 60dB range is available. When this pin is at 1.8V or lower, the

gain is set to the minimum; when this pin is at 3.8V or above, the gain is

set to the maximum; see the plot below for typical characteristics. If

fixed maximum output level is required, it is recommended to connect

this pin to VDD. There are no provisions in the chip for limiting the

bandwidth of the gain control, so very fast response times are avail-

able. If a slower response is desired, an external capacitor can be

added.

Gain control for the RF output amplifier. This pin has the same control

characteristics as GC1.

Same as pin 5.

Same as pin 4.

GCx

Same as pin 8.

Rev B3 990419

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