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RF2658PCBA

TRANSMIT MODULATOR, IF AGC, AND UPCONVERTER

RF Micro Devices 

RF2658

Pin

23

24

Function

GND2

MOD OUT-

Description

Interface Schematic

Same as pin 16.

One half of the balanced AGC output port. The impedance of this port

is 200Ω balanced. If no filtering is required, this pin can be connected

to the MIX IN- pin through a DC blocking capacitor. This pin requires an

inductor to VCC to achieve full dynamic range. In order to maximize

gain, this inductor should be a high-Q type and should be parallel reso-

nated out with a capacitor (see application schematic). This pin is NOT

DC blocked. A blocking capacitor of 2200pF is needed when this pin is

connected to a DC path. An appropriate matching network may be

needed if an IF filter is used.

VCC3

VCC3

100 Ω

100 Ω

MOD OUT-

MOD OUT+

25 MOD OUT+ Same as pin 24, except complementary output.

See pin 24.

26

DEC

AGC decoupling pin. An external bypass capacitor of 10nF capacitor is

required. 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.

5

27

GC

Analog gain control for AGC amplifiers. Valid control voltage ranges are

from 0.5VDC to 2.5VDC. The gain range for the AGC is 88dB. These

voltages are valid ONLY for a 37kΩ source impedance.

BIAS

21 kΩ

GC

40 kΩ

28

VCC2

Supply for the modulator stage only. A 10nF external bypass capacitor

is required and an additional 0.1µF will be required if no other low fre-

quency 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. The

part is designed to work from 2.7V to 3.3V supply.

Rev A8 010720

5-65

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