RF9958PCBA datasheet(6/12 Pages) RFMD

6 / 12 page

5-98

RF9958

Rev B11 010720

Function

Description

Interface Schematic

MIX IN+

Same as pin 21, except complementary input.

See pin 21.

GND2

Same as pin 16.

MOD OUT-

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

is 200

Ω 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.

MOD OUT+

Same as pin 24, except complementary output.

See pin 24.

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.

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 37k

Ω source impedance. A DC voltage

less than or equal to the maximum allowable Vcc may be applied to this

pin when no voltage is applied to the Vcc pins.

VCC2

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

is required and an additional 0.1

µF 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.

100

Ω

100

Ω

MOD OUT-

MOD OUT+

CC3

21 k

Ω

40 k

Ω

BIAS

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