RF2638PCBA-PCSSLASHCEL datasheet(3/10 Pages) RFMD

3 / 10 page

6-29

RF2638

Rev B15 060921

Function

Description

Interface Schematic

1IF-

Balanced IF input pin. This pin is internally DC-biased and should be

DC-blocked if connected to a device with a DC level present. For single-

ended input operation, one pin is used as an input and the other IF

input is AC-coupled to ground. The balanced, input impedance is

260

Ω.

2IF+

Same as pin 1, except complementary input.

See pin 1.

3BYP

Bypass pin for internal bias circuitry. Bypass with a 1nF capacitor.

4LO-

Balanced LO input pin. This pin is internally DC-biased and should be

DC-blocked if connected to a device with a DC level present. For single-

ended input operation, one pin is used as an input and the other LO

input is AC-coupled to ground.

5LO+

Same as pin 4, except complementary input.

See pin 4.

6GND

Ground connection. For best performance, keep traces physically short

and connect immediately to ground plane.

7VCC

Supply voltage pin. External bypassing is required. External RF, LO,

and IF bypassing 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.

8RF OUT

RF output pin.

IF+

IF-

130

BIAS

BYP

LO+

LO-

BIAS

300

RF OUT

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