RF2638 Ver la hoja de datos (PDF) - RF Micro Devices

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RF2638

W-CDMA AND CDMA UPCONVERTER/BPSK MODULATOR

RF Micro Devices 

RF2638

Pin Function Description

Interface Schematic

1

IF-

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-

BIAS

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

130 Ω

130 Ω

260 Ω.

IF-

IF+

2

IF+

Same as pin 1, except complementary input.

See pin 1.

3

BYP

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

BYP

4

LO-

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-

BIAS

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

6

input is AC-coupled to ground.

LO-

LO+

5

LO+

Same as pin 4, except complementary input.

See pin 4.

6

GND

Ground connection. For best performance, keep traces physically short

and connect immediately to ground plane.

7

VCC

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.

8

RF OUT RF output pin.

300 Ω

RF OUT

Rev B13 010731

6-27

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