RF2461 Ver la hoja de datos (PDF) - RF Micro Devices

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Lista de partido

RF2461

CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHZ DOWNCONVERTER

RF Micro Devices 

Preliminary

RF2461

Pin Function Description

Interface Schematic

15

IF2+

First differential output pin for the second mixer. Open collector. A cur-

rent combiner external network performs a differential to single-ended

conversion and sets the output impedance. A DC blocking cap must be

present if the IF filter input has a DC path to ground. Mixer (IF2+ and

IF2-) needs to “see” a differential impedance between 2kΩ to 4kΩ.

IF2-

IF2+

16

VCC2

VCC pin for the LO buffer/bias circuitry.*

17

LO IN

LO limiter input pin.

LO IN

18

ENABLE This pin is used to enable or disable the RF2461. A logic high (>2.0V)

enables the circuitry. A logic low (<1.0V) disables the circuitry.

ENABLE

19

IP SET

Controls the setting of the LNA current. A logic low (<1.0V) selects the

internal resistance (49.5kΩ), resulting in an LNA current of 5mA. A

IP SET

logic high (>2.0V) selects the external resistance at pin 8.

8

20

IF SEL

Determines which IF port is active. A logic low (<1.0V) activates IF1

and deactivates IF2. A logic high (>2.0V) activates IF2 and deactivates

IF1.

IF SEL

Pkg

Base

GND

Ground connection. The backside of the package should be soldered to

a top side ground pad which is connected to the ground plane with mul-

tiple vias.

*The bias circuitry current drop when LO signal is not present. Total LO buffer/bias circuitry current is 7mA when LO sig-

nal is present.

Rev A13 010607

8-127

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