RF2461PCBA-41X Ver la hoja de datos (PDF) - RF Micro Devices

Número de pieza

componentes Descripción

Fabricante

RF2461PCBA-41X

CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER

RF Micro Devices 

RF2461

Pin Function Description

Interface Schematic

15

IF2+

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

combiner external network performs a differential to single-ended conver-

sion 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.

19

20

Pkg

Base

IP SET

IF SEL

GND

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 logic

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

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.

Mixers are identical. Either IF output may be used for CDMA or AMPS appli-

cations.

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

top side ground pad which is connected to the ground plane with multiple

vias.

Package Drawing

QFN, 20-PIN, 4x4

0.15 C A

-A-

4.00

2 PLCS

1.00

0.90

0.05 C

0.05

2 PLCS

0.15 C B

3.75

4.00

Dimensions in mm.

0.15 C

2 PLCS

0.15 C

2 PLCS

3.75

NOTES:

1 Shaded lead is Pin 1.

Dimension applies to plated terminal:

2 to be measured between 0.02 mm and

0.25 mm from terminal end.

12°

MAX

-B-

-C-

0.60

0.24 TYP

Note orientation of package.

0.10 M C A B

0.20 2

0.65

0.30

4 PLCS

2.10 SQ.

0.75

0.50

0.50

0.23

0.13

4 PLCS

ENABLE

IP SET

IF SEL

6 of 14

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Rev B6 DS060925

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