RF2411PCBA-L Ver la hoja de datos (PDF) - RF Micro Devices

Número de pieza

componentes Descripción

Fabricante

RF2411PCBA-L

LOW NOISE AMPLIFIER/MIXER

RF Micro Devices 

RF2411

Pin Function Description

Interface Schematic

1

LNA IN

This pin is NOT internally DC-blocked. An external blocking capacitor must

be provided if the pin is connected to a device with a DC path. A value of

100pF is recommended for 900MHz and 22pF for 1800MHz.

LNA IN

2

GND

Ground connection. For best performance, keep traces physically short

and connect immediately to ground plane.

3

GND

Same as pin 2.

4

GND

Same as pin 2.

5

GND

Same as pin 2.

6

IF OUT+ Balanced open collector output of the mixer. External bias needs to be sup-

plied to this pin. This can be done with a resistor to VCC (see application

schematic, “1800MHz, Balanced Resistor Output Matching”), with a balun

(see application schematic, “1800MHz, Output Matching with Balun”) or

when used in a single-ended configuration (see application schematic,

“1800MHz, Single-Ended Resistive Output Matching”). When using a resis-

tor to VCC the resistor value will set the output impedance. Typical values

for this resistor are 200Ω to 1kΩ. A shunt inductor/capacitor resonator to

VCC is needed to maintain proper DC voltage at the mixer. At low resistor

values the resonator may be omitted at the expense of gain, output power

and IP3. To obtain maximum gain and output power a balun as shown in

application schematics “1800MHz, Output Matching with Balun” and

“850MHz, Output Matching with Balun” is recommended. Using both out-

puts and matching them correctly to a single ended load will result in a

6dB gain improvement over the plain single ended configuration.

7

IF OUT-

Same as pin 6 except complementary output.

See pin 6.

8

LO IN

50Ω mixer LO input. This pin has an internal pull-up resistor to VCC and is

not DC-blocked. An external blocking capacitor must be provided if the pin

is connected to a device with a DC path. A value of 100pF is recommended

for 900MHz and 22pF for 1800MHz.

IF OUT+

IF OUT-

LO IN

9

RF IN+

Balanced mixer RF Input port. This pin is NOT internally DC-blocked. An

external blocking capacitor must be provided if the pin is connected to a

RF IN+

device with a DC path. A value of 100pF is recommended for 900MHz and

22pF for 1800MHz. Matching is required; see the applications schemat-

ics. To minimize the noise figure it is recommended to have a bandpass fil-

ter before this input. This will prevent noise at the image frequency from

being converted to the IF.

RF IN-

BIAS

10

RF IN-

Same as pin 9 except complementary input.

See pin 9.

11

VCC2

Supply voltage for the mixer bias circuits.

12

VCC1

Supply Voltage for the LNA only. A 47pF external bypass capacitor is

required and an optional 0.01μF will be required if no other low frequency

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.

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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 A7 DS070816

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