RF2411(Rev_A5) 查看數據表（PDF） - RF Micro Devices

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RF2411
(Rev.:Rev_A5)

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

supplied to this pin. This can be done with a resistor to VCC (see appli-

cation 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 applica-

tion schematic, “1800MHz, Single-Ended Resistive Output Matching”).

When using a resistor 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 omit-

ted at the expense of gain, output power and IP3. To obtain maximum

gain and output power a balun as shown in application schematics

8

“1800MHz, Output Matching with Balun” and “850MHz, Output Match-

ing with Balun” is recommended. Using both outputs and matching

them correctly to a single ended load will result in a 6dB gain improve-

ment 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 RF IN+

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

900MHz and 22pF for 1800MHz. Matching is required; see the appli-

cations schematics. To minimize the noise figure it is recommended to

have a bandpass filter 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 fre-

quency 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.

8-26

Rev A5 010717

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