8-26
RF2411
Rev A5 010717
8
Pin
Function
Description
Interface Schematic
1LNA 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.
2GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
3GND
Same as pin 2.
4GND
Same as pin 2.
5GND
Same as pin 2.
6IF 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 200
Ω 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
“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.
7IF OUT-
Same as pin 6 except complementary output.
See pin 6.
8LO IN
50
Ω mixer LO input. This pin has an internal pull-up resistor to V
CC 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.
9RF 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 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.
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 0.01
µF 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.
LNA IN
IF OUT+
IF OUT-
LO IN
BIAS
RF IN-
RF IN+
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