LTC5549
11
5549fa
For more information www.linear.com/LTC5549
pin FuncTions
GND (Pins 1, 3, 4, 6, 10, 12, Exposed Pad Pin 13):
Ground. These pins must be soldered to the RF ground
on the circuit board. The exposed pad metal of the pack
-
age provides both electrical contact to ground and good
thermal contact to the printed circuit board.
IF (Pin 2): Single-Ended Terminal for the IF Port. This pin
is internally connected to the primary side of the IF trans
-
former, which
has low DC resistance to ground. A series
DC blocking capacitor should be used to avoid damage to
the integrated transformer when DC voltage is present. The
IF port is impedance matched from 500MHz to 6GHz, as
long as the LO is driven with a 0 ±6dBm source between
1GHz and 12GHz.
RF (Pin 5): Single-Ended Terminal for the RF Port. This
pin is internally connected to the primary side of the RF
transformer, which has low DC resistance to ground. A
series DC blocking capacitor should be used to avoid
damage to the integrated transformer when DC voltage is
present. The RF port is impedance matched from 2GHz to
14GHz as long as the LO is driven with a 0 ±6dBm source
between 1GHz and 12GHz.
EN (Pin 7): Enable Pin
. When the voltage to this pin is
greater
than 1.2V, the mixer is enabled. When the input
voltage is less than 0.3V, the mixer is disabled. Typical
current drawn is less than 30μA. This pin has an internal
376kΩ pull-down resistor.
X2 (Pin 8): Digital Control Pin for LO Frequency Doubler.
When the voltage to this pin is greater than 1.2V, the LO
frequency doubler is enabled. When the input voltage
is less than 0.3V, the LO frequency doubler is disabled.
Typical current drawn is less than 30μA. This pin has an
internal 376kΩ pull-down resistor.
V
CC
(Pin 9): Power Supply Pin. This pin must be externally
connected to a regulated 3.3V supply, with a bypass capaci-
tor located
close to the pin. Typical current consumption
is 115mA.
LO
(Pin 11): Input for the Local Oscillator (LO). The LO
signal is applied through this pin. A series DC blocking
capacitor should be used. Typical DC voltage at this pin
is 1.6V.
