Preliminary
6-40
RF2643
Rev A1 010717
6
Pin
Function
Description
Interface Schematic
1PD
Power Down Control. When Logic “high” (greater than 2.1V) the device
is active and all circuits are operating. When logic “low” (less than 0.5V)
the device is inactive and all circuits are turned off.
2LO
Single-ended LO input pin. This pin is internally DC biased and should
be DC blocked if it is connected to a device with a DC level present.
The single-ended input impedance is 50
Ω.
3BYPASS
Bypass pin for internal bias circuitry. Bypass with 10nF capacitor.
4IF+
Balanced IF input pin. This pin is internally DC biased and should be
DC blocked if connected to a device with a DC level present. The differ-
ential input impedance is 260
Ω. For single ended input operation, one
pin is used as an input and the other IF input is AC coupled to ground.
5IF-
Same as pin 4, except complementary input.
6PCS
MIXOUT
RF mixer output pin for the PCS system. PCS Mixout output imped-
ance depends on the LC match and it is influenced by the bypass
capacitor at VCC2.
7VCC MIX
Supply voltage pin for the mixer. External bypassing is required. The
trace length between the pin and the bypass capacitors should be min-
imized. The ground side of the bypass capacitors should connect
immediately to ground plane.
8VCC
Supply voltage pin for all the control and bias circuitry. A bias choke
inductor and RF bypass capacitor is required.
9PCS VCC
Supply voltage pin for the PCS driver. This pin is an open collector and
it will need a bias choke inductor and RF bypass. A parallel resistor to
the inductor improves stability of the driver amplifier.
10
PCS IN
Single-ended input for the PCS driver and attenuator. External match-
ing is required. This pin is internally DC biased and should be DC
blocked if it is connected to a device with a DC level present.
11
PCS
ATT GND
PCS attenuator ground pin. This pin should be AC ground. The trace
length between the pin and the bypass capacitors should be minimized.
The value of the capacitor is chosen to resonate in the PCS band.
12
PCS OUT
PCS RF output pin. External matching is required. This pin is internally
DC biased and should be DC blocked if it is connected to a device with
a DC level present.
VCC
Bias
LO+
Bias
LO-
IF+
IF-
Bypass
VCC MIX
PCS MIXOUT
PCS VCC
PCS IN
PCS ATT-GND
PCS
Attenuator
PCS OUT
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