µPC8172TB
PIN EXPLANATION
Pin
Pin
No. Name
1 IFinput
Applied
Voltage
(V)
−
2 GND
GND
3 LOinput
−
5
VCC
2.7 to 3.3
6 RFoutput Same
bias as
VCC
through
external
inductor
4 PS
VCC/GND
Pin
Voltage
(V)Note
Function and Explanation
1.4
This pin is IF input to double bal-
anced mixer (DBM). The input is
designed as high impedance.
The circuit contributes to sup-
press spurious signal. Also this
symmetrical circuit can keep
specified performance insensitive
to process-condition distribution.
For above reason, double bal-
anced mixer is adopted.
−
GND pin. Ground pattern on the 3
board should be formed as wide
as possible. Track Length should
be kept as short as possible to
minimize ground impedance.
2.3
Local input pin. Recommendable
input level is −10 to 0 dBm.
−
Supply voltage pin.
−
This pin is RF output from DBM.
This pin is designed as open
collector. Due to the high imped-
ance output, this pin should be
externally equipped with LC
matching circuit to next stage.
−
Power save control pin. Bias
controls operation as follows.
Pin bias
VCC
GND
Control
Operation
Power Save
Equivalent Circuit
5
6
1
2
VCC
5
GND
4
2
Note Each pin voltage is measured with VCC = VPS = VRFout = 3.0 V.
4
Preliminary Data Sheet P14729EJ1V0DS00