U4065B Datasheet, PDF (5/34 Pages) TEMIC Semiconductors – FM Receiver

LOBUFF
GND1
Figure 3. Buffered Local Oscillator Output
+
23
50
1
ESD
1V
U4065B
The buffered local oscillator used for output, drives the FM input of the PLL circuit (for
example, U428xBM family). The typical parallel output resistance at 100 MHz is 70 Ω,
the parallel output capacitance is about 10 pF. When using an external load of 500 Ω/10
pF, the oscillator swing is about 100 mV. The second harmonic of the oscillator fre-
quency is less than -15 dBc.
Figure 4. Ground of the Second IF Amplifier
IF2OUT
4807A–AUDR–05/04
8
2
ESD
There is no internal connection to the other ground pins.
Figure 5. Output of the Second IF Amplifier
3
ESD
V_S
V_REF
The parallel output capacitance to ground is about 7 pF. The external load resistance
must be connected to V_S. The DC current into the pin is typically 3 mA.
Note: The supply voltage V_S has to be protected against IF distortion.
5