U4256BM-R Datasheet, PDF (4/19 Pages) ATMEL Corporation – Frequency Synthesizer for Radio Tuning

Figure 3. Internal Components at PDO Connection
V_S
V_S
PDO
V_S
PD
FMOSCIN (Pin 19)
FMOSCIN is the preamplifier input for the FM oscillator signal.
Figure 4. Internal Components at FMOSCIN
V₅
FMOSCIN
MX2LO (Pin 15)
MX2LO is the buffered output of the crystal oscillator. This signal can be used as a refer-
ence frequency for U4255BM or T4258.
The oscillator buffer output can be switched by the OSCB Bit as following (Bit 69)
MX2LO AC Voltage
B69
ON
0
OFF
1
Figure 5. Internal Components at MX2LO
V5
V5
OSCIN
MX2LO
4 U4256BM-R
4562C–AUDR–08/04