4

U4256BM-R

4562C–AUDR–08/04

Figure 3. Internal Components at PDO Connection

FMOSCIN (Pin 19)

FMOSCIN is the preamplifier input for the FM oscillator signal.

Figure 4. Internal Components at 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)

Figure 5. Internal Components at MX2LO

PD

V

S

V

S

V

S

PDO

FMOSCIN

V

5

MX2LO AC Voltage

B69

ON

0

OFF

1

V5

V5

OSCIN

MX2LO