U4256BM Datasheet, PDF (9/14 Pages) TEMIC Semiconductors – Frequency Synthesizer for Radio Tuning

FMOSCIN
FMOSCIN is the preamplifier input for the FM/AM oscillator signal.
FMOSCIN
AMOSCIN
U4256BM
14860
Figure 6.
MX2LO
MX2LO is the buffered output of the crystal oscillator.
V5
V5
OSCIN
MX2LO
EN, DATA, CLK
All functions can be controlled via a 3-wire bus consisting
of ENABLE, DATA and CLOCK. The bus is designed for
microcontrollers which operate with 3 V supply voltage.
Details of the data transfer protocol are shown in the table
‘Data Transfer’.
V_DD
EN
DATA
CLK
14861
14863
Figure 7.
DAC 1, 2 and 3
DAC 1 to 3 are the outputs for automatic tuner alignment.
VS
Figure 9.
SWO1, 2, 3 and 4
All switching outputs are ‘open drain’ and can be set and
reset by software control. Details are described in the data
transfer protocol.
DAC1
SWO1
SWO2
SWO3
SWO4
14862
Figure 8.
Figure 10.
14864
Rev. A2, 03-Nov-98
9 (14)
Preliminary Information