U4256BM

Preliminary Information

Rev. A2, 03-Nov-98

9 (14)

FMOSCIN

FMOSCIN is the preamplifier input for the FM/AM oscillator signal.

14860

FMOSCIN

AMOSCIN

Figure 6.

MX2LO

MX2LO is the buffered output of the crystal oscillator.

V5

V5

OSCIN

MX2LO

14861

Figure 7.

DAC 1, 2 and 3

DAC 1 to 3 are the outputs for automatic tuner alignment.

VS

14862

DAC1

Figure 8.

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’.

14863

EN

DATA

CLK

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.

14864

SWO1

SWO2

SWO3

SWO4

Figure 10.