MC44BS373CADR2 datasheet(3/52 Pages) FREESCALE

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MC44BS373CA Data Sheet

Pin Descriptions

•I2C bus 3.3-V compatible

•

Lower power consumption in normal and standby modes (–2 mA)

•

Can be powered down without holding down I2C lines

•

TB1 bit no longer available (limited compatibility with MC44355 devices no longer available)

•

New SREF bit to program sound reference frequency (31.25 and 62.5 kHz)

•

Four different I2C addresses selectable by single pin with external resistor (available only in QFN20

package)

•

Direct sound RF modulator (FM and AM sound modulators bypassed) for NICAM or stereo sound

applications (available only in QFN20 package)

•

Switch between two integrated VCOs controlled directly by frequency divider (at 700 MHz)

•

Lower RF second harmonic spurious but higher third harmonic spurious. In applications it is easier

to filter UHF third harmonics spurious than second harmonics, as these frequencies are always out

of the UHF band. Unfortunately, the second harmonic can fall back into the same UHF band (for

instance channel 21 second harmonic). For this reason, it is almost impossible to have a good

rejection of low UHF second harmonic with an external low-pass filter. This is why the design has

been optimized for maximum second harmonic rejection in spite of an increase in the third

harmonic level.

3 Pin Descriptions

This section describes the pins of the MC44BS373CA. First the 16-pin package will be considered, then the

20-pin package.

3.1 SO16 Package Pin Descriptions

The pins of the 16-pin package are listed in Table 1, along with a description of each.

Table 1. SO16 Package Pin Descriptions

Name

Description

Name

Description

1SCL

I2C clock

VIDEO

Video input

2SDA

I2C data

VCCA

Main analog supply voltage

LOP

Logical output port controlled by I2C bus

GND

Analog ground

XTAL

Crystal

TVOUT

TV output signal

GND

Ground

13 TVOVCC TV output stage supply voltage

PREEM

Pre-emphasis capacitor

PLLFLT

RF PLL loop filter

AUDIO

Audio input

VCCD

Digital supply voltage

SPLLFLT Sound PLL loop filter

GNDD

Digital ground

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