MC44BS373CAEFR2 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC44BS373CAEFR2

PLL-Tuned UHF and VHF Audio/Video High-Integration Modulator

Freescale Semiconductor 

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

Pin Name

Description

1 SCL I2C clock

2 SDA I2C data

3 LOP Logical output port controlled by I2C bus

4 XTAL Crystal

5 GND Ground

6 PREEM Pre-emphasis capacitor

7 AUDIO Audio input

8 SPLLFLT Sound PLL loop filter

Pin Name

Description

9 VIDEO Video input

10 VCCA Main analog supply voltage

11 GND Analog ground

12 TVOUT TV output signal

13 TVOVCC TV output stage supply voltage

14 PLLFLT RF PLL loop filter

15 VCCD Digital supply voltage

16 GNDD Digital ground

MC44BS373CA Data Sheet

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