MC44BC374T1 Просмотр технического описания (PDF) - Motorola => Freescale

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производитель

MC44BC374T1

PLL Tuned UHF and VHF Audio/Video High Integration Modulator

Motorola => Freescale 

I2C Programming

8 I2C Programming

Sound

UHF

SFD 1

0

0

1

1

SFD 0

0

1

0

1

Sound Subcarrier Freq (MHz)

4.5

5.5

6.0

6.5

PS

Picture-to-Sound Ratio (dB)

0

12

1

16

SO

Sound Oscillator

0 Sound oscillator ON (Normal mode)

1 Sound oscillation disabled (oscillator and PLL

Standby Mode

OSC SO ATT

Combination of 3-bits

0 1 1 Modulator standby mode.

WRITE MODE: Test Mode 1 and VHF Range

OSC

1

0

UHF Oscillator

Normal operation

UHF oscillator disabled (oscillator and PLL

sections bias turned OFF)

ATT

Modular Output Attenuation

0 Normal operation

1

Modulator output attenuation (sound and

video modulators sections bias turned OFF.

Video

PWC

0

1

Peak White Clip

Peak White Clip ON

Peak White Clip OFF

TPEN

Test Pattern Signal

0 Test pattern signal OFF (normal operation)

1 Test pattern signal ON (picture and sound)

X2

X1

X0 State

Description

0

0

0

1.a Normal operation

0

0

1

1.b RF frequency divided for low frequency testing or VHF range: RF/2

0

1

0

1.c RF/4

0

1

1

1.d RF/8

1

0

0

1.e RF/16

1

0

1

1.f DC drive applied to modulators: Non-inverted video at TVOUT

1

1

0

1.g DC drive applied to modulators: Inverted video at TVOUT

Transient output inhibit disabled

1

1

1

1.h During this speed-up test mode, ATT=0 forces sound current source to 1µA, and

ATT=1 forces it to 10µA.

6

MC44BC374T1 Technical Data

MOTOROLA

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