MC44BC374 MOTOROLA [Motorola, Inc], MC44BC374 Datasheet - Page 6

• Manufacturer Part Number: MC44BC374
• Description: PLL Tuned PAL/NTSC UHF and VHF Audio/ Video High Integration Modulator IC
• Manufacturer: MOTOROLA [Motorola, Inc]

I2C Programming
8 I
WRITE MODE: Test Mode 1 and VHF Range
6
Sound
Standby Mode
OSC
SFD1
PS
SO
0
X2
0
0
0
0
1
1
1
1
0
0
1
1
0
1
0
1
2
C Programming
SO ATT
1
Sound oscillator ON (Normal mode)
Sound oscillation disabled (oscillator and PLL
SFD0
X1
0
0
1
1
0
0
1
1
0
1
0
1
1
Picture-to-Sound Ratio (dB)
Modulator standby mode.
X0
Sound Subcarrier Freq (MHz)
0
1
0
1
0
1
0
1
Sound Oscillator
Combination of 3-bits
State
1.a
1.b
1.d
1.e
1.g
1.h
1.c
1.f
12
16
4.5
5.5
6.0
6.5
Normal operation
RF frequency divided for low frequency testing or VHF range: RF/2
RF/4
RF/8
RF/16
DC drive applied to modulators: Non-inverted video at TVOUT
DC drive applied to modulators: Inverted video at TVOUT
Transient output inhibit disabled
During this speed-up test mode, ATT=0 forces sound current source to 1µA, and
ATT=1 forces it to 10µA.
MC44BC374T1 Technical Data
UHF
Video
TPEN
PWC
OSC
ATT
1
0
0
1
0
1
0
1
Normal operation
UHF oscillator disabled (oscillator and PLL
sections bias turned OFF)
Normal operation
Modulator output attenuation (sound and
video modulators sections bias turned OFF.
Peak White Clip ON
Peak White Clip OFF
Test pattern signal OFF (normal operation)
Test pattern signal ON (picture and sound)
Description
Modular Output Attenuation
Test Pattern Signal
Peak White Clip
UHF Oscillator
MOTOROLA