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MC44BC374T1 Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc

Part No. MC44BC374T1
Description  PLL Tuned PAL/NTSC UHF and VHF Audio/Video High Integration Modulator IC
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC44BC374T1 Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc

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MC44BC374T1 Technical Data
Modulator Operation
13 Modulator Operation
13.1 Power ON Settings
At power-ON, the MC44BC374T1 configuration is as follows:
NOTE:
This power-ON configuration is not available when modulator is switched
ON from STBY pin.
13.2 Power Supply
The three device Vccs (pins 10, 13, 15) must be applied at the same time to ensure all internal blocks are
correctly biased. All other pins must not be biased before Vcc is applied to device (except STBY pin
during hardware standby mode).
13.3 Standby modes
During standby mode, the modulator is switched to low power consumption: the sound oscillator, UHF
oscillator, video and sound modulator sections bias are internally turned OFF.
The IIC bus section remains active.
Modulator can be switched in standby mode in 2 cases:
Software standby mode: combination of 3 bits of IIC message:OSC=0, SO=1 and ATT=1
Hardware standby mode: STBY pin is set to LO state
Hardware / Software standby modes
There is an internal logical “OR” function between the hardware and software standby modes:
NOTE:
When
switching
from
STBY=LO
to
STBY=HI,
the
modulator
configuration is not guaranteed. An IIC message has to be sent to program
the modulator.
WRITE MODE
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
C1—High Order Bits
10000000
ACK
C0—Low Order Bits
01001000
ACK
FM—High Order Bits
0
0
N11
N10
N9N8N7N6
ACK
FL—Low Order Bits
N5
N4
N3
N2
N1
N0
0
0
ACK
Note:
N0 to N11 are set to have UHF oscillator on channel 71 ( 871.25MHz).
Note:
Peak White Clip is ON.
Note:
Sound frequency is 5.5MHz.
Note:
Picture to sound ratio is 12dB.
Hardware standby mode
Normal
Normal
Standby
Standby
Software standby mode
Normal
Standby
Normal
Standby
Modulator Mode
Normal
Standby
Standby
Standby
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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