參數(shù)資料
型號(hào)： MC44BC374CDTB
廠商： MOTOROLA INC
元件分類： 消費(fèi)家電
英文描述： PLL Tuned UHF and VHF Audio/Video High Integration Modulator
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO16
封裝： TSSOP-16
文件頁(yè)數(shù)： 17/30頁(yè)
文件大?。?/td> 915K
代理商： MC44BC374CDTB
Modulator Description
MOTOROLA
MC44BC373C/374C Technical Data
For More Information On This Product,
Go to: www.freescale.com
17
13
Modulator Description
13.1
Power ON Settings
At power-ON, the MC44BC373C/4C configuration is as follows:
These settings can be customized in special masked version.
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.
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 programmed in standby mode with combination of 3 bits:OSC=1, SO=1 and ATT=1
13.4
System L or B/G Selection
SYSL bit internally switches the following functions:
SYSL = 0 enables B/G system
— Video modulation polarityNegative
— Video modulation depth80% Typical (See “Video Characteristics” on page 10.)
— Sound modulation typeFM
SYSL = 1 enables L system
— Video modulation polarityPositive
— Video modulation depth90% Typical (See “Video Characteristics” on page 10.)
— Sound modulation typeAM
WRITE MODE
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
C1
—
High Order Bits
1
0
0
0
0
0
0
0
ACK
C0
—
Low Order Bits
0
0
0
0
1
0
0
0
ACK
FM
—
High Order Bits
0
0
N11
N10
N9
N8
N7
N6
ACK
FL
—
Low Order Bits
Note:
N0 to N11 are set to have UHF oscillator on channel 36 (591.25MHz).
Note:
Peak White Clip is ON.
Note:
Sound frequency is 5.5MHz.
Note:
Logic Output Port is low voltage.
Note:
Picture to sound ratio is 12dB.
N5
N4
N3
N2
N1
N0
0
0
ACK
F
Freescale Semiconductor, Inc.
n
.
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