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參數資料
| 型號： | MC44BC374T1D |
| 廠商： | MOTOROLA INC |
| 元件分類： | 消費家電 |
| 英文描述： | PLL Tuned PAL/NTSC UHF and VHF Audio/ Video High Integration Modulator IC |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| 封裝： | SO-16 |
| 文件頁數： | 14/24頁 |
| 文件大小： | 635K |
| 代理商： | MC44BC374T1D |
14
MC44BC373/374 Technical Data
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Modulator Operation
12 Modulator Operation
12.1 Power-ON Settings
At power-ON, the MC44BC373 and MC44BC374 configuration is as follows:
The settings indicated can be customized in the special masked version.
12.2 Power Supply
The five device Vcc pins (13, 15, 16, 21, 23) 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 the device. The printed
circuit board layout of the Vcc supplies must be designed to ensure maximum isolation of the I/P to O/P
and also between the two O/Ps.
12.3 Standby Mode
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 I
2
C bus and booster sections remain active.
The modulator can be programmed in standby mode using a combination of three bits:
1. OSC=1
2. SO=1
3. ATT=1
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:
1. N0 to N11 are set to have the UHF oscillator on channel 36 (591.25MHz).
Note:
2. Peak White Clip is ON.
Note:
3. Sound frequency is 5
.
5MHz.
Note:
4. Sound auxiliary input is disabled.
Note:
5. Logic Output Port is low voltage.
Note:
6. Picture-to-sound ratio is 12dB.
N5
N4
N3
N2
N1
N0
0
0
ACK
F
Freescale Semiconductor, Inc.
n
.
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