參數(shù)資料
型號： MC44BS374T1AEFR2
廠商： Freescale Semiconductor
文件頁數(shù)： 14/34頁
文件大?。?/td> 0K
描述： IC AUDIO/VIDEO MODULATOR 16-SOIC
標(biāo)準(zhǔn)包裝： 1
類型： NTSC/PAL 調(diào)制器
應(yīng)用： 音頻/視頻，VCR，機(jī)頂盒
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 剪切帶 (CT)
其它名稱： MC44BS374T1AEFR2CT
Modes of Operation
MC44BS374T1/374T1A Advance Information
16 Modes of Operation
16.1 Power ON Settings
At power-ON, the MC44BS374T1/374T1A is configured as follows:
16.2 Power Supply
The three device Vccs (pins 10, 13 and 15) must be applied at the same time to ensure all internal blocks
are correctly biased. Do not bias any other pin before Vcc is applied to the MC44BS374T1/374T1A.
When all Vccs are switched to 0V, SDA and SCL pins are high impedance.
16.3 Standby modes
During standby mode, the modulator is switched to low power consumption. That is, the sound oscillator,
UHF oscillator, and the video and sound modulator section’s bias are internally turned OFF.
The I2C bus section remains active.
The MC44BS374T1/374T1A can be set to standby mode with a combination of 3 bits: OSC=0, SO=1 and
ATT=1
16.4 Transient Output Inhibit
To minimize the risk of interference to other channels while the UHF PLL is acquiring a lock on the
desired frequency, the Sound and Video modulators are turned OFF during a time out period for each of
the following two cases:
Power-ON from zero (i.e., all Vcc is switched from 0V to 5V).
UHF oscillator power-ON from OFF state (i.e., OSC bit is switched from 1 to 0)
There is a time-out of 263ms until the output is enabled. This lets the UHF PLL settle to its programmed
frequency. During the 263ms time-out, the sound PLL current source is set to 10
A typical to speed up the
locking time. After the 263ms time-out, the current source is switched to 1
A. Use care when selecting
loop filter components, to ensure the loop transient does not exceed this delay.
Table 8. Power ON Settings
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
ACK
C0-Low Order Bits
0
1
0
1
0
ACK
FM-High Order Bits
0
N11
N10
N9
N8
N7
N6
ACK
FL-Low Order Bits
N5
N4
N3
N2
N1
N0
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:
Logic Output Port is low voltage
Note:
Picture to sound ratio is 12dB.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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