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参数资料
| 型号： | MC44CC375AVEFEVK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | CCEVK NEJA EVAL KIT |
| 标准包装： | 1 |
| 类型： | 调制器 |
| 适用于相关产品： | MC44CC375AV |
| 其它名称： | Q4151738 T0704786 |
VIDEO SECTION
The modulator requires a composite video input with neg-
ative going sync pulses and a nominal level of 1.0 V (pp) . This
signal is AC coupled to the video input where the sync tip lev-
el is clamped.
The video modulation depth typical value is given for
1.0 V CBVS input level. It can be reduced by simply adding a
resistive divider at video input, resulting in a lower signal seen
by the video input stage.
The video signal is then passed to a peak white clip circuit
whose function is to soft clip the top of the video waveform if
the amplitude from the sync tip to peak white goes too high.
In this way, over-modulation of the carrier by the video is
avoided. The clipping function is always engaged.
The clipping happens at 106IRE with 1.0 V pp video signal
(100IRE = 0.7 V pp video blank to white).
SOUND SECTION
The PLL multivibrator oscillator is fully integrated.
The sound modulator system consists of an FM modulator
emphasis circuit, it is possible to extend the audio bandwidth
to high frequencies, as there is no internal frequency limita-
tion (stereo application, SAP, etc.).
PLL SECTION — DIVIDERS
The reference divider is a fixed ÷ 128 resulting in a refer-
ence frequency of 31.25 KHz with a 4.0 MHz crystal. The
31.25 KHz reference frequency is used for both the UHF and
Sound PLLs.
The prescaler is a fixed ÷ 8 and is permanently engaged.
The VHF divider is also a fixed ÷ 8.
The programmable divider ’s division ratio is controlled by
the CHS pin voltage in order to select channel 3 or channel 4.
PIN SELECTION
Pins CHS and PSAVE are internally pulled up to 3.3 V,
SOC is internally pulled up by 1.8 V. By default (open condi-
tion), all pins are “HI”.
Table 2. Configuration Pin Settings
incorporating the sound subcarrier oscillator. The audio input
signal is AC coupled into the amplifier which then drives the
modulator.
The audio pre-emphasis circuit is a high-pass filter with an
external capacitor C1 and an internal resistor (100 k ? typi-
cal). The recommended capacitor value (750 pF) is for NTSC
Pin No
1
3
16
Pin Name
CHS
SOC
PSAVE
LO (grounded)
CH3 - 61.25 MHz
Sound ON
Power Save Mode
HI*
CH4 - 67.25 MHz
Sound OFF
Normal Mode
standards, time constant is 75 μ s.
The audio bandwidth specification is for 50 Hz to 15 KHz
*Please do not pull pin 3 to high voltage. For HI condition, leave pin
3 open.
range, with pre-emphasis circuit engaged. Without this pre-
MC44CC375AV
Digital Home
4
Freescale Semiconductor
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相关代理商/技术参数 |
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| MC44CC375AVEFR2 | 功能描述:调节器/解调器 CMOS MOD R3.0 375AV RoHS:否 制造商:Texas Instruments 封装 / 箱体:PVQFN-N24 封装:Reel |
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