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參數(shù)資料
| 型號： | MC44BC375UADEVK |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT KIT FOR BC375UA AUD/VID MOD |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | * |
| 適用于相關(guān)產(chǎn)品： | * |
| 所含物品： | * |
Application Specific Products
4
Freescale Semiconductor
MC44BC375U
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 at power-ON
(i.e., VCC is switched from 0 V to 5.0 V or device is switched
from “Standby mode” to “Normal operation”).
There is a time-out of 263 ms until the output is enabled.
This allows the UHF PLL to settle to its programmed frequen-
cy. During the 263 ms time-out, the sound PLL current source
is set to 10
A typical to speed up the locking time. After the
263 ms time-out, the current source is switched to 1.0
A.
Use care when selecting loop filter components to ensure the
loop transient does not exceed this delay.
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 VCBVS input level. It can be adjusted to any lower value
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.
SOUND SECTION
The multivibrator oscillator is fully integrated and does not
require any external components. An internal low pass filter
and matched structure give a very low harmonics level.
The sound modulator system consists of an FM modulator
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 M/N
standards, time constant is 75
s and it is 470 pF for B/G
standards (50
s).
The audio bandwidth specification is for 50 Hz to 15 KHz
range, with pre-emphasis circuit engaged. Without this pre-
emphasis circuit, it is possible to extend the audio bandwidth
to high frequencies, as there is no internal frequency limita-
tion (stereo application).
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, PSS, and SFS are internally pulled up to 5.0 V.
By default (open condition), all pins are “HI”.
Table 2. Configuration Pin Settings
Pin No
Pin Name
LO (grounded)
HI (open or +5.0 V)
1
CHS
CH4
CH3
2
PSS
14 dB
16 dB
9
PSave/
LOP
Power save Mode
LOP pin LO
(Low voltage)
Normal Operation
LOP pin HI
(High impedance)
16
SFS
5.5 MHz
4.5 MHz
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| MC44BC375UAEF | 功能描述:IC A-VHF MODULATOR 16-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| MC44BC375UAEFR2 | 功能描述:IC A-VHF MODULATOR 16-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| MC44BC375UAFC | 功能描述:IC MODULATOR AUD/VID VHF 20 QFN RoHS:否 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| MC44BC375UAFCR2 | 功能描述:IC MODULATOR AUD/VID VHF 20-QFN RoHS:否 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| MC44BC375UD | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PLL Tuned VHF Audio/ Video High Integration Modulator ICs |
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