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参数资料
| 型号： | MC44BC375UAFC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC MODULATOR AUD/VID VHF 20 QFN |
| 标准包装： | 490 |
| 类型： | 调制器 |
| 应用： | 机顶盒 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 管件 |
Application Specific Products
Freescale Semiconductor
3
MC44BC375U
FUNCTIONAL OVERVIEW
Figure 2 shows a simplified block diagram of the
MC44BS375U and MC33BS375UA devices.
There are two main sections:
1.
A PLL section to synthesize the VHF output channel
frequency for channel 3 or channel 4.
2.
A modulator section which accepts audio and video
inputs and modulates the VHF carrier.
The high frequency BiCMOS technology allows integration
of the VHF tank circuit and certain filtering functions eliminat-
ing the need for a number of external components.
Figure 2. MC44BS375U/UA Simplified Block Diagram
POWER SUPPLY
The two device VCCS (pins 11 and 14) must be applied at
the same time to ensure all internal blocks are correctly bi-
ased. Do NOT bias any other pin before VCC is applied to the
device.
STANDBY MODES
During standby mode, the modulator is switched to low
power consumption. The sound oscillator, UHF oscillator and
VHF dividers, video and sound modulator sections bias are
internally turned OFF.
The modulator is programmed in standby mode when
pin 9, PSave/LO, is set to a “LO” level (see “Pin Selection” on
page 4).
LOGIC OUTPUT PORT
The Logic Output Port is used to control an external switch
(such as an antenna switch or an attenuator). This pin is an
open collector transistor able to sink up to 15 mA at a low volt-
age.
The LOP output is switched between a “HI” and “LO” level
with pin 9, Psave/LO (see “Pin Selection” on page 4).
VCO & PLL
SECTION
8
1
2
31.25 kHz
6
15
10
4
Channel Select
— CHS
Picture-Sound
Select
— PSS
VIDEOIN
SPLLFLT
PREEM
PLLFLT
XTAL
MODULATOR
SECTION
4 MHz
XCO
UHF
OSC.
13
Sound
Modulator
Video
Modulator
LPF
ALC
Sound
Oscillator
and FM
Modulator
Sound
PFD
Audio
Amplifier
Prog.
Divider
7 AUDIOIN
3
LOP
11 VCC
LPF
12
5 GND
31.25 kHz
Clamp
Prog.
Divider
Phase
Comp.
Ref Divider
÷128
75
9
16
Sound Freq
Select
— SFS
14
VHF Divider
÷8
Prescaler
÷8
RFOUT
Power
save Psave/
LOP
RFOVCC
LPF
GND
Peak
White Clip
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC44BC375UAFCR2 | 功能描述:IC MODULATOR AUD/VID VHF 20-QFN RoHS:否 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
| MC44BC375UD | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:PLL Tuned VHF Audio/ Video High Integration Modulator ICs |
| MC44BC375UEF | 功能描述:IC A-VHF MODULATOR 16-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
| MC44BC375UEFR2 | 功能描述:IC A-VHF MODULATOR 16-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
| MC44BC375VAEFR2 | 制造商:Freescale Semiconductor 功能描述: |
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