- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄2094 > MC44BC374EJBR2 (Freescale Semiconductor)IC MODULATOR ANT BOOSTER 24TSSOP PDF資料下載
參數(shù)資料
| 型號： | MC44BC374EJBR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MODULATOR ANT BOOSTER 24TSSOP |
| 標準包裝： | 2,500 |
| 類型： | 調(diào)制器 |
| 應(yīng)用： | 機頂盒 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-TSSOP |
| 包裝： | 帶卷 (TR) |
Modulator Operation
MC44BC373/374 Technical Data
The auxiliary audio input adds a sound subcarrier to the main carrier. The input can be a modulated
NICAM carrier or a second sound subcarrier for a stereo system. Pin 12 is directly connected to the sound
modulator input and the picture-to-sound ratio (P/S Ratio) depends on the auxiliary audio input level. (P/S
ratio is 20 dB for 35mVrms typical.)
12.10 Test Pattern Generator
A simple test pattern is generated on the IC which can be switched in under bus control to permit a TV
receiver to easily tune in to the modulator output. The pattern consists of two white vertical bars on a black
background and a 976Hz audio test signal.
Figure 10. Test Pattern Generator—(Time in Seconds)
12.11 PLL Section
The reference divider is a fixed divide-by-128, resulting in a reference frequency of 31.25KHz with a
4.0MHz crystal. The 31.25KHz reference frequency is used for both UHF and Sound PLLs.
The prescaler is a fixed divide by 8 and is permanently engaged.
The programmable divider’s division ratio is controlled by the state of control bits N0 to N11. The divider
ratio N for a desired frequency F (in MHz ) is provided by the following formulas:
with:
12.12 UHF Oscillator—VHF Range
The UHF oscillator is fully integrated and does not require any external components. For low frequency
testing or VHF range operation (test mode 1, states 1.b to 1.c), the UHF oscillator can be internally divided
by 2, 4, 8, or 16.
10
20
30
40
50
60
0
64
TE1
24
28
44
TIME IN S.
7/10
3/10
TE2
N
F
8
---
128
4
---------
×
=
N
2048
N11
×
1024
N10
×…… 4N2
×
2N1
×
N0
+
+++
=
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC44BC375UAEFR2 | IC A-VHF MODULATOR 16-SOIC |
| MC44BC375UAFCR2 | IC MODULATOR AUD/VID VHF 20-QFN |
| MC74ACT00N | IC GATE NAND QUAD 2INPUT 14-DIP |
| MC74ACT02N | IC GATE NOR QUAD 2INPUT 14-DIP |
| MC74ACT04MG | IC INVERTER HEX TTL 14-SOEIAJ |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC44BC374T1 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PLL Tuned PAL/NTSC UHF and VHF Audio/ Video High Integration Modulator IC |
| MC44BC374T1D | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC44BC375 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PLL Tuned VHF Audio/ Video High Integration Modulator ICs |
| MC44BC375J | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PLL Tuned VHF Audio/ Video High Integration Modulator ICs |
| MC44BC375JD | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PLL Tuned VHF Audio/Video High Integration Modulator ICs |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。