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参数资料
| 型号： | MC44BC373 |
| 厂商： | Motorola, Inc. |
| 英文描述： | Multi-Standard or PAL/ NTSC Modulator with integrated antenna booster/splitter ICs |
| 中文描述： | 多制式或PAL / NTSC制式，集成天线的助推器调制器/分路器集成电路 |
| 文件页数： | 15/24页 |
| 文件大小： | 635K |
| 代理商： | MC44BC373 |
Modulator Operation
MOTOROLA
MC44BC373/374
Technical Data
For More Information On This Product,
Go to: www.freescale.com
15
12.4 Test Bit TB1
This test bit allows an initial evaluation of MC44BC373 and MC44BC374 using software developed for
MC443535:
TB1= 0 — All MC44BC373/374 functions available—normal mode.
TB1= 1 — Limited software compatibility with MC44353; MC44BC373/374 functions not
available.
12.5 System L or B/G Selection
SYSL bit internally switches the following functions:
SYSL = 0; enables B/G system
— Video modulation polarity—Negative
— Video modulation depth—80% Typical (See Video Characteristics on page 10.)
— Sound modulation type—FM
SYSL = 1; enables L system
— Video modulation polarity—Positive
— Video modulation depth—90% Typical (See Video Characteristics on page 10.)
— Sound modulation type—AM
12.6 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 for each of the following two cases:
1. Power-ON from zero (i.e., all Vcc is switched from 0V to 5V).
2. UHF oscillator power-ON from OFF state (i.e., OSC bit is switched from 1 to 0)
WRITE MODE
1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
CA-CHIP ADDRESS
1
1
0
0
1
0
1
0
ACK
C1-High Order Bits
1
—
—
PS
—
—
SYSL
ACK
C0-Low Order Bits
—
—
—
SFD1
SFD0
1
0
0
ACK
FM-High Order Bits
0
TPEN
N11
N10
N9
N8
N7
N6
ACK
FL-Low Order Bits
Note:
1. Case TB1=1, compatible with MC44353
Note:
2. All
“—”
are don
’
t care bits.
Note:
3. PS bit replaces PSD2 bit in MC44353 bus format:
PS = 0 is for picture-to-sound ratio = 12dB,
PS = 1 is for picture-to-sound ratio = 16dB
Note:
4. SFD1 and SFD0 bits have the same definition for both bus formats (MC44353 and MC44BC373/374) and
lets a sound frequency between 4
.
5MHz, 5MHz, 5
.
5MHz, and 6
.
5MHz be selected.
Note:
5. SYSL bit has same definition for bus formats MC44353 and MC44BC373/374; either system L or B/G is
selectable.
Note:
6. All MC44BC373/374 functions are set to their default values.
N5
N4
N3
N2
N1
N0
—
—
ACK
F
Freescale Semiconductor, Inc.
n
.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC44BC373C | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PLL Tuned UHF and VHF Audio/Video High Integration Modulator |
| MC44BC373CD | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PLL Tuned UHF and VHF Audio/Video High Integration Modulator |
| MC44BC373CDR2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PLL Tuned UHF and VHF Audio/Video High Integration Modulator |
| MC44BC373CDTB | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PLL Tuned UHF and VHF Audio/Video High Integration Modulator |
| MC44BC373CDTBR2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PLL Tuned UHF and VHF Audio/Video High Integration Modulator |
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