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參數(shù)資料
| 型號(hào)： | MC44BC374EJBR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 0K |
| 描述： | IC MODULATOR ANT BOOSTER 24TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 調(diào)制器 |
| 應(yīng)用： | 機(jī)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
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 0 V to 5V ).
2. UHF oscillator power-ON from OFF state (i.e., OSC bit is switched from 1 to 0)
WRITE MODE1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ACK
CA-CHIP ADDRESS
11
001010
ACK
C1-High Order Bits
1
——
PS
——
SYSL
ACK
C0-Low Order Bits
———
SFD1
SFD0
1
0
ACK
FM-High Order Bits
0
TPEN
N11
N10
N9
N8
N7
N6
ACK
FL-Low Order Bits
N5
N4
N3
N2
N1
N0
——
ACK
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.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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| 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 |
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