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參數(shù)資料
| 型號： | MC44817B |
| 廠商： | Motorola, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RW-S Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 09V; Power: 2W; DIP24 Low Profile Miniature Package; 1kVDC Isolation; Feedback Regulated Output; 2:1 Wide Range Voltage Input; Continuous Short Circuit Protection; Less than 7mm Height; SMD Pinning Option; Efficiency to 87% |
| 中文描述： | 電視機和錄像機背燈電路，帶有1.3 GHz的分頻器和3線總線 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 159K |
| 代理商： | MC44817B |
MC44817/17B
7
MOTOROLA ANALOG IC DEVICE DATA
Bit T6: Switches the Prescaler
T6 = 0
T6
= 1
Low Frequency Operation
Preamp. 2 Switched Off, 165 MHz maximum
The prescaler is bypassed and the power supply of
the prescaler is switched off. Input: 10 MHz
minimum, 20 mVrms minimum
Normal Operation, 1.3 GHz
Figure 4. Equivalent Circuit of the Integrated
Band Buffers
“On”/“Off”
ISUB
30 mA (40 mA
at 0 to 80
°
C)
VCC3 12 V
(Min VCC1, Max 14.4 V)
25 V
Protection
IB
Out
B0
…
B3
(1)
NOTE:
IB + ISUB = 8.0 mA Typical, 13 mA Max
IB = Base Current
ISUB = Substrate Current of PNP
The Programmable Divider
The programmable divider is a presettable down counter.
When it has counted to zero it takes its required division ratio
out of the latches B. Latches B are loaded from latches A by
means of signal TDI which is synchronous to the
programmable divider output signal.
Since latches A receive the data asynchronously with the
programmable divider; this double latch scheme is needed to
assure correct data transfer to the counter.
The division ratio definition is given by:
N = 16384 x N14 + 8132 x N13 +
…
+ 4 x N2 + 2 x N1 + N0
Maximum Ratio 32767
(16363 in case of 18 bit bus protocol)
Minimum Ratio 17
N0
…
N14 are the different bits for frequency information.
Gnd
0.15 V Typical
0.3 V Max
At power–on the whole bus receiver is reset and the
programmable divider is set to a counting ratio of N = 256 or
higher.
The Prescaler
The prescaler has a preamplifier which guarantees high
input sensitivity.
The Phase Comparator
The phase comparator is phase and frequency sensitive
and has very low output leakage current in the high
impedance state.
The Operational Amplifier
The operational amplifier is designed for very low noise,
low input bias current and high power supply rejection. The
positive input is biased internally. The operational amplifier
needs 28.5 V supply (VCC2) as minimum voltage for a
guaranteed maximum tuning voltage of 28 V.
Figure 6 shows a possible filter arrangement. The
component values depend very much on the application
(tuner characteristic, reference frequency, etc.).
The Oscillator
The oscillator uses a 3.2 to 4.0 MHz crystal tied to ground in
series with a capacitor. The crystal operates in the series
resonance mode.
The voltage at Pin 3 has low amplitude and low harmonic
distortion.
Figure 5. Equivalent Circuit of the Lock Output
2.0 k
25 V Protection
Lock
VCC1 5.0 V
100 k
200
μ
A Typical
1.0 nF
÷
8
Pres
Figure 6. Typical Tuner Application
11
12
13
10
B3
B2
T6
B1
B0
12 pF
3.2/4.0 MHz
Gnd
9
6
5
4
15
Lock
B III
VHF
UHF
AGC
VTUN
33 V
Phase
Comp
Program
Divider
2.7 V
Mixer
B. P. Filter
Antenna
Filter
Oscillator
IF
7
5.0 V
2
1
16
3
Osc &
Ref Div
8
Fosc
CL
DA
EN
VCC3
14 12 V
Bus
Rec
22 nF
47 k
(Note 1)
(Note 2)
330 p
47 nF
NOTES:
1.On some layouts the 100
resistor will not be required.
2.C2 = 330 pF minimum is required for stability.
External Switching
MC44817/17B
相關PDF資料 |
PDF描述 |
|---|---|
| MC44817BD | TV AND VCR PLL TUNING CIRCUITS WITH 1.3 GHz PRESCALER AND 3-WIRE BUS |
| MC44817D | RW-D Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 12V; Power: 2W; DIP24 Low Profile Package; Dual Ouputs from a Single Supply; 2:1 Wide Range Voltage Input; 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protection; Low profile 7mm Height; Approved for Medical Applications; Efficiency to 85% |
| MC44818D | TV AND VCR PLL TUNING CIRCUIT WITH 1.3 GHz PRESCALER AND I2C BUS |
| MC44818 | TV AND VCR PLL TUNING CIRCUIT WITH 1.3 GHz PRESCALER AND I2C BUS |
| MC44824D | RW-S Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 15V; Power: 2W; DIP24 Low Profile Miniature Package; 1kVDC Isolation; Feedback Regulated Output; 2:1 Wide Range Voltage Input; Continuous Short Circuit Protection; Less than 7mm Height; SMD Pinning Option; Efficiency to 87% |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC44817BD | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PLL Tuning Circuits with 3-Wire Bus |
| MC44817BDR2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC44817D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PLL Tuning Circuits with 3-Wire Bus |
| MC44818 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:TV AND VCR PLL TUNING CIRCUIT WITH 1.3 GHz PRESCALER AND I2C BUS |
| MC44818D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:TV AND VCR PLL TUNING CIRCUIT WITH 1.3 GHz PRESCALER AND I2C BUS |
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