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參數資料
| 型號： | MC44002P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 消費家電 |
| 英文描述： | CHROMA 4 VIDEO PROCESSOR |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數： | 10/40頁 |
| 文件大?。?/td> | 491K |
| 代理商： | MC44002P |
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MC44002 MC44007
10
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued)
Parameter
Unit
Max
Typ
Min
Pin
Symbol
RGB OUTPUT STAGES
Low Dark Sample Output Current
Red
Green
Blue
Dark Sample Cathode Current 5.0 to 15
μ
A, DC
DAC Set to Full Scale, See Figure 1
–
17, 18,
19
mA
–
–
–
–
–
–
3.15
3.15
3.15
High Dark Sample Output Current
Red
Green
Blue
Dark Sample Cathode Current 5.0 to 15
μ
A, DC
DAC Set to Zero, See Figure 1
–
17, 18,
19
mA
3.95
3.95
3.95
–
–
–
–
–
–
Blanking Output Current
–
17, 18,
19
6.0
–
–
mA
Maximum Y to RGB Output Transconductance
Gain DAC Set to Full Scale
–
17, 18,
19
6.0
7.0
8.0
mA/V
Brightness
(00)
(63)
Wrt Dark Sample Cathode Voltage,
High Voltage Output Stage Transimpedance
39 k
, Dark Sample Cathode Current 15
μ
A, Dark
Sample Cathode Voltage 140 V
–
–
V
–
–
30
–20
–
–
RGB Dark Sample Current Intensity Range
RGB Intensity DACs Varying from (00) to (63)
–
20
15
20
–
dB
Bright to Dark Sample Current Ratio
–
20
8.0
9.5
11
μ
A/
μ
A
Leakage Loop
Sink Current
Source Current
–
20
μ
A
20
5.0
–
–
–
–
Average Beam Current Detection Level
Excess Flag
Overload Flag
–
9
V
0.9
–1.3
1.0
–1.2
1.1
–1.1
Peak Beam Current Detection Level
–
20
6.5
6.8
7.1
V
Figure 1. Example of Output Circuitry
Vp, Vref, RFDBK and Rp values will determine the exact operating point.
For example, let us take:
Vp = 5.0 V
Vref = 3.6 V
Rp = 6.8 k
RFDBK = 39 k
The formula giving the Dark Cathode Voltage with above circuit is: Vdk = Vref + RFDBK*(Vref – Vp + lodk*Rp) / Rp
With above application, component values and lodk specifications, all 3 cathodes on all devices will always have a range of at least 120 V to 150 V.
By changing the values of Vp, Vref and Rp, the cathode voltage range may be shifted up or down as required.
lodk
Vref
Vdk
Picture Tube
Cathode
RFDBK
RP
VP
Pins 17, 18, 19
MC44002/7P
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