MC44007P Просмотр технического описания (PDF) - Motorola => Freescale
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MC44007P Datasheet PDF : 40 Pages
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MC44002 MC44007
ELECTRICAL CHARACTERISTICS (continued)
Parameter
Symbol
Pin
Min
Typ
Max
Unit
RGB OUTPUT STAGES
Low Dark Sample Output Current
Red
Green
Blue
Dark Sample Cathode Current 5.0 to 15 µA, DC
DAC Set to Full Scale, See Figure 1
–
17, 18,
19
–
–
–
mA
–
3.15
–
3.15
–
3.15
High Dark Sample Output Current
–
17, 18,
Red
19
3.95
–
Green
3.95
–
Blue
3.95
–
Dark Sample Cathode Current 5.0 to 15 µA, DC
DAC Set to Zero, See Figure 1
mA
–
–
–
Blanking Output Current
–
17, 18,
6.0
–
19
–
mA
Maximum Y to RGB Output Transconductance
Gain DAC Set to Full Scale
–
17, 18,
6.0
7.0
8.0
mA/V
19
Brightness
–
–
V
(00)
–
30
–
(63)
–
–20
–
Wrt Dark Sample Cathode Voltage,
High Voltage Output Stage Transimpedance
39 kΩ, Dark Sample Cathode Current 15 µA, Dark
Sample Cathode Voltage 140 V
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
µA/µA
Leakage Loop
Sink Current
Source Current
Average Beam Current Detection Level
Excess Flag
Overload Flag
Peak Beam Current Detection Level
–
20
20
–
5.0
–
µA
–
–
–
9
V
0.9
1.0
1.1
–1.3
–1.2
–1.1
–
20
6.5
6.8
7.1
V
Pins 17, 18, 19
MC44002/7P
Figure 1. Example of Output Circuitry
VP
RP
lodk
RFDBK
Picture Tube
Vdk Cathode
Vref
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 kΩ
RFDBK = 39 kΩ
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.
10
MOTOROLA ANALOG IC DEVICE DATA
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