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参数资料
| 型号： | NTE7133 |
| 厂商： | NTE Electronics, Inc. |
| 英文描述： | Integrated Circuit Horizontal and Vertical Deflection Controller for VGA/XGA and Autosync Monitors |
| 中文描述： | 集成电路水平和垂直偏转控制器为VGA / XGA和自动同步显示器 |
| 文件页数： | 6/7页 |
| 文件大小： | 46K |
| 代理商： | NTE7133 |
Functional Description (Cont
’
d):
P
LL2
Phase Detector
This pahse detector is similar to the P
LL1
phase detector. Line flyback signals (Pin2) are compared
with a fixed point of the oscillator sawtooth voltage. Delays in the horizontal deflection circuit are com-
pensated by adjusting the phase relationship between horizontal sync and horizontal output pulses.
A certain amount of phase adjustment is possible by injecting a DC current froma an external source
into the P
LL2
filter capacitor on Pin20.
Horizontal Driver
This open
–
collector output stage (Pin3) can directly drive an external driver transistor. The saturation
voltage is 300mV at 20mA. To protect the line deflection transistor, the horizontal output stage does
not conduct at V
P
< 6.4V (Pin1).
Vertical Oscillator and Amplitude Control
This stage is designed for fast stabilization of the vertical amplitude after changes in sync conditions.
The free
–
running frequency f
o
is determined by the values of R
VOS
and C
VOS
. The recommended
values should be altered marginally only to preserve the excellent linearity and noise performance.
The vertical drive currents I
5
and I
6
are in relation to the value of R
VOS
. Therefore, the oscillator fre-
quency must be determined only by C
VOS
on Pin16.
f
o
=
1
10.8 x R
VOS
x C
VOS
To acheive a stabilized amplitude the free
–
running frequency f
o
(without adjustment) must be lower
than the lowest occurring sync frequency. The contributions shown in Table 1 can be assumed.
Table 1.
Calculation of f
o
Total Spread
Contributing Elements
%
10
±
3
±
1
±
5
19
Minimum Frequency Offset Between f
o
and the Lowest Trigger Frequency
Spread of IC
Spread of R (22k
)
Spread of C (0.1
μ
F)
Total
Results for 50 to 110Hz application: f
o
=
50Hz
1.19
= 42Hz
Table 2.
VGA Modes
Mode
Horizontal/Vertical
Sync Polarity
Horizontal
Frequency
(kHz)
Vertical
Frequency
(Hz)
Number of
Active Lines
Output
Mode Pin7
1
+/
–
31.45
70
350
LOW
2
–
/+
31.45
70
400
LOW
3
–
/
–
31.45
60
480
LOW
4
+/+
Fixed by External Circuitry
–
–
HIGH
Autosync
*/*
Fixed by External Circuitry
–
–
Forced to GND
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