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NTE1835
Integrated Circuit
Interface for Character and Pattern
Description:
The NTE1835 is an integrated circuit designed for interface of decoder outputs or of external analog
input signal in teletext system with the color output.
Features:
D Provides Analog Signal Processing for Character Signal Input
D High Speed Switching:
Rise and Fall Time: 35ns
Delay time: 20ns
D Including DC Controller of Brightness, Contrast, R–Adjustment and B–Adjustment for Character
Signal Input
D Y Amplifier Linear Area’s Bottom: 2.0V
Absolute Maximum Ratings
Supply Voltage, V
CC
: (TA = +25°C unless otherwise specified)
Circuit Voltage
V
1–13
V
3,6,7,8,9–13
V
11–13
V
15,18,21–13
Circuit Current
I
10, 14, 17, 20
I
16,19,22
Power Dissipation (T
Ambient Temperature Range, T
Storage Temperature Range, T
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit
Total Circuit Current I
Circuit Voltage
= +70°C), P
A
: (TA = +25°C, VCC = 12V unless otherwise specified)
opr
stg
D
tot
V
10,14,
17,20–13
V
16,19,
22–13
14.4V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0/14.4V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0/V
1–13
–1V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2/(V1–13)–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0/(V
1–13
–30/10mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–1/3mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1040mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–20° to +70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–55° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC = 12V 32 47 62 mA
VCC = 12V
7.7 8.0 8.3 V
3.0 3.5 4.0 V
)V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
TV Signal Voltage Amp. A
Relative Voltage Amp AV
1
TV Signal Frequency Characteristics f
Character Signal Voltage Amp A
AV2 Relative Voltage Amp. ∆A
Character Signal Contrast Ratio ∆e
Character Signal Rise/Fall Time t
Character Signal Rise Delay Time t
Character Signal Fall Delay Time t
Character Signal tdr, tdf 3–channel
V1
∆A
V1
V
V2
V2
o
r(TX)
t
f(TX)
(TX) V3 = V9 = 6V – 25 60 ns
d–r
(TX) V3 = V9 = 6V – 30 60 ns
d–f
∆td(TX) V3 = V9 = 6V – – 20 ns
Mutual Difference
TX–TV Changeover Rise Delay Time t
TX–TV Changeover Fall Delay Time t
TX–TV Changeover tdr, tdf
(TX/TV) V3 = V9 = 6V – 60 80 ns
d–r
(TX/TV) V3 = V9 = 6V – 50 70 ns
d–f
∆t
d(TX/TV)V3
Mutal Difference
TX–TV Discrimination Level V
Crosstalk between TV
t(TX/TV)
CT
TV
Signal Channels
Crosstalk between Character
CT
TX
Signal Channels
TV–to–Character Changeover
CT
TX/TV
Crosstalk
Pedestal Deflection of Character
∆E
TP–C
Signal Contrast Change
TV Signal Input DC Level Standard TV
1
TX–TV Signal Input Level Standard TX/TV
f = 500kHz, Sine Wave signal 1V
f = 500kHz, Sine Wave signal 1V
Sine wave signal 1V
Frequency in which AV
p–p
,
1
0.95 0.98 1.00 times
p–p
0.95 1.00 1.05 times
p–p
20 – – MHz
becomes –3dB
Character Input 1V
Character Input 1V
, Contrast max. 3.0 3.4 3.8 times
p–p
p–p
,
0.85 1.00 1.15 times
Relative output voltage
Contrast max./min. 3.0 3.5 4.0 times
,
V3 = V9 = 6V – 35 60 ns
= V9 = 6V – – 20 ns
0.50 0.65 0.70 V
40 45 – dB
40 45 – dB
40 45 – dB
Brightness typ., Contrast Min to Max – 0 ±150 mV
TV input signal level (R–Y) TV,
2.0 – 10.5 V
(G–Y) TV, (B–Y) TV, YTV
1
0 – 6.0 V
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Pin Connection Diagram
V
CC
Pedestal Clamp Filter
Contrast Control
Blanking Pulse Input
Clamp Pulse Input
R
Adjust
TX
Adjust
R
TX
Brightness Control
Y Output
Y
Input
TV
1
2
3
4
5Shadow Input
6
7
8
22
21
20
19
18
17
16
15
9 14
10 13
11 12
RTX Input
(R – Y)
TV
Input
R Output
Input
G
TX
(G – Y)
TV
Input
G Output
Input
B
TX
(B – Y)TV Input
B Output
GND
TX/TV Change Input
22 12
.410
(11.41)
111
1.300 (33.0)
.100 (2.54)
1.000 (25.4)
.216
(5.5)
.110 (2.79)
.400 (10.16)
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