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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: (TA = +25C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4V Circuit Voltage V1-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0/14.4V V3,6,7,8,9-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0/V1-13-1V V11-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2/(V1-13)-1 V15,18,21-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0/(V1-13)V Circuit Current I10, 14, 17, 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30/10mA I16,19,22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1/3mA Power Dissipation (TA = +70C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1040mW Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150C Electrical Characteristics: (TA = +25C, VCC = 12V unless otherwise specified)
Parameter Total Circuit Current Circuit Voltage Symbol Itot V10,14, 17,20-13 V16,19,
22-13
Test Conditions VCC = 12V VCC = 12V
Min 32 7.7 3.0
Typ 47 8.0 3.5
Max 62 8.3 4.0
Unit mA V V
Electrical Characteristics (Cont'd): (TA = +25C, VCC = 12V unless otherwise specified)
Parameter TV Signal Voltage Amp. Relative Voltage Amp AV1 TV Signal Frequency Characteristics Symbol AV1 AV1 fV Test Conditions f = 500kHz, Sine Wave signal 1Vp-p f = 500kHz, Sine Wave signal 1Vp-p Sine wave signal 1Vp-p, Frequency in which AV1 becomes -3dB Character Input 1Vp-p, Contrast max. Character Input 1Vp-p, Relative output voltage Contrast max./min. V3 = V9 = 6V V3 = V9 = 6V V3 = V9 = 6V V3 = V9 = 6V Min 0.95 0.95 20 Typ 0.98 1.00 - Max 1.00 1.05 - Unit times times MHz
Character Signal Voltage Amp AV2 Relative Voltage Amp. Character Signal Contrast Ratio Character Signal Rise/Fall Time Character Signal Rise Delay Time Character Signal Fall Delay Time Character Signal tdr, tdf 3-channel Mutual Difference TX-TV Changeover Rise Delay Time TX-TV Changeover Fall Delay Time TX-TV Changeover tdr, tdf Mutal Difference TX-TV Discrimination Level Crosstalk between TV Signal Channels Crosstalk between Character Signal Channels TV-to-Character Changeover Crosstalk Pedestal Deflection of Character Signal Contrast Change TV Signal Input DC Level Standard TX-TV Signal Input Level Standard
AV2 AV2 eo tr(TX), tf(TX) td-r(TX) td-f(TX) td(TX)
3.0 0.85 3.0 - - - - - - - 0.50 40 40 40
3.4 1.00 3.5 35 25 30 - 60 50 - 0.65 45 45 45 0 - -
3.8 1.15 4.0 60 60 60 20 80 70 20 0.70 - - - 150 10.5 6.0
times times times ns ns ns ns ns ns ns V dB dB dB mV V V
td-r(TX/TV) V3 = V9 = 6V td-f(TX/TV) V3 = V9 = 6V td(TX/TV) Vt(TX/TV) CTTV CTTX CTTX/TV ETP-C TV1 TX/TV1 Brightness typ., Contrast Min to Max TV input signal level (R-Y) TV, (G-Y) TV, (B-Y) TV, YTV V3 = V9 = 6V
- 2.0 0
Pin Connection Diagram
VCC 1 Pedestal Clamp Filter 2 Contrast Control 3 Blanking Pulse Input 4 Shadow Input 5 Clamp Pulse Input 6 RTX Adjust 7 RTX Adjust 8 Brightness Control 9 Y Output 10 YTV Input 11
22 RTX Input 21 (R - Y)TV Input 20 R Output 19 GTX Input 18 (G - Y)TV Input 17 G Output 16 BTX Input 15 (B - Y)TV Input 14 B Output 13 GND 12 TX/TV Change Input
22
12 .410 (11.41)
1
11
1.300 (33.0)
.400 (10.16)
.216 (5.5)
.100 (2.54) 1.000 (25.4)
.110 (2.79)

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