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