Description: NTE1890 monolithic integrated decoder NTSC color televisi

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Description: NTE1890 monolithic integrated decoder NTSC color televisi

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NTE1890 Integrated Circuit NTSC Decoder
Description: NTE1890 monolithic integrated decoder NTSC color television standards. combines functions required demodulation NTSC signals. Further more contains luminance amplifier, RGB-matrix amplifier. These amplifiers supply output signals peak-to- peak (picture information) enabling direct drive discrete output stages. Absolute Maximum Ratings: Maximum Supply Voltage (Pin1), V1-23 13.2V Maximum Total Power Disipation, Ptot 1.7W Operating Ambient Temperature Range, -25° +65°C Storage Temperature Range, Tstg -25° +150°C Thermal Resistance, Junction-to-Ambient, RthJA 50K/W Electrical Characteristics: V1-23 12V, +25°C unless otherwise specified)
Parameter Supply (Pin1) Supply Voltage Supply Current Total Power Dissipation Luminance Amplifier (Pin9) Input Voltage (Peak-to-Peak Value, Note Input Level Before Clipping Input Current Contrast Control Range Control Voltage Attenuation 40dB Input Current Contrast Control Peaking Luminance Signal Output Impedance (Pin10) Ratio Internal/External Current when Pin10 Short-Circuited Control Voltage Peaking Adjustment (Pin11) Input Impedance (Pin11) V11-23 |Z11-23| |Z10-23| V9-23(p-p) V9-23 0.15 V1-23 Ptot 12.0 13.2 Symbol Unit
Note Signal with negative-going sync; amplitude includes sync amplitude.
Electrical Characteristics (Cont'd): V1-23 12V, +25°C unless otherwise specified)
Parameter Chrominance Amplifier (Pin3) Input Voltage (Peak-to-Peak Value, Note Input Impedance Input Capacitance Control Range Change Burst Signal Output over Whole Control Range Gain Nominal Contrast/Saturation Pin3 Pin24 (Note Output Voltge (Peak-to-Peak Value Burst Signal 300mV(p-p), (Note Maximum Output Voltage Range (Pin24, Peak-to-Peak Value) Distortion Chrominance Amplifier V24-23(p-p) 0.5V (Output) V3-23(p-p) (Input) Frequency Response Between 5MHz Saturation Control Range Input Current Saturation Control (Pin6) Tracking Between Luminance Chrominance Contrast Control Cross-Coupling Between Luminance Chrominance Amplifier (Note Signal-to-Noise Ratio Nominal Input Signal (Note Phase Shift Between Burst Chrominance Nominal Contrast/Saturation Output Impedance Chrominance Amplifier Output Current Reference Part (Phase-Locked Loop) Catching Range (Note Phase Shift ±400Hz Deviation fOSC (Note Reference Part (Oscillator) Temperature Coefficient Oscillator Frequency (Note Frequency Variation when Supply Voltage Increases from 13.2V (Note Input Resistance (Pin22) Input Capacitance (Pin22) TCOSC fOSC R22-23 C22-23 -1.5 Hz/K |Z24-23| V24-23(p-p) V24-24(p-p) 24-3 V3-23(p-p) |Z3-23| C3-23 1100 Symbol Unit
Note Indicated signal color with saturation; chrominance burst ratio 2.2:1. Note Nominal contrast specified maximum contrast -3dB nominal saturation maximum saturation -6dB. Note Cross coupling measured under following conditions: Input signals nominal. Contrast aturation such that nominal output signals obtained. signals output which signal should available must compared with nominal output signal that output. Note signal-to-noise ratio defined peak-to-peak signal with respect noise. Note frequency variations referred 3.58MHz carrier frequency.
Electrical Characteristics (Cont'd): V1-23 12V, +25°C unless otherwise specified)
Parameter Reference Part (ACC Generation, Pin22) Control Voltage Nominal Input Signal Control Voltage without Chrominance Input Color-Off Voltage Color-On Voltage Change Burst Amplitude with Supply Voltage Voltage Pin4 Nominal Input Signal Reference Part (Hue Control) Control Range Demodulator Part Input Burst Signal Amplitude (Peak-to-Peak Value, Pin17) Input Impedance (Pin17, Note Ratio Demodulated Signals (B-Y)/(R-Y) Ratio Demodulated Signals (G-Y)/(R-Y); (B-Y) Signal Ratio Demodulated Signals (G-Y)/(B-Y); (R-Y) Signal Frequency Response Between 1MHz Crosstalk Between Color Difference Signals Matrix Amplifiers Output Voltage Nominal Input Signal (Peak-to-Peak value, Black-to-White, Note Output Voltage Pin13 Nominal Contrast/Saturation Luminance Signal (R-Y) (Peak-to-Peak Value) Maximum Peak-White Level (Note Maximum Output Current (Pin13, Pin14, Pin15) Output Black Level Voltage Brightness Control Voltage Pin12 Black Level Shift with Vision Contents Brightness Control Input Current Variation Black Level with Temperature Variation Black Level with Contrast Relative Spread Between Output Signals Relative Black-Level Varition Between Three Channels During Variation Contrast, Brightness Supply Voltage Differential Black-Level Drift Over Temperature Range 40°C V13, 15-23(p-p) V13-23(p-p) V13, 15-23 I13, V13, 15-23 5.25 0.35 mV/K V17-23(p-p) |Z17-23| V15-23/V13-23 V14-23/V13-23 V14-23/V15-23 0.26 0.22 V4-23 V2-23 V2-23 V2-23 V2-23 Independent Symbol Unit
Note Nominal contrast specified maximum contrast -3dB nominal saturation maximum saturation -6dB. Note These signal amplitudes determined circuit reference part. Note typical voltage this white level exceeded, output voltage reduced discharging capacitor Pin7 (contrast control); discharge current 1.5mA.
Electrical Characteristics (Cont'd): V1-23 12V, +25°C unless otherwise specified)
Parameter Matrix Amplifiers (Cont'd) Blanking Level Outputs Difference Blanking Level Three Channels Differential Drift Blanking Levels over Temperatue Range 40°C Tracking Output Black Level with Supply Voltage Signal-to-Noise Ratio Output Signals (Note Residual 7.1MHz Signal Higher Harmonics Outputs (Peak-to-Peak Value) Output Impedance Outputs Frequency Response Total Luminance Amplifier Circuits 5MHz Sandcastle Input (PIn8) Level which Blanking Activated Level which Burst Gate Clamping Pulse Separated Delay Bteween Black Level Clamping Burst Gate Pulse Input Current V8-23 Input Current V8-23 8.5V Input Current V8-23 8.5V V8-23 V8-23 |Z13, 15-23| Symbol Unit
Note signal-to-noise ratio defined peak-to-peak signal with respect noise. Functional Description: Luminance Amplifier luminance amplifier voltage driven requires input signal 450mV peak-to-peak (positive video). luminance delay line must connected between amplifier decoder. input signal must coupled input Pin9. black level output preamplifier clamped fixed level black level clamping circuit. high input impedance luminance amplifier minimizes disturbance input signal black level source impedance (delay line matching resistors). During clamping input impedance reduces noise residual signals. After clamping signal peaking stage. overshoot defined capacitor connected Pin10 peaking adjusted control voltage Pin11. peaking stage followed contrast control stage. contrast control voltage range (Pin7) nominally +3dB. Chrominance Amplifier chrominance amplifier asymmetrical input. input signal must coupled (Pin3) have minimum amplitude 55mV peak-to-peak. gain control stage control range excess 30dB, maximum input signal should exceed 1.1V peak-to-peak, otherwise clipping input signal will occur. From gain control stage chrominance signal saturation contrast control stages. Chrominance luminance control stages directly coupled obtain good tracking. Saturation linearly controlled Pin6. control voltage range input impedance high saturation control range excess 50dB. burst signal affected saturation control. output signal Pin24 coupled demodulators Pin17.
Functional Description (Cont'd): Oscillator Detector 7.16MHZ reference oscillator operates twice subcarrier frequency. reference signals (R-Y) (B-Y) demodulators, burst phase detector, detector obtained divide-by-2 circuit, which provides phase shift. oscillator controlled burst phase detector, which gated with narrow part sandcastle pulse (Pin8). burst phase detector asymmetrical output oscillator adjusted changing voltage output (Pin21) high-ohmic resistor. capacitor series with oscillator crystal must then have fixed value. When Pin6 (saturation control) connected positive supply line burst signal suppressed color killer overruled. This position therefore used adjustment oscillator. adjustment visible screen. control obtained changing phase input signal burst phase detector with respect chrominance signal applied demodulators. This phase shift obtained generating shift sine-wave Miller integrator (biased Pin19) which mixed with original burst signal. control circuit required phase shift circuit make chrominance voltage independent setting. This control circuit decoupled capacitor connected Pin5. shifted burst signal synchronously demodulated separate detector generate voltage, affected control. output pulses this detector peak detected (Pin4) control gain chrominance amplifier, thus preventing blooming-up color during weak signal reception. This ensures reliable operation color killer. During color killing color channel blocked switching-off saturation control demodulators. Demodulators (R-Y) (B-Y) demodulators driven chrominance signal (Pin24) reference signals from 7.16MHZ divider circuit. phase angle between reference carriers 115°. This achieved (R-Y) demodulator receiving additional phase shift mixing signals from divider circuit. phase shift 115° varied between 140° changing bias voltage Pin18. demodulator output signals matrix circuits (G-Y) matrix provide (G-Y) signal which applied matrix. demodulator circuits killed blanked bypassing input signals. Matrix Amplifiers three matrix amplifier circuits identical only circuit will described. luminance color difference signals added matrix circuit obtain color signal. Output signals (p-p) (black-white) following nominal input signals control settings. Luminance 450mV(p-p) Chrominance 550mV(p-p) (burst-to-chrominance ratio input 2.2) Contrast-3dB Saturation-6dB maximum output voltage approximately 7V(p-p). black level blue channel compared with variable external reference level (Pin12), which provides brightness control. brightness control range 3.2V. control voltage stored capacitor (connected Pin16) controls black level output (Pin15) between change level luminance signal before matrixing. Note Black levels approximately possible, amplitude output signal reduced 3V(p-p). output signal surpasses level peak-white limiter circuit becomes active reduces output signal contrast control.
Functional Description (Cont'd): Blanking Signals signals blanked sandcastle input (Pin8). slicing level 1.5V used this blanking function, that wide part sandcastle pulse separated from remainder pulse. During blanking level available output.
Connection Diagram
Detector Chroma Input Peak Detector Decoup Saturation Control Contrast Control Sandcastle Pulse Luminance Input Peaking Peaking Control Brightness Control
Chroma Output Adjust Control Control Reference Signal Phase Adjust Chroma Demod Input Black Level Clamp Output Blue Output Green Output Output
1.300 (33.02) .225 (5.73)
.520 (13.2)
.100 (2.54) 1.100 (27.94) .126 (3.22) .600 (15.24)

Description: NTE1890 monolithic integrated decoder NTSC color televisi

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