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| NTE7048 Integrated Circuit NTSC Decoder w/Fast RGB Blanking Description: The NTE7048 is a monolithic integrated decoder for the NTSC color television standard. This device combines all functions required for the identification and demodulation of NTSC signals ina 20-Lead DIP type package. Furthermore, it contains a luminance amplifier, an RGB-matrix and amplifier. These amplifiers supply output signals up to 5VP-P (Picture information) enabling direct drive of discrete output stages. Features: D Automatic Chrominance Leveling (Avoids Saturation at the Chrominance Input) D Peaking Circuit with DC Control D Fast RGB Output Blanking Absolute Maximum Ratings: Supply Voltage (Pin1), VP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V Total Power Dissipation, Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1700mW Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25 to +65C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150C Thermal Resistance, Junction-to-Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50K/W Electrical Characteristics: (TA = +25C, VP = 12V, All voltages referenced to Pin19, unless otherwise specified) Parameter Supply (Pin1) Supply Voltage Supply Current Total Power Dissipation Luminance Amplifier (Pin8) Input Voltage (Peak-to-Peak Value) Input Level before Clipping Input Current Contrast Control Range Input Current Contrast Control I6 V6 < 6V V6 = 2.5V, Note 2 V8(P-P) V8 I8 Note 1 - - - - - 3 450 - 0.15 -17 to +3 0.5 7 - 1.0 1.0 - 15.0 - mV V A dB A mA VP IP Ptot 10.8 - - 12.0 90 1.08 13.2 - - V mA W Symbol Test Conditions Min Typ Max Unit Note 1. Signal with negative going sync; amplitude includes sync. pulse amplitude. Note 2. Peak white limiter active. Electrical Characteristics (Cont'd): (TA = +25C, VP = 12V, All voltages referenced to Pin19, unless otherwise specified) Parameter Peaking of Luminance Signal Input Impedance (Pin15) Output Impedance (Pin10) Luminance Gain Ratio Chrominance Amplifier (Pin3) Input Signal Amplitude (Peak-to-Peak Value) V3(P-P) Note 4 Note 5 Minimum Burst Signal Amplitude within the ACC Control Range (Peak-to-Peak Value) Change of Red Output Signal over 30dB ACC Control Range Input Impedance (Pin3) Input Capactiance Saturation Control Range Saturation Control Input Current (Pin5) Input Impedance (Pin5) I5 |Z5| V5 < 6V V5 = 6V to 10V Color Killer Active Tracking Between Luminance and Chrominance Contrast Control ALC Circuit Chrominance/Burst Ratio at which ALC Commences Reference Part (Note 7) Phase-Locked-Loop Phase-Locked-Loop Catching Range Phase Shift for 400Hz Deviation of fOSC Oscillator (See Note 7) Oscillator Temperature Coefficient of Oscillator Frequency Frequency Deviation Input Resistance (Pin18) Input Capacitance (Pin18) TCOSC fOSC R18 C18 VP = 10% - - 1.0 - -1.5 150 1.4 - -2.5 250 1.8 10 Hz/K Hz k pF f 300 - 400 - - 5 Hz deg Note 6 - 2.9 - For 10dB of Control V12 |Z3| C3 - - 35 - 6 - 50 - 1.5 1.5 - 550 - - - 9 4 - 1 2.1 2.1 1 - 1100 - 2 12 6 - 20 2.7 2.7 2 mV mV mV dB k pF dB A k k dB |Z15| |Z10| Note 3 7 50 - 10 75 10 13 90 - k Symbol Test Conditions Min Typ Max Unit Note Note Note Note 3. Pin10 AC short-circuit to GND. 4. Indicated is a signal for color bar with 75% saturation, so the chrominance to burst ratio is 2.2:1. 5. Before clipping occurs in the input stage. 6. The ALC circuit limits the chromunance amplitude to a particular value as soon as the chrominance/burst ratio exceeds 2.9: to 1. The limiting is performed via the ACC function. Note 7. All frequency variations are referenced to the 3.58MHz carrier frequency. Electrical Characteristics (Cont'd): (TA = +25C, VP = 12V, All voltages referenced to Pin19, unless otherwise specified) Parameter Reference Part (Cont'd) (Note 7) ACC Generation (Pin4) Control Voltage at Nominal Input Signal Control Voltage without Burst Input Color-Off Voltage Color On/Off Voltage Control Voltage at Nominal Input Signal (Pin2) Hue Control Input Current (Pin17) Input Impedance (Pin17) I17 |Z17| V12/V14 V13/V12 V13/V14 17 V12, V13, V14(p-p) V14(p-p) V12, V13, V14 (m) I12, I13, I14 V12, V13, V14 -I9 V/T V Note 12 Note 9 Note 10 Note 11 V17 < 5V V15 > 5V No (R - Y) Signal No (B - Y) Signal No (R - Y) Signal - 1.5 0.5 2.5 20.0 3.5 A k V4 V2 V4 - - - 100 - 5.2 2 2.6 300 5.2 - - - 500 - V V V mV V Symbol Test Conditions Min Typ Max Unit Demodulator Part; Ratio of Demodulated Signals 25% (Note 8) (R - Y)/(B - Y) (G - Y)/(R - Y) (G - Y)/(B - Y) Frequency Response between 0 and 0.7MHz RGB Matrix and Amplifiers Output Signal Amplitude (Peak-to-Peak Value) Output Signal Amplitude of the "Blue" Channel (B - Y) at Pin14 (Peak-to-Peak Value) Maximum Peak-White Level Available Output Current (Pin12, Pin13, Pin14) Difference in Black Level between the Three Channels Brightness Control Input Current Variation of Black Level with Temperature Variation of Black Level with Contrast 4.0 - 9.0 10 - 5.0 3.8 9.3 - - 6.0 - 9.6 - 600 V V V mA mV - - - - -0.29 -0.39 -0.10 - - - - -3 dB - - - - 0.15 75 -50 1.0 200 A mV/K mV Note 7. All frequency variations are referenced to the 3.58MHz carrier frequency. Note 8. These matrixed values are found when hue is in a normal condition and by measuring the ratio of the various output signals. The values are derived from the following matrix equations: (R - Y)matrixed = 1.29 (R - Y)IN - 0.29 (B - Y)IN (G - Y)matrixed = -0.50 (R - Y)IN - 0.10 (B - Y)IN (B - Y)matrixed = (B - Y)IN Note 9. With nominal luminance and contrast (black-to-white), nominal contrast is specified as maximum contrast -4dB and nominal saturation as maximum saturation -9dB. Note10. With nominal contrast, saturation and hue, no luminance input. Note 11. When this level is exceeded the amplifier of the output signal is reduced via a discharge of the capacitor on Pin6 (contrast control). Discharge current is 7mA. Note12. Control range: Nominal -10dB. Electrical Characteristics (Cont'd): (TA = +25C, VP = 12V, All voltages referenced to Pin19, unless otherwise specified) Parameter RGB Matrix and Amplifiers (Cont'd) Relative Spread between the R, G, and B Output Signals (Black-White) Relative Black-Level Variation between the Three Channels During Variation of Contrast Relative Black-Level Variation between the Three Channels During Variation of Brightness Blanking Level at the RGB Outputs Differential Drift of the Blanking Levels Over a Temperature Range of 40C Tracking of Output Black Level with Supply Voltage Signal-to-Noise Ratio of Output Signals Residual 3.58MHz Signal at RGB Outputs (Peak-to-Peak Value) Residual 7.1MHz Signal at the RGB Outputs (Peak-to-Peak Value) Output Impedance |Z10| |Z11| |Z12| Frequency Response of Total Luminance and RGB Amplifier Circuits for f = 0 to 5MHz Sandcastle Input Level at which the RGB Blanking is Activated Level at which the Burst Gate Clamping Pulses are Separated Delay between Black Level Clamping and Burst Gating Pulse Input Current V7 V7 td -I7 I7 Fast Blanking Level at which the Fast Blanking is Activated (Pin11) Allowable Voltage at Blanking Input Delay between Fast Blanking Input and Output Input Current Difference between Normal Black-Level and the Fast Blanking Black-Level V11 V11 td I11 V11 = 3.5V 3.5 - - - - - - 40 160 -0.9 - 5 - - - V V ns A V V7 = 0 to 0.8V V7 = 1V to 8V V7 = 8.5V to 12V 1.0 6.5 300 - - - 1.5 7.0 375 - - - 2.0 7.5 450 -1 -40 2 V V ns mA A mA Note 16 Vblk V DVbl x Vf Vbl DVF Symbol Test Conditions Min - Typ - - - 2.15 0 1.05 - 50 50 - - - - Max 10 20 20 2.35 20 1.1 - 75 75 50 50 50 -3 Unit % mV mV V mV Note 13 Note 14 - - 1.95 - 1.0 S/N VR(p-p) Note 15 62 - - - - - - dB mV mV dB Note13. During variations of contrast (10dB) at nominal saturation. Note14. During variations of brightness (1V) at nominal controls. Note15. The signal-to-noise ratio is specified as peak-to-peak signal with respect to RMS noise. The effective bandwidth is 5MHz. Note16. Disconnected peaking capacitor. Pin Connection Diagram Supply Voltage Peak Detector Gain Control Input Chrominance Input ACC Control Input Saturation Control Input Contrast Control Input Sandcastle Input Luminance Input Brightness Control Input 1 2 3 4 5 6 7 8 9 20 Bias Capacitor Input 19 GND 18 OSC Frequency Input 17 Hue Control Input 16 Phase Detection Network 15 Control Input (DC) for Luminance Overshoot 14 Blue Output 13 Green Output 12 Red Output 11 Fast Blanking Input Setting of Luminance Overshoot Level 10 20 1 11 .280 (7.12) Max 10 .995 (25.3) Max .280 (7.1) .300 (7.62) .100 (2.54) .125 (3.17) Min .385 (9.8) |
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