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LM1270N データシート(PDF) 3 Page - National Semiconductor (TI) |
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LM1270N データシート(HTML) 3 Page - National Semiconductor (TI) |
3 / 27 page Active Video Signal Electrical Characteristics (Continued) Unless otherwise noted: T A = 25˚C, VCC = +5V, VIN = 0.7V, CL = 5 pF, Video Signal Output = 0.7VP-P. Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) Units I CLAMP HIGH Clamp Gate Input Current Default Mode, V 24 = 4V 0.5 0.7 0.9 mA t PW CLAMP Back Porch Clamp Pulse Width Default Mode (Note 15) 200 ns t CLAMP-VIDEO End of Clamp Pulse to Start of Active Video Default Mode, Limit Is Guaranteed by Design 50 ns V CLAMP HIGH OUT Clamp Gate High Output Voltage Internal Clamp Is Output at Pin 24 3.2 V I CLAMP HIGH OUT Clamp Gate High Output Current Internal Clamp Is Output at Pin 24 10 µA V CLAMP LOW OUT Clamp Gate Low Output Voltage Internal Clamp Is Output at Pin 24 0.4 V I CLAMP LOW OUT Clamp Gate Low Output Current Internal Clamp Is Output at Pin 24 −10 µA R IN-VIDEO Input Resistance 20 M Ω V REF REXT V REF REXT Output Voltage 10 k Ω, 1% Resistor; Pin 23 to GND 1.26 1.44 1.64 V V SPOT Spot Killer Voltage V CC Adjusted to Activate 3.40 4.0 4.25 V External Interface Signals Electrical Characteristics Unless otherwise noted: T A = 25˚C, VCC = +5V, VIN = 0.7V, CL = 5 pF, Video Output = 0.7 VP-P. Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) Units V L(I 2C) I 2C compatible Low Input Voltage SDA or SCL Inputs −0.5 1.5 V V H(I 2C) I 2C compatible High Input Voltage SDA or SCL Inputs 3.0 V CC + 0.5 V I L(I 2C) I 2C compatible Low Input Current SDA or SCL, Input Voltage = 0.4V ±10 µA I H(I 2C) I 2C compatible High Input Current SDA or SCL, Input Voltage = 4.5V ±10 µA V OL(I 2C) I 2C compatible Low Output Voltage I O = 3 mA 0.5 V I IN THRESHOLD I IN H-Flyback Detection Threshold −35 µA I IN-OPERATING Minimum — Insure Normal Operation Lowest Operating Horizontal Frequency in Given Application (Note 15) −50 µA Maximum — Should Not Exceed in Normal Operation −550 I IN FLYBACK Peak Current during Flyback Period, Recommended Design Range Operating Range for All Horizontal Scan Frequencies, Maximum Current Should Not Exceed 4 mA (Note 15) 2.0 3.0 4.0 mA Note 1: Limits of Absolute Maximum Ratings indicate limits below which damage to the device must not occur. Note 2: Limits of operating ratings indicate required boundaries of conditions for which the device is functional, but may not meet specific performance limits. Note 3: All voltages are measured with respect to GND, unless otherwise specified. Note 4: Human body model, 100 pF capacitor discharged through a 1.5 k Ω resistor. Note 5: Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF capacitor is charged to the specified voltage, then discharged directly into the IC with no external series resistor (resistance of discharge path must be under 50 Ω). Note 6: Typical specifications are specified at +25˚C and represent the most likely parametric norm. Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 8: The supply current specified is the quiescent current for VCC with RL = ∞. Load resistors are not required and are not used in the test circuit, therefore all the supply current is used by the pre-amp. Note 9: Linearity Error is the variation in step height of a 16 step staircase input signal waveform with a 0.7 VP-P level at the input, subdivided into 16 equal steps, with each step approximately 100 ns in width. Note 10: Input from signal generator: tr,tf < 1 ns. Scope and generator response used for testing: tr = 1.1 ns, tf = 0.9 ns. Using the RSS technique the scope and generator response have been removed from the output rise and fall times. Note 11: ∆AV track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three gain stages. It is the difference in gain change between any two amplifiers with the contrast set to AV 1/2 and measured relative to the AV max condition. For example, at AV max the three amplifiers’ gains might be 0.1 dB, −0.1 dB, and −0.2 dB and change to −5.2 dB, −4.9 dB and −4.7 dB respectively for contrast set to AV 1/2. This yields a typical gain change of −5.0 dB with a tracking change of ±0.2 dB. Note 12: Adjust input frequency from 10 MHz (AV max reference level) to the −3 dB corner frequency (f−3 dB). Note 13: Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. Terminate the undriven amplifier inputs to simulate generator loading. Repeat test at fIN = 10 MHz for VSEP 10 MHz. Note 14: A minimum pulse width of 200 ns is guaranteed for a horizontal line of 15 kHz. This limit is guaranteed by design. If a lower line rate is used then a longer clamp pulse may be required. www.national.com 3 |
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