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LM1279 データシート(PDF) 5 Page - Texas Instruments |
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LM1279 データシート(HTML) 5 Page - Texas Instruments |
5 / 20 page OBSOLETE LM1279 www.ti.com SNOS020B – SEPTEMBER 1998 – REVISED APRIL 2013 AC ELECTRICAL CHARACTERISTICS TA = 25°C; VCC1 = VCC2 = 8V. Manually adjust Video Output pins 13, 15, and 18 to 4V DC for the AC test unless otherwise stated. (1) Symbol Parameter Conditions Typical(2) Limit(3) Units AVmax Video Amplifier Gain V10 = 4V, VIN = 635 mVPP 6.8 5.9 V/V (min) Vdrive = 4V 16.7 15.4 dB (min) ΔAV 2V Contrast Attenuation @ 2V Ref: AV max, V10 = 2V −6 dB ΔAV 0.25V Contrast Attenuation @ 0V Ref: AV max, V10 = 0V −35 dB ΔDrive Drive Control Range Vdrive = 0V to 4V, V10 = 4V 12 dB AV match Absolute Gain Match @ AV max V10 = 4V, Vdrive = 4V (4) ±0.3 dB AV track Gain Change Between Amplifiers V10 = 4V to 2V (4) (5) ±0.3 dB f( −3 dB) Video Amplifier Bandwidth(6)(7) V10 = 4V, Vdrive = 4V, 110 MHz VO = 3.5 VP-P tr(Video) Video Output Rise Time VO = 3.5 VP-P (6) 3.6 ns tf(Video) Video Output Fall Time VO = 3.5 VP-P (6) 3.2 ns Vsep 10 kHz Video Amplifier 10 kHz Isolation V10 = 4V (8) −70 dB Vsep 10 MHz Video Amplifier 10 MHz Isolation V10 = 4V (6) (8) −50 dB ΔVOL(OSD) OSD Black Level, Difference from VOSD in = 0.8V, OSD Mode −0.4 −0.7 V (max) Video Black Level VOH(OSD) OSD Output High Voltage (above VOSD in = 2.5V, OSD Mode 2.1 2.4 V (max) measured video black level) tr(OSD) Going into OSD Mode OSD Mode (See Figure 2) 5.0 ns tf(OSD) Going out of OSD Mode OSD Mode (See Figure 2) 10.0 ns tr-prop(OSD) Starting OSD Propagation Delay Switching to OSD Mode (See 13.0 ns Figure 3) tf-prop(OSD) Ending OSD Propagation Delay Switching to Vid. Mode (See 14.0 ns Figure 3) Tpw(Clamp) Input Clamp Pulse Width (Part of See(9) 200 ns (min) Sandcastle Sync) (1) During the AC test the 4V DC level is the center voltage of the AC output signal. For example, if the output is 4 VPP the signal will swing between 2V DC and 6V DC. (2) Typical specifications are specified at +25°C and represent the most likely parametric norm. (3) Tested limits are specified to TI's AOQL (Average Outgoing Quality Level). (4) Measure gain difference between any two amplifiers. VIN = 635 mVPP. (5) ΔAV track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three attenuators. It is the difference in gain change between any two amplifiers with the contrast voltage (V10) at either 4V or 2V measured relative to an AV max condition, V10 = 4V. For example, at AV max the three amplifiers' gains might be 17.1 dB, 16.9 dB, and 16.8 dB and change to 11.2 dB, 10.9 dB and 10.7 dB respectively for V10 = 2V. This yields the measured typical ± 0.1 dB channel tracking. (6) When measuring video amplifier bandwidth or pulse rise and fall times, a double sided full ground plane printed circuit board without socked is recommended. Video amplifier 10 MHz isolation test also requires this printed circuit board. The reason for a double sided full ground plane PCB is that large measurement variations occur in single sided PCBs. (7) Adjust input frequency from 10 MHz (AV max reference level) to the −3 dB corner frequency (f−3 dB). (8) 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. (9) A minimum pulse width of 200 ns is specified for a horizontal line of 15 kHz. This limit is specified by design. If a lower line rate is used then a longer clamp pulse may be required. Copyright © 1998–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM1279 |
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