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LM1276 Fiches technique(PDF) 5 Page - Texas Instruments |
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LM1276 Fiches technique(HTML) 5 Page - Texas Instruments |
5 / 56 page OBSOLETE LM1276 www.ti.com SNOSAB9B – MAY 2005 – REVISED APRIL 2013 Electrical Characteristics - Video Signal (1) (continued) Unless otherwise noted: TA = 25°C, VCC = +5.0V, VIN = 0.70 VP-P, VABL = VCC, CL = 8 pF, Video Outputs = 2.0 VP-P. Setting numbers refer to the definitions in Table 1. See (2) for Min and Max parameters and (3) for Typicals. Symbol Parameter Conditions Min Typ Max Units tr Video Rise Time(6) 10% to 90%, Test Setting 4, AC input signal. 3.1 ns See(7) OSR Rising Edge Overshoot Test Setting 4, AC input signal. See(7) 2 % tf Video Fall Time(6) 90% to 10%, Test Setting 4, AC input signal. 2.9 ns See(7) OSF Falling Edge Overshoot Test Setting 4, AC input signal. See(7) 2 % BW Channel Bandwidth ( −3 dB) Test Setting 4, AC input signal. See(7) 150 MHz VSEP 10 kHz Video Amplifier 10 kHz Isolation Test Setting 8. See(8) −60 dB VSEP 10 MHz Video Amplifier 10 MHz Test Setting 8. See(8) −50 dB Isolation AV Max Maximum Voltage Gain Test Setting 8, AC input signal. 3.8 4.1 V/V AV C-50% Contrast Attenuation @ 50% Test Setting 5, AC input signal. −5.2 dB AV Min/AV Max Maximum Contrast Attenuation Test Setting 2, AC input signal. −12 dB (dB) AV G-50% Gain Attenuation @ 50% Test Setting 6, AC input signal. −4.0 dB AV G-Min Maximum Gain Attenuation Test Setting 7, AC input signal. −11 dB AV Match Maximum Gain Match between Test Setting 3, AC input signal. ±0.5 dB Channels AV Track Gain Change between Tracking when changing from Test Setting 8 to ±0.5 dB Channels Test Setting 5. See(9) VidThreshold Video Threshold Normal Operation 80 mV VABL TH ABL Control Range Upper Limit Test Setting 4, AC input signal. See(10) 4.8 V VABL Range ABL Gain Reduction Range Test Setting 4, AC input signal. See(10) 2.8 V AV 3.5/AV Max ABL Gain Reduction at 3.5V Test Setting 4, AC input signal. VABL = 3.5V (10) −2 dB AV 2.0/AV Max ABL Gain Reduction at 2.0V Test Setting 4, AC input signal. VABL = 2.0V (10) −12 dB IABL Max ABL Input Current Sink Test Setting 4, AC input signal. See(10) 2.5 mA Capability VABL Max Maximum ABL Input Voltage Test Setting 4, AC input signal. IABL = IABL VCC + 0.1 V during Clamping MAX(10) AV ABL Track ABL Gain Tracking Error Test Setting 4, 0.7 VP-P input signal, ABL 5.0 % voltage set to 4.5V and 2.5V. See(11) RIP Minimum Input Resistance (pins Test Setting 4. 20 M Ω 5, 6, 7) (6) dt/dVCC = 200*(t5.5V–t4.5V)/ ((t5.5V + t4.5V)) %/V, where: t5.5V is the rise or fall time at VCC = 5.5V, and t4.5V is the rise or fall time at VCC = 4.5V. (7) Input from signal generator: tr, tf < 1 ns. (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) ΔAV 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 AVC−50% and measured relative to the AV max condition. For example, at AV max the three amplifiers' gains might be 12.1 dB, 11.9 dB, and 11.8 dB and change to 2.2 dB, 1.9 dB and 1.7 dB, respectively, for contrast set to AVC−50%. This yields a typical gain change of 10.0 dB with a tracking change of ±0.2 dB. (10) The ABL input provides smooth decrease in gain over the operational range of 0 dB to −5 dB: ΔAABL = A(VABL = VABL MAX GAIN) – A (VABL = VABL MIN GAIN) Beyond −5 dB the gain characteristics, linearity and pulse response may depart from normal values. (11) Linearity Error is the maximum variation in step height of a 16 step staircase input signal waveform with a 0.7 VP-P level at the input. All 16 steps equal, with each at least 100 ns in duration. Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM1276 |
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