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LM2467 数据表(PDF) 5 Page - National Semiconductor (TI) |
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LM2467 数据表(HTML) 5 Page - National Semiconductor (TI) |
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5 / 43 page  DAC Output Electrical Characteristics Unless otherwise noted: T A = 25˚C, VCC = +5.0V, VIN = 0.7V, VABL =VCC,CL = 8 pF, Video Outputs = 2.0 VP-P. See (Note 7) for Min and Max parameters and (Note 6) for Typicals. DAC parameters apply to all 4 DACs. Symbol Parameter Conditions Min Typ Max Units V Min DAC Min Output Voltage of DAC Register Value = 0x00 0.5 0.7 V V Max DAC Mode 00 Max Output Voltage of DAC Register Value = 0xFF, DCF[1:0] = 00b 4.2 V V Max DAC Mode 01 Max Output Voltage of DAC in DCF Mode 01 Register Value = 0xFF, DCF[1:0] = 01b 2.35 V ∆V Max DAC (Temp) DAC Output Voltage Variation with Temperature 0 < T < 70˚C ambient ±0.5 mV/˚C ∆V Max DAC (VCC) DAC Output Voltage Variation with V CC V CC varied from 4.75V to 5.25V, DAC register set to mid-range (0x7F) 50 mV Linearity Linearity of DAC over its Range 5 % Monotonicity Monotonicity of the DAC Excluding Dead Zones ±0.5 LSB I MAX Max Load Current 1.0 mA System Interface Signal Characteristics Unless otherwise noted: T A = 25˚C, VCC = +5.0V, VIN = 0.7V, VABL =VCC,CL = 8 pF, Video Outputs = 2.0 VP-P. See (Note 7) for Min and Max parameters and (Note 6) for Typicals. DAC parameters apply to all 4 DACs. Symbol Parameter Conditions Min Typ Max Units V VTH+ VFLYBACK Positive Switching Guarantee Vertical Blanking triggered 2.0 V V SPOT Spot Killer Voltage Table 14,V CC Adjusted to Activate 3.4 3.9 4.3 V V Ref V Ref Output Voltage (pin 2) 1.25 1.45 1.65 V V IL (SCL, SDA) Logic Low Input Voltage −0.5 1.5 V V IH (SCL, SDA) Logic High Input Voltage 3.5 V CC + 0.5 V I L (SCL, SDA) Logic Low Input Current SDA or SCL, Input Voltage = 0.4V ±10 µA I H (SCL, SDA) Logic High Input Voltage SDA or SCL, Input Voltage = 4.5V ±10 µA V OL (SCL, SDA) Logic Low Output Voltage I O = 3 mA 0.5 V f H Min Minimum Horizontal Frequency PLL & OSD Functioning; PPL = 0 25 kHz f H Max Maximum Horizontal Frequency PLL & OSD Functioning; PPL = 4 110 kHz I HFB IN Max Horizontal Flyback Input Current Absolute Maximum during Flyback 5mA I IN Peak Current during Flyback Design Value 4 mA I HFB OUT Max Horizontal Flyback Input Current Absolute Maximum during Scan −700 µA I OUT Peak Current during Scan Not exact - Duty Cycle Dependent −550 µA I IN THRESHOLD I IN H-Blank Detection Threshold 0 µA t H-BLANK ON H-Blank Time Delay - On + Zero crossing of I HFB to 50% of output blanking start. I 24 = +1.5mA 45 ns t H-BLANK OFF H-Blank Time Delay - Off − Zero crossing of I HFB to 50% of output blanking end. I 24 = −100µA 85 ns V BLANK Max Maximum Video Blanking Level Test Setting 4, AC input signal 0 0.25 V f FREERUN Free Run H Frequency, Including H Blank 42 kHz t PW CLAMP Minimum Clamp Pulse Width See (Note 15) 200 ns V CLAMP MAX Maximum Low Level Clamp Pulse Voltage Video Clamp Functioning 2.0 V V CLAMP MIN Minimum High Level Clamp Pulse Voltage Video Clamp Functioning 3.0 V I CLAMP Low Clamp Gate Low Input Current V 23 = 2V −0.4 µA www.national.com 5 |
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