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LM2467 bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI) |
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LM2467 bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI) |
6 / 43 page System Interface Signal Characteristics (Continued) 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 I CLAMP High Clamp Gate High Input Current V 23 = 3V 0.4 µA t CLAMP-VIDEO Time from End of Clamp Pulse to Start of Video Referenced to Blue, Red and Green inputs 50 ns Note 1: Limits of Absolute Maximum Ratings indicate below which damage to the device must not occur. Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Note 3: All voltages are measured with respect to GND, unless otherwise specified. Note 4: Human body model, 100 pF discharged through a 1.5 k Ω resistor. Note 5: Input from signal generator: tr,tf < 1 ns. Note 6: Typical specifications are specified at +25˚C and represent the most likely parametric norm. Note 7: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may change when the device is not operated under the listed test conditions. Note 8: The supply current specified is the quiescent current for VCC and 5V Dig 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 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. Note 10: 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. 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 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. Note 12: The ABL input provides smooth decrease in gain over the operational range of 0 dB to −5 dB: ∆AABL = 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. Note 13: Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF cap is charged to the specific voltage, then discharged directly into the IC with no external series resistor (resistance of discharge path must be under 50 Ω). Note 14: 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 15: A minimum pulse width of 200 ns is the guaranteed minimum 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. Note 16: Adjust input frequency from 10 MHz (AV max reference level) to the −3 dB corner frequency (f−3 dB). Note 17: Once the spot killer has been activated, the LM1236 remains in the off state until VCC is cycled (reduced below 0.5V and then restored to 5V). Hexadecimal and Binary Notation Hexadecimal numbers appear frequently throughout this document, representing slave and register addresses, and register values. These appear in the format “0x...”. For ex- ample, the slave address for writing the registers of the LM1236 is hexadecimal BA, written as 0xBA. On the other hand, binary values, where the individual bit values are shown, are indicated by a trailing “b”. For example, 0xBA is equal to 10111010b. A subset of bits within a register is referred to by the bit numbers in brackets following the register value. For example, the OSD contrast bits are the fourth and fifth bits of register 0x8438. Since the first bit is bit 0, the OSD contrast register is 0x8438[4:3]. Register Test Settings Table 1 shows the definitions of the Test Settings 1–8 re- ferred to in the specifications sections. Each test setting is a combination of five hexadecimal register values, Contrast, Gain (Blue, Red, Green) and DC offset. TABLE 1. Test Settings Control No. of Bits Test Settings 1234 567 8 Contrast 7 0x7F (Max) 0x00 Min 0x7F (Max) 0x7F (Max) 0x40 (50.4%) 0x7F (Max) 0x7F (Max) 0x7F (Max) B, R, G Gain 7 0x7F (Max) 0x7F (Max) 0x7F (Max) Set V O to 2V P-P 0x7F (Max) 0x40 (50.4%) 0x00 (Min) 0x7F (Max) DC Offset 3 0x00 (Min) 0x05 0x07 (Max) 0x05 0x05 0x05 0x05 0x05 Compatibility with LM1237 and LM1247 The Compatibility of the LM1236 to the LM1237 and LM1253A is the same as that of the LM1247. Please refer to the LM1247 datasheet for details. In order to maintain register compatibility with the LM1253A and LM1237 preamplifier datasheet assignments for bias and brightness, the color assignments are recommended as shown in Table 2. If datasheet compatibility is not required, then the DAC assignments can be arbitrary. www.national.com 6 |
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