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LT1675-1 Datasheet(PDF) 9 Page - Linear Technology |
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LT1675-1 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT1675/LT1675-1 APPLICATIONS INFORMATION Power Supplies The LT1675 will function with supply voltages below ±2V (4V total), however, to ensure a full 1VP-P video signal (2VP-P at the output pins), the power supply voltage should be between ±4V to ±6V. The LT1675 is designed to operate on ±5V, and at no time should the supplies exceed ±6V. The power supplies should be bypassed with quality tantalum capacitors. It may be necessary to add 0.01 µF or 0.1µF in parallel with the tantalum capacitors if there is excessive ringing on the output waveform. Even though the LT1675 is well behaved, bypass capacitors should be placed as close to the LT1675 as possible. Smallest Package and PC Board Space The LT1675 has the internal gain set for + 2V/V or 6dB, because it is designed to drive a double-terminated 50 Ωor 75 Ω cable that has an inherent 6dB loss. There are several advantages to setting the gain internally. This topology eliminates six gain set resistors, reduces the pin count of the package and eliminates stray capacitance on the sensitivity feedback node. The LT1675 fits into the small SSOP package, and these advantages lead to the smallest PC board footprint with enhanced performance. The LT1675-1 eliminates two gain set resistors and is available in the tiny MSOP package and the cost-effective SO-8 package. Fast Switching The key to the LT1675 fast switching speed is Linear Technology’s proprietary high speed bipolar process. Internal switches can change state in less than 1ns, but the output of the MUX switches in about 2.5ns, as shown in Figure 1. The additional delay is due to the finite bandwidth and the slew rate of the current feedback amplifier that drives the cable. For minimum ringing, it is important to minimize the load capacitance on the output of the part. This is normally not a problem in a controlled impedance environment, but stray PC board capacitance and scope probe capacitance can degrade the pulse fidelity. Figure 2 shows the response of the output to various capacitive loads mea- sured with a 10pF scope probe. MEASURED AT PIN 15 RL = 150Ω, 10pF SCOPE PROBE 1675 F02 CL = 20pF CL = 10pF CL = 0pF 2V/DIV Figure 2. Response to Capacitive Loads 1V/DIV 500mV/DIV 0V 3V SELECT PIN 10 RED OUT PIN 15 RED 1 = 1V, RED 2 = 0V MEASURED BETWEEN 75 Ω BACK TERMINATION AND 75 Ω LOAD 1675 F01 Figure 1. Toggling at 25MHz |
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Similar Description - LT1675-1 |
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