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LT1225CN8 Datasheet(PDF) 7 Page - Linear Technology |
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LT1225CN8 Datasheet(HTML) 7 Page - Linear Technology |
7 / 8 page 7 LT1225 S APPLICATI I FOR ATIO domain and in the transient response. The photo of the small-signal response with 1000pF load shows 50% peak- ing. The large-signal response with a 10,000pF load shows the output slew rate being limited by the short-circuit current. Lag Compensation Wein Bridge Oscillator AV = –5, CL = 1000pF AV = 5, CL = 10,000pF The LT1225 can drive coaxial cable directly, but for best pulse fidelity the cable should be doubly terminated with a resistor in series with the output. Compensation The LT1225 has a typical gain-bandwidth product of 150MHz which allows it to have wide bandwidth in high gain configurations (i.e., in a gain of 10 it will have a bandwidth of about 15MHz). The amplifier is stable in a noise gain of 5 so the ratio of the output signal to the inverting input must be 1/5 or less. Straightforward gain configurations of 5 or –4 are stable, but there are a few configurations that allow the amplifier to be stable for lower signal gains (the noise gain, however, remains 5 or more). One example is the summing amplifier shown in the typical applications section below. Each input signal has a gain of –RF/RIN to the output, but it is easily seen that this configuration is equivalent to a gain of –4 as far as the amplifier is concerned. Lag compensation can also be used to give a low frequency gain less than 5 with a high frequency gain of 5 or greater. The example below has a DC gain of one, but an AC gain of 5. The break frequency of the RC combination across the amplifier inputs should be approximately a factor of 10 less than the gain band- width of the amplifier divided by the high frequency gain (in this case 1/10 of 150MHz/5 or 3MHz). S APPLICATI TYPICAL Cable Driving Summing Amplifier Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights. LT1225 AI04 LT1225 TA04 R2 250 Ω IN V OUT V R1 1k R3 75 Ω R4 75 Ω 75 CABLE Ω LT1225 + – – + 500 Ω LT1225 100pF VIN VOUT 2k LT1225 TA03 AV = 1, f < 3MHz – + LT1225 100pF VOUT >10VP-P 1MHz LT1225 TA05 430 Ω 100pF 1.5k 1.5k #327 LAMP – + LT1225 VIN1 VOUT RF LT1225 TA06 RIN RIN RIN VIN2 VINn RIN = nRF 4 |
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