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LT1187 Datasheet(PDF) 9 Page - Linear Technology |
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LT1187 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LT1187 9 1187fa Operating with Low Closed-Loop Gains The LT1187 has been optimized for closed-loop gains of 2 or greater. For a closed-loop gain of 2 the response peaks about 2dB. Peaking can be eliminated by placing a capacitor across the feedback resistor, (feedback zero). This peaking shows up as time domain overshoot of about 25%. APPLICATIONS INFORMATION Closed-Loop Voltage Gain vs Frequency FREQUENCY (Hz) 9 LT1187 • AI03 100M 10M 1M 100k 7 5 –1 1 3 VS = ±5V TA = 25°C AV = 2 RFB = 900Ω RG = 900Ω CFB = 0pF 0 2 4 6 8 CFB = 10pF CFB = 5pF Small-Signal Transient Response AV = 2, OVERSHOOT = 25%, RFB = RG = 1k LT1187 • AI04 Small-Signal Transient Response AV = 2, WITH 8pF FEEDBACK CAPACITOR LT1187 • AI05 Extending the Input Range Figure 1 shows a simplified schematic of the LT1187. In normal operation REF, Pin 1, is grounded or taken to a DC offset control voltage and differential signals are applied between Pins 2 and 3. The input responds linearly until all of the 345µA current flows through the 1.1k resistor and Q1 (or Q2) turns off. Therefore the maximum input swing is 380mVP or 760mVP-P. The second differential pair, Q3 and Q4, is running at slightly larger current so that when the first input stage limits, the second stage remains biased to maintain the feedback. Occasionally it is necessary to handle signals larger than 760mVP-P at the input. The LT1187 input stage can be tricked to handle up to 1.5VP-P. To do this, it is necessary to ground Pin 3 and apply the differential input signal between Pins 1 and 2. The input signal is now applied across two 1.1k resistors in series. Since the input signal is applied to both input pairs, the first pair will run out of bias current before the second pair, causing the amplifier to go open loop. The results of this technique are shown in the following scope photo. |
Similar Part No. - LT1187_15 |
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Similar Description - LT1187_15 |
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