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LT1010CDD Datasheet(PDF) 11 Page - Linear Technology |
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LT1010CDD Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  11 LT1010 1010fc APPLICATIO S I FOR ATIO current boost. The appearance is always worse with fast rise signal generators than in practical applications. Track and Hold The 5MHz track and hold shown here has a 400kHz power bandwidth driving ±10V. A buffered input follower drives the hold capacitor, C4, through Q1, a low resistance FET switch. The positive hold command is supplied by TTL logic with Q3 level shifting to the switch driver, Q2. The output is buffered by A3. When the gate is driven to V – for HOLD, it pulls charge out of the hold capacitor. A compensating charge is put into the hold capacitor through C3. The step into hold is made independent of the input level with R7 and adjusted to zero with R10. Since internal dissipation can be quite high when driving fast signals into a capacitive load, using a buffer in a power package is recommended. Raising buffer quiescent cur- rent to 40mA with R3 improves frequency response. This circuit is equally useful as a fast acquisition sample and hold. An LT1056 might be used for A3 to reduce drift in hold because its lower slew rate is not usually a problem in this application. Current Sources A standard op amp voltage to current converter with a buffer to increase output current is shown here. As usual, A3 LT1010 A2 LT1010 R2 200 Ω R1 50 Ω R3 800 Ω R4 39 Ω R5 39 Ω C1 20pF INPUT 1010 AI11 OUTPUT 1 OUTPUT 2 – + A1 HA2625 OTHER SLAVES The 50 Ω video line splitter here puts feedback on one buffer with the others slaved. Offset and gain accuracy of slaves depend on their matching with master. When driving long cables, including a resistor in series with the output should be considered. Although it reduces gain, it does isolate the feedback amplifier from the effects of unterminated lines which present a resonant load. When working with wideband amplifiers, special atten- tion should always be paid to supply bypassing, stray capacitance and keeping leads short. Direct grounding of test probes, rather than the usual ground lead, is abso- lutely necessary for reasonable results. The LT1010 has slew limitations that are not obvious from standard specifications. Negative slew is subject to glitching, but this can be minimized with quiescent A2 LT1010 – + A3 LT118A A4 LT118A C1 50pF C2 150pF HOLD R2 2k D1 HP2810 Q3 2N2907 V– Q1 2N5432 SD R4 2k Q2 2N2222 R8 5k R9 10k D2* 6V *2N2369 EMITTER BASE JUNCTION OUTPUT R10 50k R5 1k R6 1k C4 1nF C3 100pF C5 10pF R1 2k R3 20 Ω INPUT V+ – + A1 LT118A R11 6.2k 1010 AI12 R7 200k |
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