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ICL7650ITV-1 Datasheet(PDF) 8 Page - Linear Technology |
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ICL7650ITV-1 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LTC1052/LTC7652 8 1052fa Figure 1b. LTC1052 Block Diagram Sampling Cycle THEORY OF OPERATIO LTC1052/7652 • TO02 + – gm6 +IN –IN S1 S3 VREF RL1 V– + – – + – + S2 RL5 VOUT RL4 CEXT A CEXT B RL2 l3 l1 δl l2 C1 C2 + – gm1 gm2 gm3 gm4 gm5 APPLICATIO S I FOR ATIO EXTERNAL CAPACITORS CEXTA and CEXTB are the holding elements of a sample- and-hold circuit. The important capacitor characteristics are leakage current and dielectric absorption. A high quality film-type capacitor such as mylar or polypropylene provides excellent performance. However, low grade capacitors such as ceramic are suitable in many applications. Capacitors with very high dielectric absorption (ceramic) can take several seconds to settle after power is first turned on. This settling appears as clock ripple on the output and, as the capacitor settles, the ripple gradually disappears. If fast settling after power turn-on is important, mylar or polypropylene is recommended. Above 85°C, leakage, both from the holding capacitors and the printed circuit board, becomes important. To maintain the capabilities of the LTC1052 it may be necessary to use Teflon™ capacitors and Teflon standoffs when operating at 125°C (see Achieving Picoampere/ Microvolt Performance). CEXTA and CEXTB are normally in the range of 0.1µF to 1.0µF. All specifications are guaranteed with 0.1µF and the broadband noise (refer to Typical Performance Char- acteristics) is only very slightly degraded with 0.1µF. Output clock ripple is not present for capacitors of 0.1µF or greater at any temperature. On competitive devices, connecting CEXTA and CEXTB to V– causes an increase in amplifier noise. Design changes have eliminated this problem on the LTC1052. On the 14-pin LTC1052 and 8-pin LTC7652, the capacitors can be returned to V– or CRETURN with no change in noise performance. ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes In order to realize the picoampere level of accuracy of the LTC1052, proper care must be exercised. Leakage currents in circuitry external to the amplifier can significantly degrade performance. High quality insulation should be used (e.g., Teflon, Kel-F); cleaning of all insulating surfaces to remove fluxes and other residues will probably be necessary—particularly for high temperature performance. Surface coating may be necessary to provide a moisture barrier in high humidity environments. Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential close to that of the inputs: in inverting configurations, the guard ring should be tied to ground; in noninverting Teflon is a trademark of Dupont. |
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