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LTC1861IS8 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1861IS8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LTC1860/LTC1861 18601f Figure 4. LTC1861 Operating Sequence MUX ADDRESS Table 1. Multiplexer Channel Selection SGL/DIFF 1 1 0 0 ODD/SIGN 0 1 0 1 CHANNEL # 0 + + – 1 + – + GND – – 186465 TBL1 SINGLE-ENDED MUX MODE DIFFERENTIAL MUX MODE CONV SDI SCK 12 11 10 9 8 7 6 5 4 3 2 1 SDO B11 B10 B8B6 B4B2 B0* Hi-Z B9 B7 B5 B3 B1 S/D O/S DON’T CARE DON’T CARE tCONV 1860 F04 SLEEP MODE *AFTER COMPLETING THE DATA TRANSFER, IF FURTHER SCK CLOCKS ARE APPLIED WITH CONV LOW, THE ADC WILL OUTPUT ZEROS INDEFINITELY Hi-Z tSMPL Figure 5. LTC1861 Transfer Curve VIN* *VIN = (SELECTED “+” CHANNEL) – (SELECTED “–” CHANNEL) REFER TO TABLE 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 • • • 1860 F05 APPLICATIO S I FOR ATIO GENERAL ANALOG CONSIDERATIONS Grounding The LTC1860/LTC1861 should be used with an analog ground plane and single point grounding techniques. Do not use wire wrapping techniques to breadboard and evaluate the device. To achieve the optimum performance, use a printed circuit board. The ground pins (AGND and DGND for the LTC1861 MSOP package and GND for the LTC1860 and LTC1861 SO-8 package) should be tied directly to the analog ground plane with minimum lead length. Bypassing For good performance, the VCC and VREF pins must be free of noise and ripple. Any changes in the VCC/VREF voltage with respect to ground during the conversion cycle can induce errors or noise in the output code. Bypass the VCC and VREF pins directly to the analog ground plane with a minimum of 1 µF tantalum. Keep the bypass capacitor leads as short as possible. Analog Inputs Because of the capacitive redistribution A/D conversion techniques used, the analog inputs of the LTC1860/ LTC1861 have capacitive switching input current spikes. These current spikes settle quickly and do not cause a problem if source resistances are less than 200 Ω or high speed op amps are used (e.g., the LT ®1211, LT1469, LT1807, LT1810, LT1630, LT1226 or LT1215). But if large source resistances are used, or if slow settling op amps drive the inputs, take care to ensure the transients caused by the current spikes settle completely before the conver- sion begins. |
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