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MAX4053CSE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4053CSE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 20 page __________Applications Information Power-Supply Considerations Overview The MAX4051/MAX4052/MAX4053 and MAX4051A/ MAX4052A/MAX4053A construction is typical of most CMOS analog switches. They have three supply pins: V+, V-, and GND. V+ and V- are used to drive the inter- nal CMOS switches and set the limits of the analog volt- age on any switch. Reverse ESD-protection diodes are internally connected between each analog signal pin and both V+ and V-. If any analog signal exceeds V+ or V-, one of these diodes will conduct. During normal operation, these (and other) reverse-biased ESD diodes leak, forming the only current drawn from V+ or V-. Virtually all the analog leakage current comes from the ESD diodes. Although the ESD diodes on a given signal pin are identical, and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V+ or V- and the analog signal. This means their leakages will vary as the signal varies. The difference in the two diode leakages to the V+ and V- pins consti- tutes the analog signal path leakage current. All analog leakage current flows between each pin and one of the supply terminals, not to the other switch terminal. This is why both sides of a given switch can show leakage cur- rents of either the same or opposite polarity. There is no connection between the analog signal paths and GND. Low-Voltage, CMOS Analog Multiplexers/Switches ______________________________________________________________________________________ 11 X 1 Table 1. Truth Table/Switch Programming X X All switches open All switches open All switches open 0 0 COM–NO0 COMB–NO0B, COMC–NO0C COMA–NCA, COMB–NCB, COMC–NCC 0 0 0 1 COM–NO1 COMB–NO1B, COMC–NO1C COMA–NOA, COMB–NCB, COMC–NCC 0 0 1 1 COM–NO3 COMB–NO3B, COMC–NO3C COMA–NOA, COMB–NOB, COMC–NCC 1 0 COM–NO2 COMB–NO2B, COMC–NO2C COMA–NCA, COMB–NOB, COMC–NCC 0 0 0 0 0 1 COM–NO5 COMB–NO1B, COMC–NO1C COMA–NOA, COMB–NCB, COMC–NOC 0 0 COM–NO4 COMB–NO0B, COMC–NO0C COMA–NCA, COMB–NCB, COMC–NOC 1 0 1 0 1 1 COM–NO7 COMB–NO3B, COMC–NO3C COMA–NOA, COMB–NOB, COMC–NOC 1 0 COM–NO6 COMB–NO2B, COMC–NO2C COMA–NCA, COMB–NOB, COMC–NOC 1 0 1 0 X = Don’t care * ADDC not present on MAX4052. Note: NO and COM pins are identical and interchangeable. Either may be considered an input or output; signals pass equally well in either direction. ON SWITCHES ADDRESS BITS ADDB ADDA MAX4051/ MAX4051A MAX4052/ MAX4052A MAX4053/ MAX4053A ADDC* INH |
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