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MAX4504 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4504 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page __________Applications Information Power-Supply Considerations The MAX4503/MAX4504’s construction is typical of most CMOS analog switches, except they have only two supply pins: V+ and V-. These voltages set the analog voltage limits of the switch. Reverse ESD-pro- tection diodes are internally connected between IN and each analog signal pin and both V+ and V-. If any ana- log 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 cur- rent drawn from V-. Additional current flows through V+ from the logic-level translator. Virtually all the analog leakage current is provided through 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 constitutes 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 ter- minal. This is why both sides of a given switch can show leakage currents of either the same or opposite polarity. There is no connection between the analog signal paths and V+ or V-. V+ and V- also power the internal logic and logic-level translators. Since there is no ground pin, the logic input has a low-current pull-up to V+ and the logic limit is set by an internal comparator referenced to V+. The logic- level translators convert the logic levels to switched V+ and V- signals, to drive the gates of the analog signals. This drive signal is the only connection between the logic supplies (and signals) and the analog supplies. COM, NO, and NC pins have ESD-protection diodes to V+ and V-. The logic is CMOS compatible when V+ is +5V. CMOS compatibility is maintained with all V+ values, assuming that the CMOS logic is operated from the same V+ sup- ply. Since the MAX4503/MAX4504 have no ground pins, the logic levels are internally referenced to V+. Do not connect the MAX4503/MAX4504 V+ to +3V and connect the logic-level pins to TTL-logic-level signals. TTL levels can exceed +3V and violate the absolute maximum ratings, damaging the part and/or external circuits. High-Frequency Performance In 50 Ω systems, signal response is reasonably flat up to 50MHz. (see Typical Operating Characteristics). Above 20MHz the on-response has several minor peaks which are highly layout dependent. The problem is not in turning the switch on, but in turning it off. The off-state switch acts like a capacitor, and passes higher frequencies with less attenuation. At 10MHz, off isola- tion is about -65dB in 50 Ω systems, becoming worse (approximately 20dB per decade) as frequency increases. Higher circuit impedances also make off iso- lation worse. Low-Voltage, Dual-Supply, SPST, CMOS Analog Switches 6 _______________________________________________________________________________________ ______________________________________________________________Pin Description MAX4503 DIP/SO SOT23-5 FUNCTION 1 1 Analog Switch Common Terminal 2, 3, 5 – No Connect (not internally connected) 8 2 Analog Switch Normally Open Terminal 7 3 Negative (analog) Supply Voltage Input 6 4 Digital Control Input 4 5 Positive (analog and digital) Supply Voltage Input – – Analog Switch Normally Closed Terminal MAX4504 DIP/SO SOT23-5 PIN 1 1 2, 3, 5 – – – 7 3 6 4 4 5 8 2 NAME COM N.C. NO V- IN V+ NC Note: NO, NC, and COM pins are identical and interchangeable. Either may be considered as an input or output; signals pass equally well in both directions. |
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