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MAX4536CEE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4536CEE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page __________Applications Information Power-Supply Considerations Overview The MAX4536/MAX4537/MAX4538 construction is typi- cal of most CMOS analog switches. These devices have three supply pins: V+, V-, and GND. V+ and V- drive the internal CMOS switches and set the limits of the analog voltage on any switch. Reverse ESD-protection diodes are internally connected between each analog-signal pin, and both V+ and V-. One of these diodes conducts if any analog signal exceeds V+ or V-. These reverse- biased ESD diodes leak during normal operation, form- ing the only current drawn from V+ or V-. Virtually all the analog leakage current is through the ESD diodes. Although the ESD diodes on a given sig- nal 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 vary as the signal varies. The difference in the two diode leakages from the signal path to the V+ and V- pins constitutes the analog-signal path leakage cur- rent. All analog leakage current flows to the supply ter- minals, not to the other switch terminal. This explains how 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 GND. The analog-signal paths consist of an N-channel and P-channel MOSFET with their sources and drains paralleled and their gates driven out of phase to V+ and V- by the logic-level translators. V+ and GND power the internal logic and logic-level translators and set the input logic thresholds. The logic-level translators convert the logic levels to switched V+ and V- signals to drive the analog switch- es’ gates. This drive signal is the only connection between the logic supplies and the analog supplies. V+, and V- have ESD-protection diodes to GND. The logic-level inputs have ESD protection to V+ and to V-. Increasing V- has no effect on the logic-level thresh- olds, but it does increase the drive to the P-channel switches, reducing their on-resistance. V- also sets the negative limit of the analog-signal voltage. The logic-level thresholds are CMOS/TTL-compatible when V+ is +5V. The threshold increases slightly as V+ is raised. When V+ reaches +12V, the level threshold is about 3.1V, above the TTL output high-level minimum of 2.8V, but still compatible with CMOS outputs. Bipolar Supplies The MAX4536/MAX4537/MAX4538 operate with bipolar supplies between ±2.0V and ±6V. The V+ and V- sup- plies need not be symmetrical, but their sum cannot exceed the absolute maximum rating of 13.0V. Do not connect the MAX4536/MAX4537/MAX4538’s V+ to +3V and then connect the logic-level input pins to TTL logic-level signals. TTL logic-level outputs in excess of the absolute maximum ratings can dam- age the part and/or external circuits. CAUTION: The absolute maximum V+ to V- differen- tial voltage is 13.0V. Typical ±6V or +12V supplies with ±10% tolerances can be as high as 13.2V. This voltage can damage the MAX4536/MAX4537/MAX4538. Even ±5% tolerance supplies may have overshoot or noise spikes that exceed 13.0V. Single Supplies The MAX4536/MAX4537/MAX4538 operate from single supplies between +2.0V and +12V when V- is connect- ed to GND. All of the bipolar precautions must be observed. 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 that are highly layout dependent. The problem with high-frequency operation 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-isolation is about -44dB in 50 Ω systems, becoming worse (approximately 20dB per decade) as frequency increases. Higher circuit impedances also make off-isolation worse. Adjacent channel attenuation is about 3dB above that of a bare IC socket, and is due entirely to capacitive coupling. Quad, Low-Voltage, SPST Analog Switches with Enable 8 _______________________________________________________________________________________ |
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