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MAX4635EUB Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4635EUB Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 11 page Detailed Description The MAX4635/MAX4636 are low-on-resistance (RON), low-voltage, dual SPDT analog switches that operate from a +1.8V to +5.5V supply. The MAX4635/MAX4636 feature very fast switching speed (tON = 14ns max, tOFF = 6ns max) and guaranteed break-before-make switching. The low maximum RON allows high continu- ous currents to be switched in a variety of applications. Applications Information Logic Inputs The MAX4635/MAX4636 logic inputs (IN1, IN2) can be driven up to +5.5V, regardless of the voltage on V+. This allows interfacing to 5V logic signals while operat- ing with a +3.3V supply voltage without external level translation. Analog Signal Levels Analog signals ranging over the entire supply voltage (V+ to GND) can be passed with very little change in on-resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO_, NC_, and COM_ pins may be used as either inputs or outputs. Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum rat- ings because stresses beyond the listed ratings can cause permanent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying ana- log signals, especially if the analog signal is not current limited. If this sequencing is not possible, and if the analog inputs are not current limited to less than 30mA, add a small-signal diode (D1) as shown in Figure 5. If the analog signal can dip below GND, add D2. Adding protection diodes reduces the analog range to a diode drop (about 0.7V) below V+ (for D1), and a diode drop above ground (for D2). Fast, Low-Voltage, Dual 4 Ω SPDT CMOS Analog Switches 8 _______________________________________________________________________________________ CAPACITANCE METER NC_ OR NO_ COM_ GND IN_ VINL OR VINH 10nF V+ f = 1MHz V+ MAX4635 MAX4636 Figure 3. Channel Off/On-Capacitance MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. +5V VOUT V+ IN_ NC_ COM_ NO_ VIN MAX4635 MAX4636 OFF-ISOLATION = 20log VOUT VIN ON-LOSS = 20log VOUT VIN CROSSTALK = 20log VOUT VIN NETWORK ANALYZER 50 Ω 50 Ω 50 Ω 50 Ω MEAS REF 10nF 0 OR V+ 50 Ω GND Figure 4. On-Loss, Off-Isolation, and Crosstalk |
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