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MAX4605EPE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4605EPE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 5 Ω, Quad, SPST, CMOS Analog Switches 8 _______________________________________________________________________________________ Applications Information Overvoltage Protection Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maxi- mum ratings, because stresses beyond the listed rat- ings can cause permanent damage to the devices. Always sequence V+ on first, then V-, followed by the logic inputs, NO, or COM. If power-supply sequencing is not possible, add two small signal diodes (D1, D2) in series with supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog signal range to one diode drop below V+ and one diode drop above V-, but does not affect the devices’ low switch resistance and low leakage characteristics. Device operation is unchanged, and the difference between V+ and V- should not exceed 44V. These protection diodes are not recommended when using a single supply. Off-Isolation at High Frequencies In 50 Ω systems, the high-frequency on-response of these parts extends from DC to above 100MHz with a typical loss of -2dB. When the switch is turned off, how- ever, it behaves like a capacitor, and off isolation decreases with increasing frequency. (Above 300MHz, the switch actually passes more signal turned off than turned on.) This effect is more pronounced with higher source and load impedances. Above 5MHz, circuit board layout becomes critical, and it becomes difficult to characterize the response of the switch independent of the circuit. The graphs shown in the Typical Operating Characteristics were taken using a 50 Ω source and load connected with BNC connec- tors to a circuit board deemed “average;” that is, designed with isolation in mind, but not using strip-line or other special RF circuit techniques. For critical appli- cations above 5MHz, use the MAX440, MAX441, and MAX442, which are fully characterized up to 160MHz. COM_ V- V+ NO_ * INTERNAL PROTECTION DIODES D2 D1 -15V +15V MAX4604 MAX4605 MAX4606 * * * * tr < 20ns tf < 20ns 50% 0 LOGIC INPUT V- -15V RL 100 Ω NO_ OR NC_ GND CL INCLUDES FIXTURE AND STRAY CAPACITANCE. VO = VCOM ( RL ) RL + RON SWITCH INPUT IN_ +3V tOFF 0 COM_ SWITCH OUTPUT 0.9V0 0.9V0 tON VO SWITCH OUTPUT LOGIC INPUT LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. VL V+ CL 35pF +5V +15V VO VCOM_ 0 REPEAT TEST FOR EACH SWITCH. FOR LOAD CONDITIONS, SEE Electrical Characteristics. MAX4604 MAX4605 MAX4606 Figure 1. Overvoltage Protection Using External Blocking Diodes Figure 2. Switching-Time Test Circuit |
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