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MAX4648EUT Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4648EUT Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page 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, NC, or COM. If power-supply sequencing is not possible, add two small signal diodes (D1, D2) in series with supply pins (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 50Ω systems, the high-frequency on-response of these parts extends from DC to above 300MHz, 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. This effect is more pronounced with higher source and load imped- ances. Above 5MHz, circuit board layout becomes criti- cal. The graphs shown in the Typical Operating Characteristics were taken using a 50Ω source and load connected with BNC connectors. 25Ω SPST Analog Switches in SOT23-6 6 _______________________________________________________________________________________ tr < 20ns tf < 20ns 50% 0 LOGIC INPUT V- V- RL 300Ω 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. V+ CL 35pF V+ VO VCOM 0 REPEAT TEST FOR EACH SWITCH. FOR LOAD CONDITIONS, SEE Electrical Characteristics. MAX4647 MAX4648 Figure 2. Switching-Time Test Circuit V+ COM D2 D1 V- NO Vg V+ V- MAX4647 MAX4648 Figure 1. Overvoltage Protection Using External Blocking Diodes |
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