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MAX4655ETA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX4655ETA Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Detailed Description The MAX4655–MAX4658 are single SPST CMOS ana- log switches. The CMOS switch construction provides rail-to-rail signal handling while consuming very little power. The switch is controlled by a TTL/CMOS level compatible digital input. The MAX4655/MAX4657 are normally closed switches, and the MAX4656/MAX4658 are normally open switches. These devices can be operated with either single power supplies or dual power supplies. Operation at up to ±20V supplies allows users a wide switching dynamic range. Additionally, asymmetrical operation is possible to tailor performance to a particular application. These switches have been specifically designed to handle high switch currents, up to 400mA peak current and 300mA continuous currents. In order to do this, a new technique is used to drive the body of the output N-channel device. (Note: the basic switch between the input NC/NO terminal, and the output common terminal consists of an N-channel MOSFET and a P-channel MOSFET in parallel.) The standard method limits opera- tion to approximately a 600mV drop across the switch. More than 600mV causes an increase in IdON leakage current (due to the turn-on of on-chip parasitic diodes) and an increase in V+ supply current. With the new sensing method, there is no limitation to the voltage drop across the switch. Current and voltage are limited only by the power dissipation rating of the package and the absolute maximum ratings of the switch. When the analog input to output voltage drop is approximately 7mV there is an increase in power sup- ply current from typically 90µA to 2mA within a 1mV to 7mV range, caused by the new sensing/driving circuitry. 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. First, connect GND, followed by V+, V-, and the remain- ing pins. If power-supply sequencing is not possible, add two small signal diodes (D1, D2) in series with sup- ply 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. The protec- tion diode for the negative supply is not required when V- is connected to GND. 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. This effect is more pronounced with higher source and load imped- ances. Above 5MHz, circuit board layout becomes critical. The graphs shown in the Typical Operating Characteristics were taken using a 50 Ω source and load connected with BNC connectors. High-Current, 10 Ω, SPST, CMOS Analog Switches _______________________________________________________________________________________ 7 V+ COM_ V- NO_ Vg V+ V- Figure 1. Overvoltage Protection Using Blocking Diodes |
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