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MAX381MJE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX381MJE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Precision, Low-Voltage Analog Switches 8 _______________________________________________________________________________________ __________Applications Information Operation with Supply Voltages Other than ±5V The MAX381/MAX383/MAX385 switches operate with ±3.0V to ±8V bipolar supplies and a +3V to +15V single supply. In either case, analog signals ranging from V+ to V- can be switched. The Typical Operating Characteristics graphs show the typical on-resistance variation with ana- log signal and supply voltage. The usual on-resistance temperature coefficient is 0.5%/°C (typ). 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 17V. These protection diodes are not recommended when using a single 3V supply. ______________________________________________________________Pin Description COM V- V+ NO * INTERNAL PROTECTION DIODES D2 D1 -5V +5V MAX381 MAX383 MAX385 * * * * Figure 1. Overvoltage Protection Using Two External Blocking Diodes 1, 8 COM_ Analog Switch Common Terminal 2–7, 12 N.C. Not Internally Connected 9, 16 NO_ Analog Switch Normally Open Terminal — NC_ Analog Switch Normally Closed Terminal 10, 15 IN_* Logic Level Input (Normally Low) 11 V+ Analog Signal and Logic Positive Supply Input 14 V- Analog Signal Negative Supply Input NAME FUNCTION MAX381 1, 3, 6, 8 2, 7, 12 9, 16 4, 5 10, 15 11 14 MAX383 1, 3, 6, 8 2, 7, 12 4, 5, 9, 16 — 10, 15 11 14 MAX385 PIN 13 GND Logic Negative Supply Input (Ground) 13 13 * IN1 controls COM1 and COM3; IN2 controls COM2 and COM4. |
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