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MAX4507EWN Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX4507EWN Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page Fault-Protected, High-Voltage Signal-Line Protectors _______________________________________________________________________________________ 9 Protectors as Circuit Elements Each of the protectors in a MAX4506/MAX4507 may be used as a switched resistor, independent of the func- tions of other elements in the same package. For exam- ple, Figure 4 shows a MAX4506 with two of the protectors used to protect the input of an op amp, and the third element used to sequence a power supply. Combining the circuits of Figures 3 and 4 produces a delayed action on the switched +15V, as well as smooth application of signals to the amplifier input. Figure 5 shows MAX4506 used in front of a MAX338 unprotected 1-to-8 multiplexer. With supplies at ±15V, VOUT of the MAX4506 clamps to ±15V; VOUT of the MAX338 goes to ±14V. With supplies off, VOUT goes to 0V while the inputs remain at ±25V. Use the MAX4506 with a MAX338 to enhance voltage handling capability (Figure 6). The MAX4506 and MAX338 share almost equal voltage drops in this con- figuration. For example, applying ±40V on pins 1 and 2 of the MAX4506 causes a voltage drop of about 26V across pin 1 of the MAX4506 to pin 4 of the MAX338, and a voltage drop of about 28V across pin 4 of the MAX4506 to pin 8 of the MAX338. Similarly, there is a 26V drop from pin 2 of the MAX4506 to pin 5 of the MAX338. The system’s performance exceeds each individual part’s specification because of shared volt- age drops. Multiplexer and Demultiplexer As shown in Figure 7, the MAX4506 can be used in series with the output of a MAX4508 (1-to-8 multiplexer) to act as multiplexer or demultiplexer. The MAX4508 is a fault-protected multiplexer whose inputs are designed to interface with harsh environments; however, its common output is not fault protected if connected to outside sig- nals (i.e., demultiplexer use). If the common output can see fault signals, then it needs to be protected, and the MAX4506 can be added to provide complete protection. SWITCHED +15V MAX4506 IN3 V- -15V V+ +15V 3 4 5 OUT3 IN2 26 OUT2 IN1 17 OUT1 8 P 100k OP AMP 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 MAX338 -15V 1 2 8 7 +15V RL -25V +25V 3 4 6 5 MAX4506 A1 A2 GND V+ NO5 NO6 NO7 NO9 AO EN V- OV +5V +3V +15V -5V NO3 NO1 NO2 NO4 VOUT Figure 4. Power-Supply Sequencing 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 MAX4508 -15V 1 2 8 7 +15V NEW COM 3 4 6 5 MAX4506 A1 A2 GND V+ NO5 NO6 NO7 NO9 AO EN V- O +5V +3V +15V -15V NO3 NO1 NO2 NO4 COM Figure 7. Multiplexer and Demultiplexer Application Using MAX4506 (or MAX4507) with MAX4508 VOUT = -14V +40V -40V 10k 6 4 7 1 5 2 8 MAX338 MAX4506 Figure 6. SPDT Switch Application Figure 5. Protecting a MAX338 with a MAX4506 |
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