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DG417CJ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DG417CJ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page __________Applications Information Operation with Supply Voltages Other than ±15V Using supply voltages other than ±15V reduces the analog signal range. The DG417/DG418/DG419 switch- es operate with ±4.5V to ±20V bipolar supplies or with a +10V to +30V single supply; connect V- to 0V when operating with a single supply. Also, all device types can operate with unbalanced supplies, such as +24V and -5V. VL must be connected to +5V to be TTL com- patible, or to V+ for CMOS-logic level inputs. The Typical Operating Characteristics graphs show typical on-resistance with ±20V, ±15V, ±10V, and ±5V sup- plies. (Switching times increase by a factor of two or more for operation at ±5V.) 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 may cause permanent damage to the devices. Always sequence V+ on first, followed by VL, V-, and logic inputs. If power-supply sequencing is not possi- ble, add two small, external signal diodes in series with the supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog signal range to 1V below V+ and 1V above V-, without affecting low switch resistance and low leakage characteristics. Device operation is unchanged, and the difference between V+ and V- should not exceed +44V. Improved, SPST/SPDT Analog Switches 6 _______________________________________________________________________________________ ______________________________________________________________Pin Description FUNCTION DG417 DG418 1 — Analog-Switch Source Terminal (normally closed) PIN — 1 Analog-Switch Source Terminal (normally open) 2 2 No Internal Connection 6 6 Logic-Level Input 5 5 Logic-Level Positive Supply Input 4 4 Analog-Signal Positive Supply Input 3 3 Logic Ground 7 7 Analog-Signal Negative Supply Input V+ D V- S Vg DG41_ Figure 1. Overvoltage Protection Using External Blocking Diodes NAME DG419 — S — S — N.C. 6 IN 5 VL 4 V+ 3 GND 7 V- 8 8 Analog-Switch Drain Terminal 1 D — — Analog-Switch Source Terminal 1 (normally closed) 2 S1 — — Analog-Switch Source Terminal 2 (normally open) 8 S2 |
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