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ADM3251E Datasheet(PDF) 8 Page - Analog Devices |
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ADM3251E Datasheet(HTML) 8 Page - Analog Devices |
8 / 16 page ADM3251E Rev. 0 | Page 8 of 16 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS NC 1 VCC 2 VCC 3 GND 4 VISO 20 V+ 19 C1+ 18 C1– 17 GND 5 TOUT 16 GND 6 RIN 15 GND 7 C2+ 14 ROUT 8 C2– 13 TIN 9 V– 12 GND 10 GNDISO 11 NC = NO CONNECT ADM3251E TOP VIEW (Not to Scale) Figure 2. Pin Configuration Table 8. Pin Function Descriptions Pin No. Mnemonic Description 1 NC No Connect. This pin should always remain unconnected. 2, 3 VCC Power Supply Input. A 0.1 μF decoupling capacitor is required between VCC and ground. When a voltage between 4.5 V and 5.5 V is applied to the VCC pin, the integrated dc-to-dc converter is enabled. If this voltage is lowered to between 3.0 V and 3.7 V, the integrated dc-to-dc converter is disabled. 4, 5, 6, 7, 10 GND Ground Pin. 8 ROUT Receiver Output. This pin outputs CMOS logic levels. 9 TIN Transmitter (Driver) Input. This pin accepts TTL/CMOS levels. 11 GNDISO Ground Reference for Isolator Primary Side. 12 V− Internally Generated Negative Supply. 13, 14 C2−, C2+ Positive and Negative Connections for Charge Pump Capacitors. External Capacitor C2 is connected between these pins; a 0.1 μF capacitor is recommended, but larger capacitors up to 10 μF can be used. 15 RIN Receiver Input. This input accepts RS-232 signal levels. 16 TOUT Transmitter (Driver) Output. This outputs RS-232 signal levels. 17, 18 C1−, C1+ Positive and Negative Connections for Charge Pump Capacitors. External Capacitor C1 is connected between these pins; a 0.1 μF capacitor is recommended, but larger capacitors up to 10 μF can be used. 19 V+ Internally Generated Positive Supply. 20 VISO Isolated Supply Voltage for Isolator Secondary Side. A 0.1 μF decoupling capacitor is required between VISO and ground. When the integrated dc-to-dc converter is enabled, the VISO pin should not be used to power external circuitry. If the integrated dc-to-dc converter is disabled, power the secondary side by applying a voltage in the range of 3.0 V to 5.5 V to this pin. |
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