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LT1081 Datasheet(PDF) 7 Page - Linear Technology |
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LT1081 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT1080/LT1081 10801fe APPLICATIO S I FOR ATIO When driving CMOS logic from a receiver that will be used in the SHUTDOWN mode and there is no other active receiver on the line, a 51k resistor can be placed from the logic input to VCC to force a definite logic level when the receiver output is in a high impedance state. The generated driver supplies (V+ and V–) may be used to power external circuitry such as other RS232 drivers or op amps. They should be loaded with care, since excessive loading can cause the generated supply voltages to drop, causing the RS232 driver output voltages to fall below RS232 requirements. See the graph “Supply Generator Outputs” for a comparison of generated supply voltage versus supply current. 1080/81 F08 DRIVER V+ 3 EXTERNAL OP AMP LT1080 V– V+ V– 7 1 µF 1 µF – + GND 16 + TYPICAL APPLICATIO To protect against receiver input overloads in excess of ±30V, a voltage clamp can be placed on the data line and still maintain RS232 compatibility. RS232 INPUT RECEIVER LOGIC OUTPUT 1080/81 F067 5k 1k* 30V 30V * A PTC THERMISTOR WILL ALLOW CONTINUOUS OVERLOAD OF GREATER THAN ±100V Operating with 5V and 12V LOGIC INPUTS LOGIC OUTPUTS ON/OFF 18 10 13 11 12 6 5 4 2 16 9 14 8 15 7 3 17 5V INPUT 12V INPUT* –12V OUTPUT RS232 OUTPUT RS232 OUTPUT RS232 INPUT RS232 INPUT 1080/81 • TA03 5k 5k LT1080 1 µF 1 µF * PIN 1 USED ON LT1081. 1080/81 F06 RS232 INPUT ON/OFF INPUT LT1080 RECEIVER CMOS LOGIC LOGIC OUTPUT VCC 51k* * FORCES LOGIC INPUT STATE WHEN VON/OFF IS LOW |
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