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ADM222AN 数据表(PDF) 4 Page - Analog Devices |
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ADM222AN 数据表(HTML) 4 Page - Analog Devices |
4 / 9 page ADM222/ADM232A/ADM242 REV. 0 –4– PIN FUNCTION DESCRIPTION Mnemonic Function V CC Power Supply Input, +5 V ± 10%. V+ Internally generated positive supply (+10 V nominal). V– Internally generated negative supply (–10 V nominal). GND Ground Pin. Must be connected to 0 V. C1+ External capacitor 1, (+ terminal) is connected to this pin. C1– External capacitor 1, (– terminal) is connected to this pin. C2+ External capacitor 2, (+ terminal) is connected to this pin. C2– External capacitor 2, (– terminal) is connected to this pin. T IN Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 k Ω pull-up resistor to V CC is connected on each input. T OUT Transmitter (Driver) Outputs. These are RS-232 levels (typically ±9 V). R IN Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 k Ω pull-down resistor to GND is connected on each of these inputs. R OUT Receiver Outputs. These are TTL/CMOS levels. NC No Connect. No connections are required to this pin. EN (ADM242 Only) Active Low Digital Input. May be used to enable or disable (three-state) both receiver outputs. SHDN (ADM222 & ADM242) Active Low Digital Input. May be used to disable the device so that the power consumption is minimized. On the ADM222 all drivers and receivers are disabled. On the ADM242 the drivers are disabled but the receivers remain enabled. Figure 8. ADM222 DIP & SOIC Pin Configurations Figure 7. ADM222 Typical Operating Circuit Figure 5. Shutdown Test Circuit tDT + 5V TRANSMITTER OUTPUT SHDN INPUT – 5V V+ 0V 3V V– Figure 6. Transmitter Shutdown Disable Timing NC = NO CONNECT NC C1+ VCC C2+ C2– V– R1OUT T1IN V+ C1– GND T2OUT T2IN R2IN R2OUT R1IN T1OUT 1 2 18 17 5 6 7 14 13 12 3 4 16 15 8 11 9 10 TOP VIEW (Not to Scale) ADM222 SHDN VIN VOUT 50pF 3k Ω SHDN * INTERNAL 400k Ω PULL-UP RESISTOR ON EACH TTL/MOS INPUT ** INTERNAL 5k Ω PULL-DOWN RESISTOR ON EACH RS-232 INPUT VCC +5V TO +10V VOLTAGE DOUBLER +5V TO –10V VOLTAGE INVERTER C1+ C1– V+ V– C2+ C2– T1 ADM222 T2 R1 R2 C1 0.1µF C2 0.1µF C3 0.1µF GND TTL/CMOS OUTPUTS R1OUT R2OUT T1OUT T2OUT R1IN R2IN T1IN T2IN TTL/CMOS INPUTS * RS-232 OUTPUTS RS-232 INPUTS ** 2 4 6 5 12 11 13 10 3 7 15 8 14 9 C4 0.1µF +5V INPUT C5 0.1µF 6.3V 17 16 18 SHDN |
类似零件编号 - ADM222AN |
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类似说明 - ADM222AN |
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