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ADM3202ARW 数据表(PDF) 6 Page - Analog Devices |
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ADM3202ARW 数据表(HTML) 6 Page - Analog Devices |
6 / 8 page ADM3202/ADM3222/ADM1385 –6– REV. A GENERAL DESCRIPTION The ADM3202/ADM3222/ADM1385 are RS-232 line drivers/ receivers. Step-up voltage converters coupled with level shifting transmitters and receivers allow RS-232 levels to be developed while operating from a single +3.3 V supply. CMOS technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. The ADM3202/ADM3222/ADM1385 is a modification, en- hancement and improvement to the AD230–AD241 family and its derivatives. It is essentially plug-in compatible and does not have materially different applications. CIRCUIT DESCRIPTION The internal circuitry consists of three main sections. These are: 1. A charge pump voltage converter 2. 3.3 V logic to EIA-232 transmitters 3. EIA-232 to 5 V logic receivers. Charge Pump DC-DC Voltage Converter The charge pump voltage converter consists of a 200 kHz oscil- lator and a switching matrix. The converter generates a ±6.6 V supply from the input +3.3 V level. This is done in two stages using a switched capacitor technique as illustrated below. First, the +3.3 V input supply is doubled to +6.6 V using capacitor C1 as the charge storage element. The +6.6 V level is then inverted to generate –6.6 V using C2 as the storage element. C3 is shown connected between V+ and VCC, but is equally effec- tive if connected between V+ and GND. Capacitors C3 and C4 are used to reduce the output ripple. Their values are not critical and can be increased if desired. Capacitor C3 is shown connected between V+ and VCC. It is also acceptable to connect this capacitor between V+ and GND. If desired, larger capacitors (up to 10 µF) can be used for capacitors C1–C4. +3.3V TO +6.6V VOLTAGE DOUBLER C1+ C1– C5 0.1 F + VCC V+ 0.1 F 10V + + C3 0.1 F 6.3V +3.3V INPUT +6.6V TO –6.6V VOLTAGE INVERTER C2+ C2– + V– 0.1 F 10V + C4 0.1 F 10V T1OUT T1IN T2OUT T2IN EIA/TIA-232 OUTPUTS R1OUT R2OUT R1IN R2IN EIA/TIA-232 INPUTS* CMOS INPUTS CMOS OUTPUTS ADM3202 GND *INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT +3.3V TO +6.6V VOLTAGE DOUBLER C1+ C1– C5 0.1 F + VCC V+ 0.1 F 10V + + C3 0.1 F 6.3V +3.3V INPUT +6.6V TO –6.6V VOLTAGE INVERTER C2+ C2– + V– 0.1 F 10V + C4 0.1 F 10V T1OUT T1IN T2OUT T2IN EIA/TIA-232 OUTPUTS R1OUT R2OUT R1IN R2IN EIA/TIA-232 INPUTS* CMOS INPUTS CMOS OUTPUTS ADM3222 GND *INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT T1 T2 R2 R1 T1 T2 R2 R1 EN SD +3.3V TO +6.6V VOLTAGE DOUBLER C1+ C1– C5 0.1 F + VCC V+ 0.1 F 10V + C3 0.1 F 6.3V +3.3V INPUT +6.6V TO –6.6V VOLTAGE INVERTER C2+ C2– + V– 0.1 F 10V + C4 0.1 F 10V T1OUT T1IN T2OUT T2IN EIA/TIA-232 OUTPUTS R1OUT R2OUT R1IN R2IN EIA/TIA-232 INPUTS* CMOS INPUTS CMOS OUTPUTS ADM1385 GND *INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT T1 T2 R2 R1 DD SD + Figure 8. Typical Operating Circuits 1 s/DIV T1IN 2V/DIV T1OUT 5V/DIV Figure 7. 230 kbps Data Transmission |
类似零件编号 - ADM3202ARW |
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类似说明 - ADM3202ARW |
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