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SA5230N датащи(PDF) 9 Page - NXP Semiconductors |
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SA5230N датащи(HTML) 9 Page - NXP Semiconductors |
9 / 17 page Philips Semiconductors Product specification NE/SA5230 Low voltage operational amplifier 1994 Aug 31 9 V+ V– + – NE5230 OTHER PARTS V+ V– V+ V– V+ V– SL00254 Figure 5. In a Non-Inverting Voltage-Follower Configuration, the NE5230 will Give Full Rail-to-Rail Swing. Other Low Voltage Amplifiers will not Because they are Limited by their Input Common-Mode Range and Output Swing Capability. There are not as many considerations when designing with the NE5230 as with other devices. Since the NE5230 is internally-compensated and has a unity gain-bandwidth of 600kHz, board layout is not so stringent as for very high frequency devices such as the NE5205. The output capability of the NE5230 allows it to drive relatively high capacitive loads and small resistive loads. The power supply pins should be decoupled with a low-pass RC network as close to the supply pins as possible to eliminate 60Hz and other external power line noise, although the power supply rejection ratio (PSRR) for the part is very high. The pinout for the NE5230 is the same as the standard single op amp pinout with the exception of the bias current adjusting pin. REMOTE TRANSDUCER WITH CURRENT TRANSMISSION There are many ways to transmit information along two wires, but current transmission is the most beneficial when the sensing of remote signals is the aim. It is further enhanced in the form of 4 to 20mA information which is used in many control-type systems. This method of transmission provides immunity from line voltage drops, large load resistance variations, and voltage noise pickup. The zero reference of 4mA not only can show if there is a break in the line when no current is flowing, but also can power the transducer at the remote location. Usually the transducer itself is not equipped to provide for the current transmission. The unique features of the NE5230 can provide high output current capability coupled with low power consumption. It can be remotely connected to the transducer to create a current loop with minimal external components. The circuit for this is shown in Figure 6. Here, the part is configured as a voltage-to-current, or transconductance amplifier. This is a novel circuit that takes advantage of the NE5230’s large open-loop gain. In AC applications, the load current will decrease as the open-loop gain rolls off in magnitude. The low offset voltage and current sinking capabilities of the NE5230 must also be considered in this application. a. The NE5230 as a Remote Transducer Transconductance Amp With 4-20mA Current Transmission Output Capability b. The Same Type of Circuit as Figure 5a, but for Sourcing Current to the Load T R A N S D U C E R V REMOTE POWER SUPPLY NE5230 VCC VEE VIN IOUT 3 2 4 5 6 7 + – RC RL + – NOTES: 1. IOUT = VIN/RC 2. RL MAX ≈ V REMOTE * 1.8V * V INMAX I OUT For RC = 1Ω I OUT 4mA 20mA V IN 4mV 20mV VCC NE5230 3 2 4 5 6 7 + – VEE + IOUT + – VIN RC RL VCC + – SL00255 Figure 6. |
Аналогичный номер детали - SA5230N |
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Аналогичное описание - SA5230N |
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