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OP179 データシート(PDF) 10 Page - Analog Devices |
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OP179 データシート(HTML) 10 Page - Analog Devices |
10 / 16 page OP179/OP279 –10– REV. G 6.2V 6.2V TRANSMIT TXA RECEIVE RXA C1 0.1 F R1 10k R2 9.09k 2k P1 TX GAIN ADJUST A1 A2 A3 A4 A1, A2 = 1/2 OP279 A3, A4 = 1/2 OP279 R3 55 R4 55 1:1 T1 TO TELEPHONE LINE 1 2 3 7 6 5 2 3 1 6 5 7 10 F R7 10k R8 10k R5 10k R6 10k R9 10k R14 9.09k R10 10k R11 10k R12 10k R13 10k C2 0.1 F P2 RX GAIN ADJUST 2k ZO 110 5V DC Figure 10. A Single-Supply Direct Access Arrangement for Modems A Single-Supply, Remote Strain Gage Signal Conditioner The circuit in Figure 11 illustrates a way by which the OP179/ OP279 can be used in a 12 V single supply, 350 Ω strain gage signal conditioning circuit. In this circuit, the OP179/OP279 serves two functions: (1) By servoing the output of the REF43’s 2.5 V output across R1, it provides a 20 mA drive to the 350 Ω strain gage. In this way, small changes in the strain gage pro- duce large differential output voltages across the AMP04’s inputs. (2) To maximize the circuit’s dynamic range, the other half of the OP179/OP279 is configured as a supply-splitter connected to the AMP04’s REF terminal. Thus, tension or compression in the application can be measured by the circuit. REF43 AMP04 0.1 F 2 6 4 2.5V 3 1 8 4 2 A1 7 1 8 6 3 2 4 CX C2 0.1 F R4 1k 12V 5 VO 80mV/ VO COMMON R1 124 0.1%, LOW TCR 100-ft TWISTED PAIR BELDEN TYPE 9502 S+ S– 350 STRAIN GAGE F– F+ A2 12V R2 10k R3 10k C1 10 F 7 6 5 +6V A1, A2 = 1/2 OP279 12V 20mA DRIVE Figure 11. A Single-Supply, Remote Strain Gage Signal Conditioner The AMP04 is configured for a gain of 100, producing a circuit sensitivity of 80 mV/ Ω. Capacitor C2 is used across the AMP04’s Pins 8 and 6 to provide a 16-Hz noise filter. If additional noise filtering is required, an optional capacitor, CX, can be used across the AMP04’s input to provide differential-mode noise rejection. A Single-Supply, Balanced Line Driver The circuit in Figure 12 is a unique line driver circuit topology used in professional audio applications and has been modified for automotive audio applications. On a single 12 V supply, the line driver exhibits less than 0.02% distortion into a 600 Ω load across the entire audio band (not shown). For loads greater than 600 Ω, distortion performance improves to where the circuit exhibits less than 0.002%. The design is a transformerless, balanced transmission system where output common-mode rejection of noise is of paramount importance. Like the transformer-based system, either output can be shorted to ground for unbalanced line driver applications without changing the circuit gain of 1. Other circuit gains can be set according to the equation in the diagram. This allows the design to be easily configured for noninverting, inverting, or differential operation. RL 600 C1 22 F A2 7 6 5 3 1 2 A1 12V R1 10k R2 10k R11 10k R7 10k 6 7 5 A1 12V 12V R8 100k R9 100k C2 1 F R12 10k R14 50 A2 1 2 3 R3 10k R6 10k R13 10k C3 47 F VO1 VO2 C4 47 F A1, A2 = 1/2 OP279 GAIN = R3 R2 SET: R7, R10, R11 = R2 SET: R6, R12, R13 = R3 VIN R5 50 Figure 12. A Single-Supply, Balanced Line Driver for Automotive Applications |
同様の部品番号 - OP179 |
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同様の説明 - OP179 |
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