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OP162GSZ Folha de dados(PDF) 17 Page - Analog Devices |
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OP162GSZ Folha de dados(HTML) 17 Page - Analog Devices |
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17 / 20 page ![]() Data Sheet OP162/OP262/OP462 Rev. H | Page 17 of 20 Figure 45. Positive Slope Settling Time Figure 46. Negative Slope Settling Time DIRECT ACCESS ARRANGEMENT Figure 47 shows a schematic for a 5 V single-supply transmit/ receive telephone line interface for 600 Ω transmission systems. It allows full-duplex transmission of signals on a transformer- coupled 600 Ω line. Amplifier A1 provides gain that can be adjusted to meet the modem output drive requirements. Both A1 and A2 are configured to apply the largest possible differential signal to the transformer. The largest signal available on a single 5 V supply is approximately 4.0 V p-p into a 600 Ω transmission system. Amplifier A3 is configured as a difference amplifier to extract the receive information from the transmission line for amplification by A4. A3 also prevents the transmit signal from interfering with the receive signal. The gain of A4 can be adjusted in the same manner as A1 to meet the modem’s input signal requirements. Standard resistor values permit the use of SIP (single in-line package) format resistor arrays. Couple this with the OP462 14-lead SOIC or TSSOP package and this circuit offers a compact solution. Figure 47. Single-Supply Direct Access Arrangement for Modems 10 0% 100 90 1µs 5mV 2V 10 0% 100 90 10 0% 100 90 1µs 2V 5mV 6.2V 6.2V TRANSMIT TXA RECEIVE RXA 2k P1 TX GAIN ADJUST A1 A2 A3 A4 A1, A2 = 1/2 AD8532 A3, A4 = 1/2 AD8532 R3 360 Ω ZO 600 Ω R1 10k Ω R13 10k Ω R10 10k Ω R9 10k Ω R11 10k Ω C2 0.1 µF C1 0.1 µF 10 µF R12 10k Ω R7 10k Ω R8 10k Ω R5 10k Ω R6 10k Ω R14 14.3k Ω R2 9.09k Ω 1:1 T1 TO TELEPHONE LINE 1 2 3 7 6 5 2 3 1 6 5 7 P2 RX GAIN ADJUST 2k Ω 5V DC MIDCOM 671-8005 |
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