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AD8614ART Datasheet(PDF) 7 Page - Analog Devices |
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AD8614ART Datasheet(HTML) 7 Page - Analog Devices |
7 / 8 page AD8614/AD8644 –7– REV. 0 The optimum values for the snubber network should be determined empirically based on the size of the capacitive load. Table I shows a few sample snubber network values for a given load capacitance. Table I. Snubber Networks for Large Capacitive Loads Load Capacitance Snubber Network (CL)(RS, CS) 0.47 nF 300 Ω, 0.1 µF 4.7 nF 30 Ω, 1 µF 47 nF 5 Ω, 1 µF Direct Access Arrangement Figure 26 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 config- ured 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’s 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 AD8644 14-lead SOIC or TSSOP package and this circuit can offer a compact solution. 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 AD8644 A3, A4 = 1/2 AD8644 R3 360 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 14.3k R10 10k R11 10k R12 10k R13 10k C2 0.1 F P2 Rx GAIN ADJUST 2k ZO 600 5V DC MIDCOM 671-8005 Figure 26. A Single-Supply Direct Access Arrangement for Modems A One-Chip Headphone/Microphone Preamplifier Solution Because of its high output current performance, the AD8644 makes an excellent amplifier for driving an audio output jack in a computer application. Figure 27 shows how the AD8644 can be interfaced with an ac codec to drive headphones or speakers U1-A R1 2k 4 C1 100 F 5V 1 10 2 3 5 5V VDD VDD LEFTOUT AD1881 (AC'97) RIGHTOUT VSS R3 20 7 8 6 9 R4 20 C2 100 F NOTE: ADDITIONAL PINS OMITTED FOR CLARITY U1-B U1 = AD8644 R2 2k 28 35 36 Figure 27. A PC-99 Compliant Headphone/Line Out Amplifier If gain is required from the output amplifier, four additional resistors should be added as shown in Figure 28. The gain of the AD8644 can be set as: A R R V = 6 5 U1-A R1 2k 4 C1 100 F 5V 1 10 2 3 5 5V VDD VDD LEFTOUT AD1881 (AC97) RIGHTOUT VSS R3 20 7 8 6 9 R4 20 C2 100 F NOTE: ADDITIONAL PINS OMITTED FOR CLARITY U1-B U1 = AD8644 R2 2k R6 20k R6 20k VREF R5 10k R5 10k AV = = +6dB WITH VALUES SHOWN R6 R5 38 35 27 36 Figure 28. A PC-99-Compliant Headphone/Speaker Amplifier with Gain Input coupling capacitors are not required for either circuit as the reference voltage is supplied from the AD1881. R4 and R5 help protect the AD8644 output in case the output jack or headphone wires are accidentally shorted to ground. The output coupling capacitors C1 and C2 block dc current from the headphones and create a high-pass filter with a corner frequency of: f CR R dB L − = + () 3 1 21 4 π Where RL is the resistance of the headphones. |
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