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AD8517 Datasheet(PDF) 11 Page - Analog Devices |
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AD8517 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page AD8517/AD8527 –11– REV. B Table III. Snubber Network Values for Large Capacitive Loads CLOAD Rx Cx 680 pF 300 Ω 3 nF 1 nF 100 Ω 10 nF 10 nF 400 Ω 30 nF TOTAL HARMONIC DISTORTION + NOISE The AD85x7 family offers a low total harmonic distortion, which makes this amplifier ideal for audio applications. Figure 26 shows a graph of THD + N, for a VS > 3 V the THD + N is about 0.001% and 0.03% for VS ≥ 1.8 V in a noninverting configuration with a gain of 1. In an inverting configuration, the noise is 0.003% for all VSY. FREQUENCY – Hz 0.01 0.0001 10 20k 0.001 0.1 1 100 1k 10k VS > 3V TO 5V VS = 1.8V AV = +2 Figure 26. THD + N vs. Frequency Graph A MICROPOWER REFERENCE VOLTAGE GENERATOR Many single supply circuits are configured with the circuit-biased to one-half of the supply voltage. In these cases, a false-ground reference can be created by using a voltage divider buffered by an amplifier. Figure 27 shows the schematic for such a circuit. The two 1 M Ω resistors generate the reference voltages while drawing only 0.9 µA of current from a 1.8 V supply. A capacitor connected from the inverting terminal to the output of the op amp provides compensation to allow for a bypass capacitor to be connected at the reference output. This bypass capacitor helps establish an ac ground for the reference output. AD8517 10k 0.022 F VREF 0.9V TO 2.5V 1 F 1 F 1M 1.8V TO 5V 100 1M Figure 27. A Micropower Reference Voltage Generator MICROPHONE PREAMPLIFIER The AD8517 is ideal to use as a microphone preamplifier. Figure 28 shows this implementation. R3 220k VCC VREF C1 0.1 F VCC R1 2.2k ELECTRET MIC VOUT AD8517 VIN R2 22k |AV| = R3 R2 Figure 28. A Microphone Preamplifier R1 is used to bias an electret microphone and C1 blocks dc voltage from the amplifier. The magnitude of the gain of the amplifier is approximately R3/R2 when R2 ≥ 10 × R1. VREF should be equal to 1/2 1.8 V for maximum voltage swing. Direct Access Arrangement for Telephone Line Interface Figure 28 illustrates a 1.8 V transmit/receive telephone line interface for 600 Ω transmission systems. It allows full duplex transmission of signals on a transformer-coupled 600 Ω line in a differential manner. Amplifier A1 provides gain that can be ad- justed to meet the modem output drive requirements. Both A1 and A2 are configured to apply the largest possible signal on a single supply to the transformer. Amplifier A3 is configured as a difference amplifier for two reasons: (1) It prevents the transmit signal from interfering with the receive signal and (2) it extracts the receive signal from the transmission line for amplification by A4. A4’s gain 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 AD8517/AD8527’s 5-lead SOT-23, 8-lead MSOP, and 8-lead SOIC footprint and this circuit offers 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 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 +1.8V DC MIDCOM 671-8005 A2 A3 A4 1/2 AD8517 1/2 AD8517 1/2 AD8527 1/2 AD8527 Figure 29. A Single-Supply Direct Access Arrangement for Modems |
Similar Part No. - AD8517_15 |
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Similar Description - AD8517_15 |
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