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AD8594ARU 数据表(PDF) 11 Page - Analog Devices |
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AD8594ARU 数据表(HTML) 11 Page - Analog Devices |
11 / 15 page AD8591/AD8592/AD8594 –11– REV. A The U1-A amplifier is configured as a unity gain buffer driving a 1 nF capacitor. The input signal is connected to the noninverting input, while the sample clock controls the shutdown for that amplifier. When the sample clock is high, the U1-A amplifier is active and the output follows VIN. Once the sample clock goes low, U1-A shuts down with the output of the amplifier going to a high impedance state, holding the voltage on the C1 capacitor. The U1-B amplifier is used as a unity gain buffer to prevent load- ing on C1. Because of the low input bias current of the U1-B CMOS input stage and the high impedance state of the U1-A output in shutdown, there is very little voltage droop from C1 during the Hold period. This circuit can be used with sample frequencies as high as 500 kHz and as low as below 1 Hz. Even lower voltage droop can be achieved for very low sample rates by increasing the value of C1. Direct Access Arrangement for PCMCIA Modems (Telephone Line Interface) Figure 38 illustrates a +5 V transmit/receive telephone line interface for 600 Ω 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 adjusted 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. Because of the AD8594’s high output current drive and low dropout voltages, the largest signal avail- able on a single +5 V supply is approximately 4.5 V p-p into a 600 Ω transmission system. 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. Amplifier 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 AD8594 16-lead TSSOP or SOIC footprint, and this circuit offers a compact, cost effective solution. R7 10k R8 10k +5V 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 AD8592 A3, A4 = 1/2 AD8592 R3 360 1:1 T1 TO TELEPHONE LINE 1 2 3 9 8 7 2 3 1 8 7 9 10 F 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 MIDCOM 671-8005 SHUTDOWN 6 5 6 5 Figure 38. A Single Supply Direct Access Arrangement for PCMCIA Modems Single Supply Differential Line Driver Figure 39 shows a single supply differential line driver circuit that can drive a 600 Ω load with less than 0.7% distortion from 20 Hz to 15 kHz with an input signal of 4 V p-p and a single +5 V supply. The design uses an AD8594 to mimic the performance of a fully balanced transformer based solution. However, this design occu- pies much less board space while maintaining low distortion and can operate down to dc. Like the transformer based design, either output can be shorted to ground for unbalanced line driver applica- tions without changing the circuit gain of 1. RL 600 C1 22 F A2 9 8 7 3 1 2 A1 +5V R1 10k R2 10k R11 10k R7 10k 8 7 7 A1 +5V +5V 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 AD8592 GAIN = R3 R2 SET: R7, R10, R11 = R2 SET: R6, R12, R13 = R3 VIN R10 10k R5 50 10 4 10 4 9 Figure 39. A Low Noise, Single Supply Differential Line Driver R8 and R9 set up the common-mode output voltage equal to half of the supply voltage. C1 is used to couple the input signal and can be omitted if the input’s dc voltage is equal to half of the supply voltage. The circuit can also be configured to provide additional gain if desired. The gain of the circuit is: A V V R R V OUT IN == 3 2 (7) Where: VOUT = VO1 – VO2, R2 = R7 = R10 = R11 and, R3 = R6 = R12 = R13 |
类似零件编号 - AD8594ARU |
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类似说明 - AD8594ARU |
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