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OP492 Datasheet(PDF) 10 Page - Analog Devices |
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OP492 Datasheet(HTML) 10 Page - Analog Devices |
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10 / 20 page  REV. B OP292/OP492 –10– 100dV/DIV MKR: 16.9 V/ Hz 25 kHz BW: 150 Hz 0Hz MKR: 1000 Hz CH A: 800dV FS TPC 31. Voltage Noise Density APPLICATION INFORMATION Phase Reversal The OP492 has built-in protection against phase reversal when the input voltage goes to either supply rail. In fact, it is safe for the input to exceed either supply rail by up to 0.6 V with no risk of phase reversal. However, the input should not go beyond the positive supply rail by more than 0.9 V, otherwise the output will reverse phase. If this condition can occur, the problem can be fixed by adding a 5 k current limiting resistor in series with the input pin. With this addition, the input can go to more than 5 V beyond the positive rail without phase reversal. An input voltage that is as much as 5 V below the negative rail will not result in phase reversal. OP492 2K 5V OV 11.8V p-p 10 90 100 0% 1V 5µS Figure 1. Output Phase Reverse If Input Exceeds the Posi- tive Supply (V+) by More Than 0.9 V OP492 2k 5V OV 10V p-p 10 90 100 0% 1V 5µS 10 90 100 0% 1V 5µS Figure 2. No Negative Rail Phase Reversal, Even with Input Signal at 5 V Below Ground Power Supply Considerations The OP292/OP492 are designed to operate equally well at single 5 V or 15 V supplies. The lowest supply voltage recommended is 4.5 V. It is a good design practice to bypass the supply pins with a 0.1 mF ceramic capacitor. It helps improve filtering of high frequency noise. For dual supply operation, the negative supply (V–) must be applied at the same time, or before V . If V is applied before V–, or in the case of a loss of V– supply, while either input is connected to ground or other low impedance source, excessive input current may result. Potentially damaging levels of input current can de- stroy the amplifier. If this condition can exist, simply add a l k or larger resistor in series with the input to eliminate the problem. TYPICAL APPLICATIONS Direct Access Arrangement for Telephone Line Interface Figure 3 shows a 5 V- only transmit/receive telephone line inter- face for a modem circuit. It allows full duplex transmission of modem signals on a transformer-coupled 600 V line in a differential man- ner. The transmit section gain can be set for the specific modem device output. Similarly the receive amplifier gain can be appro- priately selected based on the modem device input requirements. The circuit operates on a single 5 V supply. The standard value resistors allow the use of a SIP-packaged resistor array; coupled with a quad op amp in a single package, this offers a compact, low part-count solution. 50k 5V dc 6.2V 6.2V T1 1:1 To Telephone Line 0.1 F 50k 10 F MODEM TX GAIN ADJUST RX GAIN ADJUST 0.1 F 300k 20k 20k 20k 20k 20k 20k 20k 0.1 F 20k 100pF 5k 5k 1/4 OP492 1/4 OP492 1/4 OP492 5V TRANSMIT TXA RECEIVE RXA 300k Figure 3. A Universal Direct Access Arrangement for Telephone Line Interface A Single-Supply Instrumentation Amplifier A low-cost, single-supply instrumentation amplifier can be built as shown in Figure 4. The circuit utilizes two op amps to form a high-input impedance differential amplifier. Gain can be set by selecting resistor RG which can be calculated using the transfer function equation. Normally, VREFERENCE is set to 0 V. Then the output voltage is a function of the gain times the differential input |
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