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OP295GSZ Datasheet(PDF) 10 Page - Analog Devices |
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OP295GSZ Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page OP295/OP495 Rev. E | Page 10 of 16 Finally, the potentiometer, R8, is needed to adjust the offset voltage to null it to zero. Similar performance can be obtained using an OP90 as the output amplifier with a savings of about 185 μA of supply current. However, the output swing does not include the positive rail, and the bandwidth reduces to approxi- mately 250 Hz. Table 6. Single-Supply Low Noise Preamp Performance IC = 1.85 mA IC = 0.5 mA R1 270 Ω 1.0 kΩ R3, R4 200 Ω 910 Ω en @ 100 Hz 3.15 nV/√Hz 8.6 nV/√Hz en @ 10 Hz 4.2 nV/√Hz 10.2 nV/√Hz ISY 4.0 mA 1.3 mA IB 11 μA 3 μA Bandwidth 1 kHz 1 kHz Closed-Loop Gain 1000 1000 DRIVING HEAVY LOADS The OP295/OP495 are well suited to drive loads by using a power transistor, Darlington, or FET to increase the current to the load. The ability to swing to either rail can assure that the device is turned on hard. This results in more power to the load and an increase in efficiency over using standard op amps with their limited output swing. Driving power FETs is also possible with the OP295/OP495 because of their ability to drive capaci- tive loads of several hundred picofarads without oscillating. Without the addition of external transistors, the OP295/OP495 can drive loads in excess of ±15 mA with ±15 V or +30 V supplies. This drive capability is somewhat decreased at lower supply voltages. At ±5 V supplies, the drive current is ±11 mA. Driving motors or actuators in two directions in a single-supply application is often accomplished using an H bridge. The principle is demonstrated in Figure 20. From a single 5 V supply, this driver is capable of driving loads from 0.8 V to 4.2 V in both directions. Figure 21 shows the voltages at the inverting and noninverting outputs of the driver. There is a small crossover glitch that is frequency-dependent; it does not cause problems unless used in low distortion applications, such as audio. If this is used to drive inductive loads, diode clamps should be added to protect the bridge from inductive kickback. 10kΩ 1.67V 2N2222 2N2222 OUTPUTS 2N2907 2N2907 5V 10kΩ 10kΩ 0 ≤ VIN ≤ 2.5V 5kΩ – + – + Figure 20. H Bridge 10 90 100 0% 2V 2V 1ms Figure 21. H Bridge Outputs DIRECT ACCESS ARRANGEMENT The OP295/OP495 can be used in a single-supply direct access arrangement (DAA), as shown in Figure 22. This figure shows a portion of a typical DM capable of operating from a single 5 V supply, and it may also work on 3 V supplies with minor modi- fications. Amplifier A2 and Amplifier A3 are configured so that the transmit signal, TxA, is inverted by A2 and is not inverted by A3. This arrangement drives the transformer differentially so the drive to the transformer is effectively doubled over a single amplifier arrangement. This application takes advantage of the ability of the OP295/OP495 to drive capacitive loads and to save power in single-supply applications. – + 2.5V REF A3 750pF A1 37.4kΩ 390pF RxA TxA A2 3.3kΩ 20kΩ 475Ω 22.1kΩ 20kΩ 20kΩ 20kΩ 20kΩ 0.033µF 1:1 – + 0.0047µF OP295/ OP495 OP295/ OP495 OP295/ OP495 0.1µF 0.1µF Figure 22. Direct Access Arrangement SINGLE-SUPPLY INSTRUMENTATION AMPLIFIER The OP295/OP495 can be configured as a single-supply instrumentation amplifier, as shown in Figure 23. For this example, VREF is set equal to V+/2, and VO is measured with respect to VREF. The input common-mode voltage range includes ground, and the output swings to both rails. |
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