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OP183 Arkusz danych(PDF) 9 Page - Analog Devices |
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OP183 Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 12 page REV.B OP183/OP283 APPLICATIONS OP183 Offset Adjust Figure 36 shows how the OP183’s offset voltage can be adjusted by connecting a potentiometer between Pins 1 and 5, and connecting the wiper to V EE. The recommended value for the potentiometer is 10 k Ω. This will give an adjustment range of approximately ±1 mV. If larger adjustment span is desired, a 50 k Ω potentiometer will yield a range of ±2.5 mV. Figure 37. Direct Access Arrangement +5 Volt Only Stereo DAC for Multimedia The OP283’s low noise and single supply capability are ideally suited for stereo DAC audio reproduction or sound synthesis applications such as multimedia systems. Figure 38 shows an 18-bit stereo DAC output setup that is powered from a single +5 volt supply. The low noise preserves the 18-bit dynamic range of the AD1868. For DACs that operate on dual supplies, the OP283 can also be powered from the same supplies. Figure 38. +5 Volt Only 18-Bit Stereo DAC Low Voltage Headphone Amplifiers Figure 39 shows a stereo headphone output amplifier for the AD1849 16-bit SoundPort® Stereo Codec device. The pseudo- reference voltage is derived from the common-mode voltage generated internally by the AD1849, thus providing a convenient bias for the headphone output amplifiers. 1 7 6 5 4 3 2 VOS VCC VEE OP183 Figure 36. OP183 Offset Adjust Phase Reversal The OP183 family is protected against phase reversal as long as both of the inputs are within the range of the positive supply and the negative supply minus 0.6 volts. However if there is a possibility of either input going beyond these limits, then the inputs should be protected with a series resistor to limit input current to 2 mA. Direct Access Arrangement The OP183/OP283 can be used in a single supply Direct Access Arrangement (DAA) as is shown in Figure 37. This figure shows a portion of a typical DAA capable of operating from a single +5 volt supply and it should also work on +3 volt supplies with minor modifications. Amplifiers A2 and 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 that the drive to the transformer is effectively doubled over a single amplifier arrangement. This application takes advantage of the OP183/283’s ability to drive capacitive loads, and to save power in single supply applications. Figure 39. Headphone Output Amplifier for Multimedia Sound Codec Ω20kΩ Ω20kΩ Ω3.3kΩ Ω22.1kΩ Ω20kΩ Ω20kΩ OP283 OP283 OP283 750pF Ω475Ω 0.33µF 0.1µF 2.5VREF 0.0047µF 0.1µF Ω20kΩ Ω37.4kΩ 300pF A1 A2 A3 RXA TXA SoundPort is a registered trademark of Analog Devices Inc. 1/2 OP283 +5V 1/2 OP283 Ω5kΩ OPTIONAL GAIN Ω1kΩ V REF 1/2 OP283 +5V V REF ΩOPTIONAL GAIN 1k Ω Ω5kΩ 29 19 31 Ω10kΩ 10µF LOUT1L LOUT1R CMOUT AD1849 V REF 10µF Ω10kΩ L VOLUME CONTROL R VOLUME CONTROL Ω16Ω 220µF Ω47kΩ HEADPHONE LEFT Ω16Ω 220µF Ω47kΩ HEADPHONE RIGHT Ω47kΩ Ω47kΩ 8 1 4 3 2 1/2 OP283 Ω7.68k Ω Ω9.76kΩ 330pF 100pF Ω7.68kΩ 7 5 6 1/2 OP283 Ω7.68kΩ Ω9.76kΩ 330pF 100pF Ω7.68kΩ LEFT CHANNEL OUTPUT RIGHT CHANNEL OUTPUT 220µF 220µF 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 AD1868 VL LL DL CK DR LR DGND VBR VBL VOL AGND VOR VS +5V SUPPLY 18-BIT SERIAL REG. 18-BIT SERIAL REG. VREF 18-BIT DAC 18-BIT DAC VREF –9– |
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