전자부품 데이터시트 검색엔진 |
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OP213FP 데이터시트(PDF) 7 Page - Analog Devices |
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OP213FP 데이터시트(HTML) 7 Page - Analog Devices |
7 / 16 page OP113/OP213/OP413 REV. C –7– Supply Splitter Circuit The OP113 family has excellent frequency response characteris- tic that makes it an ideal pseudo-ground reference generator as shown in Figure 6. The OP113 family serves as a voltage fol- lower buffer. In addition, it drives a large capacitor that serves as a charge reservoir to minimize transient load changes, as well as a low impedance output device at high frequencies. The circuit easily supplies 25 mA load current with good settling characteristics. 8 1 4 3 2 1/2 OP113 R3 2.5k C1 0.1 F R4 100 C2 1 F R1 5k R2 5k VS+ = +5V +12V VS+ 2 OUTPUT + Figure 6. False Ground Generator SoundPort is a registered trademark of Analog Devices, Inc. Low Noise Voltage Reference Few reference devices combine low noise and high output drive capabilities. Figure 7 shows the OP113 family used as a two- pole active filter that band limits the noise of the 2.500 V refer- ence. Total noise measures 3 µV p-p. 8 1 4 3 2 1/2 OP113 10 F C2 10 F +5V – + OUTPUT +2.500V 3 V p-p NOISE + 10k 10k 6 2 +5V IN OUT 4 GND REF43 Figure 7. Low Noise Voltage Reference +5 V Only Stereo DAC for Multimedia The OP113 family’s low noise and single supply capability are ideally suited for stereo DAC audio reproduction or sound synthesis applications such as multimedia systems. Figure 8 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 OP113 family can also be powered from the same supplies. 18-BIT DAC 18-BIT SERIAL REG. 18-BIT SERIAL REG. 18-BIT DAC VREF VREF AGND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VL LL DL CK DR LR DGND VBR VS VOR VOL VBL AD1868 8 1 1/2 OP213 LEFT CHANNEL OUTPUT 47k 220 F + – 100pF 7.68k 7.68k 1/2 OP213 7.68k 7.68k 330pF 9.76k 330pF 9.76k 6 5 7 100pF RIGHT CHANNEL OUTPUT 47k 220 F + – +5V SUPPLY Figure 8. +5 V Only 18-Bit Stereo DAC |
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