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AD1866R-REEL データシート(PDF) 7 Page - Analog Devices |
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AD1866R-REEL データシート(HTML) 7 Page - Analog Devices |
7 / 12 page + 5V + 5V + 5V FALSE GROUND (2.5V) V O R V O L V O R V O L Figure 8a. Schematic Using False Ground Figure 8a illustrates the traditional approach used to generate false ground voltages in single supply audio systems. This cir- cuit requires additional power and circuit board space. The AD1866 eliminates the need for “false ground” circuitry. VBR and VBL generate the required bias voltages previously generated by the “false ground.” As shown in Figure 8b, VBR and VBL may be used as the reference point in each output channel. This permits a dc coupled output signal path. This eliminates ac coupling capacitors and improves low frequency performance. It should be noted that these bias outputs have relatively high output impedance and will not drive output cur- rents larger than 100 µA without degrading the specified performance. Analog Circuit Considerations–AD1866 REV. 0 –7– +5V +5V 15 14 13 12 11 10 16 9 1 2 3 4 5 6 8 7 NRL AGND NRR AD1866 LL DL CLK DR LR DGND V O L V O R V O R V S V B R V O L V S V L V B L Figure 8b. Circuitry Using Voltage Biases DISTORTION PERFORMANCE AND TESTING The THD+N figure of an audio DAC represents the amount of undesirable signal produced during reconstruction and play- back of an audio waveform. Therefore, the THD+N specifica- tion provides a direct measure to classify and choose an audio DAC for a desired level of performance. Figure 1 illustrates the typical THD+N versus frequency performance of the AD1866. It is evident that the THD+N performance of the AD1866 re- mains stable at all three amplitude levels through a wide range of frequencies. A load impedance of at least 2 k Ω is recom- mended for best THD+N performance. Analog Devices tests all AD1866s on the basis of THD+N per- formance. During the distortion test, a high speed digital pat- tern generator transmits digital data to each channel of the device under test. Sixteen-bit data is latched into the DAC at 352.8 kHz (8 × F S). The test input code is a digitally encoded 990.5 Hz sine wave with 0 dB, –20 dB, and –60 dB amplitudes. A 4096 point FFT calculates total harmonic distortion + noise, signal-to-noise ratio, and D-range. No deglitchers or external adjustments are used. |
同様の部品番号 - AD1866R-REEL |
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同様の説明 - AD1866R-REEL |
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