전자부품 데이터시트 검색엔진 |
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AD1984 데이터시트(PDF) 11 Page - Analog Devices |
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AD1984 데이터시트(HTML) 11 Page - Analog Devices |
11 / 20 page AD1984 Rev. 0 | Page 11 of 20 | January 2007 FILTER/REFERENCE VREF _FILT MIC_BIAS-B MIC_BIAS-C 27 28 29 O O O Voltage Reference Filter. Switchable Microphone Bias. For use with Port B (Pins 21, 22). Switchable Microphone Bias. For use with Port C (Pins 23, 24). Both MIC bias pins are capable of Hi-Z, 0 V, 1.65 V, 3.7 V, and 3.9 V (with 5.0 V on Pin 33), Hi-Z, 0 V, 1.65 V, 2.86 V, and 3.0 V (with 3.3 V on Pin 33). DVCORE 1 O CAUTION: DO NOT APPLY 3.3 V TO THIS PIN! Filter connection for internal core voltage regulator. This pin must be connected to filter caps: 10 μF, 1.0 μF, and 0.1μF connected in parallel between Pin 1 and DVSS (Pin 7). POWER AND GROUND DVIO 3.3V 3 I Link Digital I/O Voltage Reference. 3.3 V DVSS 7 I Digital supply return (ground). DVDD 3.3 V 9 I Digital supply voltage 3.3 V . This is regulated down to DVCORE on Pin 1 to supply the internal digital core internal to the AD1984. AVDD 3.3 V 25, 38 I CAUTION: DO NOT APPLY 5 V TO THESE PINS! Analog supply voltage 3.3 V ONLY. Note: AVDD supplies should be well regulated and filtered as supply noise degrades audio performance. MIC_BIAS_IN 5.0 V or 3.3 V 33 I Source power for microphone bias boost circuitry. Connect this pin to 5.0 V via a low-pass filter. When connected this way the AD1984 is capable of providing +3.9 V as a mic bias to all of the mic bias pins (except on Pin 31). If 5 V is not available, connect this pin to +3.3 V (AVDD) via a low-pass filter. The AD1984 produces a mic bias voltage relative to the AVDD supply (typically 3.0 V @ AVDD = 3.3 V). AVSS 26, 42 I Analog supply return (ground). AVSS should be connected to DVSS using a conductive trace under, or close to, the AD1984. Table 3. AD1984 Pin Descriptions (Continued) Mnemonic Pin No. I/O Description The symbols used in this table are defined as: I = Input, O = Output, LI = Line Level Input, LO = Line Level Output, HP = Output capable of driving headphone load, MIC = Input supports microphones with MIC bias and boost amplifier. |
유사한 부품 번호 - AD1984_15 |
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유사한 설명 - AD1984_15 |
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