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ISD5008SI Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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ISD5008SI Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 47 page ISD5008 Product 3 ISD Table 3: Internal Clock Rate/Filter Edge 2.2 ANALOG I/O PINS MIC+, MIC – (Microphone Input+/–) The microphone input transfers the voice signal to the on-chip AGC preamplifier or directly to the ANA OUT MUX, depending on the selected path. The direct path to the ANA OUT MUX has a gain of 6 dB so a 208 mVp-p signal across the differential microphone inputs would give 416 mVp-p across the ANA OUT pins. The AGC circuit has a range of 45 dB in order to deliver a nominal 694 mVp-p into the storage array from a typical electret micro- phone output of 2 to 20 mVp-p. The input imped- ance is typically 10 k Ω. Figure 1: Microphone Input Table 2: External Clock Input Table Duration (Minutes) Sample Rate (kHz) Required Clock (kHz) 4 8.0 1024 5 6.4 819.2 6 5.3 682.7 84.0 512 FLD1 FLD0 Sample Rate (kHz) Filter Pass Band (kHz) 00 8 3.4 01 6.4 2.7 10 5.3 2.3 11 4 1.7 Ra = 10 k 10 k CCOUP = 0.1 F 0.1 F Internal to the device Electret Microphone WM-54B Panasonic 1.5 k 1.5 k 1.5 k 220 F VCC MIC+ MIC NOTE: fCUTOFF= 1 2 RaCCOUP |
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