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ISD2532E Datasheet(PDF) 7 Page - Winbond |
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ISD2532E Datasheet(HTML) 7 Page - Winbond |
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7 / 42 page  ISD2532/40/48/64 PIN NO. PIN NAME SOIC/ PDIP TSOP FUNCTION VCCA, VCCD 16, 28 23, 7 Supply Voltage: To minimize noise, the analog and digital circuits in the ISD2500 series devices use separate power busses. These voltage busses are brought out to separate pins and should be tied together as close to the supply as possible. In addition, these supplies should be decoupled as close to the package as possible. MIC 17 24 Microphone: The microphone pin transfers input signal to the on- chip preamplifier. A built-in Automatic Gain Control (AGC) circuit controls the gain of this preamplifier from –15 to 24dB. An external microphone should be AC coupled to this pin via a series capacitor. The capacitor value, together with the internal 10 KΩ resistance on this pin, determines the low-frequency cutoff for the ISD2500 series passband. See Winbond’s Application Information for additional information on low-frequency cutoff calculation. MIC REF 18 25 Microphone Reference: The MIC REF input is the inverting input to the microphone preamplifier. This provides a noise-canceling or common-mode rejection input to the device when connected to a differential microphone. AGC 19 26 Automatic Gain Control: The AGC dynamically adjusts the gain of the preamplifier to compensate for the wide range of microphone input levels. The AGC allows the full range of whispers to loud sounds to be recorded with minimal distortion. The “attack” time is determined by the time constant of a 5 KΩ internal resistance and an external capacitor (C2 on the schematic of Figure 5 in section 11) connected from the AGC pin to VSSA analog ground. The “release” time is determined by the time constant of an external resistor (R2) and an external capacitor (C2) connected in parallel between the AGC pin and VSSA analog ground. Nominal values of 470 KΩ and 4.7 µF give satisfactory results in most cases. ANA IN 20 27 Analog Input: The analog input transfers analog signal to the chip for recording. For microphone inputs, the ANA OUT pin should be connected via an external capacitor to the ANA IN pin. This capacitor value, together with the 3.0 KΩ input impedance of ANA IN, is selected to give additional cutoff at the low-frequency end of the voice passband. If the desired input is derived from a source other than a microphone, the signal can be fed, capacitively coupled, into the ANA IN pin directly. Publication Release Date: June 2003 - 7 - Revision 1.0 |
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