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MYB38D Datasheet



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TEST MODE Since the internal op amps and comparators are power Strobed, adjustmenis for sensitivity or low battery level could be difficult and/or time-consuming. B\i forcing Pin 12 10 VSS, the power strobing is b\ passed and the outputs, Pins 1 and 4, constantly show smoke/no smoke and good bai- ter\illow battery, respectively Pin l=VDD for smoke and Pin 4= VDD for low batter\r. In this mode and during the 10 ms power strobe, chip current rises to approximately 50 uA.
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Table 3: Absolute Maximum Ratings Note l: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in Recommended Conditions of Operation, DC Characteristics, or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.

Parameter:	measure to reduce howling	Note
Transmit gain	reduce gain	must meet the SLR limits
Sidetone	increase sidetone cancellation	can be done by optimizing the sidetone network, the better the sidetone cancellation, the more gain can be given to the loudspeaker
Loudspeaker volume	decrease loudspeaker volume	for good performance, a maximum of loudspeaker volume is desirable, therefore this should be the least step
Loudspeaker frequency response	limit bandwidth	howling will occur with the frequency of the highest amplification. Therefore the frequency response curve should be as flat as possible and limited to the speech band(300..3400Hz)
acoustic coupling between loudspeaker and handset microphone	increase distance between loudspeaker and handset microphone	In normal operation, the distance can be down to a few centimeters, when the handset is put onto or off the cradle. The loop should be adjusted such that in normal speech mode there is no howling at distances >5..10 cm. Additionally, the loudspeaker can be mounted away from the handset microphone position, like on the side or on the rear, if possible.

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