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U4090B-FN Datasheet(PDF) 13 Page - ATMEL Corporation |
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U4090B-FN Datasheet(HTML) 13 Page - ATMEL Corporation |
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13 / 34 page  U4090B Preliminary Information TELEFUNKEN Semiconductors Rev. C1, 28-Oct-96 13 (34) ATAFS (dB) 36 dB ATAFSm ATAFS a GSA o GSA a GSA (dB) not usable RATAFS RATAFS 94 8957 Figure 8. Reducing speaker amplifier gain results in an equal reduction of AFS attenuation IL PD LIDET 94 8958 Figure 9. Line detection with two comparators for speech mode and pulse dialling Line detection (LIDET) The line current supervision is active under all operating conditions of the U4090B. In speech mode (PD = inactive) the line current comparator uses the same thresholds as the comparator for switching off the entire speaker amplifier. The basic behaviour is illustrated in figure 13. Actual values of ILON/ILOFF vary slightly with the adjustment of the DC-characteristics and the selection of the internal line impedance. When Power Down is activated (during pulse dialing), all of the line current flows through the short circuiting transistor QS (see figure 6). As long as IL is above typ. 1.6 mA, output LIDET is low. This comparator does not use hysteresis. LIDET ILOFF ILON IL 94 8959 Figure 10. Line detection in speech mode with hysteresis |
Similar Part No. - U4090B-FN |
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Similar Description - U4090B-FN |
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