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SA2531D 데이터시트(PDF) 5 Page - Sames |
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SA2531D 데이터시트(HTML) 5 Page - Sames |
5 / 24 page sames SA2531 A/B/C/E/G/U 5/24 or after pressing the MUTE key, the gain is reduced by > 60 dB. Receive The receive input is the differential signal of RI and STB. The gain of the receive path is 2 dB (test circuit figure 5) with differential outputs, RO1/RO2 (0dB on 1000 Ω versions). When mute is active during dialling the gain is reduced by > 60dB. During DTMF dialling a MF comfort tone is applied to the receiver. The comfort tone is the DTMF signal with a level that is -30dB relative to the line signal. The receive gain can be adjusted under user control by using the volume control keys (not on SA2531D). The VOL key gives a 4dB increase or returns the gain to normal in a Toggle Function. Alternatively the + and - keys may be used. The + key increases the gain to a maximum of +6dB while the - key reduces the gain to a minimum of -4dB. Each press of the keys changes the gain by approximately 2dB. The gain is reset by the next on-hook. Side Tone Side Tone is controlled along with Return Loss by a Double Balance Bridge as shown in Fig. 1. Figure 1 Double balance bridge (return loss and side tone) with one common ground A good side tone cancellation is achieved by using the following equation: ZBAL = R5 ZLINE R1 |
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