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SA2104S Datasheet(PDF) 7 Page - Silan Microelectronics Joint-stock |
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SA2104S Datasheet(HTML) 7 Page - Silan Microelectronics Joint-stock |
7 / 12 page SA2104/SA2104S HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.07.31 Http: www.silan.com.cn Page 7 of 13 (Continued) Pin voltage (Typ.) (V) Pin No. Symbol Pin description Internal circuit AM FM 22 AM RF IN AM RF input pin. 3.0 3.0 23 RF VCC (VCC for FM OSC stage) -- 3.0 3.0 24 FM RF OUT FM RF output pin. 3.0 3.0 FUNCTION DESCRIPTION Application note: 1. AM low-cut circuit When pin3 is open, no AF signal can pass through the AMP stage because of the common mode. When the value of C3 that connected to pin3 is over 1uF, all AF signal can pass through the AMP stage. The cut-off frequency fL is determined by the internal resistance 22k Ω (Typ.) and the external capacitor C3 as below: C3 x 3 10 x 22 x x 2 1 fL = (Hz) It is possible to reduce the recovered output level at AM mode, by additional resistance between the pin (3) and GND line. 2. FM detection circuit Recommended circuit and recommended coil are as follows. (Test frequency is 10.7M) |
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