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SA2111CS Scheda tecnica(PDF) 4 Page - Silan Microelectronics Joint-stock |
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SA2111CS Scheda tecnica(HTML) 4 Page - Silan Microelectronics Joint-stock |
4 / 9 page SA2111C HANGZHOU SILAN MICROELECTRONICS CO.,LTD Rev: 1.1 2005.10.26 Http: www.silan.com.cn Page 4 of 10 (Continued) Pin No. Symbol Description 8 FM IF IN FM IF INPUT 9 GND GND for AM, FM IF, FM MPX stage 10 TUN LED tuning LED 11 ST LED Stereo LED 12 QUAD FM QUAD. Detector 13 14 R-OUT L-OUT R-channel Output L-channel Output 15 LPF1 • LPF terminal for synchronous detector • VCO stop terminal V15=VCC→VCO STOP 16 LPF2 • LPF terminal for phase detector • Bias terminal for AM/FM SW circuit V16=VCC →AM V16=OPEN →FM 17 MPX IN MPX INPUT 18 DET OUT FM & AM DETECT OUTPUT 19 AFC AUTO FREQUENCY CONTROL 20 AM OSC AM OSC 21 FM OSC FM OSC 22 RF VCC VCC for FM OSC stage 23 FM RF OUT FM RF OUTPUT 24 AM RF IN AM RF INPUT 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. |
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