This part is a kind of semiconductor called CD1691CB.

Function of this product has Monolithic FM AM radio circuit.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

»ª¾§Ë«¼«µç· µ¥Æ¬µ÷Ƶµ÷·ùÊÕÒô»úµç· CD1691CB 1 ¸ÅÊöÓëÌصã CD1691CB ÊÇÒ»¿é¼¯³É¶È¸ß ¾²Ì¬µçÁ÷С Êä³ö¹¦ÂÊ´ó ´øÓÐ FM/AM Ñ¡Ôñ¿ª¹Ø VCC = 6V RL= 8 ʱ PO = 450 mW µäÐÍÖµ ÄÚÖà AFC ¿É±äµçÈÝ ÄÚº¬ RF AGC IF AGC µ÷г LED Çý¶¯ µç×ÓÒôÁ¿¿ØÖÆ ·â×°ÐÎʽ FM ¾²Òô SOP28 ÍâΧԪ¼þÉٵĵ¥Æ¬ FM / AM ÊÕÒô»ú¼¯³Éµç· ÆäÌصãÈçÏ VCC = 3V ʱ FM ICCQ = 5.3 mA AM ICCQ =3.4 mA µäÐÍÖµ 2 ¹¦ÄÜ¿òͼÓëÒý½Å˵Ã÷ 2.1 ¹¦ÄÜ¿òͼ 28 27 26 25 24 23 22 21 20 19 18 17 16 15 µ÷·ùÖÐƵ¼ì²¨ µ÷гָʾ ¹¦ÂÊ·Å´ó µ÷·ù¸ß·Å µ÷ƵÖзŠµ÷Ƶ¼øƵ µ÷Ƶ¸ß· [ ... ]

CD1691CB PDF Datasheet Download