ICs for VCR Panasonic AN3972FB, AN3972FC Peak-Noise Reduction plus Output Switching IC for Hi-Fi VCR FM-Audio Mf Overview AN3972FB Unit: num The AN3972FB and AN3972FC are the ICs developed for Hi-Fi VCR FM-audio noise reduction and output switching. In order to reduce the number of parts, bring down costs, and improve performance along with populariza- tion of Hi-Fi VCR, they can provide FM audio system in combination with the FM signal processing IC AN3932 and Rec/head amplifier IC AN3314. i Features Operating supply voltage 12V (typ.) , current consump- tion 28mA (encode mode, typ.) . e Less external parts. AGC level setting-free enabled by independent AGC input pin. e Completely meet with multiplex sound by means of 142404 built-in AGC stereo/bilingual selection electronic switch. Improved sound quality by unique low dynamic DC off- set circuit. AN3972FC Unit : mm e Improved S/N ratio by out-of-band noise elimination by : 4th-order low-pass filter that is fully built in. e Output for RF converter with AGC. e Built-in electronic VR for headphone output. Meet with after-recording in mixing of FM sound and normal sound (at playback) . 48-Pin Quad Flat Package (QFP048-P-1212) i Block Diagram 36 m3 5 (34 (33) S23 m3 need 29 (28 el 27 ne 2 2: 39 we oy 172504 49) ' at 1 o! 48-Pin Quad Flat Package (QFP048-P-1414) Veco dle: sTBIL.1 +(20) ot 42) 1(i9 omer rnans 1 GND @3H sus fea 18 | i (44 bevel vref H17 ' 4: ' 1 t ' 46) ' 1 Po ' (4! F 3 ' 14) R-? 4 toe 48 13 - Mm 6932852 0014613 537 Panasonic 532