PDF HA12215F Data sheet ( Hoja de datos )

Número de pieza	HA12215F
Descripción	Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
Fabricantes	Hitachi Semiconductor
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No Preview Available ! HA12215F Audio Signal Processor for Cassette Deck (Dolby B-type NR with Recording System) ADE-207-253D (Z) Target Specification 5th Edition Oct. 1999 Description HA12215F is silicon monolithic bipolar IC providing Dolby noise reduction system1, music sensor system, REC equalizer system and each electronic control switch in one chip. Note: 1. Dolby is a trademark of Dolby Laboratories Licensing Corporation. A license from Dolby Laboratories Licensing Corporation is required for the use of this IC. Functions • Dolby B-NR × 2 channel • REC equalizer × 2 channel • Music sensor × 1 channel • Pass amp. × 2 channel • Each electronic control switch to change REC equalizer, bias, etc. Features • REC equalizer is very small number of external parts and have 6 types of frequency characteristics built-in. • 2 types of input for PB, 1 type of input for REC. • 70µ - PB equalizer changing system built-in. • Dolby NR with dubbing double cassette decks. Unprocessed signal output available from recording out terminals during PB mode. • Provide stable music sensor system, available to design music sensing time and level. • Controllable from direct micro-computer output. • Bias oscillator control switch built-in. • NR ON / OFF and REC / PB fully electronic control switching built-in. • Normal-speed / high-speed, Normal / Crom / Metal and PB equalizer fully electronic control switching built-in. • Available to reduce substrate-area because of high integration and small external parts. 1 page HA12215F Pin Description, Equivalent Circuit (VCC = ±7 V, A system of split supply voltage, Ta = 25°C, No Signal, The value in the show typical value.) (cont) Pin No. 21 49 50 Terminal Name V CC GND VEE Note V=V CC V = 0V V = VEE Equivalent Circuit 45, 54 15 NC ALC ON/OFF No connection I = 50 µA V 22 k I Pin Description Power supply GND pin Negative power supply No connection Mode control input 16 PB A/B 17 A 120/70 18 NORM/HIGH 19 B NORM/CROM/ METAL 20 BIAS ON/OFF 22 RM ON/OFF 23 NR ON/OFF 25 LM ON/OFF 24 REC/PB/PASS 26 MSOUT I = 0 µA 100 k GND 2.5 V + − Mode control input 100 k 100 k 22 k V V VCC I MS output (to MPU) 1 MSGND Note: 1. MS: Music Sensor VEE Rev.5, Oct. 1999, page 5 of 69 5 Page HA12215F PB Equalizer By switching logical input level of pin 17 (for Ain) and pin 19 (for Bin), you can equalize corresponding to tape position at play back mode. With the capacity C2 capacitance that we showed for figure 2 70 µs by the way figure seem to 3 they are decided. GV t1 t2 t1 = C2 ⋅ (12k + 15k) t2 = C2 ⋅ 15k f Figure 3 Frequency Characteristic of PB Equalizer The Sensitivity Adjustment of Music Sensor Adjusting MS Amp gain by external resistor, the sensitivity of music sensor can set up. REP PB (L) −6dB VCC C16 R13 1000p 330k + C13 0.33µ D VCC 8.2k LPF 25kHz MAI 100k MA MSIN MS OUT DET RL − + MS AMP DET 50k MS OUT GND Microcomputer GND PB (R) Figure 4 Music Sensor Block Diagram Rev.5, Oct. 1999, page 11 of 69 11 Page

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