HA12157NT Datasheet | Hitachi Semiconductor

Description HA12155NT/HA12157NT is silicon monolithic bipolar IC providing Dolby noise reduction system- , electrical volume system, REC equalizer system and level meter system in one chip. Functions - REC equalizer - Dolby B/C NR - Electronic volume - Level Meter × 2 channel × 2 channel × 2 channel × 2 channel Features - Inductor less REC equalizer is adjustable of its characteristics by external resistor - Rec level is adjustable automatically with electrical volume which is built-in - 3 type of input selection is available (one is by way of electrical volume) - Separate input selection SW and REC/PB SW - Dolby noise reduction with dubbing cassette decks (Unprocessed signal output available from recording out terminals during PB mode) - Log-pressed level meter output is range from 0 V to 5 V (Usable as music search switchable gain of 0 d B and 20 d B respectivily) - Normal-speed/high-speed (Double), normal/metal/chrome fully electronic control switching built-in - NR-ON/OFF, Dolby B/C, MPX ON/OFF fully electronic control switching built-in (Controllable from micro-controller directly) - Reduction of number of pin by transfered serial data to electronic volume control switching and another control switching (Controllable from micro-controller directly) - Low external parts count HA12155NT/HA12157NT - Dolby is a trademark of Dolby Laboratories Licensing Corporation. A license from Dolby Laboratories Licensing Corporation is required for the use of this IC. Ordering Information Operating voltage Type HA12155NT HA12157NT Package DP-64S Dolby Level 300 m Vrms REC-OUT Level PB-OUT Level 300 m Vrms 580 m Vrms 775 m Vrms Min 9.5 V 12 V Max 16 V 16 V Rev.4, Jun. 1997, page 2 of 57 Block Diagram GND VRI CNT RPI PBI DATA CLK STB (1) (L) (L) (L) BIAS (L) DGND NRIN Vref M (L) (L) IA OUT (L) PB OUT (L) GND EQ (2) OUT(L) P X REC OUT(L) LM IN(L) LM OUT(L) EQ IN(L) 51 47 38 46 45 44 42 39 50 49 48 41 40 43 NN NC NM HN HC HM 37 36 35 34 33 64 55 52 53 62...