ICs for Cassette, Cassette Deck AN6291, AN6291S Dual dbx II Noise Reduction System ICs AN6291 1.2±0.25 0.5±0.1 2.54 26.7±0.3 1.0±0.25 3.3±0.25 + 0.1 .05 0.35 – 0 3 ~15˚ 10.16±0.25 22-Lead DIP Package (DIP022-P-0400A) AN6291S 22 21 20 19 18 17 16 15 14 13 12 0.3 7.2±0.3 9.4±0.3 22-Lead SOP Package (SOP022-P-0375) 15.3±0.3 1 2 3 4 5 6 7 8 9 10 11 0.15 0.925 1.09 Unit : mm 0.4±0.25 VCC (opr) =1.8V to 14V 22 21 20 19 18 17 16 15 14 13 12 4.7±0.25 1.27 ■ Features • Wide dynamic range : 110dB • Low operating voltage : VCC (min.) =1.8V • Fewer external components • Adjustment : only one • Low power consumption • Wide operating supply voltage range : Unit : mm 1 2 3 4 5 6 7 8 9 10 11 8.6±0.3 0.1±0.1 The AN6291 and the AN6291S are the single chip ICs suitably developed for noise reduction of dbxII type and used for stereo operation. They can be used for U.S. sound multiplex TV. 1.8V low voltage operation enables to apply for battery-operated equipment to the Hi-Fi deck. Package is available for 22-pin DIL plastic and 22-pin SOP package. Equipment can be minitualized and high integration. 2.0±0.2 ■ Overview ICs for Cassette, Cassette Deck AN6291, AN6291S ■ Block Diagram VCC NC RMS IN–B TIMING –B CCA IN–B CAP 1–B CAP 2–B VOUT– B 22 21 20 19 18 17 16 15 ON – OFF –B I TIME ENCODE 14 13 12 VCC – RMS OP Amp. CCA + Current Source Logic Timing Current + RMS OP Amp. CCA – Bias GND SUB 1 2 3 4 5 6 7 8 ADJ GND RMS IN– A TIMING –A CCA IN– A CAP 1– A CAP 2– A VOUT– A 9 ON – OFF –A ■ Pin Descriptions Pin No. Pin Name Pin No. Pin Name 1 Adjustment of timing current 12 ENCODE 2 GND 13 I TIME 3 RMS IN-A 14 ON-OFF-B 4 TIMING-A 15 VOUT-B 5 CCA IN-A 16 CAP-2-B 6 CAP-1-A 17 CAP-1-B 7 CAP-2-A 18 CCA IN-B 8 VOUT-A 19 TIMING-B 9 ON-OFF-A 20 RMS IN-B 10 N.I. 21 NC 11 DECODE 22 VCC 10 11 N.I. DECODE ICs for Cassette, Cassette Deck AN6291, AN6291S ■ Absolute Maximum Ratings (Ta=25˚C) Symbol Rating Supply Voltage Parameter VCC 14.4 Unit Supply Current ICC 5 mA mW V Power Dissipation (Ta=75˚C) PD 100 Operating Ambient Temperature Topr –20 ~ + 75 ˚C AN6291 Tstg –55 ~ + 125 ˚C AN6291S Tstg –40 ~ + 125 ˚C Storage Temperature ■ Electrical Characteristics (VCC=3V, Ta=25˚C) Parameter Input/Output Characteristics/ENCODE Mode Input/Output Characteristics/DECODE Mode Maximum Output Voltage Symbol –2 0 +2 VIN= –40dB, f=1kHz –23 –20 –17 VOD –1 VIN = + 10dB, f=1kHz 17 20 23 VOD –2 VIN=0dB, f=1kHz –2 0 +2 VOD –3 VIN= –20dB, f=1kHz –44 –40 –36 80 150 200 450 THDD Noise Output Voltage ENCODE Mode VNOE DECODE Mode VNOD Difference Between Channels ENCODE Mode CDE DECODE Mode CDD CT SVRR ICC Input/Output Characteristics/dbx OFF Mode VOFF Total Harmonic Distortion/dbx OFF Mode THDOFF Output Noise Voltage/dbx OFF Mode Note) 0dB= 20mV= –34dBV max. VIN = 0dB, f=1kHz VOME Quiescent Current typ. VOE –3 VOMD Ripple Rejection Ratio/DECODE Mode 7.5 VOE –2 DECODE Mode Crosstalk/ENCODE Mode min. VIN = + 20dB, f=1kHz ENCODE Mode Total Harmonic Distortion/DECODE Mode Condition VOE –1 VnOFF THD=1%, f=1kHz 10 Unit 12.5 dB dB mV VO = + 14dB, f=1kHz 0.15 0.3 % Input Short A-weight 100 200 3 6 µV –1.2 0 1.2 –1.2 0 1.2 50 60 VIN= 0dB, f=1kHz Measuring channel : Short Another channel : Output 200mV, f=1kHz f=60Hz, V=100mV, Input Short VCC =3V, Input Short VIN = + 20dB, f=1kHz VIN = + 20dB, f=1kHz Input Short, A-weight 40 17 dB dB dB 55 1.8 3.2 mA 20 23 dB 0.3 1 % 10 20 µV ICs for Cassette, Cassette Deck AN6291, AN6291S 0 –20 VOUT –40 –60 –80 Vno –100 –120 –140 +20 VCC= 3V Vin= –34dBV 100 1k VCC= 3V Vin= – 34dBV 0 –20 VOUT –40 –60 –80 –100 –120 1.0 0.5 0 20 10k 20k 1.5 Vno –140 20 100 Frequency f (Hz) 1k 10k 20k 20 100 Frequency f (Hz) THD – f (Decoder mode) 1k 10k 20k Frequency f (Hz) VOUT, THD –VIN (Encoder mode) VOUT, THD–VIN (Decoder mode) –10 2.0 VCC = 3V Vin= – 34dBV VCC= 3V f= 1kHz –0 VCC= 3V f= 1kHz 1.5 –50 1.0 THD –60 0 20 100 1k Frequency f (Hz) 10k 20k –70 –100 0.5 –80 –60 –40 –20 Input Voltage VIN (dBV) 0 0 +20 OU T 2.0 –40 1.5 –60 1.0 –80 0.5 THD –100 0 –70 –60 –50 –40 –30 Input Voltage VIN (dBV) –20 Total Harmonic Distortion THD (%) –40 –20 V OU 2.0 Output Voltage VOUT (dBV) 0.5 –30 Total Harmonic Distortion THD (%) 1.0 V 1.5 T –20 Output Voltage VOUT (dBV) Total Harmonic Distortion THD (%) THD – f (Encoder mode) 2.0 Total Harmonic Distortion THD (%) VCC= 3V Vin= – 34dBV VOUT, Vno– f (Decoder mode) Output Noise Voltage Vno, Output Voltage VOUT (dB) Output Noise Voltage Vno, Output Voltage VOUT (dB) VOUT, Vno– f (Encoder mode) +20 ICs for Cassette, Cassette Deck AN6291, AN6291S ■ Application Circuits 1 Switching circuit of recording/playback +VCC E 0.1µF – 3.3kΩ 10µF + D E 330pF + 0.47µF 2SC1327 + 0.033µF 51kΩ – SW1e + 22µF 10µF + 1kΩ 6800pF – Output –B – 0.01µF 15kΩ 1kΩ 10kΩ 150kΩ 6800pF – 0.1µF 4.7kΩ 33kΩ 6.8kΩ 15kΩ SW1b 0.0033µF 0.0033µF 270k 33kΩ SW2a OFF ON 560Ω – 15kΩ + 10µF SW1a 0.1µF 2700pF D 330Ω Input –B D E *2 21 20 19 18 17 16 15 RMS– B CCA– B OP Amp.– B RMS – A CCA– A OP Amp.– A 14 13 9 10 12 Logic 22 Current Source SUB 1 2 3 4 5 6 7 8 – 2k (B) + 10kΩ 330pF 0.0033µF 0.0033µF 270kΩ 51kΩ – 1µF 6800pF 1kΩ 0.033µF 2SC1327 1µF 4.7kΩ 33kΩ 6.8kΩ – + 330Ω 15kΩ 0.47µF 6800pF D – SW1d 2700 pF SW1e 3.3kΩ 33kΩ 0.1µF 15kΩ + 22µF 10µF – 150kΩ 11 + *1 + 10µF 0.01µF Output –A ON – 560Ω OFF SW2b 51kΩ E + 0.1µF E D Input –A Logical condition of recording/playback Pin11 Pin12 Mode VCC Open DECODE Open VCC ENCODE VCC VCC OFF * 1 Signals of 1kHz, 20mV are applied to the input of both channels at the same time, sinking current into the Pin13 should be adjusted to 15µA±5%. Standard value at VCC=3V is about 1kΩ. * 2 External circuit should not be connected with Pin21. Connected in the IC. * 3 Users should follow the latest technical information from dbx company. Constant number might be changed. Note 1) All the resistors and the capacitor with the mark should be used in the error less than ±5%. Note 2) S1a~ S1e : Switch record, playback (Above figure shows “PLAYBACK” mode). Note 3) S2a~ S2b : dbx ON-OFF switch (Above figure shows “ON” mode). ICs for Cassette, Cassette Deck AN6291, AN6291S 2 Playback exclusive circuit (Designed noise at dbx OFF mode to be small) +VCC 0.033µF 1kΩ 4700pF 0.47µF Input –B – + 10kΩ 10µF + 150Ω 0.01 µF 560Ω Output –B – – – + + 0.33µF – 21 16kΩ 4.7kΩ 16kΩ *2 NC 22 + 0.022µF 10µF 20 19 RMS– B 18 17 16 15 14 dbx ON– OFF Open “ON” ( ) 12 OP Amp.– B CCA– B Logic 1 2 RMS–A 3 4 *1 2kΩ (B) OP Amp.– A CCA–A 5 6 7 8 9 10µF 10kΩ – + 0.33µF – – + 1kΩ 0.47µF 16kΩ 11 + – 1µF 68µF 150Ω + 0.022µF 16kΩ + 10 4.7kΩ Sub – + – 13 Current Source Input –A 10µF 1kΩ 68µF 4700pF + – 10µF 560Ω Output –A 0.01µF 0.033µF * 1 Signals of 1kHz, 20mV are applied to the input of the both channels, adjust sinking current into the Pin13 to 15µA±5% Standard value at VCC=3V is about 1kΩ. * 2 External circuit should not be connected with the Pin21. Connected in the IC. * 3 Users should follow the latest technical information from dbx company. Constant number might be changed. Note 1) All the resistors and the capacitor with the mark should be used in the error less than ±5%. Note 2) Impedance of the input signal source should be less than 100Ω. ICs for Cassette, Cassette Deck AN6291, AN6291S ■ Effect of dbxII Noise Reduction System (Without noise reduction system) +20dB Fortissimo +10dB Playback Output 60 ~ 70dB Magnetron tape 100dB Recording DC range +10dB 0dB Input Level Fortissimo (large sound) distortes due to magnetron saturation Magnetron saturation level Distortes – 60dB Z- – 60dB Noise level Pianissimo Even if input width is 100dB, width 60-70dB is playbacked in output. Noise Pianissimo (small sound) is erased by the hysnoise of tape – 80dB (When dbx II System is ON) +10dB Compressed to 1/2 by dB Magnetron tape Recording (Encode) 100dB Input level 0dB Expanded to 2 times by dB – 40dB o sim nis se Pia rea c n I – 80dB +20dB Pian issim Dec o reas e– 80d Noi B se l eve l D range is expanded in equal value as fortissimo is increased and pianissimo is decreased its level, and they are playbacked. 100dB of input range is playbacked as well Small sound is playbacked, too. Noise Fortissimo is decreased less than saturation level and pianissimo is increased more than noise level. Thus they are recorded. Large sound is playbacked without distortion Output Increase mo Fortissi D range Decre ase simo Fortis Playback (Decode) +20dB Noise level is decreased more than by 30dB at the playback mode (Improvement of S/N ratio) ■ Cautions (1) When users use the AN6291 and the AN6291S, contract should be made between the dbx Technology Licensing. dbx licence and trademark should be contacted with the following. the U.S.A. : dbx Technology Licensing JAPAN Office : dbx Technology Licensing 433 California Street, Third Floor Tel : 03-3378-0915 San Francisco, California 94104 Fax : 03-3374-5191 Tel : 415-765-2801 Fax : 415-765-2141 (2) Capacitor between the Pin6 – 7 and Pin16 –17 is used to cut DC current. When leakage of DC current is large, encode and decode characteristics is not right value, capacitor's leakage should be as minimum as possible. (3) The AN6291 is a low power consumption current type. So effection of wiring resistance is small and oscillation character-ist of pattern location is good, however, when impedance of the input pin is high, wiring should be shorter because it is easily effected by external noises.