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| DOLBY B-TYBE NR PROCESSOR S1A2271B01 INTRODUCTION The S1A2271B01 is a monolithic integrated circuit designed for use in Dolby*B-type noise reduction systems. 16-DIP-300A FEATURES * * * * * Few external components Low quiescent circuit current (Typ ICCQ = 5.3mA) High crosstalk rejection ratio Builtin NR-switch, REC/PB-switch Recommended supply voltage: VCC = 8V - 16V 16-SOP-225A ORDERING INFORMATION Device S1A2271B01-D0B0 S1A2271B01-S0B0 * Package 16-DIP-300A 16-SOP-225A Operating Temperature - 30C - + 85C "Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. This IC is available only to licensees of Dolby Laboratories Licensing Corporation, San Francisco, from whom licensing and application information must be obtained. 1 S1A2271B01 DOLBY B-TYBE NR PROCESSOR BLOCK DIAGRAM REC IN2 PB IN2 9 11 PB OUT2 14 REC OUT2 16 BUFFER VCC RIPPLE FILTER 10 12 VOLTAGE REGULATOR VCA & HPF RMS DETECTOR 15 RIPPLE FILTER NR SW 13 R/P SW 4 CONTROL SWITCH GAIN FACTOR 5 R-CONSTANT RMS DETECTOR GND 7 BUFFER VCA & HPF 2 RIPPLE FILTER 8 6 3 PB OUT1 1 REC OUT1 REC IN1 PB IN1 2 DOLBY B-TYBE NR PROCESSOR S1A2271B01 PIN CONFIGURATION REC OUTPUT1 RIPPLE FILTER PB OUTPUT1 REC/PB CONTROL R-CONSTANT PB INPUT1 GND REC INPUT1 1 2 3 4 16 15 14 13 REC OUTPUT2 RIPPLE FILTER PB OUTPUT2 NR CONTROL INPUT RIPPLE FILTER PB INPUT2 Vcc REC INPUT2 S1A2271B01 5 6 7 8 12 11 10 9 ABSOLUTE MAXIMUM RATINGS (Ta = 25C) Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC PD TOPR TSTG Value 16 750 -30 - +85 -40 - +125 Unit V mW C C NOTE: Derated above Ta = 25C in the proportion of 10mW/C 3 S1A2271B01 DOLBY B-TYBE NR PROCESSOR ELECTRICAL CHARACTERISTICS (Ta = 25C, Vcc = 12V, f = 1kHz, 0dB = 245mW (-10dBm) at REC OUT, unless otherwise specified) Characteristic Quiescent Citcuit Current Buffer Voltage Gain Symbol ICCQ GV Test Conditions REC mode, NR-off, VI = 0 REC mode, PB out = 0dB RECout = -25dB, f = 500Hz RECout = -25dB, f = 2kHz NR-REC Boost GV(BST) RECout = -25dB, f = 5kHz RECout = -40dB, f = 10kHz RECout = 0dB, f = 10kHz NR-Boost Balance MAX.RECout level CB VO (MAX) NR-REC boost CH to ratio REC mode, NR-off THD = 1% REC mode, NR-off RECout = 10dB REC mode, NR-on RECout = 10dB NR-effect S/N S/N REC mode, RG = 2.2K Filter = CCIR/ARM NR-off, OUTPUT = 0dB PB to REC CH to CH, NR-off OUTPUT = 0 dB Input Impedance Switch Control Voltage VCTL REC VI Input Level PB VI ZI High mode Low mode REC mode, NR-off RECout = 0dB PB mode, NR-off RECout = 0dB REC mode, NR-off RECout = 0dB Testpoint = PB output - Min. 3.5 25 1.4 5.5 3.9 9.0 -1.1 - 14 - - 65 - - 30 2.4 0 -32 -32 Typ. 5.6 27 2.9 7.0 5.4 10.4 0.4 0 15.9 0.04 0.04 69 -70 -70 47 - - -30 -30 Max. 7 29 4.4 8.5 6.9 11.9 1.9 1 - 0.2 0.3 - -60 -60 60 - 0.4 -28 -28 Unit mA dB dB dB dB dB dB dB dB % % dB dB dB K V V dBm dBm REC Output Voltage THD Crosstalk CT Output Level VO 489 549 616 mV 4 DOLBY B-TYBE NR PROCESSOR S1A2271B01 TEST CIRCUIT REC OUTPUT2 PB OUTPUT2 PB INPUT2 REC INPUT2 Vcc 100k 100k 2.2k 2.2k 1 F 0.68 F (10%) 1 F 100 F 1 F 1 F ON NR OFF 16 15 14 13 12 11 10 9 15k S1A2271B01 4.7k 1 2 3 4 5 6 7 8 PB 0.68 F (10%) 1 F 1 F 47k (2%) 100k 1 F 1 F R/P REC 2.2k 100k 2.2k REC OUTPUT1 PB OUTPUT1 PB INPUT1 REC INPUT1 5 S1A2271B01 DOLBY B-TYBE NR PROCESSOR 6 DOLBY B-TYBE NR PROCESSOR S1A2271B01 7 S1A2271B01 DOLBY B-TYBE NR PROCESSOR APPLICATION INFORMATION Power Supply The S1A2271B01 can be operated at 8V - 16V with a single power supply, and 4V - 8V with a dual power supply. 5 6 7 8 12 GND S1A2271B01 11 10 9 +VBB +VEE Dual power connection Switch Control Voltage All functions of S1A2271B01 are controlled by internal electronic switches. The function switch is operated by the DC voltage of NR and R/P control pins. NR, R/P Condition VH PB NR-off VL REC NR-on Single VH 2.4V VL 0.4V Reference Level Dual Power VH VEE + 2.4V VL VEE + 0.4V The reference output level of the Dolby noise reduction system is defined as Dolby level. The Dolby level of S1A2271B01 is 245mV (-10dBm) at f = 400Hz. 8 |
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