ICs for Cassette, Cassette Deck AN7374K, AN7376S Dolby* B/C Type Noise Reduction IC AN7374K ■ Features • Fewer external parts • Spectral skewing circuit and anti-saturation circuit built- • 28 27 26 25 24 23 22 21 20 19 18 17 16 15 in. Available for double deck (Through signal output to REC output at PB mode.) Available for ±2 or 1 power supply 1.05±0.25 3.05±0.25 8.4±0.3 4.8±0.25 0.3 * Dolby is the trademark of Dolby Laboratories Licensing 3 ~15˚ Cor-poration. + 0.1 – 0.05 10.16±0.25 28-Lead Shrunk DIP Package (SDIP028-P-0400A) AN7376S 17.81±0.3 0.15 1.27 0.1±0.1 0.3 ■ Block Diagram 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0.925 0.4±0.25 0.45 Unit : mm 7.2±0.3 9.4±0.3 28-Lead SOP Package (SOP028-P-0375A) VCC 28 27 26 25 24 23 22 21 20 19 Line Mpx–Dr VREF 18 OS–L Buff. SS + AS + Buff. SS + AS + Switch Logic Bias OS–L OS–H VREF Mpx–Dr IREF VCR–H VCR–L Rect–H Line 1 15 VCR–L OS–H GND 16 Rect–L Rect–H VCR–H Stab 17 2 3 4 5 6 7 8 9 10 11 Rect–L 12 13 14 2.0±0.2 • 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1.778 26.7±0.3 The AN7374K, AN7376S are 2-ch dolby B/C type noise reduction ICs. Filter circuits (MPX filter driver and spectral skewing, etc.) are incorporated in 28-pin package. It can configure with very few external parts. 0.5±0.1 ■ Overview 0.9±0.25 Unit : mm ICs for Cassette, Cassette Deck AN7374K, AN7376S ■ Absolute Maximum Ratings (Ta=25˚C) Parameter Symbol Rating Unit Supply Voltage VCC 13.5 Supply Current ICC 22 mA mW V Power Dissipation PD 300 Operating Ambient Temperature Topr –30 ~ + 80 ˚C Storage Temperature Tstg –55 ~ + 150 ˚C ■ Recommended Operating Range (Ta= 25˚C) Parameter Symbol Operating Supply AN7374K Voltage Range AN7376S Range 9V ~ 13V or ± 4.5V ~ ±6.5V VCC 7V ~ 13V or ± 3.5V ~ ±6.5V ■ Electrical Characteristics (Ta=25˚C, VCC =12V, In the Dolby Reference Level ; 388mVrms (= – 6dBm) REC – OUT) Parameter Symbol Quiescent Current Condition R/P NR f(Hz) Others min. typ. max. Unit ICQ R off No signal 12 15 19 mA Rec.– IN to Rec.– OUT Gain Grin R off 1k Vin = 0dB 17 19 21 dB PB – IN to Rec.– OUT Gain Gpin P P→ Pm off 1k Vin = 0dB 22 24 26 dB off 1k Vin = 0dB –1 0 1 dB MPX ON/OFF Gain Difference LINE – OUT Output Level AN7374K AN7376S B Type Encode · Boost C Type Encode · Boost Signal · Handling DGmpx Vlout P off 1k Vin = 0dB 500 330 580 388 670 mVrms 450 mVrms 1 B–R–1 R B 10k Vin = – 40dB 9.4 10.4 11.9 2 B–R–2 R B 5k Vin = – 30dB 6.7 8.2 9.7 dB 3 B–R–3 R B 1k Vin = – 25dB 4.2 5.7 7.2 dB 4 B–R–4 R B 10k Vin = 0dB – 1.1 0.4 1.9 dB 1 C–R–1 R C 1k Vin = – 60dB 18.1 19.6 21.6 dB 2 C–R–2 R C 5k Vin = – 40dB 11.5 13.5 15.5 dB 3 C–R–3 R C 300 Vin = – 30dB 8.7 10.7 12.7 dB 4 C–R–4 R C 5k Vin = – 25dB 3.5 5.5 7.5 dB 5 C–R–5 R C 15k – 8.3 – 6.3 – 4.3 dB 12 12 14 14 0.02 0.15 dB dB % 0.13 0.3 % AN7374K AN7376S off Distortion C SN Ratio Crosstalk off 1k THDoff R off 1k THD – C R C 1k S/N R C Vin = 0dB Rg = 5.1kΩ CCIR/ARM 60.0 62.5 dB CT – R – P P off 1k Vin = 0dB – 80 dB PB→Rec. CT – P – R R off 1k Vin = 0dB – 80 dB Ch.→Ch. CT – C – C R 1k Vin = 0dB – 80 dB Voff R off off →C D – GV R off 1k Channel Balance PB VC – P Rec. VC – R PBmpx C NR Control Voltage R Rec.→PB Mode Switching Offset Mode Control Voltage VOmax. Vin = 0dB THD VCC = 9.0V = 1% VCC = 7.0V Vin = 0dB dB No signal – 70 0 70 mV Vin = 0dB – 1.0 0 1.0 dB 9.0 12.5 V 5.0 7.0 V – 0.5 3.0 V 9.0 12.5 V Pin26 Applied Voltage VC – Pm VC – C B VC – B off VC – off Pin3 Applied Voltage 5.0 7.0 V – 0.5 3.0 V ICs for Cassette, Cassette Deck AN7374K, AN7376S ■ Application Circuits • For 1 Power Supply PB/Rec. Rec. In /PBmpx PB In +VCC 1µF + 28 1µF + 27 26 5.6kΩ MPX FIL 24 Rec. Out 1µF 2.4kΩ 25 0.47µF Line Out 1500pF 23 22 21 1500pF 0.47µF 20 19 18 17 16 15 9 10 11 12 13 14 AN7374K 1 2 3 + 1µF 4 5 1µF Rec. In off/B/C 7 8 1500pF 22kΩ 2.4kΩ GND 6 + MPX FIL PB In 1500pF 0.47µF Line Out 5.6kΩ Rec. Out 0.47µF • For ±2 Power Supply PB/Rec. Rec. In /PBmpx PB In +VCC 2.4kΩ 1µF + 28 5.6kΩ MPX FIL GND 26 1500pF 25 24 Rec. Out 0.47µF 1µF + 27 0.47µF Line Out 23 22 21 1500pF 20 19 18 17 16 15 9 10 11 12 13 14 2 1µF 3 + 4 1µF 5 2.4kΩ –VCC Note) Rec. In off/B/C 6 7 8 + PB In 22kΩ MPX FIL 5.6kΩ 1500pF Line Out 1500pF 0.47µF 1 0.47µF AN7374K Rec. Out When users use this product, licensing contract should be made between the Dolby Research Center. Details should be contacted with the following. Dolby Research Center. Tokyo Office (Far Eastan Continental Inc.) TEL : 03-3584-0039 ICs for Cassette, Cassette Deck AN7374K, AN7376S Current consumption Current consumption 30 30 Encode Mode Ta = 25˚C Current consumption (mA) 26 24 C type 10kHz + 10dB 22 20 B type 10kHz + 10dB 18 16 14 C type Vin = 0 OFF 10kHz + 10dB B type Vin = 0 12 10 7 8 9 10 11 12 13 14 26 24 C type 10kHz + 10dB 22 20 B type 10kHz + 10dB 18 16 14 C type Vin = 0 OFF 10kHz + 10dB B type Vin = 0 12 10 15 7 8 9 10 11 12 13 14 15 VCC – Supply voltage (V) VCC – Supply voltage (V) B type encode characteristics C type encode characteristics – 40 VCC = 12V 10 Decode Mode Ta = 25˚C 28 VCC– Current consumption (mA) 28 20 VCC = 12V – 35 – 60 – 50 8 – 30 6 – 25 4 – 20 –5 100 200 500 1k 2k 5k 10k – 40 12 8 – 30 4 – 20 0 – 15 – 10 2 0 Encode boost (dB) Encode boost (dB) 16 0 20k 100 200 500 2.0 Encode Mode VCC = 12V 1.0 2.0 Encode Mode VCC = 12V 1.0 100Hz 1kHz 10kHz 0.2 0.1 0.05 0.02 10k 100Hz 1kHz 10kHz 0.5 0.2 0.1 0.05 –20 –10 0 10 0.01 –30 20 –20 –10 20 26 Encode Mode VCC = 12V 24 22 Signal handling (dB) 1.0 0.5 0.2 0.1 0.05 –10 0 Output level (dB) 10 Encode Mode f = 1kHz THD = 1% 20 18 16 14 12 10 100Hz 1kHz 10kHz 0.02 –20 10 Signal handling C type total harmonic distortion 0.01 –30 0 Output level (dB) Output level (dB) Total Harmonic distortion (%) 5k 0.02 0.01 –30 2.0 2k B type total harmonic distortion 5.0 Total Harmonic distortion (%) Total Harmonic distortion (%) NR OFF total harmonic distortion 5.0 5.0 1k Frequency (Hz) Frequency (Hz) 0.5 – 10 0 –4 NR OFF B type C type 8 20 6 7 8 9 10 11 12 13 VCC – Supply voltage (V) 14 15 20k ICs for Cassette, Cassette Deck AN7374K, AN7376S Crosstalk Crosstalk PB Mode to Rec. Mode VCC = 12V 30kHz LPF Rec. Mode to PB Mode VCC = 12V 30kHz LPF – 20 Crosstalk (dB) Crosstalk (dB) – 20 – 40 C type – 60 B type NR OFF – 80 – 60 – 80 – 100 – 100 100 200 500 1k 5k 2k 10k 20k 100 200 500 1k Frequency (Hz) Crosstalk Crosstalk PB Mode ch to ch VCC = 12V 30kHz LPF 10k – 40 C type – 60 B type NR OFF – 80 LPF C type B type NR OFF – 40 – 60 – 80 – 100 – 100 100 200 500 1k 5k 2k 10k 20k 100 200 500 Frequency (Hz) 1k 5k 2k 10k Frequency (Hz) S/N 100 CCIR/ARM PB IN to PB OUT (mode : PB, OFF) PB IN to Rec. OUT (mode : PB, OFF) Rec. IN to PB OUT (mode : Rec., OFF) Rec. IN to Rec. OUT (mode : Rec., OFF) Rg = 5.1kΩ 90 S/N (dB) Total Gain (dB) Total Gain 30 28 26 PB · B Rec. · OFF 80 PB · C PB · OFF 70 Rec. · B 24 22 60 Rec. · C 20 18 16 VCC = ± 6V 100 200 500 1k 2k 5k 10k 50 20k 7 8 NR control voltage threshold 10 11 12 13 14 15 NR control voltage threshold 20 20 Mode : NR OFF, B, C 18 18 16 16 14 Control voltage (V) Control voltage (V) 9 VCC – Supply voltage (V) Frequency (Hz) C type 12 10 8 B type 6 4 Mode : Rec., PBd, PBm 14 PBd (direct) 12 10 8 Rec. (MPX ON) 6 4 NR OFF 2 0 20k – 20 Crosstalk (dB) – 20 5k 2k Frequency (Hz) Rec. Mode ch to ch VCC = 12V 30kHz Crosstalk (dB) C type B type NR OFF – 40 7 8 9 10 11 12 13 VCC – Supply voltage (V) PBm (MPX ON) 2 14 15 0 7 8 9 10 11 12 13 VCC – Supply voltage (V) 14 15 20k ICs for Cassette, Cassette Deck AN7374K, AN7376S ■ Pin Description Pin No. 1 Pin Name GND Input Impedance Pin Voltage 0 Pin Description Equivalent Circuit Single Supply : Ground Pin VCC 2, 27 Rec. IN 62kΩ VCC/2 200Ω Record Input Pin 62kΩ GND VCC 60kΩ 3 OFF/B/C 70kΩ VCC/2 C-type/B-type/NR OFF Changeover Switching Pin 10kΩ GND VCC 4, 25 PB IN 40kΩ VCC/2 200Ω Playback Input Pin 40kΩ GND VCC 5, 24 MPX OUT 70Ω VCC/2 MPX Drive Amp. Output Pin 70Ω GND VCC 6, 23 MPX IN ≈∞ VCC/2 MPX Gain Aux. Amp. Input Pin 70Ω GND ICs for Cassette, Cassette Deck AN7374K, AN7376S ■ Pin Description (Cont.) Pin No. Pin Name Input Impedance Pin Voltage Pin Description Equivalent Circuit VCC 7, 22 VREF ≈0 VCC/2 Reference Voltage Output Pin GND VCC 8 IREF ≈∞ 1.2V Internal Resistor Error Calibration Pin 70Ω 700Ω GND VCC 9, 20 LINE OUT 40 VCC/2 40Ω Playback Output Pin GND VCC 10, 19 VCR H VCC/2 HLS Side Chain Control Resistor Pin 30Ω GND VCC 11, 18 RECT H 0.5V HLS Control Signal Smoothing Pin GND ICs for Cassette, Cassette Deck AN7374K, AN7376S ■ Pin Description (Cont.) Pin No. Pin Name Input Impedance Pin Voltage Pin Description Equivalent Circuit VCC 12, 17 VCR L VCC/2 LLS Side Chain Control Resistor Pin 30 GND VCC 13, 16 RECT L 0.5V LLS Control Signal Smoothing Pin GND VCC 14, 15 Rec. OUT 60Ω VCC/2 60Ω Record Output Pin GND VCC 50k 21 VRIN 25kΩ VCC/2 Reference Voltage Input/Ripple Rejection Pin 50k GND VCC 60kΩ 26 PB/Rec. /PBmpx 70kΩ VCC/2 Playback/Record/Playback – mpx MODE Switching Pin 10kΩ GND 28 VCC Supply Voltage Pin