CXA1917AM/AS Dolby∗ S type Noise Reduction Processor Description The CXA1917AM/AS is a bipolar IC designed for use in the Dolby S type noise reduction system (NR). An external operational amplifier is required to configure the decoder. The stereo Dolby B-C-S type NR combines use of a CXA1563M/S and two CXA1917AM/AS ICs. 30 pin SOP (Plastic) 30 pin SDIP (Plastic) Features • Considerable reduction in the number of external parts (half compared to CXA1417S/Q) • The same Dolby level as that of CXA1560 series ICs (–6dBm) Structure Bipolar silicon monolithic IC Absolute Maximum Ratings (Ta = 25°C) • Supply voltage VCC to VEE 17 • Operating temperature Topr –20 to +75 • Storage temperature Tstg –65 to +150 • Allowable power dissipation PD (CXA1917AM) 600 (CXA1917AS) 1200 Recommended Operating Conditions Supply voltage VCC VEE 4.5 to 6.5 –4.5 to –6.5 V °C °C mW mW V V ∗ This IC is available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications information may be obtained. ∗ "Dolby" and the double D symbols are trademarks of Dolby Laboratories Licensing Corporation. Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. –1– E95Y15B74 7 INPUT 6 GND C11 100n R10 27k 2% R14 16k 2% R15 VCT 2.4k 2% C19 1.8n R20 5.1k 2% 1 C21 1.8n HLSMP MC1 MC3 MC4 MC4IN 30 2 C16 0.22µ MCTC MC4 MC3DS MC3DT MC MC2 MC1 20k MC3IN 29 C7 100n ZHSH VCT 3 4 ZL2 LFVCR R19 39k 2% LFIN VCT 5 LFICG 17.5k 20k ANTSAT C38 1µ ZHSL 26 HLSOUT 27 LFDET 15k MCBO 28 C14 100n R16 39k 2% R12 C8 10k 22n C17 100n R9 39k C20 22n VCT C23 0.22µ 5 R31 13k 2% C30 2.2n R27 10k 2% TCL1 7 FHVCR SLVCR 8 R26 18k 2% VCT C34 8.2n C27 680p SCINH 9 10 20 C41 0.1µ TCF1H 11 FLDET SLDET TCS1L FHDET 21 C40 47n 19 TCF2H C43 0.47µ 10% 12 FHICG SHICG R46 33 TCF1L C44 0.1µ C46 0.22µ 10% R48 47 TCS2H FLICG SLICG TCS2L C42 0.22µ 10% R45 47 13 18 C48 0.1µ 10% TCS1H VREF & IREF TCF2L C45 0.47µ 10% R47 33 VCT IREF VCT 14 17 R28 24k 2% 15 16 VEE VCC 4 VCT 3 VEE 2 GND 1 VCC Note) Split Supply: Short VCT to GND Single Supply: Short GND to VEE and open VCT Tolerances of resistors are 5% without otherwise specified Tolerances of film capacitors are 5% without otherwise specified Tolerances of chemical capacitors are 20% without otherwise specified C31 8.2n FBOH V to I Conv H SHDET V to I Conv H 23 22 SCBOL FBOL R34 1.5k VCT SHVCR TCL2 FLVCR 24 RECOUT SCINL 25 6 R30 8.2k 2% C25 39n C29 470p R25 33 C26 1µ 10% RECOUT C24 39n –2– R24 10k 2% Block Diagram and Pin Configuration (Encoder Unit) CXA1917AM/AS CXA1917AM/AS Pin Description Pin No. Symbol (DCV values are for Vcc = 6.0V and VEE = –6.0V.) DCV (V) Equivalent Circuit Description VCC 1 HLSMP 0 1 HLS main path input VEE VCC 1.5k 2 2 MCTC –3.9 Time constant for the MC2 9.2k 2p VEE VCC 2.6k 3 3 ZHSH DC cut capacitance for the HLS/HF/SB detector 0 VEE VCC VCT 16k 4 ZL2 0 HF/LF/FB pass band rectifier input 4 GND –3– CXA1917AM/AS Pin No. Symbol DCV (V) Equivalent Circuit Description VCC 5 5 LFIN 10.2k 0 HLS/LF/FB-stage input GND VCC 1.5k 6 TCL1 –4.6 Primary time constant for the HLS/LF/FB detector 6 68k VEE VCC Secondary time constant for the HLS/LF/FB detector 7 7 TCL2 –4.6 300k 124k VEE VCC 500 8 SCINH 0 8 HLS/HF side chain input 500 VEE –4– CXA1917AM/AS Pin No. Symbol DCV (V) Equivalent Circuit Description VCC 9 FBOH 0 HLS/HF/FB VCR output 1.6k 9 22 5.1k VCT 22 FBOL 0 LLS/HF/FB VCR output GND VCC 10 10 TCF1H 0 Primary time constant for the HLS/HF/FB detector 80k VEE VCC 11 TCF2H Secondary time constant for the HLS/HF/FB detector –4.6 11 18 340k Secondary time constant for the LLS/HF/FB detector 22k 18 TCF2L –4.6 VEE VCC 12 TCS2H –4.6 2k Secondary time constant for the HLS/HF/SB detector 12 20 364k 46k 20 TCS2L 4k –4.6 VEE –5– Secondary time constant for the LLS/FB/SB detector CXA1917AM/AS Pin No. Symbol DCV (V) Equivalent Circuit Description VCC 13 13 TCS1H –4.6 Primary time constant for the HLS/HF/SB detector 80k 26k VEE VCC 2k 14 VCT 0 For dual power supply: Ground For single power supply: VCT 500 14 500 GND 15 VEE –6.0 For dual power supply: Negative power supply For single power supply: Ground 16 VCC 6.0 Positive power supply VCC 1.5k 17 IREF –4.8 17 Reference current input VEE VCC 1.5k 19 TCF1L –4.6 Primary time constant for the LLS/HF/FB detector 19 80k VEE –6– CXA1917AM/AS Pin No. Symbol DCV (V) Equivalent Circuit Description VCC 21 TCS1L Primary time constant for the LLS/HF/SB detector 21 –4.6 86k 70k VEE VCC 23 SCBOL LLS/HF side chain buffer amplifier output 1.64MEG 0 500p 500 23 24 500 24 SCINL 0 LLS/HF side chain input VEE VCC 25 RECOUT Recording (encoding) output 0 17.5k 200 500 20k 20k 25 28 47p 20p 200 500 2k 28 MCBO 0 MC buffer feedback VEE VCC 3.6k 26 26 ZHSL DC cut capacitance for the LLS/HF/SB detector 0 VEE –7– CXA1917AM/AS Pin No. Symbol DCV (V) Equivalent Circuit Description VCC 20k 27 HLSOUT 0 500 11k 26 27 47p HLS output 500 VEE VCC 22k 29 MC3IN 0 22k MC3 input 29 VEE VCC 30 MC4IN 0 30 MC4 input VEE –8– CXA1917AM/AS Electrical Characteristics (Ta = 25°C, Dolby level: –6dBm (= 388mVrms) at encoder input, Vcc = +6V, V EE = –6V) Measurement conditions Characteristics Symbol Min. Max. Unit ±6.5 V 15.0 20.0 mA 22.0 5.9 15.0 12.8 6.7 4.4 –2.9 –7.3 23.5 7.4 16.5 14.3 8.2 5.9 –1.4 –5.8 25.0 8.9 18.0 15.8 9.7 7.4 0.1 –4.3 dB dB dB dB dB dB dB dB 14.0 16.0 — dB — 0.01 0.15 % 62.0 65.0 — dB f (kHz) Input Other 1 15dB THD ≤ 1% ±4.5 No signal 10.0 Operating voltage VOPR Current consumption ICC Encoding characteristics (boost) (1) (2) (3) (4) (5) (6) (7) (8) EB-1 EB-2 EB-3 EB-4 EB-5 EB-6 EB-7 EB-8 Signal handling Vomax 1 Total harmonic distortion THD 1 S/N ratio SNR 2 0.05 0.3 12 0.3 2 0.05 12 –60 –40 –40 –40 –20 –20 0 0 THD = 1% 0 Rg = 600Ω CCIR/ARM –9– Typ. C11 100n R10 27k R15 2.4k R14 16k C19 1.8n R20 5.1k C21 1.8n C16 0.22µ C7 100n C17 100n ZL2 4 R16 39k 6 LFIN C20 22n C24 39n 7 TCL1 R19 39k TCL2 5 C23 0.22µ R24 10k SCINH 8 C27 680p R26 18k C31 8.2n FBOH 9 C41 0.1µ C48 0.1µ 1 C43 0.47µ C46 0.22µ 15 TCF1H 12 TCF2H 11 TCS2H 10 14 2 MC4IN HLSMP 13 MC3IN MCTC R23 33 C26 1µ MCBO ZHSH 3 16 17 18 19 20 21 22 23 R28 24k HLSOUT C45 0.47µ 24 C44 0.1µ ZHSL C42 0.22µ 25 C40 47n RECOUT 26 C34 8.2n SCINL 27 R34 1.5k SCBOL 28 R31 13k FBOL 29 C38 1µ TCS1L 30 C8 22n C30 2.2n CCIR/ARM TCS2L TCS1H R9 39k R30 8.2k R27 10k TCF1L R12 10k C25 39n Distortion Anaryzer TCF2L VCT – 10 – VEE Signal Genarator IREF C14 100n VCC C29 470p Electrical Characteristics Measurement Circuit A 3 VEE (–6V) 2 GND 1 VCC (+6V) Noise Meter CXA1917AM/AS – 11 – C2 33µ R2 1.5k C3 33µ C11 100n R10 27k ENCODE R3 1.5k R1 22k R15 2.4k R14 16k C19 1.8n R20 5.1k 2 HLSMP C21 1.8n MCTC 1 C16 0.22µ ZHSH C17 100n 4 R16 39k 6 LFIN 5 C24 39n 7 TCL1 R19 39k C20 22n TCL2 R24 10k 8 R26 18k C27 680p 9 10 C41 0.1µ 11 C43 0.47µ 12 C48 0.1µ C46 0.22µ 15 3 VEE (–6V) 2 GND 1 VCC (+6V) (–6dBm) 5 RECOUT (–6dBm) 6 LINEOUT Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. 3 C23 0.22µ MC4IN 14 MC3IN 13 16 17 18 19 20 21 22 23 24 R28 24k 25 R48 47 R47 33 C45 0.47µ 26 R46 33 C44 0.1µ 27 C31 8.2n R45 47 C42 0.22µ 28 C7 100n C40 47n 29 C34 8.2n MCBO 30 R25 33 C26 1µ R34 1.5k HLSOUT SCINH C1 4.7µ R31 13k ZHSL FBOH R4 12k DECODE C38 1µ RECOUT TCF1H (–25dBm) R5 12k C8 22n SCINL TCF2H 7 R9 39k C30 2.2n SCBOL C9 4.7µ FBOL TCS2H INPUT R30 8.2k R27 10k C4 4.7µ TCS1L C14 100n TCS2L ZL2 TCF1L R12 10k C25 39n C29 470p TCF2L TCS1H IREF VCT VCC VEE Application Circuit CXA1917AM/AS CXA1917AM/AS Notes on Application The CXA1917A is an encoding IC for the Dolby S type (NR). An external operational amplifier is required to configure the decoder circuit. The Dolby level voltage of this IC is designed to be –6dBm (388mVrms), which is the same as that of the CXA1562 and CXA1563 Dolby B-C type ICs. Therefore, it is possible to use the CXA1562 or the CXA1563 to configure a B-C-S type switchable processor. The B-C-S type switchable processor can be configured without requiring an external operational amplifier because the CXA1563 has a built-in S-type changeover switch. Power Supply The CXA1917A will operate with either dual or single power supply. Connect VCT pin to GND pin when dual power supply is used. Connect VEE pin to GND pin and open VCT pin when a single power supply is used. The power supply half the Vcc generated inside the IC is generated at VCT pin. The supply voltage range is from ±4.5V to ±6.5V and from 9V to 13V for dual and single power supplies, respectively. Note, however, that the minimum supply voltage is determined by the maximum voltage amplitude of external operational amplifier. Because general-purpose operational amplifiers have the maximum voltage amplitude of approximately (Vcc – VEE) –2V, actual minimum supply voltages, which satisfy the 15dB overload margin, are ±5.0V and 10V for dual and single power supplies, respectively. The supply current does not depend so much on the supply voltage, but does depend on the signal level and frequency. The maximum supply current in the worst case is approximately 25mA. Recording Processor Fig. 1 shows the recording processor. The gain is defined as follows: GREC20 · Log (1 + R62/R63) ...... (1) The processor in Fig. 1 has a gain of 14dB, therefore, input sensitivity is –20dBm (77.5mVrms). An input sensitivity higher than –25dBm (44mVrms) is generally unacceptable due to noise performance, although this is affected by the operational amplifier in the input circuit. An important characteristic for the external operational amplifier is the noise performance for approximately an input impedance of 20kΩ. A bipolar input type will be better than the JFET input type for the recording processor. Playback Processor Fig. 2 shows the playback processor. The gain is defined as follows: GPB20 · Log (1 + R64/R65) ...... (2) The processor in Fig. 2 has a gain of 20dB, therefore, the input sensitivity is –26dBm (39mVrms). Important characteristics of the playback processor are the frequency response and the feedback loop stability, which depend on the gain of the feedback loop gain and the slew rate of the external operational amplifier. The slew rate has to be higher than 3V/µs. The loop gain can be estimated using the gain bandwidth product BG (Hz) of the operational amplifier and the decode gain APB. The lower limit of BG/APB is approximately 500kHz, and the recommended range is from 1 to 3MHz. Switchable Processor Fig. 3 shows the switchable processor. The gains are the same as in equations (1) and (2). An operational amplifier is required with low noise, average slew rate (> 3V/µs), and wide bandwidth (≈ 10MHz) for this gain setting. A bipolar input type operational amplifier with a wide bandwidth like those of the 4560 and the 4570 is required of the switchable processor. The processor in Fig. 3 may generate a significant switching noise, especially when S2 switch is make-breakmake type. When S2 switch is a make-to-make type or has a quick switching feature, the switching noise will be within the range acceptable for cassette decks with output muting circuits. – 12 – CXA1917AM/AS B-C-S Type Switchable Stereo Processor Fig. 4 shows the stereo processor switchable to any B-C-S type mode. The operational amplifier is unnecessary, because the CXA1563 is used for a B-C type processor and S-type changeover switch is built in the IC. It is recommended that the S type mode be used for recording level calibration. C61 4.7µ RECOUT (–6dBm) 5 C62 4.7µ LINEOUT (–6dBm) 6 RECIN (–20dBm) 1 VCC VCC 1 C63 2.2µ 5 RECOUT 7 A1 2 GND VEE 3 3 VEE 6 GND R61 56k GND R63 3k GND 2 7 INPUT VCT 4 R62 12k 4 VCT Encoder Unit VCT Fig. 1. Recording Processor C62 4.7µ LINEOUT (–6dBm) 6 1 VCC R64 18k C64 2.2µ PBIN (–26dBm) 8 VCC 1 5 RECOUT A1 GND 2 2 GND VEE 3 3 VEE 6 GND R61 22k GND R65 2k 7 INPUT VCT 4 4 VCT Encoder Unit VCT Fig. 2. Playback Processor C61 10µ RECOUT (–6dBm) 5 LINEOUT (–6dBm) 6 PBIN (–26dBm) RECIN (–20dBm) C62 10µ R64 18k C63 2.2µ 8 7 1 VCC VCC 1 5 RECOUT A1 S1 R61 56k 6 GND GND S2 7 INPUT GND 2 2 GND VEE 3 3 VEE VCT 4 4 VCT R65 2k R63 3k R62 12k Encoder Unit VCT Fig. 3. Switchable Processor – 13 – CXA1917AM/AS REC OUT1 LINE OUT1 13 14 C13 1µ C16 1µ Encoder Unit 1 5 RECOUT PBIN1 12 GND 6 GND GND 2 GND VEE 3 7 INPUT VCT C11 1µ VCT 4 MPX OFF C12 1µ 22 21 LINEIN1 LINEOUT1 SIN1 18 16 15 VCC 26 MODE 27 PBIN2 LINEIN2 LINEOUT2 SIN2 RECOUT2 SSW NRSW GND CXA1563 C21 1µ 2 3 7 8 11 12 13 14 C22 1µ LINEIN2 21 GND 6 GND 7 INPUT 2 GND B/C OFF B 3 VEE 4 VCT C VCC 1 5 RECOUT GND 2 PBIN2 22 VCC GND S Encoder Unit 2 1 MPX ON RECOUT1 28 PBIN1 PB VCT LINEIN1 11 VCC 1 GND VEE 3 VCT 4 C26 1µ C23 1µ 23 24 LINEOUT2 RECOUT2 Fig. 4. B-C-S Switchable Stereo Processor – 14 – CXA1917AM/AS Example of Representative Characteristics Current consumption vs. Supply voltage Current consumption vs. Input level 18 18 ICC – Current consumption [mA] ICC – Current consumption [mA] No signal 16 14 12 10 12 1kHz 100Hz 14 14 16 –10 0 Encoding input level [dB] Encoding characteristics Total harmonic distortion characteristics Total harmonic distortion [%] –60dB –50dB VCC = +6V VEE = –6V 0dB = –6dBm –40dB 15 –30dB 10 –20dB 5 –10dB 0dB 0 +10dB 1.0 VCC = +6V VEE = –6V 0dB = –6dBm 100Hz 0.1 1kHz 10kHz –5 –10 10 VCC – VEE – Supply voltage [mA] 25 Encoding boost [dB] 10kHz 16 12 8 20 VCC = +6V VEE = –6V 0dB = –6dBm 30 100 300 1k 3k 0.01 30k 10k –10 –5 Frequency [Hz] 0 5 10 15 20 Output level [dB] Overload margin vs. Supply voltage Ripple rejection –10 Ripple rejection [dB] Overload margin [dB] 20 VCC = +6V VEE = –6V 0dB = –6dBm f = 1kHz 15 10 –20 VCC – VEE = 12V Vripple = –20dBm Encode Mode VCC (Dual Supply) VCC (Single Supply) C = 47µ (14pin) –30 Overload margin: Encoding input level when 1% of total harmonic distortion is generated at the encoding output 8 10 12 14 VEE (Dual Supply) –40 16 30 100 300 1k Frequency [Hz] VCC – VEE – Supply voltage [V] – 15 – 3k 10k 30k CXA1917AM/AS Package Outline Unit: mm CXA1917AM 30PIN SOP(PLASTIC) + 0.4 2.3 – 0.15 + 0.4 18.8 – 0.1 0.1 30 16 (9.3) 0.5 ± 0.2 + 0.3 7.6 – 0.1 10.3 ± 0.4 + 0.2 0.1 – 0.05 A 15 1 + 0.1 0.2 – 0.05 1.27 0.45 ± 0.1 0.2 M 0° to 10° DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SOP-30P-L03 LEAD TREATMENT SOLDER PLATING EIAJ CODE SOP030-P-0375 LEAD MATERIAL 42/COPPER ALLOY PACKAGE WEIGHT 0.7g JEDEC CODE CXA1917AS + 0.1 05 0.25 – 0. 30PIN SDIP (PLASTIC) + 0.4 26.9 – 0.1 10.16 + 0.3 8.5 – 0.1 16 30 0° to 15° 15 1 0.5 ± 0.1 + 0.4 3.7 – 0.1 3.0 MIN 0.5 MIN 1.778 0.9 ± 0.15 PACKAGE STRUCTURE SONY CODE SDIP-30P-01 EIAJ CODE SDIP030-P-0400 JEDEC CODE MOLDING COMPOUND EPOXY / PHENOL RESIN LEAD TREATMENT SOLDER/PALLADIUM PLATING LEAD MATERIAL COPPER ALLOY PACKAGE WEIGHT 1.8g – 16 –