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SONY. _CX20188/CXA1098Q DO Dolby B-C Type Noise Reduction System reer Description Package Outline Unit: mm CX2018B/CXA10980 are ICs designed for use in cxzo188 42 pin SDIP (Plastic) Dolby B and C type noise reduction systems. These ICs offer complete stereo Dolby B and C type noise reduction with just one IC and a few external ate! ki components. These devices provide inductorless ; ~ - - spectral skewing circuits and excellent low distortion ADRADAARALARRABARARAL 5 ry characteristics, and are suitable for use in high grade h, 4 Pe errors cassette decks and high grade automotive a i equipments. s sa7eses _ Features = Ia] + Spectral skewing circuits with inductorless 3 3 structure = * Very low distortion astea 3 (0.002% typ. 1 kHz +10 dB in NR OFF) agi E + Dual channel processors in one chip SDIP-42P-02 + Programmable input and output levels 7 + Low supply current (16 mA typ. in NR OFF) CXA108680 48 pin OFP (Plastic) or72 1% Structure arz0'&t ais abs Bipolar silicon monolithic IC. iy ie ° Hnoqnngaaua pore Absolute Maximum Ratings (Ta=25°C) = =r + Supply voltage Vec 22 Vv =| = + Operating temperature Topr -30 to +85 °C | Sd = + Storage temperature Tstg —55 to +150 °C — — + Allowable power dissipation — = ry 192 CxX20188 Pp 2200 mW MT TTT saa CXA1098Q Pp 600 = mw TET | 4 sogs}|!? 3 EE ; OFP-48P-LO1 Note) These ICs are available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and application information may be obtained. “Dolby” and double D symbols are trade marks of Dolby Laboratories Licensing Corporation.

X20188/CXA10980, SONY=s eee NN Block Diagram and Pin Configuration vee +4) Ver w REC IN~1 (2) G) REC IN~2 s Ey " 1 REF Q) | Sean : . van ai E erSyi, fairy a a LU proms PS Fes eget BEE B CAL/REC/PB @) mall 1 69 OF F/87C i dnc PB FB-1©—— ot PB FB-2 PB FB-2 ~x \\ er ee Se ee on | OFF/B/c @ \\ €9 TeL 1-2 REC FO-1 . P4 ¥ 4 REC FB~2 ve wed =5 A Ke wri-e S I, 63 ~ : LINE OUT-1 (9 ©) LINE OUT-2 Oe [] Lo - “db = * mews Tie [fer ) [os pene SSK-1 (do 7 ay SSK-2 vee © | G) REC OUT-2 VF IN-1 ¢) 3 VF IN-2 vec @) 69 REC OUT-1 ts Te =) pfs] [a KG HPF A-1@ey 3 6) HPF H-2 REC IN-t Py = — aw ANTS TeH 1-16) » Led ToH 1-2 PB IN-1 ie, os M Num || es camera '% SS drei WT H-1@> = 89 WT H-2 ? PB FB-1@ (+ ] GNC re art er Cy ToLa-e 8-O-O+90-0-B-2-2)-0)--0-B Tet 1-1@ 6 Te 1-2 eee ET 2 Sr TII_ wr L-1@ aPOwre-z 8 ia s eee B pil Es « Zz MPF me) 4 a pee ia ANT 1 a 3 rf ANT S~2 REC OUT-1@> @3 REC OUT~2 cXA10980 x20188

X20188/CXA10980 SONY. Eee Pin Description | 1 [7 | vec | Positive power supply [241 | se | recin | Recording input | 3 | 9 | incr | Reference current source [a3 [a 10 | RB IN| Playback input | 5 | 11 | cavrecype | Calibration/recording/playback switching | 637 | 1.12 | rere | Playback feedback [7.36 | 13,48 | REC FB | Recording feedback | 8.35 | 14,47 | GNo | With split supply: GND, with single supply: Vec/2_| |_9.34 | 15.46 | Line our _| tine output (decode outpu) [10.33 | 16,45 | ssk | Spectral skewing switch |t.a2 | 17.46 | vein “| encode circuit input | 12.31 | 20,41 | HPF H | HIS high-pass finer [13.90 | 21,40 | ToH2 | MIs aetector ime convient 2 [17,26 [26,38 | ToL 1 | US detector sme constant) SS j.18.25 | 27.94 | wrt | usweighting [19.26 [2633 | Her. | Us highpass er ——SSSCSC~C~*~S~* | 20.23 | 29,32 | ANTS | Antisaturation | 21.22 | 30,31 | nec ouT | Recording output (encode output) | |_3@ | 2 | oFr/e/c | Dolby NR of/B-type/C-type switching | | ao | 4 [| caw | Calibration input . pe fos | oe | With split supply: negative power supply, with single supply: GND

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oe eeeeeeeeeeeeeeSSSSSSSSSFSFSeFesFeFSeFeeeee €X20188/CXA10980 SONYs $a SSSSSSSSSSSSSA NIN Electrical Characteristics Ta=25°C, Vec=10V, Vee=—10V unless otherwise specified. Dolby Level: —10 dBm (=245 mVrms) at REC OUT Characteristic | Symbo! [we | wn | {(H2) Typ. Unit Condition Operating Vopr Split 4.0 10.5} Vv voltage*2 Pt Single 8.0 21.0} V Encode characteristic (Boost) B-type (1) B-R-1 R B 500 —25dB 1.9 | 29 | 3.9 GB (3) B-R-3 R B 5k —25dB 44] 54 | 64 dB C-type (1) C-R-1 R c 500 —60dB 15.0) 16.2] 17.4] dB {2) C-R-2 R c 500 ~250B 8.0 | 9.2 1104] dB {3) C-R-3 R c 2k —60dB 19.7 | 20.7 | 21.9] dB (4) C-R-4 R c 2k —250B 6.2 7.4 8.6 dB (5) C-R-5 R Cc 5k -250B 4.3 5.5 | 6.7 dB (6) C-R-6 R Cc 10k OdB —4.7| -3.6 |-2.3| dB Frequency OFF Refer to response 1kHz Signal THO=1% Total harmonic distortion NR OFF THD{OFF) OFF +10dB 0.002}0.05 | % B-type THD(B) B +10dB 0.02 |0.05; % C-type THD(C} c +10dB 0.05 | 0.10] % C-type encode Rg=5kN S/N ratio SNICCIR) | a | c | - | (CCIR/ARM) Crosstalk ; REC-PB CT-1 P OFF 1k OdB -1t00| -70] 4B PB-REC CcT-2 R OFF 1k OdB ~97 | -70| dB REC ch to ch] CT-3 R OFF 1k OdB —86 | -65] dB PB ch to ch CT-4 P OFF tk OdB —85 | -65] dB

X20188/CXA10980 SONY: eSSsSSSSSSSSSSSsSSSSSSSSSSeeeessseseSSessSSSSssssSSsSSEeeee Characteristic | Symbol! Other Typ. Unit H R/P co {Hz} Condition REC OUT Offset Voltage Vott Cc mV (C-type- OFF) Control Voltage “H" level VC-H - 3.0 Vec Vv “M" level vc-M - -0.7 0.7 Vv “L" level VC-L - Vee -3.0| v Note) *1. 0 dB means the level which provides the Dolby level at the recording output in the noise reduction off mode. *2. Modification of the external components value should be required for low voltage condition. *3. Single supply operation. *4. The reference level of the line output is 0 dBm (775 mVrms).

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©x20188/CXA10980 SONY. Quiescent current vs. Supply voltage Supply current vs. Input level FS A Li} tT | Pt comme fT | || 3 st veg =-t0v PUT) EEA plore Tt | Pa : 3 > a ene PEER Pres. pit tee. et gust OT Tee EE) | operas ame : — pnt I 2 2 SS A Taz oe pee LOE ‘ Het + fF] PT c s 70 rr) rr Voc - Vee - Supply voltage (Vv) Input tevel (dB) B type encode characteristics C type encode characteristics [beer TTT TUTE) [Pt TE ee] ae ec Ze) TiN rani ‘jin ee | e JUIN UMP II) TTI a PE | EMC RC Teas) PNT i rea! TN i eames i WZ CTS we © LU et : yaoi BTN

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Frequency (Hz) Frequency (H2)

€X20188/CXA1098Q SONY. oo SSSsSseeeeSsSsFFseeeeeSeSSSSSSSSSSSSSE NN B type temperature characteristics C type temperature characteristics T Veo = 210V [| r dfvecrvo TUT | [eee] [eer [Tee] I Veg =-10V || Axes 0.48 = Dolby Level yam SS 0.d8 = Dolby Level Ei og | ee —! ‘ _ seen Tos 25°C LATS. 8 . mr Bie. GIS. <t- pH TL ee le ao i WA cae i. PETS PLLA abies! 9 (I ea TP 8 | avis i fpcetttits. < 5 | LL oa i Jj) _ 2a 2 = antl a aes pa imate ORO IN ‘ rat NE i aa VEN ECO CTT EEC Pe Frequency (Hz) Frequeney (Ha) NR OFF total harmonic distortion B type total harmonic distortion Encode Mode ,

2 Vee” 10V fo fe == [=F Veg =—tov == f

: FS 0B Dolby Level we =| ® EF oaa= dolby tevel = f ;. Line Out Reference Level ~~) tJ —- 5 cos] mi = 0.8m W776 cmveme) a : oF se te arenes reve = a : = al . z | SSE £ RS == = or ee As mF] : Se = ts, - SSS] ieee =H 100 He ns = “EEE SS SS SSS SE SS a ar a a a Output level (dB) ‘Output level (dB)

€X20188/CXA10980 SONYe a eSeSSSSSSSSSeSSSSSSeSeeeSeSSssSSssFSeeeeeeeseseeSeSSsSSSSeseSeee EP C type total harmonic distortion Drive capability eestor very | fT tT Veo = +10V | vol Veg «10 BF ode = dolby Level 4 E | tHo~1% Line Out § Line Out Reference Level HH 3 ne I I | Pee Cer os] CR 2 IZ f URNS] | Tt 4 2 ofp Pe tt 2° H So a oe or | | § a = —ai= £ § Cees {ae EY re A a A 0 a ts ° a ry oe Output level (dB) RL - Loed resistance (ki) Maximum line output level Recording output overload margin P| | | tty Sat Val 20) ash THD = 1% ZI 8 |_| 5 Z| ptt | Py tL | =" 7 : 20) Wi

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€x20188/CxXA10980 SONY. SSS UN 8 Channel to channet crosstalk Recording and play back crosstalk Voc = +10V | Voc = +10V l wal tt] VEE™ ~10¥ aol tL] Vee = -10V Line Out Reference Level = 0 dBm Line Out Reference Level = 0 dBm Rec In Reference Level = 25 dBm Rec In Reference Level = —25 dBm | TT ell LUT TTT Fy wall 44. 3 + + iil 0 Ht 3 a PME er a Za oo pall - He Zag HE TAT | eT aril] wai /—Jencode Ho | Hr ec to Pe WALI Pri “TE eel ii 08 wo Fa Tor 100 308 ¥ Fr 3 Frequency (Hz) Frequency (Hz) Control threshold voltage (1) Control threshold voltage (2) edi... | Vee [| ff TT Tyvee TT i Decode (PB) C type | po oe | [st __ : Rise ty 2 ' 8 & Vee= +10v | 8 Veo* +10V 8 ; Vees-tov | g Veg = -10V Bo T+ —-g type Eo Encods (REC) £ r—t é or | ett i | QP --f-- “4 i = || [REnieS= 5) NR OFF veel Ta - Ambient temperature (°C} Ta- Ambient temperature (°C)

X20188/CXA10980 SONY. SS UN XO Ripple rejection ratio (1) Ripple rejection ratio (2} NSS Bvrrtraabcotres LIN. Py Tne veg BY x < HL BS He ceed HIS lt Fy Sy = i NEI SUIT NSUTTIN esau |g UTE NTR. i Na : NUS § th Pei SS a) C type | g« Ni uy BUT TTT Tir) UIE TTTNIN S077 £ 4 Th t x Sy 2 2 BL Meceta TT) 0g [Messtod TITS = x Vee =—10V = Pr Vvee=—10V Line Out Reference Level = 0 dBm Line Out Reference Level = 0 dBm til Rec tn Reference Level = —25 dBm we T Rec In Reference Level = —25 dBm Hie 8 ro 3 cs 0 7 ™ we co Frequency {Hz} Frequency (Hz) Ripple rejection ratio (3) Ripple rejection ratio (4) (lee Lee EY P 29] — WE ee TTT SSS 3° aie 3" oy St oe as | = ot NO = [Co ARS TTS) & type ni a Rail BU ETAT TTI) TN TIT SS a 7 Til i io el | 2 s © tt Voc +10v © wot) Voc=+10V [Peewee (I) UES cea Il

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Frequency (Hz) Frequency (Hz)

©X20188/CxA10980 SONY. SSSA UN YS Notes on Application 1) Power Supply The CX20188/CXA1098Q are designed to operate on either single ended supply or split supply. The operation range of the supply voltage is {a) Single ended supply operation: 8 to 21 Vv (b) Split supply operation 144 to +105 V For the low supply voltage condition these devices require to change the capacitances of the low level stage detectors as shown in Fig, a-1, t High voltage condition 620,40 above +12V or +6V supply C20, C40=68 nF wyizer Low voltage condition Tout below +12V or t6V C20, C40=0.1 uF Fig. a-1 For the single ended supply operation these devices generate the signal grounds of half the supply voltage. Independent two signal grounds are provided for each channel. These pins should be connected bypass capacitors independently. External connection between the signal grounds may save the bypass capacitor, however, low frequency channel separation will degrade even though acceptable. A usefull feature of these devices is the provision for programmable line output structure, which will permit an optimum overload margin for various supply conditions. The overload margin therefore depends on both of the supply voltage and the line output reference level. Table a-1 shows the maximum line output reference levels to satisfy overload margins of 12 dB and 15 dB, 12 dB of the overload margin is the minimum value specified by Dolby Laboratories. Overload Margin 8V (+4V) ~—3.0dBm (548mVrms)|—6.0dBm {388mVrms) 10V (£5V) ~0.5dBm (731 mVrms)| —3.5dBm (518mVrms) 12V (+6V/) 1.5dBm (921mVrms) | —1.5dBm (652mVrms} 15V (£7.5/) 3.5dBm (1.16Vrms) | 0.5dBm (820mVrms) 20V (410V) 6.0dBm (1.55Vrms) | 3.0dBm (1.09Vrms) Table a-1 Maximum line output level

©X20188/CXA10980 SONY. ee SSFSsSSSSSSSSSSSSSSSSSSSSSSsSSSSSSSSSN EE 2) Operation mode control The CX20188/CXA10980 provide fully electronic switching circuits. The functions are controlled by DC voltage of the two control pins of CAL/REC/PB and OFF/B/C. The switching truth table are shown in Table a-2. The switching levels are as follows (a) Single ended supply operation Vec/2+0.7V & VM 2 Vcc/2-0.7V Vec/2 is not mathematical half of the supply voltage but the potential of the (b) Split supply operation upely operation | | Function | ¢ type | B type [NR OFF | O7V 2VM2-07V Table a-2 Switching truth table ~3V 2 VL2 Vee The CAL (Calibration) mode is provided for the recording level and frequency response calibration functions of high grade cassette decks. It may also be used as an input muting function also.‘ This mode functions as the encode mode basically, (and selects CAL pin for the input pin. . It is desirable to provide CR time constant circuits at CAL/REC/PB and OFF/B/C pins with time constant from 100 msec to 1 sec, which will reduce switching clicks effectively,

€X20188/CXA10980 SONYe SSSA ON XD 3) Reference Levels Characteristics and specifications of the Dolby noise reduction processor are defind and measured with reference to the Dolby level. This particular level in these devices is —10 dBm {245 mVrms), and is measured at the Test Point (VF IN) of the recording otuput (REC OUT). The input and output reference levels, which provide the Dolby level atthe Test Point or the recording output in the NR off mode, are Programmable with the external circuit. The CX20188/CXA1098Q provide inductorless spectral skewing circuits, which are composed of a bootstrapped bridges-T circuit as shown in Fig. a-2. Resistors of R17 and. R18 compose an attenuation circuit to determine the line output (LINE OUT) reference level. In Fig. a-2 the attenuation factor Hssk is defined as Hssk=20 « Log (1+R17/R18) The line output reference level becomes Line output reference level =Hssk—10 [dBm] The parallel combination of R17 and R18 has to maintain a constant value to keep the specified spectral skewing characteristics, This particular resistance is 1.78 kQ for 2.2 nF capacitance of C13 and C14. Table a-3 shows the usefull combinations of R17 and R18 for various applications. applications. oe Ee ne out Level Voltage ung ovt mee out & —0.2dBm | 211.0V i i ++ “ae —2.3dBm | 29.0V i 9a rs 3.3kn ~4.7dBm war Ris sa i Fig. a-2 Table a-3 Spectral skewing circuit Fig. a-3 attenuation The reference level of the recording input (REC IN) and the play back input (PB IN) depend on the feedback factors of an operational amplifier MOA, which is an input switchable operational amplifier. In the recording mode the operational amplifier MOA composes the fixed gain amplifier with the feedback path of R15 and R16, and drives the encode Processor. In the play back mode the output of the encode processor (REC OUT) is fed back to the inverting input (PB FB) of the operational amplifier. The transfer function of the operational amplifier therefore becomes the inverted transfer function of the encode processor, and operates as the decoder. The reference levels of the recording input (REC IN) and the play back input (PB IN) are as follows Recording input reference level=Line output reference level—Hrec [dBm] Play back input reference level=—10—Hpe [dBm] where, Hnec and Hrs are the feedback factors in the encode mode and decode mode respectively, Hrec=20+ Log (1+R16/R15) Hps=20 + Log (1+R14/R13)

€X20188/CXA 10980 SONY: SSS IN Increase of the recording input sensitivity will degrade the overall noise reduction effect, which has to satisfy more than 17 dB of the specified minimum value. A recommendable recording input sensitivity is approximately -25 dBm (44 mVrms). The range of the allowable play back input sensitivity will be limited by the open loop gain and the phase margin in the play back mode. A recommendable range of the play back input sensitivity if from —32 dBm (19 mVrms) to —25 dBm (44 mVrms). 4) Notes on Application . Application circuits of Fig. a-5 and Fig. a-6 show capacitors of C25, C26, C45 and C46 in the LLS and HLS weighting circuits. We guarantee the encode error specified in the data sheet without these capacitors. However, we recommend to include the capacitors for three head cassette decks in which independent Processors are provided for encode and decode Processors respectively. For exaniple, combination of a device with positive error and a device with negative error may generates significant frequency response error, even if the devices are within specified Simit. These capacitors will improve the encode error due to offset voltages of the level detectors. (a) Encode Processor with Split Supply (Fig. a-5) will reduce the encode error. Supply voltage :£8Vtyp. (£6 to +10VY) Line output level 10.2 dBm (753 mVrms} Recording output level: —10 dBm (245 mvrms) Recording input level :—24.3 dBm (47 mVrms) This circuit is suitable for three head cassette decks. {b) Decode Processor with Split Supply (Fig. a-6) Supply voltage 7£8Vtyp. (+6 to +10VY Line output level +—0.2 dBm (753 mVrms) Play back input level :—30 dBm (25 mVrms} This circuit is suitable for three head cassette decks. (c) Switchable Processor with Split Supply (Fig. a-7) ; Supply voltage :tBVtyp. (£6 to +10V) Line output level 1-0.2 dBm (753 mVrms) Recording output level: —10 dBm (245 mVrms) Recording input level :-—24.3 dBm {47 mVmms) Play back input level :—30 dBm (25 mVrms) This circuit is suitable for high grade two head cassette decks. (d) Switchable Processor with Single Ended Supply (Fig. a-8) Supply voltage 1+14V typ. (9 to 20V¥y* Line output level 12.3 dBm (596 mVrms) Recording output level: —10 dBm (245 mVrms) Recording input level :—24.6 dBm {46 mVrms) Play back input level :—30 dBm (25 mVrms) This circuit is most appropriate for general applications. * Note) Change C20 and C40 to 0.1 BF when Vcc is below +12V.

ee SSSSSSSSSSSSSSSSSSSSSSSSSSSSSS €X20188/CXA10980 SON Ye a a te nad {e) Decode Processor with AUX input (Fig. a-9) . Supply voltage :+9V typ. (8 to 20V)" Line output level 24.7 dBm (452 mVrms} Recording output level : —10 dBm (245 mVrms) AUX input level :-30.2 dBm (23 mVrms) Play back input level :~—30 dBm (25 mVrms)} This unique application providing AUX input is suitable for car stereo players and car stereo cassette decks. AUX input will be usefull for a tuner input. CAL/REC/PB switching operates as the switching of AUX/Tape. The operation in the AUX input mode is independent of the switch position of OFF/B/C. When AUX input is unnecessary, C2, C11, C31, R3, R11, R31, R15, R16, R35 and R36 can be omitted. Refer to Fig. a-6. * Note) Change C20 and C40 to 68 nF when Vec is upon +12V. (f} Application for Dubbing Cassette Decks The CX20188/CXA1098Q simplify the structure of dubbing decks. Conventional dubbing decks utilize the Dolby processors commonly for two systems. Problems occur on the dubbing mode of a Dolby ‘NR encoded tape. Listeners will be forced to monitor non- decoded sound. This device offers a simple solution, which is to utilize the recording output signal in the play back mode as shown in Fig. a-4. In the dubbing mode the processor Operates as a decode (play back} mode. The monitor (line output} signal from the deck A will be decoded if necessary, however, the deck B will record directly without decoding. This special application is possible because this device generates a non-decoded signal at the recording output in the decode mode even though it operates on the B type or C type NR. Application for Dubbing Deck LINE IN LINE OUT REC/PB (PB) PB CAL DOLBY NR LINE OUT i mo cx20168 REC OUT de PB IN on PB CAL LJ REC CAL Fig. a-4

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Product Information

CX20188 specifications and overview.

Summary

DOLBY B-C TYPE NOISE REDUCTION SYSTEM

Description

DOLBY B-C TYPE NOISE REDUCTION SYSTEM

Source title CX20188 Datasheet(PDF) - Sony Corporation

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