TOSHIBA TC9237BF/BN TENTATIVE TOSHIBA CMOS DIGITAL INTEGRATED CIRCUIT SILICON MONOLITHIC TC9237BF, TC9237BN =-A MODULATION SYSTEM DA CONVERTER WITH BUILT-IN DIGITAL FILTER TC9237BF, TC9237BN are a 2nd order >-A modulation TC9237BF system 1bit DA converter with a built-in 8 times over- sampling FIR type digital filter developed for digital audio equipment. As the de-emphasis function has been incorporation, it is possible to configure the system for digital filtering through analogue output at a low price. FEATURES SOP28-P-450-1.27 Built-in 8 times over-sampling FIR type digital filter. 19237BN Over-sampling ratio (OSR) is 192fs. Built-in digital de-emphasis filter. Simultaneous outputs to L-ch and R-ch. Compatible with fs=32k, 44.1k, 48kHz. Compatible with double speed operation. SDIP28-P-400-1.78 Characteristics of the digital filter and DA converter are : as follows : Weight SOP28-P-450-1.27 : 0.8g (Typ.) DIGITAL FILTER (fs = 44.1kHz) SDIP28-P-400-1.78 : 2.2g (Typ.) PASS-BAND | TRANSIENT | STOP-BAND DIGITAL FILTER RIPPLE | BAND WIDTH | SUPPRESSION Standard operation 8fs +0.041dB | 20k~23.5kHz - 55dB Double speed operation Afs +0.026dB 20k~24.1kHz - 49dB DA CONVERTER NOISE OSR DISTORTION S/N RATIO Standard operation 192fs - 87dB (Typ.) 98dB (Typ.) Double speed operation 96fs - 87dB (Typ.) 98dB (Typ.) @ 2 Kinds of package, 28-pin flat package and 28-pin DIP shrunk package. It is possible to construct a system in simple structure using the filter IC (TA2009P, TA2009F) dedicated to +5V single power supply operation. 1 2001-06-19TOSHIBA TC9237BF/BN PIN CONNECTION M/L MUTE TESTI VDA RO RO GNDA GNDA Ka} LO VDA TEST2 TEST3 GNDD 1 2 3 4 5 6 7 8 {TOP VIEW) BLOCK DIAGRAM Vpp ->| DATA INPUT | 8 TIMES SAMPLING DIGITAL FILTER CIRCUIT OS SS 71 I I i DE-EMPHASIS DE-EMPHASIS i TIMING - FILTER FILTER GENERATOR L d M AL MUTE TEST1 INTERPOLATION FILTER/DITHER CIRCUIT INTERPOLATION FILTER/DITHER CIRCUIT =-A MODULATION SYSTEM DA CONVERTER 2-4 MODULATION SYSTEM DA CONVERTER DATA OUTPUT CIRCUIT VDA RO RO DATA OUTPUT CIRCUIT TEST2 TEST3 GNDD 2001-06-19TOSHIBA TC9237BF/BN DESCRIPTION OF PIN FUNCTIONS PIN No. |SYMBOL|1/O FUNCTION & OPERATION REMARKS 1 M/L Input data MSB First/LSB First selection pin. With a pull-up MSB First at H and LSB First at L resistor 2 MUTE | |Soft mute control pin. Mute ON at H. 3 TEST1 | | TEST pin. Normally, use at "H. 4 VDA |Analog power supply pin. 5 RO O |R channel data forward output pin. 6 RO O |R channel data reverse output pin. 7 GNDA | |Analog ground pin. 8 GNDA | |Analog ground pin. 9 Lo O |L channel data reverse output pin. 10 LO O |L channel data forward output pin. 11 VDA |Analog power supply pin. 12 TEST2 | | TEST pin. Normally, use at L. 13 | TEST3 | | |TEST pin. Normally, use at H or open. With a pull-up resistor 14 GNDD | |Digital ground pin. 15 GNDX | [Crystal oscillator ground pin. 16 xl | | Crystal oscillator connecting pin. Connecting a crystal oscillator, generates clock needed for the 17 xO O |system. (384fs) 18 Vpx |Crystal oscillator power supply pin. 19 McK O | Master clock output pin. (384fs) De-emphasis filter mode select pin. 20 EM1 l EM1 L L H H EM2 L H H L 21 | EM2 | MODE (fs selection) | 44.1kHz_ | 32kHz | 48kHz LRCK polarity switching pin. 2 RIL | R/L INPUT r LRCK 4 With a pull-up L R channel data L channel data resistor H L channel data R channel data De-emphasis filter control pin. 23 EMP | ON at H and OFF at L. A Hs Standard /double speed operation mode control pin. Standard operation at H" and double speed operation at L". 25 DATA | |Data input pin. 26 BCK | | Bit clock input pin. 27 LRCK | |LR clock input pin. 28 Vpp |Logic power supply pin. 3 2001-06-19TOSHIBA TC9237BF/BN DESCRIPTION OF BLOCK OPERATION 1. Crystal oscillation circuit and timing generator Clock required for internal operation can be generated when crystal and capacitors are connected as shown in Fig.1. Further, this converter is also operable when system clock is input from the outside through XI pin (Pin 16). However, a through consideration is required in this case because noise distortion and S/N ratio of the DA converter are largely affected by qualities of wave form such as jitter, rising and falling characteristics, etc. of system clock. \ the internal circuit a f 5 aca 7 ad YZ xX GNDX XO VDX MCK | Ot oy Xtal Te. C, =10~33pF Use a crystal with a low Cl value and quick response. Fig.1 Configuration of crystal oscillation circuit The timing generator generates clock required for the digital filter, de-emphasis filter, interpolation filter and process timing signal. 2. Data input circuit DATA and LRCK are taken in the shift register in the LSI at the rising edge of BCK. As shown in the falling timing example, it is therefore necessary to input DATA and LRCK in synchronism with the following edge of BCK. Further, because DATA has been so designed that 16bits before the change point of LRCK are made effective data, it is necessary to data when BCK is 48fs or 64fs. L-ch R-ch DATA sq 5fra}izfi2zfufiofofefz[e]s] 4] 3] 2 fsepsgis[iafi3fizfifiofofeslz7fefs]4]3 | 2 [isa Fig.2 Example of input timing chart (When R/L=M/L="H") Polarity of LRCK and input data modes are set using the R/L and M/L pin. Table.1 Channel data correspondence Table.2 Input data setting R/L INPUT : LRCK - M/LINPUT| INPUT DATA (DATA) L R channel data | L channel data L LSB data first-in H L channel data | R channel data H MSB data first-in 4 2001-06-19TOSHIBA TC9237BF/BN 3. Digital filter Foldover noise component outside the band is removed by the 8 times over-sampling FIR type digital filter. The construction and basic characteristic of the digital filter are changed by the standard and double speed operations. The contents of this change as shown below. (In the case of fs = 44.1kHz/88.2kHz (at the double speed operation).) @ Standard operation Input data 2 times over-sampling FIR type digital filter (91 taps) 4 times over-sampling FIR type digital filter (24 taps) Double speed operation Input data | 2 times over-sampling FIR type digital filter (67 taps) 2 times over-sampling FIR type digital filter (13 taps) 8 times over-sampling digital filter data 4 times over-sampling digital filter data Fig.3 Construction of digital filter Table.3 Basic characteristics of digital filter PASS-BAND TRANSIENT STOP-BAND SETTING MODE RIPPLE BANDWIDTH _ | SUPPRESSION Standard operation +0.041dB 20.0k~23.5kHz -55dB Double speed operation +0.026dB 20.0k~24.1kHz - 49dB 5 2001-06-19TOSHIBA TC9237BF/BN Frequency characteristics of the digital filter are as follows : @ Standard operation -20 -0.02 = = 2 2 w 40 a -9 2 > E ond od Qa a = -60 = -0.06 <q qt -80 - 0.08 -100 -0.10 0 20 40 80 100 120 140 160 180 0 2 4 6 8 10 12 14 16 18 20 22 FREQUENCY f (kHz) FREQUENCY #f (kHz) Double speed operation 0 -0.02 a a = z we Ww 0.04 > > E = ond onal a a = = -0.06 t <q -0.08 -100 -0.10 0 20 40 80 100 120 140 160 180 0 2 4 6 8 10 12 14 16 #18 20 22 FREQUENCY f (kHz) FREQUENCY f (kHz) Fig.4 Digital filter frequency characteristics (fs = 44.1kHz) 6 2001-06-19TOSHIBA 4. De-emphasis filter TC9237BF/BN The TC9237BF, TC9237BN has a built-in IIR type digital de-emphasis circuit and is capable of copying with 3 kinds of frequency (32kHz, 44.1kHz, 48kHz) by setting respective modes. These frequencies are set by 2 pins of EM1 and EM2 and the de-emphasis ON/OFF is switched by the EMP pin. Table.4 fs setting of de-emphasis filter EM1 L L H H EM2 L H H L Mode (fs selection) 44.1kHz 32kHz | 48kHz Digitization of the de-emphasis filter has eliminated the necessity for external parts such as resistor, capacitor, analogue switch, etc. Further, to reduce the characteristic error of the de-emphasis filter, coefficients have been adjusted. The construction and characteristics of the de-emphasis filter are shown below. Input Data [a Ga) (bp +b4Z~') (1-a4Z~") 1 1 Transfer function : H (Z)= iT 1IT2 T1 =50us, T2 = 155 Fig.5 Construction of IIR type digital De-emphasis Filter Fig.6 Filter characteristic Table.5 Typ. example of de-emphasis frequency characteristic @ Standard operation (Unit : dB) SAMPLING f =3kHz f= 10kHz MAXIMUM ERROR THEORETICAL | DESIGN THEORETICAL | DESIGN VALUE FREQUENCY fs) Value. | VALUE | ERROR | Value | value | ERROR | (assoLUTE VALUE) 44.1kHz - 2.426 - 2.453 | -0.027 - 7.601 - 7.626 | -0.025 0.04 32kHz 2.426 - 2.291 +0.135 - 7.601 - 7.456 | +0.145 0.19 A8kHz 2.426 - 2.420 | +0.006 - 7.601 -7.572 | +0.029 0.05 @ Double speed operation : (Unit : dB) SAMPLING f =3kHz f= 10kHz MAXIMUM ERROR THEORETICAL | DESIGN THEORETICAL | DESIGN VALUE FREQUENCY fs) oT VALUE. | vaLue | ERROR | Value | value | ERROR | (aBsoOLUTE VALUE) 44.1kHz 2.426 - 2.348 | +0.078 - 7.601 - 7.486 | +0.115 0.12 32kHz 2.426 -2.521 -0.095 - 7.601 - 7.641 - 0.040 0.12 48kHz - 2.426 -2.475 | -0.049 - 7.601 - 7.664 | 0.063 0.07 7 2001-06-19TOSHIBA TC9237BF/BN 5. Interpolation filter and dither circuit The interpolation filter linearly interpolates 8fs (at the double speed operation : 4fs) after the de- emphasis filter to times and over samples to 16fs (at the double speed operation : 8fs) Further, in the dither circuit, DC offset and dither have been added to data in order to prevent noise by the idling pattern peculiar to the =-4 modulation DA converter. After adding the dither, 192fs (at the double speed operation : 96fs) is over sampled in the sample hold circuit. DA conversion circuit The 2'nd order 3-A modulation DA converter for 2 channels (Simultaneous output type) has been incorporated in the TC9237BF, TC9237BN. rly 2 Q ) Output data (Bit stream 1bit DA conversion data) X (2) DATA *(+} 2'nd order =-A modulator : Y (Z)=X (Z)+(1-Z7')-2Q (2) Fig.7 Construction of 2-4 modulation DA converter It was been so designed that clock for the >-A modulator is a half of master clock (MCK : Crystal oscillation clock) and the converter operates at 192fs at the standard operation while at 96fs at the double speed operation (as a clock, the same as that at the standard operation). The noise shaping characteristic is shown below. 10dB NOISE POWER (dB) i 1 1 i L L 0 500k 1M FREQUENCY f (Hz) Fig.8 Noise shaping characteristic 8 2001-06-19TOSHIBA TC9237BF/BN 7. Data output circuit In this circuit, output data waveform is shaped and forward and reverse signals of bit stream data are output to the outside through a buffer. By differentiating these forward signal and the reverse signal in the external analogue circuit, DA conversion output of low distortion factor and high S/N ratio can be obtained. . . Inside Bit stream 1bit DA conversion data p Q ae register CK (X1/2) Analogue output Fig.8 Construction of data output circuit MAXIMUM RATINGS (Ta = 25C) CHARACTERISTIC SYMBOL RATING UNIT VDD Supply Voltage Vpx -0.3~6.0 Vv VDA Input Voltage Vin -0.3~Vpp + 0.3 Vv . a, TC9237BF 600 Power Dissipation 7C9237BN Pp 800 mw Operating Temperature Topr 35~85 C Storage Temperature Tstg -55~150 C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta = 25C, Vpp = Vpx = Vpa = 5V) DC CHARACTERISTICS TEST CHARACTERISTIC SYMBOL | CIR- TEST CONDITION MIN. TYP. MAX. UNIT CUIT Vpp 4.5 5.0 5.5 Operating Supply Voltage} Vp x |Ta= -35~85C 4.5 5.0 5.5 V VDA 45 5.0 5.5 Power Dissipation IpDb |Xl=16.9MHz 25 45 mA H" Level VIH Vpp x0.7;, Vpb Input Voltage Ta vel | wi | 0 | Wppxoa| ~ Input Current Ft evel | 10 10 A nput Current aa gy IL = - Le Pull-up Resistor RUP |TEST3, M/L, R/L pins 130 _ kQ 9 2001-06-19TOSHIBA TC9237BF/BN AC CHARACTERISTICS Standard operation (Over-sampling ratio = 192fs) TEST CHARACTERISTIC SYMBOL] CIR- TEST CONDITION MIN. TYP. MAX. | UNIT CUIT Noise Distortion THD 1 |1kHz sine wave, full-scale input -87| -78 dB S/N Ratio S/N 1 88 98; dB Dynamic Range DR 1 tkHz sine wave, 60dB input 88 95; dB conversion Cross-Talk CT 1 |1kHz sine wave, full-scale input -95| -88 dB Operating Frequency fopr 10 | 16.9344] 19.2 | MHz Input Freauenc fLR LRCK duty cycle =50% 30 44.1| 100 | kHz P quency feck | |BCK duty cycle =50% 0.96 | 1.4112] 62 | MHz Rise Time tr 3 15 Fall Time te |LRCK, BCK (10~90%) = = 15 ns Delay Time td |BCK {_ edge-LRCK, DATA 40 ns Test circuit-1 : Application circuit example-2 is used. DATA Lo APPLICATION SG BCK CIRCUIT EXAMPLE-2 20kHz IDEAL LPF DISTORTION FACTOR GAUGE MCK SG : ANRITSU MG-22A or equivalent LPF : MURATA SEISAKUSHO AFL89FB20000A2 or equivalent Distortion Factor Gauge : MEASURING ITEM | PISTORTION FACTOR GAUGE SIBASOKU 725B or equivalent FILTER SETTING A WEIGHT THD +N, CT OFF S/N, DR ON @ AC characteristic point (Input signal : LRCK, BCK, DATA) BCK Sf N | 10% | 50% rr, Y 90% 0%] | 90% 50% tg tr A weight : IEC-A or equivalent PN SOMES NSN tt DATA X X_____X X X td TN SOM LRCK ae _-_ / 10 2001-06-19TOSHIBA TC9237BF/BN APPLICATION CIRCUIT EXAMPLE-1 (+5V single power supply used) TC9236AF Single Processor for CD Player Xtal= 16.9MHz St 3 bAh, Aah a =< < < [2 a x ~~ a vw W be x= = a > oa a << uw 2 ay ran Oo ) TC9237BF, TC9237BN Ww E C ~ a 2 BK wn a > uw oO \2 IS O uw wu 2 = - oc oa a - KE Kb oO H +5V H lee |= | GND9 [7 } o <tC] Voa R | GND12 & } GNDA GND 16 }k GND13[7}g }C] GNDA > TA2009F, TA2009P I+ GND - Qoo+ o vy oO OG = ec > 2 4 > 4 R R-ch OUT L-ch OUT (Cautions) Quality of crystal oscillation waveform largely affects $/N ratio. een this is also true when system clock is input externally through the XI pin of Pind. Suppress of input signals (LRCK, BCK, DATA) as could as possible. The wiring between the TC9237BF, TC9237BN output and the analogue filter amplifier input must be made the shortest. The capacitor between Vpa and GNDA shall be connected as close to the pin as possible. 11 2001-06-19TOSHIBA TC9237BF/BN APPLICATION CIRCUIT EXAMPLE-2 (+5V two power supply used) TC9236AF Single Processor for CD Player X'tal = 16.9MHz S uw a +5v 2 t st ida CHCK Vop (>> 5656 EE & 2 F FF BB a ec m woe ww SF > z 4 a Oo ) TC9237BF, TC9237BN g pg Ss (] nda AAA Y 33k 33kQ C] ena Operational amplifier : TLO72 (Operate at +12V) 33kQ2 33kQ AAA pS al 20kQ 20kQ 20kQ |s L N oY re 4 | s+ (The same as Vcc /4 shown at the left) SZ] a 18kO, 18kO, 1 $S 3 On Kk yH or 3m 47 pF _ 33pF 33pF . + St x [+ e - I I o 33kQ 100kQ * a a 4 ~ = wDH ~ Hk 560pF 560pF R-ch OUT L-ch OUT 12 2001-06-19TOSHIBA TC9237BF/BN PACKAGE DIMENSIONS GOOOOROUGRpgoe 7 --] Jao TLL ) s2 | (ELE CTUTEToiodooes 1 4 O.995TYP 0.43+0.1 + 3+0.1 10.25 @ 1.27 le 19.0MAX \ 18.5+0.2 > Ol : x ! | Hy 3 -8 i| SF Ol al io w oy AoA a Sc | | 1.010.2 Weight : 0.8g (Typ.) 13 2001-06-19TOSHIBA TC9237BF/BN PACKAGE DIMENSIONS SDIP28-P-400-1.78 Unit : mm 28 15 Cur ra ra ea a a a a ee ea ) LICICICTUCALICICILCIOC! COCCI 1 14 o-1 5 8.810.2 10.16 26.1MAX 25.640.2 | 3.840.3 3,040.3 1.243TYP Weight : 2.2g (Typ.) 14 2001-06-19TOSHIBA TC9237BF/BN RESTRICTIONS ON PRODUCT USE 000707EBA @ TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the Handling Guide for Semiconductor Devices, or TOSHIBA Semiconductor Reliability Handbook etc.. @ The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (Unintended Usage). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer's own risk. @ The products described in this document are subject to the foreign exchange and foreign trade laws. @ The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. @ The information contained herein is subject to change without notice. 15 2001-06-19