Audio ICs Pre / power amplifier for 1.5V headphone stereos BA3632K The BA3632K is a dual-channel pre / power system IC designed far 1.5V headphone stereos. There is no need for BC/DC conversion, and the system can operate off a single battery. The IC draws low current (Icc = 2.6mA) to allow long set life. @Applications 1.5V headphone stereos. @Features 1) Dual pre-amplifiers with auto reverse compatibility. 2) Dual power amplifiers. 3) Bass boost circuit (variable bass boost). 4) AMS circuit (on chip comparator). 5) Ripple filter. 6) Low power consumption (Icc = 6.8mMA, O.5W x 2ch, Ri = 32Q)}. @Absolute maximum ratings (Ta = 25C) Parameter Symbol Limits Unit Power supply voltage Vec 3.0 Vv Power dissipation Pd 400*! mW Operating temperature Topr 10~+60 c Storage temperature Tstg 55~+125 Cc 41 Reduced by 4,0mW for each increase in Ta of 1C over 25C, @Recommended operating conditions (Ta = 25C) Parameter Symbol Limits Unit Power supply voltage Veco 0.95 (0.98) ~2.2% Vv * The range Voc=0.95V to 0.98V is the operating range for which ascillatian will not occur. The ripple rejection for the ripple filter is stipulated for Voc =1.1. ROAM B49Audio ICs BA3632K @Block diagram BIAS_IN FWD_IN+ REV_IN2 PRE_NF2 AMS_OUT BIAS_QUT FWD_IN? REV_IN [2s] [23] [ 22] fer] [20] [i] [ie] [a7] _ oe] Veo . PRE_MUTE [zs : i f ve] PRE_OUT2 d ! 25k y S 28k FWD / REV [2 4 3 18 AMS_DET 3 im _ ray E s oO FA 200k 2 200k c, LOW_BST [2 = = 13] PRE_OUTI z| |g b a PWR_MUTE [z 18 PRE_NF1 STBY [2 12] PWR_INA ak = 90k | RF_IN E 4 iW | LPF1 iV Wy [ 4 210k 3k 90k oi ) a RF_OUT | 31 iu WV + 10 | PWRLIN2 - l 7 ver 2 =30k a= T RE_BASE E | | = 9 | BST_NF | 8 L__ Ly} E] Ee I eI te Ee el Voc PWR_NF GND AGC_TAU PWA_OUT1 BST_OUT PWR_OUT2 LPF2 850 ROAMAudio ICs BA3632K @Pin descriptions Pin No. Pin name 1/O | Pin voltage Internal equivalent circuit Function +B Power supply 1 Voc I 1.2V Power amplifier output pin 1 Voc 2 PWR OUT Oo 0.76V Voo Power amplifier output pin 2 50k 6 PWR_OUT2 0.76V ) 2 3 PWR_NEF l 0.76 Vor Power amplifier NF Power amplifier input pin 2 10 PWR_IN2 I O.76V Power amplifier input pin 1 12 PWR_IN1 I 0.76 Boost amplifier output RF GUT Veo 4 BST_OUT Oo 0.76 Ground 5 GND I GND 851Audio ICs BA3632K Pin No. Pin name 1/O | Pin voltage Internal equivalent circuit Function ASC time constant setting pin for boost Voc 7 AGC_TAU 0 - an x Low-pass filter pin 2 RAF OUT Veo (8) 45k B LPF2 Oo 0.76V et Boost amplifier NF FF OUT 9 BST_NF I 0.76V Low pass filter pin 1 PWR IN1 11 LPF1 oO 0.76V PWR IN2 852 ROAMAudio ICs BA3632K Pin Ne. Pin name lf |Pin voltage Internal equivalent circuit Function 13 PRE_NF1 l 0.744 Pre-amplifier NF pin 1 17 PRE_NF2 I 0.74V Pre-amplifier NF pin 2 18 REV_IN1 I 0.76V Pre-amplifier REV input pin 1 19 REV_IN2 I 0.7BV Pre-amplifier REV input pin 2 21 FWD_IN1 I 0.76V Pre-armplifier FWD input pin 1 20 FWD_IN2 I 0.76V Pre-amplifier FWD input pin 2 Pre-amplifier output pin 1 RF OUT 14 PRE OUT1 Oo 0.5V Pre-amplifier output pin 2 16 PRE_OUT2 0 0.5V AMS comparator input Vos 15 AMS_DET I 0.76V i" Bias output Veo Veo 22 BIAS_OUT Oo 0.76V 853Audio ICs BA3632K Pin No. Pin name 1/0 | Pin voltage Internal equivalent circuit Function Bias reference output Voc: Voc 10k iv 23 BIAS_IN o 0.76V 6.2k Ly AMS detector output 24 AMS_OUT o _ Pre-mute control Veo Veo 25 PRE_MUTE - 3 *e ah Pre-amplifier input switch Veo Voc 26 FWD / REV l _- aa 854 ROAAudio ICs BA3632K Pin No. Pin name 1/@ | Pin voltage Internal equivalent circuit Function Boost ON / OFF control 27 LOW_BST I - Power mute control 28 PWR_MUTE I - Standby control Veo Vee Vec aa 2 STBY | | When open 2 30k Ripple filter reference output Veo Veo 24k 60) 45k 30 RF_IN oO 1.13V 40k wD 855Audio ICs BA3632K Pin No. Pin name 1/0 |Pin voltage Internal equivalent circuit Function Ripple filter output 31 RF_CUT o 1.18 We 100k Voc aM Ripple filter external transistor base 32 RF_BASE oO 0.65V 856 ROMAudio ICs BA3632K @Electrical characteristics (unless otherwise noted, Ta = 25C, Vcc = 1.2V, f= 1kKHz, Ri = 10kQ (pre-amplifier), RL = 32Q (power amplifier), L BOOST OFF, 0dBm = 0.775Vrms) Parameter | Symbol | Min. | Typ. | Max. | Unit | Coniditions Pre--power amplifier? Voltage gain GVTTL 54 57 60 dB | Vo=20cdBm Circuit current 1 Icc1 _ 2.6 4.2 mA |Vin=0, Rg=2.2k0 Circuit currant 2 loc? _ 2.6 44 mA |LBOOSTON, Vin=0, Ag=2.2kQ Circuit current 3 Icc3 _ 6.8 10.3 mA | Pour=0.5mWx2ch, Ag=320 Circuit current 4 Ico4 _ 5 20 HA | STBY OFF (Pre-amplifier) Open-circuit voltage gain Gva 61 73 _ dB | Vo=20cBm Glesed-circuit voltage gain Gvc 33.5 35 36.5 dB | Vo=20dBm Maximum output voltage Vom 120 210 _ mY | THD=1%, DIN AUDIO Total harmonic distortion THD _ 0.2 0.6 % | Vo=20dBm, Gve=35dB (NAB), DIN AUDIO Input conversion noise voltage Vian _ 1.5 3 wv | Rg=2.2k0, Gve=35dB (NAB), DIN AUDIO Channel separation cs 37 46 - dB Single-channel input, Rg=2.2k0 ingle-ch | input, Rg=2.2kQ FWD / REV REV crosstalk CTr-r 51 59 dB | Angle frame! input, Rg Rg=2.2kQ, Var=30dBm, far=100Hz Ripple rejection RA 43 53 dB | irro=25mA, BPF 2 100H2 1/4 OCT Mute output valtage VMLUTE - 110 90 dBm | Vin=40dBm, PRE MUTE ON <Bass-Lpower amplifier? Voltage gain 1 Gv1 21.5 23.5 25.5 dB | Vo=20cBm Voltage gain 2 Gv2 21.7 23.7 25.7 dB LBOOST ON, Vo=20dBm Voltage gain 3 Qv3 31 35 39 dB LBCGOST ON, f=100Hz, Vo=20dBm Rated output power Pout 5 9 - mW |THD=10%, DIN AUDIO, RL=162 Total harmonic distortion THD 0.35 1.3 % Pour=imW, DIN AUDIO Channel separation 1 csi 33 40 _ dB ye eae input, Fg=0 Channel separation 2 cse 35 45 dB cary vt meal ON, Output noise voltage 1 Vnot _ 24 40 eV | Rg=0 Output noise voltage 2 Vino? - 48 80 uV |LBOOST ON, Rg=0 Ripple rejection 1 ARI 64 | 74 CBee ope snooeia ocr L.BOOST ON Ripple rejection 2 RR2 42 51 _ dB Rg=0, Var=30dBm, frr=100Hz Ipro=25mA, BPF : 100Hz 1/4 OCT Input resistance Rin 75 10 13 kQ - Channel balance CB 1.5 0 1.5 dB Vo=20dBm Mute output voltage VMuTe |-110 90 dBm | Vin=30dBm Vin=43dBm, f]=100Hz, RL=160 AGC level Vace = (14.1 |-12.6 |10.9 dBm |AGC level measured at the end of the 16 Q resistor ROAM 857Audio ICs BA3632K Parameter | Symbol | Min. | Typ. | Max. | Unit | Coniditions (Ripple filter block) - rp econ nn | a3 | co | | os (YSaIY, Vane Soci, tm soor BC output voltage Ver 0.89 0.94 _ Vv Veo=1.0V, Inro=25mA (Bias block) DC output voltage vers | 068 | 076 | 083 | Vv |Voo=1.0V (AMS block} Song detectlevel 1 ves |2a6 |22 204 | apy /,OWEFIMUTE ON | Song detect level 2 VMS |396 |38 |364 | dBV Pc MUTE Niro {AMS5-Ta characteristics) Ambient temperature Ta 10 +25 +50 C _ Song detect level 3 AVBS) | -1.1 o | +06 dB When vrnw0.6Vr0 Song detect level 4 AVus | 1.1 o (+06 | ap |ROWERMUTE Orr Control block) Standby on voltage Vston _ - 0.4 Vv LY > POWER ON Standby off voltage VstorF 0.9 - - Vv H {OPEN : POWER OFF Standby pin current IstBy - 23 45 KA | Veapin=OV Power mute on threshold Vurton _ _ 0.05 Vv L > POWER MUTE ON Power mute off threshold Vivrorr 03 _- _ Vv H {/GPEN : POWER MUTE OFF Power mute pin current Iswes _- 0.3 0.3 HA | Mespin=0.1 FWD/REYV low threshold ViH26 - - 0.4 Vv L > REV FWD/REY pin current Iswee - 3 6 HA | Veerin=O0.2V Low boost off threshold VLiBorr - - 0.1 V L | LBOOST OFF Low boost on threshold Vipom 0.4 - - V H / OPEN : L.BOOST ON Low boost pin current lswe7 - 0.3 0.9 BA | Veven=0.1V Pre-mute low threshold Vines - - 0.4 Vv L > PRE MUTE OFF Pre-mute pin current Iswas - 3 6 BA | Vospn=0.2V Not designed for radiation resistance. 858 ROAMAudio ICs BA3632K @Measurement circuit QO AMS OUT Hk "Go 2ST BAS i 1 PRE iewee 22 SWI8 MUTE ea 3 THES, = Pwo 10 2h S018 REV Be pao LOW + vis , ska ey a sw7 pst a ee ay FE FWA 1aWyES, e+ SW16 MUTE, FD} SYSTEM COHTROL war tan oO PRE CAITI 29 RE a a OUT Ww 5 z wy 4 a a oc 2SB-295-L16 ve O-J Veo ere a HF CAT PRE MUTE GND OPEN MUTE OFF MUTE ON AMS ON AMS OFF 19 HP CUTT FWO / REV TH3 GND [OPEN ALS. REV FWD a2 LOW BOOST GND OPEN OFF ON PWR MUTE GND OPEN MUTE ON MUTE OFF AMS BS RMS MS STBY GND [OPEN POWER ON [POWER OFF Fig.1 ROAM 859Audio ICs BA3632K @Measurement circuit switching table SW No. Parameter Symbol 1/2/3]4[5]6]7/| 8/9 | 10]11| 12/13/14] 15] 16] 17] 18/19 {Pre-+power amplifier) Voltage gain GVTTLI2/ 12/1/1/2)1/2) 1 1 1 1 3973/1 1 1 1 2/12 |1/2| 2 Circuit current 1 ot | 1 fata fPay se) ep ep de papaye ty db peqgey eye yp eyed Circuit current 2 c2 Jel ete Pepe etsy ep dep epee sy dep eee ye fad ada Circuit current 3 oS fasdafiivai/2ad) yd) bt) ayayt yey cy ey by d | a2 pratt Circuit current 4 lof 1) if} a;apd i ey dy bpadayde yey dy be ypagyid sd jays {Pre--amplifier} Open-circuit voltage gain Go [2/fefiaii2/q2)2)/2)2)1)471)474)1)2)4) 2 n/2) 2 Closed-circult voltage gain Ge |e) ee dp ep apap apap) yp ey ey dey ep er ep bp a by Maximum output voltage Vom fd et ep ep ep ep ge sty eT bpd yb pay ep aed gy ed ey Total harmonic distortion | OO ee OO Input conversion noise voltage | Van | 1] 4]/4a)/ 7} se) bps per ep ep ey ey ey sl epey sy dye Channel separation cs 2iiif2;i;a} ei} eps i eee iP bi dpe pd ep eyed tad 1/1 jafqivet ted i ep ep bp te tee ee pT eT dT tt 2d FWD / REV REV crosstalk CTra Pfiefiiseiye) td | bpd] eee te ep ep tp be et | dt leva] Ripple rejection RR {t/a ft apse ]_ sp dy eT dys] te yT hy sey ats yd fd jive d Mute output voltage Veure (2/1efqi/senvey; d ] bpd pep dp bp ey bp aya | Lydy ey ey {Bass+power amplifier) Valtage gain 1 Gvi 1) qa} ay ryt) typ ap ape yp]a]y day ty ay ay ay dy} ay} 2] 2 Voltage gain 2 G2; bP ep ep dey dp ey dp ep bpd pep aye yey dyads ya Voltage gain 3 QS fp ep ep eye dy dyp bey ep eypeTey ey eps yey dey era Rated output power Pour | $f} ey ey ey dp dp dy ep ep ep aqpayey ey eye paraded Total harmonic distortion se a a a Channel separation 1 cst} uy) ey ey by df} id dy b avapva) ep ep bp bp bp ep eb Channel separation 2 cos2z } i} dy ep bp ep bp ey bp ay ep by ep ep ep bcp ad pay by Output noise voltage 1 Veo | dp ep dy ep ep ey ep ep adap ep ep ap bP ae bcp aby Output noise voltage 2 Vno2@ ft} df ey eps pT ep eT eT eT bye yT eye ey ey dy aged Ripple rejection 1 RAI} LP sy ep ep ep ep ee ep ep bp bcp be papaya se paddy Ripple rejection 2 RRe | df} dep d psp ey bt dy ep dy ey dd ep dp ee bcp dp ay bd Input resistance Tn ee eS Channel balance CB yd] ys fey eye eye ep eyed ee] bp bec ep ep by Mute output voltage Vuue } $e Pe Ped ed bp bed ep ep ep ep ep bp bp be pad bp bd AGC level Vasc |b FL Pet ete ye pdb baby ee pc eapeat dye ep aya by Ripple filter block} Ripple rejection RA 17,774) 472) 779) 1} 47,4) t)1} 3s) 2)2 2 2 DC output voltage Vee Tk) dep dbp dp ep ep ee eT EP EP EP EP ap ap ep ere ep ed (Bias block) DC output voltage [vers [1 iifafifalifalifafr1fafrfifalefsalele]e {AMS block? Song detect level 41 Ves 2r1/i]7 1) 1} a;r yaya yr yr yay r>r yaya; a2]; 2a)]e2 Song detect level 2 Vas |b fete eye Pepe _ dye pT sey eT ey gp bp ey dyed dd 860Audio ICs BA3632K SW No. Parameter Symbol 1/2/3]4[5]6]7/ 8/9 | 10]11| 12/13/14] 15] 16] 17] 18/19 <Control block} Standby on/off voltage Ver 1)1/}/4)/ 47771) 9) 4) 77 pr yrye2 1);2/)2)2 Standby pin current Ismay | S$] Pp dy ep ey ey ey dey ep ep ec cb | eda s/h] fe Power mute on/offthrashold) Ver | ] 4] $f) eb) e) bye) bpea;ar dy by dye) te pay eyed Power mute pin current Iswee | $F] bP bP dP ep ey by ey ep ec ep eT a ap gpa eed FWD/REY low threshold vrs f2fieiivaif2) d) eb] bp dp apap bp bp dd dp bp ep add FWD/REY pin current Ibwe |) df) bp dep dy ep dey dp dy ep ep ep dy dp ey dy ey eaqa Lowbooston/offthreshold | Visa |} 1/17/1/)/a]) 6) 4) } 2727 et] eee) bye layed Low boost pin current Iswer | $f) de] by ep ee ee ep EP EP bP ep ep bp bp ee Pre-mute low threshold Wows [2/1 O/dds 2a) db) dy by] dp tap be bP dp db bp bb eas Pre-mute pin current Iswes | L | Lp dp ep dP Pe EP ep ep ee dy ed dy bp de 861Audio | Cs BA3632K @Application example REW-F FWO-A AMS OUT FWD-L G26 C25 1000p = 1000p REV-L R20 = 100% C20 Wea 25F1S7EAS so Ris 220k PRE MUTE TS5| Kr yl * =wo aMe PA 25c40a185 [25040815 TREY a Ler | oie Big ek O.1 me es 8 he}= 1 2710 5 Ee Ot Oye 680 ow z PRE | 7 on ___>_+_ PRE ourz 2k BST 3 14 ET ps ia . t PAE OUTI PWR 5 aay ce vel |. ; . > = Oe CF" um 5 FE 018 j = 2 NAL Pl 45 i. = fap" cad YS Fa q+ F Pw Lo. eray _ Heb C8 cra 0k A 50K: A Se [ey aH ei 48k Ve AF 8k LFF sta IF ia RF 210k TT E50k Oe RF OUT RIPPLE PILTCR | L. an A Tae 6830p WDET = BS 2h 2k i oe 7 ra} ANF oe Loy FT 26B1265-UL6 \B/ San V2 O+ | a 4 5 3 F a PWR est of ante so] LEF2 _NF OUT Guz) TAY cB = cr | +". G4 5 a? O10 23 ote D.847 je O18 % Ai = Ae ee] eed 28 " 100 gz PRE MUTE =) GND OPEN y, HP. MUTE OFF | MUTE ON (920) AMS ON AMS OFF FWD / REV Be ah I. * +N 100 ps LOW BOOST GND ON PWA MUTE GND OPEN MUTE ON MUTE OFF RMS BS RMS MS STBY GND OPEN POWER ON | POWER OFF Fig.2 862Audio ICs BA3632K @Electrical characteristics curves PRE +POW Ta=25C 5 VYin=OVims PRE Ta=25C Veo=1.2V (dB) V Tastac Ver=1.2V Rg=2.2k0 Ria10ka AL: Q Dice ima) NAB MUTE;OFF Lae Fr QUIESCENT CURRENT th rh TOTAL HARMONIC DISTORTION : THD(%) OPEN LOOP VOLTAGE GAIN : Gvo dB) CLOSED LOOP VOLTAGE GAIN : Gc 0 1 2 3 10 100 ik 10k 100k 100 200 300 400 POWEH SUPPLY VOLTAGE : Vco V3 FREQUENCY : f (Hz) QUTPUT VOLTAGE : Vo (Vrms? Fig.3 Quiescent current vs. Fig.4 Voltage gain vs. frequency Fig.5 Total harmonic distortion vs. power supply veltage output voltage Ta=25'C Rga2.2k0) RL=10kQ Gv=36dB (NAB) DIN Ta=25C Ag=2.2k0 AL=18k a Varn=-30dBm fAR=' OUTPUT NOISE VOLTAGE : Vic (mrms) CHANNEL SEPARATION : Cs (dB) RIPPLE REJECTION : RA(dB) a 1 2 3 10 100 ik 10k 100k a 1 2 3 POWER SUPPLY VOLTAGE : Vec () FREQUENCY : f (Hz} POWER SLIPPLY VOLTAGE : Vcc (V) Fig.6 Output noise voltage gain vs. Fig.7 Channel separation vs. frequency Fig.8 Ripple rejection vs. power supply voltage power supply voltage s : Ta=26C Voo=1.2 Va=- R.=320 G=100 uF OUTPUT VOLTAGE GAIN : Gv (eB) CHANNEL SEPARATION : Cs (dB) TOTAL HARMONIG DISTORTION : THD( 34 10 100 1k 10k 100k 50 100 300 500 1000 19 100 1k 19k 100k FREQUENCY : {Hz) QUTPUT VOLTAGE : Vo (mvims? FREQUENCY : f (Hz! Fig.9 Voltage gain vs. frequency Fig.10 Total harmonic distortion vs. Fig.11 Channel separation vs. frequency output voltage ROAM 863Audio ICs RIPPLE REJECTION ! RR(dB) 14 100 ik 10k FREQUENCY : f {Hz} 100k Fig.12 Ripple rejection vs. frequency @External dimensions (Unit:s mm) MUSIC DETECTOR LEVEL : Vas (d8V)} b2 Vec=1.2V Vedan=0.6V PREOUT level POWER MUTE OFF B64 | ent] Lene) Lene 665] 8 20-10 0 10 28 30 409 50 60 AMBIENT TEMPERATUAE : Ta (C; Fig.13 Seng detect 3 vs. temperature QFP32 MUSIC DETECTOR LEVEL : Vas(dBV) BA3632K 46 Vec=1.2V Vedoin=0.6V PREOUT level POWER MUTE CK 48 [ean Ln ner Lae] 50 52 20-10 0 10 20 30 40 50 & AMBIENT TEMPERATURE : Ta!'C) Fig.14 Song detect level vs. temperature 864