TCA750

TCA750 ETC1 | Alldatasheet

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| TCA750 MULTI-STABILIZER FOR ELECTRONIC TUNING The TCA750 is basically a stabilizer for use in electronic tuning systems. The circuit is combined with an external reference diode which entirely determines the thermal stability of the system and can be adapted to the stability requirements of AM, FM or TV receivers. The reference diode BZV38 used in conjunction with the TCA750 form an ideal pair for FM tuners in radio or TV receivers. Additional to a stabilized voltage (Vg1) for the electronic tuning system, the TCA750 incorporates two other output voltages (V92 and Vg3) for stabilized supply of the entire receiver combination as well as the following attractive features: © The output current of any of the three stabilizers can be increased by a discrete power transistor without affecting circuit stability. © For mute control at switching on, V2 can be delayed by external components. on Vol. @ Adjustable a.f.c. amplification factor (<5). © Pulse or touch contact operation switches off the a.f.c. whilst changing stations. © Delayed switching on of the a.f.c., externally adjustable (tg <2 s). @ Search tuning becomes very simple when using the a.f.c. current source (pin 10). © All three stabilized outputs are protected against short-circuit and are individualiy adjustable. QUICK REFERENCE DATA see page 2 PACKAGE OUTLINE 16-lead DIL; plastic (SOT-38). I roam

Input voltage range V13-16 26,5 to54 V a Ambient temperature Tamb typ. 25 °C Input voltage V13-16 typ. 45 V —» Tuning voltage (V1) * V12-16 21 to 34 V Output current (11) * hia < 14,5 mA Stabilizing time tstab typ. 08s Temperature coefficient (V1) TCA750 typ. 1 ppm/°C BZV38 AVoW/AT typ. 30 ppm/°C Line regulation AVo1/AVin typ. 10 ppm/V —» Output voltage (Vo2) * V14-16 8to21 V Output current (12) * 14 < 6 mA —* Output voltage (Vo3) * V2.16 8 to 29 V Output current (13) * lo < 6 mA a * Symbols used in test circuit Fig. 3. r ern oO

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TCA750 | | RATINGS Limiting values in accordance with the Absolute Maximum System (HEC 134) Input voitage (supply) V13-16 max. 54 Vv A.F.C. input voltages (pins 8 and 9) Vg-16, V9-16 max. 7 Vv +Vg9 max. 6V Output current pin 12 2 max. 55 mA pin 14 144 max. 20 mA pin2 '2 max. 25 mA Input current (pin 11) £144 max. 6 mA Storage temperature Tstg —55 to + 150 °C Operating ambient temperature Tamb —25 to + 150 °C * Total power dissipation see derating curve Fig. 2

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[TTT TTT TT TTT tty Sagseeueeeuen HEHE EH See aeee HAH Prot Perry rr yyy ter otf it | (mw) CET eee PrP Pryy yr ry re tft CPT Tyre DPN TT eee Pa AN sooo SNe COPPA CPPPT rrr rrr N Prey ry PO NH LEA Fy ate ff | Seen PEP T Nr CEN PPT Try rrr ss +++ TTT P+ | He ~H LS =F -H- LTT Tt TTTTT Nd anes pC LOOT Tr Ne -50 ie} 50 100 150 — Tampl(°C) Fig. 2 Power derating curve. * See derating curve Fig. 2. a May 1979 | (4d ora —_

Multi-stabilizer for electronic tuning TCA750 Teor in from Vt | Vere in | —— [er ( RB2 12k all Fen toRT 7, v2 8 8 9 ” 1 14 n re stab. 4) coupling switch circuit L well BEET TT [Lo po SSS io wes @) [res = | Trot Tote [| * Vafcin is superimposed on a common-mode voltage (Vegm) of 5 V to 17 V. Fig. 3 Test circuit and multi-stabilizer peripheral components. Note to power reduction resistor RD For worst case conditions (maximum output currents of the three stabitizers and a high supply voltage Vin) the power dissipation (Pto¢) must be reduced by the use of the external resistor RD. | (Vin — Vol)? RD The minimum permissible value of RD is derived by the formula _ Vinmax — Vol ~ Vafcout RDmin = Than 12 — !13 min where, 113 min = 4.5 mA (stand-by current I.) = Wy 5 | May 1979 * | room —

TCA750 | CHARACTERISTICS and APPLICATION INFORMATION Tamb = 25 °C; see test circuit Fig. 3. Supplies note min. typ. max. Input voltage Vin 1 26,5 - 54 Vv Input current Not 2 - - 31 mA Output characteristics D.C. output resistance (all stabilizers) Rout - - 1 - 2 Permissible output short-circuit duration stabilizer 1 t - continuous stabilizers 2 or 3 short - _ - 10 = s Stabilizer 1 —+* Output voltage range (adjustable) Vol 3 21 - 34 Vv Output current 1 45 0 - 5 mA Stabilizing time tstab 6 - - 1 s Output voltage temp. coefficient AVo1/AT 7,8 - 40 - ppm/°C Line regulation AVo/AVin 8 - 10 - ppm/V A.F.C. coupling circuit A.F.C. input voltage (% Vafe swing) Vafe in - - - 5 Vv A.F.C. output voltage (% Vafelim swing) Vafe lim 15,16 — - 09 Vv A.F.C. output current threshold l1o 15,16 — - 1,5 mA A.F.C. output current swing lafe lim 15,16 — - 3,0 mA A.F.C. off delay td = - 2 - s Amplification factor BL - - - 5 A.F.C. slope (Alafe/AVafe in) Ss 14 - 25 - mA/V Common-mode voltage Vecom 9 5 - 17 Vv Vo1 change due to a.f.c. switching AVo1/afc - - - 25 mV A.F.C. switch operated by manual switch Input voltage (a.f.c. on) Vsw - -0,5 - +05 V Positive input voltage (a.f.c. off) + Vow - 0,8 - 6 Vv Negative input voltage (a.f.c. off} —Vsw - 08 - - Vv Positive input current (a.f.c. off) +l - 0,004 = 3 mA — Negative input current (a.f.c. off) —t14 - 08 - 2 mA — A.F.C. switch operated by pulse Positive trigger pulse peak current +144 pulse 13 pulse width = 10 us = 800 - 3000 ywA 100 ys - 80 - 3000 yA 1ms - 8 - 3000 yA 10 ms - 4 - 3000 yA Negative trigger pulse peak current —111 pulse - 08 - 2 mA Negative trigger pulse width - 10 - - my -" May 1979 | (46 ' —orouW _— ~

Multi-stabilizer for electronic tuning | TCA750 Stabilizer 2 note min. typ. max. Output voltage range (adjustable) Vo2 10 8 - 21 Vv -_ Output current 12 5 ie) - 5,5 mA Output voltage temp. coefficient AVo2/AT 7,8 — 45 - ppm/°Cc Switch-on delay time tdon 11 ie} - 6 s Switching voltage V1-16 - 08 - 1 Vv Stabilizer 3 Output voltage range (adjustable) Vo3 12 8 - 29 Vv -_ Output current 13 5 0 = 5,5 mA Output voltage temp. coefficient AVo3/AT 7,8 — 45 - ppm/°C Notes 1. The Vin range depends on the value of Vo1 (see Fig. 4). 2. Ati1=5mA, 12 = 13=5,5 mA, 14g =0. 3. Adjustable by means of RA1, RB1 and RP. 4. \\f a higher level is required from the output of stabilizer 1, the reference diode supply may be obtained from the emitter of a power transistor connected to the output from stabilizer 3 (see Fig. 8). In this case, the current available from stabilizer 1 is increased to 12,5 mA (bleeder current IRA1 = 2 mA). 5. At Tamb = 60 °C maximum with all stabilizers at rated currents. 6. With Vo1 within 0,05% of its steady value. 7. Temperature coefficient at Tamb from 10 °C to 60 °C with Vj, constant, and using metal film bleed resistors having a temperature coefficient of < 50 ppm/°C. 8. With all stabilizer output currents constant and within the specified limits. 9. Common-mode voltage = voltage between pins 8 and 16, and 9 and 16 of the I.C. 10. Vo2 depends on the value of Vol (see Fig. 6); adjustable with RA2. 11. Adjustable by means of RT and C71. The delay time is limited by the leakage current of C71. 12. V3 depends on the value of Vo1 (see Fig. 7); adjustable with RA3. 13. The delay time after triggering depends on the value of C72. 14. With RE = 10 kQ and Tampb = 25 OC. 15. Vafc out at Vag in after limiting. 16. With RE = 10kQ; RA1 = 12 kQ. May 1979 * / a 5)

TCA750 | 7Z264572.3 3 7264580.4 25 a a Oe Co ?: PPP Pree EOC fT EETPE eer rr PPP s 60 leonst OCCT BERR f tye.) PEE / late va see Eee) (ae, in ima) ECCT eee] Marcin, SERRE Met Sw DPILILT COE Senge 2nnnneee REE EH 504 we 2 HCC 2 22> ase HACE | 4 COCOSSCECP Eee LRT TTT Trt ty et ty EEEEEPBS Es Ser ri tre rrreee | LTP TSN PPT co COOCC CSS PEP TT yy COA se 40 ei ae See P| COON Ps rTTyTTfry <2nn Po EEE oo 1ECEERC Ee, COC ser HEE NEE sof FEL ESE EE EEG leone 4-7 - S PP pert te CEC CCCCr PSS] Ler Terre EOE se Celene tn COCO COCO CEE eee SERRE SSeS Seeseeee ee goALLITTIT TTT ttt ttt | 9 COSC er , 20 25 30 Vol (V) 35 o 25° RE (kM) 50 Fig. 4 Range of values for Vo1. Fig. 5 Determination of 149 and S-factor ee ee | a | Pett ett EEC EEE V2 EEE Eee eH Vo3 EERE EEE EH

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A eee & Zenne Seen a Lat - be fae SS 4 — > Ths S ste see Ee = COCerRYA Peet LT PTT ATP Pip Pt tt ty py aA EE PPP err 10 i Aen 10 Ht 03 tower limit oT FIA N92 omer it +4 Poor PEECEEEEEEEEE] FREER sLLit lity ri rrr 0 EERE EHH] 20 25 30 Vol (V) 35 20 25 30 V1 (V) 35 Fig. 6 Range of values for Vo2. Fig. 7 Range of values for Vj3. i% May 1979 . id 1 oom ~~

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