DBL1035

DBL1035 DAEWOO | Alldatasheet

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PLL FM STEREO MULTIPLEX 1621P Unit: mm DBL 1035 contains 2 functions of skip noise control and pilot cancel. ~ se I ps Ss . wi (J FUNCTIONS me Fs . i i \\ oa © Pilot canceler. co SAUUIUEDSN opr High-cut controller(HCC) [ ce 4 300 © Stereo noise controlier(SNC) Tastee estates © VCO oscillation stop 20h O Automatic selection between stereo and mono ( FEATURES © Low distortion © Good ripple rejection of power supply © Wide supply voltage range : Vcc =6.5V~14V © Input signal voltage : Vin =200mV~300mV

APPLICATIONS

(1 MAXIMUM RATINGS (Ta=25°C) Characteristic Symbol Rating | Unit —*s: | Supply Volage =SS*~*S«w 16 i Vv | | Lamp Driving Current ~ Taw 30 1~ ma —'| i Power Dissipation Po 520 mw | Operating Temperature Topr —20~+70 | °C Storage Temperature _ | Tsg 40-4125 | co ne

(BLOCK DIAGRAM AND APPLICATION CIRCUIT a fs wernien sare ia Gf) ne a ton? —j ISLS pdis¢ fret f=] | Lae | Pee veo fecal [sain] =) L ote I [I aa oe tl Leno Onenon hom on —T soe t™ r COTEST CIRCUIT DWC Ao Oe a ee veeo Mt oT | @ wm | Te “1 i g= | \\ ; : onl de we 2} 3 Vee ae = Thike TT ae oo, ‘SWI : Place in the A " dae LTT meee for other than separation for other than HCC, SNC Bandwidth 100KHz, THD=0.01% or less SW3 : Forced mono switch Input impedance 330K.2 or more

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(ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25°C, Voc = 10V, Vin =300mV, f= 1KHz, L+R=90%, Pilot = 10%) | Characteristic Symbol | Test Condition Min. | Typ. Max. | Unit | Quiescent Current Teco | - | — | 22] 28) ma | Channel Separation | CHsep H - 45 50; — | GB | Monaural THD THD yo | Viyy =300mV(mono) } 007 | 02 | % en nine a | Stereo THD | THD gr - — | 007) 02 | % | Lamp Turn-on Level Vuame | L+R=90%, Pilot = 10% | 80} 85) 120) my H | Capture Range CR - f= | 43) - | %) | Output voltage | Vour | - 150 | 215; 300) mv | \\ | | Rg =20K 2 6a! 74) — . aB | ig? - | ; oB | Signal to Noise Ratio | S/N a —+— Toput Resistance Rn - -— | 20) - j Ko | i a ee a SCA Rejection Ratio | SCAr6j - C= 80| — oB | | THD =1%, Rg =20K 0 700 | 900) — | mv | THD = 1%, Rg = 10K. {oo 450 7 | mv [SNC Output Attenuation | ATT(SNC) | Ve=06V, L-R=90% Pilot=10%) -85 | -3 | -03 oB [SNC Oulpul Vonage _ =01V.LR=90% Pilot=10%) — | =| stm SNC Output Voltage | Vour (gnc) | Ve=0-1V. L-R=90%, Pilot= 10%) — | — 5 mv ‘HCC Output TATT(HCCI) | Vr =06V,L+R=10%, Pilot =10% -15 | -9| -05 GB ee ee | Attenuation | ATT(HCC2) 1 V,;=1V, L+R=10%. Pilot=10% -2 | TP 0 4B |: Se GEESE Gemeee ee ee aa Ripple Rejection | i | | | i —— Se oe GE aera | VCO Stop Voltage | VCO stop | - | - 7.3 -iv ! Channel Balance CHeat | = | — | 05) 15 By | Pilot Cancellation | Poan - | 20) 27) — | b | | | J Stereo Lamp Current I Lawp | Min. stereo operating current | 05 | — | — | mA ee fp | saturation | | | ' | Vat Tuam =10mA -) thsi ve | Voltage(Pin 10) | L |

(J INFORMATION IN USING IC 1. Pilot cancelling circuit A level-following type has been used. Once set, it can easily accomodate varying pilot modulation depths among stations. Cancelling signal is a sawtooth wave obtained by integrating R and C with a square wave that is proportionate in amplitude to pilot level AD “ Pot sian Sawnooth wave it VJ V/ tonne y NW ith savers weve pep _ to ene a? rT H Hi Cancelling signal: i 1A sawraoen nee simulated by iterating crevit 2. Separation adjustment DBL1035 has separation only in a 25 to 30dB by itselt. if a phase correction circuit is provided as shown below, it can have intrinsic separation charateristics, typically 500B. poo , 1 aK | 0x Soars i t 2| — carroas inet H H | H 1 sso00r J | ' ' ! H Pra correction cecuit 3, Adjusting the free running frequency When connecting a frequency counter, use a timing set resistor and a semiset resister. Connect the counter with a high impedance input to the connection between these resistors with a 100K 2 DaLioas [15] Yee 12K O.1HF 1000p F 1uF s I Tox of Tesueney 2M 318K Adjust within 76.00 kHz +50 Hz —— eeSeSeSeSSeSeSSSsSSSsSSSSSSSSSSsesSese

(INFORMATION IN USING IC (continued) 4. Stereo noise control and High cut control The DBL 1035 has SNC and HCC terminals for improved S/N ratios when operating in weak radio fields. Noise unique to stereo FM in weak fields can be reduced by adjusting the SNC terminal. The HCC terminals permits further improvement of effective S/N ratios by lowering treble levels of FM noises in weak fields. (See Graph 2). Stereo deteriorates approximately 21.7dB(compared to Mono) in weak radio fields(See Graph 2). Generally, when S/N ratios deteriorate below 30 to 40dB, noises become quite noticeable. 1) Stereo noise contro! Stereo S/N ratios deteriorate 21.7dB in weak radio fields but it can improved by varying stereo se- paration. The relation between separation and S/N improvement is shown in graph 5. SNC improves S/N ratios in weak radio fields by varying separation. It varies subsignal demodulation level and controls separation. S/N ratios in region A of graph 2 can be maintained at about 40dB or better by using the IF stage signal. Ideal S/N ratios, starting from a point in region A for 40dB stereo S/N toward a point for 40dB mono S/N. SNC terminal(pin 8) is the base of a PNP transistor, so stereo mode ts set when Pin 8 is open and mono mode is set when it is ground. SNC terminal control is effective only when locked with pilot signals and stereo indicator is lit. External parts should be chosen in large value that do not affect the IF stage meter output circuit because SNC control currents are small.(See Graph 6). 2) Design of external circuits for SNC The recommended way of S N C characteristics to have smooth transition of separation from stereo to mono in region A of graph 2 is as follows. © Separation vs. S/N enhancement(refer to graph 5). * SNC terminal voltages vs: separation characteristics(refer to graph 3). 3) Highcut control In region B where S/N deteriorates to 40dB or worse even for monaural, the S/N as sensed by the human ear can be enhanced by suppressing levels at frequencies above approximately 7KHz. Graph 7 shows MPX output frequency characteristics(mono) provided by voltages impressed on pin 7. Frequency characteristics for a 100% high cut can be designated by an external cap- acitor connected to pin 4. The designation is made by the SKM and the C time constant. INPUT. 0.01 AW 0.033 21 © 0.047 -25 L 0.068 -28 os

(J INFORMATION IN USING IC (continued) Graph 8 shows the relation between voltages impressed on pin 7 and rates(%) of HCC 4) Using the H CC terminal for muting. Muting function is feasible by utilizing HCC as shown below . DBL 1035 [4] Mute switch O ~o—0 2V ~5V SO“ OOHF 277" T 5) VCO damping VCO oscillations can be damped by applying a voltage not less than 7V to the HCC terminal(pin7) to induce a mono mode. And then both SNC and HCC are in an off mode.(See Graph 9) 6) Forced mono By disconnecting LED lamp at pin 10 from Vg lamp, forced mono function can be attained. And then Stereo lamp is turned off but Pilot cancel and HCC function are held. LL

(TYPICAL PERFORMANCE CHARACTERISTICS Ses ok al boos SNC an HCC Opera Ro (O62) “CTT TTT Tr ° steffi oer deke T] ol Takes [| Cea =" anne LLC ae \\ceeneen CREE CASCCCETE we RNC: o AST Tes OTE [Vr i"3 Cy Yt "3 § 4lonlmmioe VON TA 1d gor lt IV IN TT, 3 Eee SN S°CET TRENT 5 peemspe NOM fi, sCeCONAY TO - aavscnny COCCERYRET? 3 oe Ne Aes COLA, wt -LIVATFREE. F HAE eine VoM 2% ose ZC oi LOAD '8 ete + ofol LANAI TTT) RAST, ee ee ee eS ee ea song sn ei ro cggp-v gn 3 tgs veg Gaon - = » os Po A mo AT af = aa aeeee ie hese (eerie Cameeaes RTT > t 17 4 PCO fora | “SOA TET ET MOP er oft | ft ft i chggp-SM ncaa re) 5, HEC Cone P Carn fan arta = al! TTT] gee Ee CIT in fo : SH PRECEFEEH -FESERSE PASSO ER sscoo bce Se POON) ESN SeTHEEPSS Poo) Pe DREE ES | -Eo

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SSCOTTTN ice * TEPER 23 5710 23 830 2 or 2 3 4 5 6 7 8B 10 2 3 STK 23S 7igK 2 eee

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