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| U2841B Monolithic Integrated Circuit Description The integrated circuit, U2841B, is designed as a single FM-IF-amplifier and demodulator for TV sound processing with SCART switches and AF control in bipolar technology. Features D D D D IF input provided for operating with ceramic filters Minimum total harmonic distortion Low power consumption Operates alternatively with 5 V or 12 V supply voltage D Demodulator provided for operating with ceramic resonator or coil D SCART AF input / AF output D Wide volume control range D ESD protected Block Diagram Tuned reference circuit 47 pF 47 pF Deemphasis 4.7 nF 93 7519 IF input 4 16 5 6 7 8 SCART 9 AF output 11 kW Mute control voltage 2 2.4 V / 3.7 V V >7V S G=1 3 Vstab1 +VS G=2 15 1 Vstab2 14 10 VS < 6 V 13 Volume control 11 SCART switch AF input 12 demod. signal SCART AF input AF output (controlled) Figure 1. TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 1 (9) Preliminary Information U2841B Pin Description GND 1 16 Vin, IF 15 VS 14 Vout, AF 13 V13 12 Vin, AF (SCART) 11 VSW 10 Vin, AF 9 95 11253 VMUTE 2 C3 Vout Vout Vin Vin Cde 3 4 5 6 7 8 Pin 1 2 3 4, 5 6, 7 8 9 10 11 12 13 14 15 16 Symbol GND VMUTE C3 Vout Vin Cde Vout, AF (SCART) Vin, AF VSW Vin, AF (SCART) V13 Vout, AF VS Vin, IF Vout, AF (SCART) Function Ground Mute control voltage Capacitor (internal reference voltage) Limiter amplifier output Reference circuit (demodulator) Deemphasis AF output (SCART) AF input (demodulated signal) SCART switch AF input (SCART) Volume control AF output, controlled Supply voltage FM IF input Circuit Description The bipolar circuit U2841B contains the complete FM intercarrier sound processing (mono) with additional AF volume control, SCART switches and external mute control. The circuit operates alternatively with 5 V or 12 V supply voltage. Circuit operation is as follows: Through an external ceramic bandpass filter, which is tuned to the sound carrier frequency, the intercarrier signal is fed via a 9-stage limiting amplifier to the FM demodulator. This quadrature demodulator works alternatively with an external L-C reference circuit or with a ceramic resonator. The AF signal is available at Pin 9 (AF output*SCART), and via the SCART switch and volume control at Pin 14 (AF output*controlled). The demodulated AF signal at Pin 10 (AF input*demodulator signal) or an external signal at Pin 12 (AF input*SCART) will be selected by the SCART switch and supplied to the volume control. In dependence on supply voltage the gain of controlled AF output (Pin 14) will be switched over: a) Supply voltage range 4.7 < VS < 6.0 V: gain of AF output amplifier G = 2. In this case the AF input signal at Pin 12 (SCART input) must be reduced by an voltage divider. b) Supply voltage range 7.0 < VS < 12.5 V: gain of AF output amplifier G = 1. 2 (9) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 U2841B Absolute Maximum Ratings Reference point Pin 1, unless otherwise specified Supply voltage Supply current External voltage External voltage Junction temperature Ambient temperature Storage temperature Parameters Pin 15 Pin 15 Pins 2, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14 and 16 Pin 11 Symbol VS IS Vext Vext Tj Tamb Tstg Value 12.5 33 5 VS 125 -25 to +85 -25 to +125 Unit V mA V V C C C Thermal Resistance Parameters Junction ambient Symbol RthJA Value 90 Unit K/W Electrical Characteristics Tamb = 25C, VS = 12 V, reference point Pin 1, unless otherwise specified Parameters Supply voltage Supply current IF frequency range DC output voltage AF output voltage Total harmonic distortion Input limiting voltage AM suppression VS VS S S Test Conditions / Pins Pin 15 Symbol VS IS fIF VDC VAF THD Vin GAM t 6 V Pin 15 u7V Pin 16 V t6V Pins 9 and 14 V u7V f +1 kHz Pins 9 and 14 D + "30 kHz f +1 kHz Pins 9 and 14 D + "30 kHz mod f mod f Min 4.7 7.0 Typ Max 6.0 12.5 Unit V mA 22 28 3.5 2.4 3.7 600 0.5 12 MHz V mV % Input resistance Allowable external load resistor, AF output Control range V13 AF volume control Gain between SCART input VS and controlled AF output VS TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 AF output sign -3 dB Pin 16 Vin 20 mV, Pins 4 and 5 f 5.5 MHz fmod 1 kHz Reference signal: kHz Df Test signal: m Pin 16 Pins 9 and 14 + + + +"30 150 60 mVeff dB +30% Rin RL A G 820 3 80 6 0 W kW dB dB +0 *4 V Pin 14 t 6 V Pins 12 - 14 u7V 3 (9) Preliminary Information U2841B Parameters Max. SCART input voltage Max. AF output voltage (controlled output) Control voltage (SCART switch) Control voltage (MUTE switch) t6V V u7V V t6V V +4 V V u7V VS S S 13 S Test Conditions / Pins Pins 10 and 12 Pins 10 and 12 Symbol Vin max Min 1 2 1 2 2 0 4 0 Typ Max Unit Veff VAF max Veff Record Play Mute on Pin 11 Pin 11 Pin 2 V V 2 VS 2 V V Circuits AF output AF input SCART (controlled) VS < 6 V VS > 7 V Volume control SCART switch 2.2 mF IF input 22 mF 22 nF SFE 5.5 MC 16 15 14 13 12 11 10 9 2.2 mF 2.2 mF 36 kW VS < 6 V 1 mF VS > 7 V AF output SCART +VS U2841B 937520 1 2 3 2.2 mF 4 5 6 300 W 7 8 4.7 nF 270 W 82 pF Deemphasis CDA 5.5 MC Reference circuit (demodulator) Mute switch Figure 2. Test circuit 4 (9) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 U2841B Internal Pin Circuit Diagrams 20 kW 2 3.4 V 93 7509 Figure 3. Pin 2: Mute switch 4.1 V 3 93 7510 Figure 4. Pin 3: Internal reference voltage 93 7511 4 5 1.8 kW 1.8 kW Figure 5. Pin 4, 5: Limiter amplifier output TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 5 (9) Preliminary Information U2841B Internal Pin Circuit Diagrams (continued) 4.1 V 6 10 kW 7 10 kW 93 7512 Figure 6. Pin 6, 7: Reference circuit, demodulator 200 W 2.4 V/3.7 V 150 W 9 11 kW 93 7513 8 Figure 7. Pin 8, 9: Deemphasis and AF output (SCART) 50 kW 10 50 kW 12 93 7514 Figure 8. Pin 10, 12: AF input (demod. signal) and AF input (SCART) 6 (9) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 U2841B Internal Pin Circuit Diagrams (continued) 11 15 kW 10 kW 93 7515 Figure 9. Pin 11: SCART switch 13 150 W 3.2 V 93 7516 Figure 10. Pin 13: Volume control 200 W 2.4 V/3.7 V 15 kW/ 30 kW 14 150 W 3 kW 93 7517 Figure 11. Pin 14: AF output (controlled) TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 7 (9) Preliminary Information U2841B Internal Pin Circuit Diagrams (continued) 16 820 W 1.8 V 93 7518 Figure 12. Pin 16: IF input Dimensions in mm Package: DIP16 94 9128 8 (9) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 U2841B Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423 TELEFUNKEN Semiconductors Rev. A1, 17-Jul-96 9 (9) Preliminary Information |
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