TDA4483 Intercarrier Mixer and AM-Demodulator for TV and VCR Features D Very high input sensitivity D Excellent signal-to-noise ratio D Intercarrier output signal gain controlled and indepen- D Few external components D ESD protected dent from the picture carrier to sound carrier ratio D AM demodulator alignment free Case: DIP14 Block Diagram AGC 7 14 +VS 13 1 12 IF Input sound carrier AF output (AM) 2 10 4 Standard switch (AM / FM) 5 8 IF Input picture carrier Intercarrier output (FM) 6 93 7481 Figure 1. TELEFUNKEN Semiconductors Rev. A1, 15-May-96 1 (8) TDA4483 Pin Description Pin 1, 2 3, 9, 11 4, 13 5, 6 7 8 10 12 14 Function IF input (sound carrier) No connected Ground IF input (picture carrier) AGC time constant Intercarrier output Standard switch AF output (AM) Supply voltage 1 14 2 13 3 12 4 11 5 10 6 9 7 8 Circuit Description The bipolar circuit TDA4483 enables high quality sound IF processing for multistandard applications in TV-sets and VCR. This circuit has separate inputs for the soundand picture carrier. The sound carrier signal (single or dual carrier, modulated with AM, FM or NICAM) from the SAW filter will be fed into a 3-stage, gain controlled, IF amplifier (Pin 1 and 2). The following two mixer stages operate using different standards. In the case of AM, the first mixer works as a quasi-synchronous detector providing the audio frequency at Pin 12. Furthermore, the first mixer supplies a regulation voltage to control the gain of the 3-stage IF amplifier (AGC). The second mixer stage works as a intercarrier mixer in FM/NICAM mode and supplies the intercarrier signal at Pin 8 (difference signal between picture and sound carrier) independent of the picture carrier to sound carrier ratio. In standard B/G the 5.5/5.74 MHz subcarrier is 2 (8) available at Pin 8. The required picture carrier for the intercarrier mixer will be coupled out from the tuned demodulator circuit of the vision-IF IC (e.g. TDA4453 or equivalent components). The selective and prelimited picture carrier has to be applied symmetrically to the picture carrier input (Pin 5 and Pin 6). An additional limiting amplifier delivers the regenerated picture carrier to the intercarrier mixer. Possible modes of operation (FM/NICAM or AM) are determined by the voltage level that is applied to Pin 10 (standard switch). Without external control voltage at Pin 10, the FM/NICAM operation is automatically selected. In the case of AM, the intercarrier output Pin 8 is switched off, however DC output voltage remains. In corresponding with FM/NICAM operation, the AF output Pin 12 is switched off. TELEFUNKEN Semiconductors Rev. A1, 15-May-96 TDA4483 Absolute Maximum Ratings Reference point Pin 13 (4), unless otherwise specified. Parameters Supply voltage Supply current Power dissipation Junction temperature Operating temperature, ambient Storage temperature Pin 14 Pin 14 Symbol VS IS Ptot Tj Tamb Tstg Value 13.5 50 680 125 –25 to +70 –25 to +125 Unit V mA mW °C °C °C Symbol RthJA Value 90 Unit K/W Thermal Resistance Parameters Junction-ambient Electrical Characteristics Tamb = 25°C, VS = 12 V, reference point: Pin 13 (4), unless otherwise specified Parameters Supply voltage range Supply current DC output voltage Standard switch Control voltage Test Conditions / Pins Pin 14 FM-mode Pin 14 AM-mode Pin 8 Pin 12 Pin 10 AM-mode FM-mode Pin 10 open Symbol VS IS Min. 10 Max. 13.5 37 32 3.6 3.2 VO VCTRL Typ. 0 2.2 Unit V mA V 1.5 VS V Internal voltage FM-mode 2.3 automatically selected Control current VCTRL 5 V Pin 10 ICTRL 200 mA FM-mode Test conditions: Picture carrier fPC = 38.9 MHz, sound carrier fSC1 = 33.4 MHz, fSC2 = 33.1587 MHz, picture carrier to sound carriers ratio = 13/20 dB, picture carrier unmodulated (equivalent to sync peak pulse) f Sound carrier frequency range 30 40 MHz SC v Picture carrier input voltage Pin 5, 6 10 20 30 mV PC v Sound carrier minimal 5.5 MHz intercarrier 50 mV SC input voltage signal –3 dB Pin 1, 2 Sound carrier gain control AGC 60 65 dB range v Intercarrier output voltage Pin 8 350 mV OIC Output resistance Pin 8 RO 15 W Signal to noise ratio Test conditions: Sound carrier VSC = 10 mV, picture carrier vPC = 20 mV, limited carrier from TDA4453 or comparable vision IF circuit, reference signal: frequency deviation ∆f = ±30 kHz, sound modulation fmod = 1 kHz. Weighted (S + N)/N ratio of the demodulated intercarrier signal in accordance with CCIR468-4, measured with FM-demodulator U2829B Picture carrier unmodulated Channel 1/2 (S + N)/N 68/67 dB Black picture Channel 1/2 (S + N)/N 62/60 dB Grid Channel 1/2 (S + N)/N 50/48 dB t TELEFUNKEN Semiconductors Rev. A1, 15-May-96 3 (8) TDA4483 Parameters Test Conditions / Pins AM-mode; Test condition: sound carrier fSC = 32.4 MHz Sound carrier minimal input AF output voltage –3 dB voltage Pin 1, 2 Sound carrier gain control range AF output voltage m = 54%, fmod = 1 kHz Pin 12 Total harmonic distortion m = 80%, fmod = 1 kHz Pin 12 Allowable external resistance Pin 12 Output resistance Pin 12 Symbol Min. Typ. Max. Unit 50 mV 65 dB vAF 500 mV THD 1.5 vSC AGC 60 Rext RO 3.0 % kW 3 30 W Test Circuit AF output (AM) +VS Intercarrier output (FM) Standard switch (AM / FM) 22 mF 10 nF 14 13 12 11 10 9 8 5 6 7 93 7482 TDA4483 1 2 3 4 10 mF AGC Sound carrier Picture carrier from vision circuit Figure 2. 4 (8) TELEFUNKEN Semiconductors Rev. A1, 15-May-96 TDA4483 Internal Pin Circuit Diagrams 2 1 1.5 kW 1.5 kW 5.3 V 4.7 kW 93 7483 Figure 3. Pin 1, 2 - Sound carrier input 5 6 5.6 kW 5.6 kW 5.3 V 1.2 kW 93 7484 Figure 4. Pin 5, 6 – Picture carrier input TELEFUNKEN Semiconductors Rev. A1, 15-May-96 5 (8) TDA4483 93 7485 500 W 1 kW 8 100 W 7 2 mA 93 7486 Figure 5. Pin 7 – AGC time constant 10 Figure 6. Pin 8 – Intercarrier output, FM-mode 20 kW 2 kW 93 7487 Figure 7. Pin 10 – Standard switch (AM or FM/NICAM) 6 (8) TELEFUNKEN Semiconductors Rev. A1, 15-May-96 TDA4483 300 W 12 3.5 V 1 mA AF / AM 93 7488 Figure 8. Pin 12 – AF output, AM mode Dimensions in mm 94 9128 TELEFUNKEN Semiconductors Rev. A1, 15-May-96 7 (8) TDA4483 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 8 (8) TELEFUNKEN Semiconductors Rev. A1, 15-May-96