TDA2540/TDA2541 @PLESSEY Semiconductors TDA2540 TDA2541 TELEVISION IF AMPLIFER AND DEMODULATOR (TDA2540 for NPN tuners, TDA2541 for PNP tuners) The TDA2540 and TDA2541 are IF amplifier and demodulator circuits for colour and monochrome we impur ft 6D WF INPUT television receivers using NPN and PNP _ tuners pecouruns [] 2 60 pEcouPUNG respectively. The two circuits are in other respects IE AMP. GAIN contro (13 wf] vor swircn identical. A VCR switch is incorporated for switching off the video signal when inserting a VCR playback TUNER AGC OUTPUT []4 [] BROUNO. TDA , 2840/1 signal, AFC OUTPUT [5 120} VIDEO OUTPUT AFC SWITCH [6 0) POSITIVE SUPPLY FEATURES AFC TUNING []7 10{) AFC TUNING DEMODULATOR TUNING [Js 91} DEMODULATOR TUMNG HM Gain-Controlled Wideband Amplifier, DPI Providing Complete IF Gain , " = Synchronous Demodulator Fig. 1 Pin connections (top view) @ White Spot Inverter QUICK REFERENCE DATA Vi P og: ith Noi . 7 Meee Preampater with Noise Protection @ Supply Voltage (pin 11): 12V typ. @ AGC Circuit with Noise Gating 7 Supply current: t = 38.9MH 5OmA typ. @ Tuner AGC Output m IF Input Voltage at f = 38. 2 m VCR Switch (pins 1 & 16): 100 pV RMS typ. HM Video Output Voltage (pin 12): 3V typ. @ (IF Voltage Gain Control Range: 64dB typ. HM Signal-to-noise Ratio at Vin = 10mV: / 58cB typ. W AFC O/P Voitage Swing for Af = 100kHz (pin 6): 10V min. oh, HAH, AH, TL = AFC . AFC a \ acinta srctonous outeur 5 atc ourpur 1F INPUT Tc contaouseo : SYNCHRONOUS VIDED. vineo ouTeUt non IF AMPLIFIER DEMODULATOR PRE-AMPLIFIER AGC WHITE SPOT DETECTOR? NOISE TUNER AGC INVERTER INVERTER output & 3 ie a ues a Fig. 2 TDA2540/TDA2541 block diagrams oH 187TDA2540/ TDA2641 ELECTRICAL CHARACTERISTICS Test conditions (unless otherwise stated) : Supply voltage (pin 11) = 12V Tam = +25C Measurements referred to pin 13 Test circuits Figs. 9 & 10 : Value Characteristic Pin Units Conditions Min. | Typ.| Max. Supply Current 50 mA Supply voltage range 1 10.2} 12 13.8] V IF input voltage for onset of AGC 1-16 100 150 |uV RMS| f = 38.9 MHz Differential input impedance 1-16 2//2 kQ// pF Zero-signal output level 12 5.7| 6.0 6.3] V Top sync. output level 12 2.9} 3.07 3.2] V AFC output voltage swing 6 10 11 Vv Af = 100kHz IF voltage control range 64 dB Signal-to-noise ratio 58 dB Vin = TOrmy, See Note 1 Video amplifier 3dB bandwidth 6 MHz Differential gain 4 10 % Differential phase 2 10 deg. Carrier signal at video output 4 30 mV 2nd harmonic of carrier at video output 20 30 mV Change of frequency at AFC output voltage swing of 10V 100 200 kHz Intermodulation at 1.1MHz Blue 46 60 dB Yellow 46 50 dB See Note 2 and Figs 3 and 4 Intermodulation at 3.3MHz 46 54 aB AFC switches off at: 6 2.5| V VCR switches off at 14 1) V White spot inverter threshold 6.6 Vv White spot insertion level 47 V See Fig 5 Noise inverter threshold level 1.8 Vv Noise inversion level 3.8 Vv Typical tuner AGC output current 4 0 10 mA Tuner AGC output voltage 4 0.3|/ V l4 = 10mA Tuner AGC output jeakage current 4 15 HA Via = 3V, Va = 12V NOTES: Vout black-to-white 1. S/N =_____ Vin at bandwidth = 5MHz Vout at 4.4MHz 2. Intermodulation at 1.1MHz = 20 log -~__ Vout at 1.1MHz Vout at 4.4MHz 3. Intermodulation at 3.3MHz = 20 log -__ Vout at 3.3MHz 1008 ~32d8 PC 13-208 13-208 GENERATOR: - 3008 SPECTRUM -30dB SPECTRUM 309 Mi FOR FOR YELLOW BLUE se i 1 11 | con Se a +12 SC = Sound Carrier level ce CC = Chrominance Carrer level . GENERATOR AOJUSTED POR BLUE. Yip-1g*4 PC = Picture Carrier level all with respect to top sync. level Fig. 3 input conditions for intermodulation measurements Fig. 4 Test set-up for intermodulation standard colour bar with 75 percent contrast 188V12-13 ) 1 WHITE SPOT INVERTER 4 THRESHOLD LEVEL ZERO-SIGNAL LEVEL. 5. 6 WHITE LEVEL (CCIR} WHITE SPOT INSERTION. 5 LEVEL WOISE INSERTION LEVEL: TOP SYNC LEVEL NOISE INVERTER THRESHOLD LEVEL TIME Fig. 5 Video output waveform showing white spot and noise inverter threshold levels Ve-13 (Vv) vk 3 2 a ae +1 +2 +6 f (MHz) Fig.6 AFC output voltage (pin 5) as a function of frequency 12 Vg-13 (V) o 100 hee +100KHz Fig. 7 Expansion of Fig. 6 SIN (dB) a 20 40 6O Y1-16 {0d8 = t00pv) Fig. 8 Signal-to-noise ratio as a function of input voltage TDA2540/ TDA2541 APPLICATIONS INFORMATION HV +70V TDA 2540 z (UNDERSIDE VIEW) 56p mB CT oy mot cro VIDEO QUTPUT TUNING, VOLTAGE AFC SWITCH Fig. 9 TDA2540 typical application circuit TUNER AGC TDA 2541 {UNDERSIDE VIEW) IF IwPUT VIDEO. OUTPUT TUNING VOLTAGE AFC SWITCH ----- 3 Fig. 10 TDA2541 typical application circuit ABSOLUTE MAXIMUM RATINGS Supply voltage Tuner AGC voltage Storage temperature Operating ambient temperature 13.8V 12V 55C to +125C 10C to +60C 189