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TDA2555 Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA2555 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 10 page March 1986 6 Philips Semiconductors Product specification Dual TV sound demodulator circuits TDA2555 TDA2557 Notes to the characteristics 1. THD < 0,1% requires a double tuned demodulator circuit (QL = 20). With a single tuned circuit a THD of < 0,5% is possible (see Fig.1 and Fig.3). 2. If higher a.c. output current is required an external resistor must be applied from output (pins 2 and 8) to ground (min. 2 k Ω) in order to improve the THD performance (−I2,8 < 4 mA). 3. The de-emphasis time constant is 50 µs. 4. Crosstalk attenuation is defined as: 5. In the MUTE state the a.f. output level attenuation is more than 60 dB. The MUTE function is only guaranteed for an r.m.s. value of the input voltage lower than 60 mV. See also Fig.2. AUDIO OUTPUT STAGE emitter follower with 1,0 mA bias current DC output voltage V2,8-14 3,0 4,0 5,0 V External DC load resistance R2,8-14 2 −− k Ω AC output current (note 2) −I2,8-14(p-p) −− 0,5 mA De-emphasis input resistance (note 3) R1,9-14 0,8 1,0 1,2 k Ω DC voltage (de-emphasis) V1,9-14 3,7 4,7 5,7 V Crosstalk attenuation f = 1 kHz (note 4) α12,21 60 −− dB Crosstalk attenuation f = 10 kHz (note 4) α12,21 60 −− dB Output impedance R2,8-14 − 25 −Ω AF output level (Fig.2, note 5) MUTE function Vi(rms) < 60 mV α 60 −− dB Switching input current V5-14 =0V −I5 −− 500 µA V5-14 =VP I5 −− 500 µA Internal d.c. voltage no mute (pin 5 not connected) V5-14 − 6,2 − V PARAMETER SYMBOL MIN. TYP. MAX. UNIT o 12 V 214 – unmodulated V814 – -------------------------------------------------------- = o 21 V 814 – unmodulated V 214 – -------------------------------------------------------- = . |
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