PDF TDA9800 Data sheet ( Hoja de datos )

Número de pieza	TDA9800
Descripción	VIF-PLL demodulator and FM-PLL detector
Fabricantes	NXP Semiconductors
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No Preview Available ! INTEGRATED CIRCUITS DATA SHEET TDA9800 VIF-PLL demodulator and FM-PLL detector Preliminary speciﬁcation File under Integrated Circuits, IC02 July 1994 1 page Philips Semiconductors VIF-PLL demodulator and FM-PLL detector Preliminary speciﬁcation TDA9800 FUNCTIONAL DESCRIPTION Vision IF input The vision IF amplifier consists of three AC-coupled differential amplifier stages; each stage comprises a controlled feedback network by means of emitter degeneration. IF and tuner AGC The automatic control voltage to maintain the video output signal at a constant level is generated according to the transmission standard. Since the TDA9800 is suitable for negative modulation only the peak-sync level is detected. The AGC detector charges and discharges the capacitor on pin 19 to set the IF gain and the tuner gain. The AGC capacitor voltage is transferred to an internal IF control signal, and is fed to the tuner AGC to generate the tuner AGC output current on pin 12 (open-collector output). The tuner AGC voltage take over point is adjusted on pin 3. This allows the tuner and the IF SAW filter to be matched to achieve the optimum IF input level. Frequency detector, phase detector and video demodulator The IF amplifier output signal is fed to a frequency detector and to a phase detector. During acquisition the frequency detector produces a DC current which is proportional to the frequency difference between the input and the VCO signal. After frequency lock-in the phase detector produces a DC current proportional to the phase difference between the VCO and the input signal. Via the loop filter the DC current of either frequency detector or phase detector is converted into a DC voltage, which controls the VCO frequency. The video demodulator is a linear multiplier, designed for low distortion and wide bandwidth. The vision IF input signal is multiplied by the in-phase component of the VCO output. The demodulated output signal is fed via an integrated low-pass filter (fg = 12 MHz) to the video amplifier for suppression of the carrier harmonics. with 90 degree phase difference independent of frequency. Video ampliﬁer, buffer and noise clipping The video amplifier is a wide bandwidth operational amplifier with internal feedback. A nominal positive modulated video signal of 1 V (p-p) is present on the composite video output (pin 13). The input impedance of the 7 dB wideband buffer amplifier (with internal feedback) is suitable for ceramic sound trap filters. The CVBS output (pin 7) provides a positive video signal of 2 V (p-p). Noise clipping is provided internally. Sound demodulation The FM sound intercarrier signal is fed to pin 11 and through a limiter amplifier before it is demodulated. This achieves high sensitivity and high AM suppression. The limiter amplifier consists of seven internal AC-coupled stages, minimizing the DC offset. The FM-PLL demodulator consists of an RC-oscillator, loop filter and phase detector. The oscillator frequency is locked on the FM intercarrier signal from the limiter amplifier. As a result of this locking, the RC-oscillator is frequency-modulated. The modulating signal voltage (AF signal) is used to control the oscillator frequency. By this, the FM-PLL operates as an FM demodulator. The audio frequency amplifier with internal feedback is designed for high gain and high common mode rejection. The low-level AF signal output from the FM-PLL demodulator is amplified and buffered in a low-ohmic audio signal output stage (pin 9). An external decoupling capacitor on pin 10 removes the DC voltage from the audio amplifier input. By using the sound mute switch (pin 5) the AF amplifier is set to mute state. VCO and travelling wave divider The VCO operates with a symmetrically-connected reference LC-circuit, operating at double vision carrier frequency. Frequency control is performed by an internal varicap diode. The voltage to set the VCO frequency to the actual frequency of double vision carrier frequency, is also amplified and converted for the AFC output current. The VCO signal is divided-by-two in a travelling wave divider, which generates two differential output signals July 1994 5 5 Page Philips Semiconductors VIF-PLL demodulator and FM-PLL detector Preliminary speciﬁcation TDA9800 SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT FM sound limiter ampliﬁer (pin 11) note 17 Vi FM αAM R11 B input signal (RMS value, pin 11) CCIR468-4 for S/N = 40 dB see Fig.11 − 200 300 µV for AM suppression αAM = 40 dB AM: f = 1 kHz; m = 0.3 − 1 − mV maximum input signal handling 200 − − mV (RMS value) AM suppression see Fig.10; 46 50 − AM: f = 1 kHz; m = 0.3 dB input resistance 480 600 720 Ω −3 dB IF frequency response of sound IF lower and upper cut-off frequency 3.5 − 10 MHz V11 DC voltage 2.3 2.6 2.9 V FM-PLL sound demodulator and AF output (pin 9) note 17 fi FM catching range of PLL 4 − 7 MHz holding range of PLL 3.5 − 8 MHz tacqu Vo AF acquisition time AF output signal (RMS value, pin 9) ∆fAF = ±27 kHz; see Fig.11 − − 4 µs 280 350 420 mV maximum output signal handling THD < 1.5% 0.8 − − V ∆Vo temperature drift of AF output signal −3 ∆fAF frequency deviation THD < 1.5%; note 18 − − V10 DC voltage at decoupling capacitor voltage dependent on 1.2 − VCO frequency; note 19 7 10-3 dB/K ±50 kHz 2.2 V R9 output resistance RL load resistance (pin 9) − 100 − 2.2 − − Ω kΩ V9 DC voltage B −3 dB audio frequency bandwidth 1.6 2.0 2.4 V 95 120 − kHz THD total harmonic distortion without ceramic ﬁlter − 0.1 0.5 % S/N (W) signal-to-noise ratio, weighted CCIR468-4; see Fig.11 50 55 − dB VSC residual sound carrier and harmonics (RMS value) − − 75 mV RR ripple rejection on pin 9 see Fig.9 26 30 − dB Measurements from IF input to audio output (pin 9) 560 Ω between pins 13 and 11; note 20 S/N (W) weighted signal-to-noise ratio 6 kHz sinusoidal waveform black picture white picture colour bar 27 kHz FM deviation; CCIR468-4; 50 µs (75 µs at standard M) de-emphasis; with offset alignment on pin 4 black-to-white 39 46 − dB sync only 40 48 − dB 39 46 − dB 39 46 − dB July 1994 11 11 Page

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