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TDA7338D Datasheet(PDF) 5 Page - STMicroelectronics |
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TDA7338D Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 11 page FUNCTIONAL DESCRIPTION Signal Path The TDA7338 Stereodecoder contains all neces- sary functions for processing the MPX signal. Due to the external input resistance (Pin 20) the circuit can be adapted to different MPX input levels. Be- hind a 80kHz lowpass filter the adjustment free PLL for the pilot Tone is placed. The only external component needed for the PLL is the ceramic resonator for the oscillator which runs at 456kHz. The pilot detector output is designed as an open collector output, therefore an external pullup re- sistor is needed. To force the decoder to ”MONO” Pin 19 has to be clamped to a voltage below 0.8V. The voltage level (signal strength from the IF part) applied to Pin 15 (VHCC) allows to control the time constant of the deemphasis (nom. = 50 µs, see fig. 1). If the RF-signal is weak, the corner NOTES TO THE CHZARACTERISTICS (continued) 4. ACI (ADJACENT CHANNEL INTERFERENCE) α114 = VO (signal) (at1KHz) VO (spurious)(at4KHZ) ;fs = 110KHz - (3 x 38KHz) α190 = VO (signal) (at1KHz) VO (spurious)(at4KHZ) ;fs = 186KHz - (5 x 38KHz) measured with : 90% mono signal; 9% pilot signal; fm=1KHz; 1% spurious signal (fs = 110KHz or 186KHz, unmodulated) 5. Control range typ 11% of VR (see figure 1 and figure2) 6. MEASUREMENT OF TRIGGER THRESHOLDS All thresholds are measured by using a pulse with TR =2 µs, THIGH =2µs, and TF =10µs. The repetition rate must not increase the PEAK voltage. VTR Vin DC TR THIGH TF Time D95AU365 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 VHCC-VR(V) 0 1 2 3.18 (=50 µs) fc (KHz) VR=3.6V D95AU366 Figure 1: High Cut Control -0.40 -0.32 -0.24 -0.16 -0.08 VSB-VR(V) 0 10 20 30 40 50 SEP (dB) VR=3.6V D95AU367 Figure 2: Stereo Blend TDA7338 5/11 |
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