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TDA9610 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA9610 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 41 page  1995 Mar 21 7 Philips Semiconductors Product specification Audio FM processor for VHS hi-fi audio TDA9610H FUNCTIONAL DESCRIPTION The IC is intended for use within the audio FM system of VHS video recorders. Three modes of operation can be distinguished: • Record mode • Playback mode • Loop-through mode. Switching and control of the three modes is done by the I2C-bus. Record mode The audio signal, selected from the four stereo audio inputs (EXT1L, EXT1R, EXT2L, EXT2R, CINL, CINR, TUNL and TUNR), is fed to the volume control stage (separate for left [L] and right [R]). The information for LINOUT is, after summing of L and R, derived from either one of the four stereo inputs or the volume control output or one of the mono inputs (EXN1 and EXN2). After the Low-Pass Filter (LPF) and signal compression in the noise reduction (NR) and filter block the audio signal is available at AFOUTL and AFOUTR. The compressed signal is now FM modulated on a RF carrier in the PLL block. After low-pass filtering and summation of both RF carriers (L and R) the signal is available at FMOUT. The output select block offers the possibility to choose eight different audio signal modes: 1. Stereo. 2. Left. 3. Right. 4. Mono. 5. Normal. 6. Mixed stereo (stereo + LININ). 7. Mixed left (left + LININ). 8. Mixed right (right + LININ). These audio signal modes are selectable for the output stages LINEL, LINER and MODOUT. The standard audio output is LINEL and LINER, e.g. for SCART output. MODOUT is a mono audio output, with an overload-protecting AGC, to drive an external RF modulator. The headphone select block offers the possibility to choose either the output select signal or four independent audio signal modes (stereo, left, right and normal) for the output stages HPOUTL and HPOUTR. HPOUTL and HPOUTR, with common volume control for L and R, is suitable for direct headphone drive. DCOUTL and DCOUTR are intended for VU meter drive. It is connected to the selected stereo audio input after the volume control block. The output signal at DCOUTL and DCOUTR is proportional to the square root of the recorded audio signal (see Fig.3). Playback mode The two FM modulated RF carriers, present at the two FMINL and FMINR inputs after being band-pass filtered, are demodulated in the PLL block. The LF audio signal is fed through a sample-and-hold circuit to suppress head-switching noise. The demodulated audio signal is available at AFOUTL and AFOUTR. The audio signal is low-pass filtered and expanded in the noise reduction (NR) and filter block. The resulting audio signal is available after the output and headphone select blocks for all four output stages (LINEL, LINER, MODOUT, HPOUTL, HPOUTR, DCOUTL and DCOUTR). The functionality of the output and headphone select blocks is identical to the record mode. During playback DCOUTL and DCOUTR are connected to the headphone select block. The functionality of the input and normal select blocks is also identical to record mode (see Fig.3), which offers the possibility to control (other) audio signals independently for LINOUT (see Fig.4). Loop-through mode This mode is similar to the record mode (see Fig.3), except for the FMOUT pin, which is inactive, and the RAF output which is active LOW (see Fig.5). |
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