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TDA7335 数据表(PDF) 7 Page - STMicroelectronics |
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TDA7335 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 20 page  AUDIO MUSIC SENSOR (See Figure 2) Aim of this section is to detect interprogram spaces present on a recorded tape. Both the blanks (interprogram spaces) and the programs minimum detectable durations can be easily set by means of 2 external and inde- pendent time constants. Also the minimum detectable input signal level can be externally adjusted, by a dedicated gain network. Main blocks are: Variable gain limiter amplifier Signal detector circuitry Logic blocks able to avoid unproper operations. Operations Description (refer to the simplified schematic of Figure 2). a)The two channels left and right mean signal coming from the preamp chain (AC coupled) are added (current) at the AMS input and pre- sented to the limiter amplifier. The limiter am- plifier gain is internally fixed to 40dB, and it could be reduced by the R8 external resistor. The AMSVth threshold is fixed at 1V. The fol- lowing signal detector comparator informs of the presence of music signal (High level out) and avoids the erroneous detection of very low signal (like noise) as real program. b)The system moves in blank detection mode everytime the supply is turned on or, with power supplied, the AMS On/Off pin (to be driven by an open collector output) is turned off (T1 open). Once this condition has hap- pened, the capacitor C15 charges, defining a minimum reset time, long enough to reset the Flip-Flops FF1 and FF2 and to descharge the program detector external C7 capacitor. The charging current at the AMS SW pin is about 10 µA. It follows that the reset time (C15 x Vpin8)/IC15 is given approximately by 0.122 x C15 ns where C15 is in µF. ELECTRICAL CHARACTERISTICS (continued) DOLBY SECTION Symbol Parameter Test Condition DOLBY Min. Typ. Max. Unit RDO Dolby Output Impedance (pin 13, 18) 100 200 300 Ω S/H Signal Handling VS = 8V; THD = 1% OFF 12 13 dB B DEC 1 Decode Out f = 10KHz; VI = 0.4dB ON -1.5 0 1.5 dB B DEC 2 Decode Out f = 500Hz; VI = -22.1dB ON -26.5 -25 -23.5 dB B DEC 3 Decode Out f = 2KHz; VI = -18dB ON -26.5 -25 -23.5 dB B DEC 4 Decode Out f = 5KHz; VI = -29.7dB ON -41.5 -40 -38.5 dB B DEC 5 Decode Out f = 10KHz; VI = -29.6dB ON -41.5 -40 -38.5 dB NRl Dolby ONLow Level Pin20 0 0.8 V NRh Dolby OFF High Level Pin 20 2 VS V GENERAL (PREAMPLIFIER + DOLBY) Symbol Parameter Test Condition Min. Typ. Max. Unit THD Total Harmonic Dist. VO = 0dB; f = 1KHz Dolby OFF 0.02 0.1 % VO = 0dB; f = 1KHz Dolby ON 0.05 0.1 % VO = 0dB; f = 10KHz Dolby OFF 0.03 % VO = 0dB; f = 10KHz Dolby ON 0.08 % S/N Signal to Noise Ratio Rg = 600 Ω;VO = 0dB; Unweighted; Dolby OFF 63 dB Rg = 600 Ω;VO = 0dB; Unweighted; Dolby ON 70 dB Rg =600 Ω;VO = 0dB; CCIR/ARM; Dolby OFF 54 63 dB Rg =600 Ω;VO = 0dB; CCIR/ARM; Dolby ON 56 72 dB CS Channel Separation Rg = 600 Ω; f = 1KHz Dolby OFF 50 64 dB Rg = 600 Ω; f = 1KHz Dolby ON 70 dB CT Channel Cross Talk Rg = 600 Ω; f = 1KHz Dolby OFF 56 70 dB Rg = 600 Ω; f = 1KHz Dolby ON 75 dB TDA7335 7/20 |
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