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TA2123AF Folha de dados(PDF) 7 Page - Toshiba Semiconductor |
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TA2123AF Folha de dados(HTML) 7 Page - Toshiba Semiconductor |
7 / 20 page TA2123AF 2002-10-30 7 Application Note 1. Preamplifier stage (1) Output DC voltage of preamplifier Output DC voltage of preamplifier is determined by external resistors R1 and R2 as shown in Fig.1. VO (PRE) = VREF OUT-∆V × (R2 / R1 + 1) Fig.1 Output DC voltage of preamplifier · VREF OUT = 0.73V (typ.) · ∆V is an offset voltage which is designed to 28.6mV. It is as follows in case that the DC voltage is calculated by the constant of a test circuit. VO (PRE) = 0.73V-28.6mV (200kΩ / 22kΩ + 1) =0.44V Output DC voltage of preamplifier should be fixed about VCC / 2, because preamplifier get a enough dynamic range. (2) AMS (automatic music sensor) function A block diagram is shown in Fig.2. This function can AMS (automatic music sensor) and BS (blank skip). · The comparator input level is higher than comparator sensitivity. →Rectangle wave is outputted. · The comparator input level is lower than comparator sensitivity. →High level is outputted. The sensitivity changeover is determined by AMS switch (the comparator sensitivity doesn’t change.). · Automatic music sensor mode The AMS SW is also turned on when the MT SW is turned on. And the comparator input level is determined by external resistors (R4~R6) and capacitors (C3, C4) from mixer amplifier output level. The transfer function is as follows. VO / Vi = R3 / [R1・R2 / (R1 + R2)] × {jωC4・R5・R6 / [R4・R5 + jω (C3・R4・R5 + C4・R4・R5 + C4・R4・R6 + C4・R5・R6) - ω2C3・C4・R4・R5・R6]} + − ⊿ V = 28.6mV VREF OUT R1 R2 |
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