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AN7195 Datasheet(PDF) 10 Page - Panasonic Semiconductor |
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AN7195 Datasheet(HTML) 10 Page - Panasonic Semiconductor |
10 / 12 page AN7195K ICs for Audio Common Use 10 s Technical Information (continued) [2] Application note (continued) 8. Mute Function 1) The mute-on/off is possible by making pin 7 (the muting terminal) high or low. 2) The muting circuit is as shown in figure 6. The amplifier gain including attenuator block is given in the following equation : GV = I1 × 50 I2 Original gain From the above equation, the amplifier gain can be made as 0 time by setting I1 at 0 mA at muting. 3) The threshold voltage of VMUTE is as follows : Mute-off : approx. 1 V or less Mute-on : approx. 3 V or more Figure 6 4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (In figure 6 4.7 k Ω,10 µF), the above mentioned times are as follows : Attack time : Approx. 30 ms Recovery time : Approx. 40 ms However, the control voltage of VMUTE is assumed to be 5 V. When it is not directly controlled by microcomputer (5 V), (that is, 13.2 V separate power supply), it is necessary to change CR values because the above times change. 5) When the attack time and recovery time are set at 20 ms or less, pay attention to the IC with larger output offset because it may release the shock noise. 9. Voltage gain The voltage gain is fixed at 40 dB and can not be changed by the addition of an external resistor. 5 k Ω 7 4.7 k Ω 5 V 0 V 10 µF I2 I1 I2 I1 I1 = approx.120 µA I2 = approx.120 µA Output stage Input Output stage Attenuator block VMUTE Mute/off Mute/on |
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