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BU7831KN-E2 датащи(PDF) 7 Page - Rohm |
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BU7831KN-E2 датащи(HTML) 7 Page - Rohm |
7 / 17 page Technical Note 7/16 www.rohm.com 2010.09 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. BU7831KN ● Detail explanation of each function blocks ・ Reference Voltage (Bias part) The reference voltage occurrence part that decides the operating point of a group of internal amplifiers is the following. CVCOM_OUT, CSTART_OUT, all is about 1/2VDD[V], and therefore the level of internal signal becomes about 1/2VDD[V], too. CVCOM has a pre-charge function, and it is possible to shorten of rising time of the bias in ON. (As for the CVCOM, ON/OFF of the pre-charge function is possible with a register bit.) CSTART terminal is used as a reference voltage of the output amplifier of the headphone, and it included pop sound low stage function in headphone path ON/ OFF, too. Capacitor value with the outside in the figure is recommended to make the PSRR character of both standard voltages the same. Choose the thing whose character is good in Capacitor with the outside because it becomes the reference voltage of the internal circuit. Pre Pre charge charge CVCOM CSTART 30k 30k 4.7μF 140k 140k 1μF Fig.22 CVCOM, CSTRT equivalent circuit ・ Analog input part The following is about each analog. Input. Please use the coupling capacitor with the outside in consideration of frequency characteristic of input. Input DC level is about 1/2VDD[V]. Input impedance on off (input non-choice) becomes Hi-z. When an input terminal isn’t used (when an input path isn’t set up) is open, and there is no problem. But, be careful that noise from the outside and so on doesn’t turn because it becomes Hi-z. When it is anxious, pull-down in about 100kΩ. ST1L and ST1R inputs change input impedance by setting of ATT1L and ATT1R respectively. ST1L(R) input impedance ATT1 L (R) setting 200kΩ(TYP) 0dB setting 400kΩ(TYP) Mute setting CVCOM_OUT 200k 200k ST1L ST1R ST2L ST2R ST3L ST3R CVCOM_OUT 100k 100k 100k Fig.23 Input pins equivalent circui CSTART_OUT To the headphone amplifier output step CVCOM_OUT To the one except for the headphone amplifier output step |
Аналогичный номер детали - BU7831KN-E2 |
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Аналогичное описание - BU7831KN-E2 |
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