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BU7831KN-E2 датащи(PDF) 7 Page - Rohm

номер детали BU7831KN-E2
подробное описание детали  Voice/Audio Mixer & Selector IC
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
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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


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