Audio Accessory ICs for Mobile Devices Voice/Audio Mixer & Selector IC No.10087EAT02 BU7831KN Description BU7831KN is the sound path selector which include 3 stereo inputs, Stereo headphone amp, 600 driver amp, and 2stereooutputs. Each output have a mixer and an attenuator, you can set the variable audio path setting. The variable audio source can connect to Headphone and speaker through this LSI. Feature 1) It has 3stereo inputs. 2) It has analog mixer on each input. 3) It matches for the application used the Headphone because it has 16 audio driver. 4) 16 driver has the pop-noise less function. 5) The attenuator of 16 driver has soft changing and muting function. 6) It has 600 driver for external output. 7) It included stereo output for stereo speaker. 8) VQFN20 small package Applications It is for portable equipments with audio player. Absolute maximum ratings Parameter Symbol Ratings Unit Supply voltage VDD -0.34.5 V *1 Power dissipation Pd 530 mW Operating temperature range Topr -30+85 Storage temperature range Tstg -55+125 *1 Reduce by 5.3 mW/ over 25 Recommended operating range Ratings Parameter Symbol Unit Min. Typ. Max. Supply voltage VDD 2.5 3.0 3.3 V www.rohm.com 2010.09 - Rev.A 1/16 2010 ROHM Co., Ltd. All rights reserved. Technical Note BU7831KN Electric Characteristics Unless otherwise specified, Ta=25 ,AVDD=DVDD=3.0V Analog Part Limits Parameter Symbol Unit Conditions Min. Typ. Max. Stand-by current Istb - - 3 A Stand-by mode Operation current 1 Idd1 - 0.26 0.42 mA BIAS part. No signal ST1R, ST1L to HPR, HPL Operation current 2 Idd2 - 2.3 3.7 mA Exclude Idd1, No signal Total harmonic distortion 1 (HPL, HPR) THDhp1 - 0.05 0.5 % Vo=-10dBV, 20kHzL PF Output power 1(HPL, HPR) PO1 - 10 - mW THD=10%, RL=16 Output Noise Voltage 1 (HPL, HPR) V - -94 -80 dBV JIS A weighting NO Maximum output level 1 (SPL, SPR) VO 2.0 - - Vp-pTHD1%, RL=10k MAX1 Maximum output level 2 (EXTO) VO 2.0 - - Vp-p THD1%, RL=600 MAX2 Digital input (DC) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Input L level voltage V - - 0.7 V IL Input H level voltage V 2.1 - - V IH Input current I - - 2 A 0V, 3V force IN CPU interface Limits Parameter Symbol Unit Conditions Min. Typ. Max. Cycle Time tcyc 250 - - ns Input Data Hold Time tdh 50 - - ns Input Data Setup Time tds 50 - - ns Chip Select Setup Time tcs 50 - - ns Chip Select Hold Time tch 50 - - ns www.rohm.com 2010.09 - Rev.A 2/16 2010 ROHM Co., Ltd. All rights reserved.
