BU7831KN

TECHNICAL NOTE Sound Path Selector LSI Series Voice/Audio Mixer & Selector BU7831KN ●Description BU7831KN is the sound path selector which include 3 stereo inputs, Stereo headphone amp, 600Ω 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) 2) 3) 4) 5) 6) 7) 8) It has 3stereo inputs. It has analog mixer on each input. It matches for the application used the Headphone because it has 16Ω audio driver. 16Ω driver has the pop-noise less function. The attenuator of 16Ω driver has soft changing and muting function. It has 600Ω driver for external output. It included stereo output for stereo speaker. VQFN20 small package ●Applications It is for portable equipments with audio player. Apr. 2006 ●Absolute maximum ratings Parameter Symbol Supply voltage VDD Power dissipation Pd Operating temperature range Topr Storage temperature range Tstg *1 Reduce by 5.3 mW/ oC over 25 oC Limits -0.3～4.5 530 *1 -30～+85 -55～+125 Unit V mW o C o C ●Recommended operating range Parameter Supply voltage Symbol VDD MIN 2.5 TYP 3.0 MAX 3.3 Unit V ●Electric Characteristics Unless otherwise specified, •Analog Part Parameter Stand-by current Operation current 1 Operation current 2 Total harmonic distortion 1 (HPL, HPR) Output power 1(HPL, HPR) Output Noise Voltage 1 (HPL, HPR) Maximum output level 1 (SPL, SPR) Maximum output level 2 (EXTO) •Digital input (DC) Parameter Input L level voltage Input H level voltage Input current •CPU interface Parameter Cycle Time Input Data Hold Time Input Data Setup Time Chip Select Setup Time Chip Select Hold Time Symbol VIL VIH IIN MIN 2.1 TYP MAX 0.7 ±2 Unit V V μA Condition o Ta=25 C、AVDD=DVDD=3.0V Symbol Istb Idd1 Idd2 THDhp1 PO1 VNO VOMAX1 VOMAX2 MIN 2.0 2.0 TYP 0.26 2.3 0.05 10 -94 - MAX 3 0.42 3.7 0.5 -80 - Unit μA mA mA % mW dBV Vp-p Vp-p Condition Stand-by mode BIAS part. No signal ST1R, ST1L to HPR, HPL Exclude Idd1, No signal Vo=-10dBV, 20kHzL PF THD=10%, RL=16Ω JIS A weighting THD≦1%, RL=10kΩ THD≦1%, RL=600Ω 0V, 3V force Symbol tcyc tdh tds tcs tch MIN 250 50 50 50 50 TYP - MAX - Unit ns ns ns ns ns Condition 2/16 ●Reference Data (Unless otherwise specified, Ta=25 oC、AVDD=DVDD=3.0V) 1.0 STAND BY CURRENT : Ist(μA) CIRCUIT CURRENT : ICC(mA) 10 10 CIRCUIT CURRENT : ICC(mA) 0.8 0.6 0.4 0.2 0.0 2.0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE : VDD(V) 8 8 6 6 4 4 2 2 0 2.0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE : VDD(V) 0 2.0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE : VDD(V) Fig.1 Stand-by current 100.00 Fig.2 Operation current At Headphone AMP part 100.00 Fig.3 Operation current Of All blocks 100.00 1.00 EXTO : THD+N (%) 10.00 HPL : THD+N (%) 10.00 HPR : THD+N (%) 10.00 1.00 1.00 0.10 0.10 0.10 0.01 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) 0.01 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) 0.01 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) Fig.4 Total harmonic Distortion (HPL) 100.00 100.00 Fig.5 Total Harmonic Distortion (HPR) 20 0 Fig.6 Total Harmonic Distortion (EXTO) SPL : THD+N (%) SPR : THD+N (%) 10.00 HPL : LINEARITY (dBV) -80 -60 -40 -20 0 10.00 -20 -40 -60 -80 1.00 1.00 0.10 0.10 0.01 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) 0.01 -100 INPUT LEVEL : VIN (dBV) -100 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) Fig.7 Total Harmonic Distortion (SPL) 20 0 EXTO : LINEARITY (dBV) 20 0 -20 -40 -60 -80 -100 Fig.8 Total Harmonic Distortion (SPR) Fig.9 Linearity (HPL) 20 0 SPL : LINEARITY (dBV) -80 -60 -40 -20 0 -20 -40 -60 -80 -100 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) INPUT LEVEL : VIN (dBV) HPR : LINEARITY (dBV) -20 -40 -60 -80 -100 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) -100 Fig.10 Linearity (HPR) Fig.11 Linearity (EXTO) Fig.12 Linearity (SPL) 3/16 20 0 SPR : LINEARITY (dBV) -70 -75 -80 Noise [dBV] Noise [dBV] 2.0 2.5 3.0 3.5 4.0 4.5 -70 -75 -80 -85 -90 -95 -100 -105 -110 2.0 2.5 3.0 3.5 4.0 4.5 SUPLLY VOLTAGE : VDD(V) SUPPLY VOLTAGE : VDD(V) -20 -40 -60 -80 -100 -100 -80 -60 -40 -20 0 INPUT LEVEL : VIN (dBV) -85 -90 -95 -100 -105 -110 Fig.13 Linearity (SPR) -70 -75 -80 Noise [dBV] Noise [dBV] Fig.14 Output Noise (HPL) -70 -75 -80 -85 -90 -95 -100 -105 -110 Fig.15 Output Noise (HPR) -70 -75 -80 Noise [dBV] -85 -90 -95 -100 -105 -110 -85 -90 -95 -100 -105 -110 2.0 2.5 3.0 3.5 4.0 4.5 SUPLLY VOLTAGE : VDD(V) 2.0 2.5 3.0 3.5 4.0 4.5 2.0 2.5 3.0 3.5 4.0 4.5 SUPLLY VOLTAGE : VDD(V) SUPLLY VOLTAGE : VDD(V) Fig.16 Output Noise (EXTO) Fig.17 Output Noise (SPL) Fig.18 Output Noise (SPR) 4/16 ●Block Diagram, Recommended application circuit, Pin assign 2.5～3.3V + VDD VSS ST1L Other Source ST1R PCM CODEC ST2L ATT1L 0～‐28ｄB 2ｄB step ATT1R 0～‐28ｄB 2ｄB step ATT2L 0/‐6ｄB ST2R ATT2R 0/‐6ｄB ST3L MIXSEL4 ATT3L 0/‐6ｄB ST3R ATT3R 0/‐6ｄB BIAS MIXSEL5 ATT6R 0～‐28ｄB 2ｄBstep ＋ － MIXSEL1 ATT4L 0～‐28ｄB 2ｄBstep － ＋ SPL MIXSEL2 ATT4R 0～‐28ｄB 2ｄBstep － ＋ Stereo Speaker Amp SPR Stereo Tuner MIXSEL3 ATT5 0～‐28ｄB 2ｄBstep － ＋ External 600Ω EXTO Stereo Melody ATT6L 0～‐28ｄB 2ｄBstep ＋ － 16Ω + HPL 100uF Stereo Head Phone 16Ω 100uF + HPR Serial CVCOM NRST SCLK SDATA NCS CSTEP CSTART + 4.7u 1uF 1uF RESET CPU I/F CPU Fig.19 Application circuit example VDD 15 VSS 14 HPR 13 CSTEP 12 CVCOM 11 HPL 16 10 ST3L CSTART 17 9 ST3R EXTO 18 BU7831KN 8 ST2L SPR 19 7 ST2R SPL 20 6 ST1L 1 SCLK 2 SDATA 3 NCS 4 NRST 5 ST1R Fig.20 Pin Assign 5/16 ●Input terminal equivalent circuit diagram 100kΩ(TYP) PAD PAD PAD A SCLK, SDATA, NCS, NRST B CSTEP C ST2R, ST2L, ST3R, ST3L PAD PAD PAD D ST1R, ST1L E VSS, VDD F CVCOM, CSTART PAD G HPR, HPL, EXTO, SPR, SPL About Digital input (Type A): When you will have possibility to give Hi-z for input pin, You must select from the under heads for protect the pin floated. a) Pull down with less than 10kohm b) Pull up c) Give “L” signal just before Hi-Z. Fig.21 Equivalent circuit diagram No. 1 2 3 4 5 6 7 8 9 10 Name SCLK SDATA NCS NRST ST1R ST1L ST2R ST2L ST3R ST3L Function Serial clock input of CPU I/F Serial data input of CPU I/F Chip select input of CPU I/F Reset input L=Reset Stereo 1 input for R channel Stereo 1 input for L channel Stereo 2 input for R channel Stereo 2 input for L channel Stereo 3 input for R channel Stereo 3 input for L channel No. 11 12 13 14 15 16 17 18 19 20 Name CVCOM CSTEP HPR VSS VDD HPL CSTART EXTO SPR SPL Function Reference voltage Connect capacitor for blocking pop-noise Headphone R channel output Ground Power supply Headphone L channel output Connect capacitor for blocking start up pop-noise 600Ω driver output Speaker R channel output Speaker L channel output 6/16 ●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 charge CVCOM 4.7μF 30k 30k CVCOM_OUT To the one except for the headphone amplifier output step Pre charge CSTART 1 μF 140k CSTART_OUT 140k To the headphone amplifier output step 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 200kΩ(TYP) 400kΩ(TYP) ATT1 L (R) setting 0dB setting Mute setting 7/16 200k ST1L ST1R 200k CVC O M _O U T 100k ST2L ST2R ST3L ST3R 100k 100k CVC O M _O U T Fig.23 Input pins equivalent circui ・Analog output part The following is about Analog output part (EXTO, SPL, SPR, HPL, HPR). Each output amplifier is linked path select (MIXER1～5). Because stereo output is presumed, HPL and HPR are turned ON/OFF at the same time, and with pop sound decrease function. MIXER1 MIXER2 MIXER3 MIXER4 or MIXER5 At the time of path choice At the time of path choice At the time of path choice At the time of path choice SPL output amplifier ON SPR output amplifier ON EXTO output amplifier ON HPL, HPR output amplifier ON Be careful that noise from the outside and so on doesn't turn because it becomes Hi-z though the output that isn’t used is open and there is no problem. When it is anxious, pull-down in about 100kΩ. Output Port EXTO SPL SPR HPL HPR Output impedance (DC) At ON 1.4Ω 2.2Ω 1.5Ω 0.6Ω Output impedance (DC) At OFF Hi-z Hi-z GND short 8/16 ・Attenuator Each attenuator has 16 steps (4bit), which contains mute. ATT6L and ATT6R that is attenuator of the headphone output has soft mute that decreases pop sound in switching. (ATT1 - 5 don't have this function.) The amount of software depends on a capacitor to connect to the CSTEP terminal. Decide the value of a capacitor to connect to the CSTEP terminal after you take pop volume and delay time into consideration because a fixed number becomes the bottom mostly at the time of that switching. ATT setting ATT ATT Mute HP output Thsmute Thsmute=200×103×CSTEP [S] Thsmute Fig.24 ・Analog path part About the internal pass circuit, the circuit that it has a path setting by the register turns it on. For example, when MIXSEL*_0 is chosen with either ATT, ST1R input is chosen, and a group of input amplifiers of ST1R turns it on. And a connected output amplifier is turned on when either input is chosen with MIXSEL* in the same way to the output circuit. ・Pop sound decrease circuit at the time of head phone output ON/ OFF It has the function that decreases pop sound that occurs at the time of ON/ OFF of the headphone output (HPL and HPR). When headphone output is chosen/non-chosen, it is the function that the DC output of the headphone output goes down smoothly on falling/rising. Rising time is decided by the capacitor value that it is connected to the CSTART terminal. Falling time is decided by the CSTART terminal and the coupling capacitor. Pop sound decreases as much as to be here if rising/falling is smooth. Decide the value of a capacitor to connect to the CSTART terminal after you take pop sound, rising/falling time into consideration because a fixed number becomes the bottom mostly at the time of that switching. And do settlement of timing in consideration of this time when you make it turn ON/OFF by the continuance. Pop sound is made when it switches in the middle of the descent of rising/falling. Headphone ON/OFF Headphone Output (DC) Thpout Thpout=80.6×103×CSTART[S] Fig.25 9/16 ・Digital part Input such as clock, data is to input "H" or "L" properly about each digital input terminal to contain at the time of standing by as well. If you turn off the power (When Hi-z is input), a control side is to avoid an input terminal's becoming open in either following method It has the possibility that penetration electric current occurs because it becomes the input which isn't fixed as BU7831KN when it isn't avoided. a） Terminal, in less than 10kΩ, pull-down b） Terminal, pull-up c） When it becomes input Hi-z, "L" is given to it. ・CPU interface NCS tcs tcyc tch SCLK tds tdh A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 SDATA A7 Fig.26 th SDATA will be confirmed by 16 clock that is inputted after NCS falling edge, and then serial data reflect to internal register by NCS falling edge. The data format is 16bit rear. CPU I/F is 1Byte=16bit. Because it doesn't cope with continuous data transmission, you must surely insert the section of NCS= "H" between 1st Byte and 2nd Byte. The following the is to secure time beyond the SCLK 1 clock. （th≧tcyc） th NCS SCL SDATA Fig.27 10/16 Using in the BU7831KN dedicated line is recommended with a CPU I/F. Control it by a sequence like the bottom when you don't do special control. NCS CPU SCLK SDATA BU7831KN Other NCS_OTH Fig.28 CPU I/F input signals waveforms IC NCS NCS_OTH SCLK SDATA BU7831KN Control Other IC Control Fig.29 BU7831KN Control Please NCS of BU7831KN is set “H” when you control the other IC. When NCS is "H", the register of BU7831KN can't write it. note ) NCS_OTH is based on the specifications of other IC's. 11/16 ●Recommended operation sequence VDD ON NRST＝L start. Rise up VDD first. After the mode setting, input the audio signal. VDD NRST CPU I/F Audio Signal Fig. 30 VDD OFF HPRST=0(82h=00h) is taken at the time of use of HPAMP first. VDD OFF, after the mute on setting（88h=FFh）, NRST=L at using HPAMP. VDD OFF, after NRST=L at not using HPAMP. Mode Set Analog Signal HPRST(82h) ATT6L,R(88h) NRST VDD 01h XXh 00h FFh Headphone output Fig. 31 HPAMP ON Mute OFF (HPRST 82h bit0), after the mode setting. CPU I/F Mode Set Headphone output（DC） HPRST (82h bit0) Thpout Thsmute Fig. 32 12/16 ・HPAMP OUTPUT rise time setting up expression Thpout = 80.6 × 103 × CSTART [s] (typ) ・HSMUTE delay time setting up expression Thsmute = 200 × 103 × CSTEP [s] (typ) HPAMP OFF HPRST=0(82h bit0) is set up first. Other setups are canceled after ATT6L, R is set up in the mute(88h=ffh). HPRST (82h bit0) ATT6L,R (88h bit7-0) XXh FFh Path lifting CPU I/F Headphone output Thsmute Fig. 33 HPAMP Volume Control As the mute time is set by capacitor connected CSTEP pin, Volume control it is set after enough time. The delay time is as same as Thsmute. Volume control bit Headphone output Thsmute Fig. 34 Thsmute 13/16 Mode Setting Flow Power Supply ON Power Supply OFF Reference Voltage ON (VCOM＝1) Stand-by mode RESET (NRST=0 or VCOM=0) INPUT Path setting MIXING Path setting *１ Analog Power OFF (PDN＝0) *2 Analog Power ON (PDN＝1) HPAMP MUTE ON （Using HPAMP） HPAMP RESET lifting （Using HPAMP） HPAMP RESET setting （Using HPAMP） OUTPUT *1 : When the analog path setting is not changed. (Repeat output) *2 : When the Power supply OFF, after output. Fig. 35 14/16 ●Cautions on use 1) Absolute maximum ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2) Operating conditions Characteristics are guaranteed under the conditions of each specified parameter. 3) Reverse polarity connection of the power supply Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply lines. An external direction diode can be added. 4) Power supply line Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and supply line, separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power supply terminals to ICs, connect a capacitor between the power supply and the GND terminal. When applying electrolytic capacitors in the circuit, note that capacitance characteristic values are reduced at low temperatures. 5) GND voltage GND potential should maintain at the minimum ground voltage level. Furthermore, no terminals should be lower than the GND potential voltage including electric transients. 6) Short circuit between terminals and GND or other devices Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals to GND, or other components on the circuits, can damage the IC. 7) Operation in a strong electromagnetic field Using the ICs in a strong electromagnetic field can cause operation malfunction. 8) Inspection with set PCB During testing, turn on or off the power before mounting or dismounting the board from the test board. Do not power up the board without waiting for the output capacitors to discharge. The capacitors in the low output impedance terminal can stress the device. Pay attention to the electro static voltages during IC handling, transportation, and storage. 9) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and breakdown of the input terminal. Therefore, pay thorough attention not to apply a voltage lower than the GND to the input terminals. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied, apply a voltage lower than the power supply voltage to the input terminals, or a voltage within the guaranteed value of electrical characteristics. 10) Ground wiring patterns The power supply and ground lines must be as short and thick as possible to reduce line impedance. Fluctuating voltage on the power ground line may damage the device. 11) External capacitor When using external ceramic capacitors, consider degradation in the nominal capacitance value due to DC bias and changes in the capacitance with temperature. 15/16 ●Power Dissipation 700 600 530mW 500 This value is the measurement value that was mounted on the PCB by ROHM Material : Size: Grass epoxy Pd（W) 400 300 200 70mmX70mmX1.6mm 100 0 0 25 50 75 Ta（℃） 100 125 150 Fig.36 ●Ordering type name selection B U 7 8 3 1 K N － E 2 ROHM type name part number package type name KN=QFN taping type name E2 = embossed reel tape 16/16 Catalog NO.05T294Be '06.4 ROHM C Appendix Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM CO.,LTD. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact your nearest sales office. ROHM Customer Support System www.rohm.com Copyright © 2009 ROHM CO.,LTD. THE AMERICAS / EUROPE / ASIA / JAPAN Contact us : webmaster @ rohm.co. jp 21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan TEL : +81-75-311-2121 FAX : +81-75-315-0172 Appendix-Rev4.0