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Rohm LSI Series Technical Note

Mixer & selector with 16bit d/a converters, sound path selector
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Sound Path Selector LSI Series
Mixer & Selector
With 16bit D/A Converters
BU7858KN，BU7893GU
●OUTLINE
This LSI is mounted with stereo 16bit D/A Converter and suitable for higher sound quality and miniaturization of cellular
phone with music play. BU7893GU has a 3D surround enhancement function and hence can play the wide-spreading stereo
sound from stereo speakers that are arranged nearby.
●FEATURE
1) Mounted with Stereo 16bit audio D/A converter
2) Compatible with Stereo analogue interface
3) Stereo headphone amplifier (16Ω)
4) Low-band corrective circuit in headphone amplifier
5) Volume that can adjust the gain
6) Flexible mixing function
●APPLICATION
Portable information & communication equipments such as cellular phone and PDA (Personal Digital Assistant) etc.
Cellular phone with music play
●LINEUP
Stereo audio D/A converter
Stereo audio interface format
3D surround enhancement function
3 band equalizer
Stereo headphone amplifier
Line output (600Ω driver)
Headphone
correction function
Click noise reduction function
Package
TECHNICAL NOTE
Function
amplifier
low-band
BU7858KN
16bit
16bit Right justified
16bit Left justified
18bit Right justified
16bit Right justified
IIS
No
No
16Ω driver
Yes
Built-in
Yes
(headphone only)
VQFN28
BU7893GU
16bit
IIS
Yes
Yes
16Ω driver
No
Built-in
Yes
VCSP85H3
Oct. 2007

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Summary of Contents for Rohm LSI Series

  • Page 1 TECHNICAL NOTE Sound Path Selector LSI Series Mixer & Selector With 16bit D/A Converters BU7858KN，BU7893GU ●OUTLINE This LSI is mounted with stereo 16bit D/A Converter and suitable for higher sound quality and miniaturization of cellular phone with music play. BU7893GU has a 3D surround enhancement function and hence can play the wide-spreading stereo sound from stereo speakers that are arranged nearby.
  • Page 2 ℃ Temperature -50 ～ +125 BU7893GU *1 5.8mW is decreased every 1℃ when using it over 25℃. (mounted on the ROHM standard PCB ) *2 7.0mW is decreased every 1℃ when using it over 25℃. ●RECOMMENDED OPERATING CONDITION 【BU7858KN】 Parameter...
  • Page 3 ・Audio Interface Condition Parameter Symbol Unit MCLKI Frequency fMCLK 4.096 18.432 － MCLKI Duty Ratio dMCLK － LRCLK Frequency － LRCLK Duty Ratio － BCLK Frequency fBCK 0.512 3.072 － BCLK Duty Ratio dBCK － LRCLK edge to BCLK↑ Time tLRS －...
  • Page 4 ・Audio Path(MIX) Unless otherwise specified、Ta=25℃、AVDD=2.8V、reference input level=-6dBV、f=1kHz、A-weighted 、path gain =0dB Condition Parameter Symbol Unit 1dB step ANAL_V Volume Setting － DACL 1dB step ANAR_V Volume Setting － DACR ・Audio Path (SP PREamp) Unless otherwise specified、Ta=25℃、AVDD=2.8V、reference input level =-6dBV、f=1kHz、A-weighted、path gain =0dB、 RL=33kΩ...
  • Page 5 ● REFERENCE DATA 【BU7858KN】 10.0 14.0 12.0 10.0 SUPLLY VOLTAGE : VDD(V) SUPLLY VOLTAGE : VDD(V) SUPLLY VOLTAGE : VDD(V) Fig.1 Stand-by Current Fig.2 16bit D/A Converter Fig.3 Headphone Amplifier Operation Current Operation Current -100 -100 -100 -110 -110 -110 -120 -120 -120...
  • Page 6 【BU7893GU】 SUPLLY VOLTAGE : DVDD_CORE(V) SUPLLY VOLTAGE : AVDD(V) SUPLLY VOLTAGE : DVDD_CORE(V) Fig.14 DVDD_CORE Fig.13 AVDD Standby Fig.12 DVDD_CORE Operation Current Current Standby Current (Analog melody) SUPLLY VOLTAGE : DVDD_CORE(V) SUPLLY VOLTAGE : AVDD(V) SUPLLY VOLTAGE : AVDD(V) Fig.16 DVDD_CORE Operation Operation Fig.15 AVDD...
  • Page 7 ●BLOCK CHART 【BU7858KN】 DV DD DVSS AVDD AVSS PLLC MCLKO MIX- ATT2 SEL1 SP Amp MIX- ATT3 RING ATT1 SEL2 EXTO 600Ω MCLKI 16bit 16Ω HP_R BCLK Digital Digit MIX- Audio ATT4 SEL3 CA_R LRCLK 16bit 16Ω SDTI HP_L MIX- ATT5 SEL4 CA_L...
  • Page 8 【BU7893GU】 1μF 1μF 1μF 0.1μF SCLK CPOP RSTB COMOUT COMIN DVSS DVDD_IO DVDD_CORE AVSS AVDD CSTEP VREF CPOP ANAINL Stereo Analog Interface ANAINR 6800p HPOL 100μ (From Melody LSI) DACL 16Ω -6dB DACR CLKI 19.2MHz/ 19.68MHz/ -6dB PLLC HPOR 100μ 19.8MHz DACL 16Ω...
  • Page 9 ●DIGITAL INTERFACE OF 16BIT AUDIO D/A CONVERTER 16bit audio D/A converter equipped with this series can be used with the following audio format. 【BU7858KN】 1) MSB first 16bit data (Right justified) LRCLK(fs) BCLK(64fs） Don’t Care Don’t Care 14 13 12 11 SDTI 15:MSB, 0:LSB 2) MSB first 18bit data (Right justified)
  • Page 10 【BU7893GU】 1. MSBファースト前詰フォーマット MSB first left justified format LRCLK 13 14 15 16 17 18 29 30 31 13 14 15 16 17 18 29 30 31 BCLK Don't Don't Don't Don't 15 14 13 15 14 13 care care care care 2.
  • Page 11 The frequency characteristic (theorical value) when the recommended constants are used is shown below. Amplifier output After correction Before correction 1000 10000 100000 Frequency [Hz] Fig.31 Low-band corrective circuit Frequency characteristic ●CPU INTERFACE BU7858KN and BU7893GU can be controlled by using CPU interface. 【BU7858KN】...
  • Page 12 【BU7893GU】 ・Timing Chart SCLK AD[6] AD[5] AD[4] AD[0] Direction DT[7] DT[6] DT[1] DT[0] When direction is "1": Write operation Tscss When direction is "0": Read operation ・Write Operation SCLK AD[4] AD[0] DT[7] DT[6] DT[1] AD[6] AD[5] DT[0] Direction”H” ・Read Operation (mode 1): SO_ENABLE (bit0 at register address 14h)=0 SCLK AD[6] AD[5]...
  • Page 13 C INTERFACE ●I 【BU7893GU】 In the BU7893GU, the LSI can be controlled by using I C interface. is based on The device’s address (slave address) is "1100011(63h)". It the Philips I C-BUS V2.1’s fast-mode, the maximum transfer rate of a bit is 400kbps. C Slave addresses ・Bit Transfer A data is transferred during the HIGH period of the clock .
  • Page 14 ・Writing Protocol The write protocol is shown below. The register address is transferred in a byte after the slave address and write command are transferred. The third byte writes the data into the internal register that is indicated by the second byte. After that, the register address is incremented on automatically (when the register address is between 00h and 16h).

  • Page 15: Pin Function

    ・Timing Diagram （Repeated） STOP BIT 7 BIT 6 START Acknowledge condition conditions t SU;STA t LOW t HIGH 1/f SCLK t BUF t HD;STA t SU;DAT t HD;DAT t SU;STO Fig.35 I C Timing Diagram DVDD_IO=1.62～3.3V、Ta=-30～+85℃ Item Symbol Unit Conditions Hold Time at Start Condition －...
  • Page 16 Equivalent Pin Name Pin function Power Circuit Diagram Low-band Correction Capacitor for Headphone Amplifier CA_L AVDD L-ch HP_L O Headphone Amplifier Output L-ch AVDD AVSS - Analog Ground － － AVDD - Analog Power Supply － － EXTO O 600Ω Driver Output AVDD O Line Output for Speaker AVDD...
  • Page 17 【BU7893GU】 Terminal Equivalent Matrix Conditions Pin Name Pin Function Power Circuit Diagram at Reset AVDD Analog Power Supply － AVDD － AVSS Analog Ground － AVDD － ANAINL DAC L-ch Input － AVDD ANAINR DAC R-ch Input － AVDD HPOL O Headphone Amplifier Output L-ch Pull-down AVDD...
  • Page 18 Schmitt Trigger Schmitt Trigger INOUT INOUT IN/OUT IN/OUT Fig.37 Equivalent Circuit Diagrams (BU7893GU) 18/24...
  • Page 19 ●RECOMMENDED SEQUENCE 【BU7858KN】 Mode Setting Flow Power Supply ON Power Supply OFF Reference Voltage ON Stand-by mode (VCOM=1) RESET Input Path Setting NRST=0 or Mixing Path Setting PLLPDN=0, VCOM=0 Analog Power ON HPAMP RESET (PDN=1) (HPRST=0) PLL Setting Analog Power OFF (PLLPDN=1) (PDN=0) (Using PLL)
  • Page 20 【BU7893GU】 SAMPLE# AUDIO PATH+ AUDIO DAC BLOCK SETTING SEQUENCE After powering up and canceling reset, set paths according to the sequence shown as below: (1) Start up reference voltage Start up the reference voltage in the REF_PWR register (00h). To start up the VREF block fast, set the REF_ON bit (bit-0) and BST_ON bit (bit-1) to "1" simultaneously. After starting up the reference voltage startup, set just the BST_ON bit (bit-1) to "0".

  • Page 21: Power-Down Sequence

    PATH MODIFICATION SEQUENCE (1) Set output mute Put the output driver amplifier in a mute state by setting the DRV_MT register (0Ch). (2) Caution concerning interim between setting mute and ramping down output driver amplifier After setting the DRV_MT register (0Ch), wait the sequence time that is set in the OVR_TM register (0Ah) before subsequently ramping down the output driver amplifier.

  • Page 22: Caution On Use

    ●CAUTION ON USE 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 special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc.
  • Page 23 ●PARTS ORDER NUMBER － ROHM Parts Code Model No. Package Code Taping Code KN=VQFN E2=Reel type, Embossed carrier tape － ROHM Parts Code Model No. Package Code Taping Code GU=VCSP E2=Reel type, Embossed carrier tape VQFN28 <Dimension> <Tape and Reel information>...
  • Page 24 Catalog No.07T253A '07.10 ROHM ©...
  • Page 25 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.

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