ROHM BU7893GU Technical data

A

Audio Accessory ICs for Mobile Devices

Mixer & Selector ICs with 16bit D/A Converter

BU7858KN,BU7893GU

●Description

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.

●Features

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

●Applications

Portable information & communication equipments such as cellular phone and PDA (Personal Digital Assistant) etc. Cellular phone with music play

●Line up matrix

Function BU7858KN BU7893GU

No.10087EAT03

Stereo audio D/A converter 16bit 16bit

16bit Right justified

Stereo audio interface format

3D surround enhancement function No Yes

3 band equalizer No Yes

Stereo headphone amplifier 16Ω driver 16Ω driver

Line output (600Ω driver) Yes No

Headphone amplifier low-band correction function Built-in Built-in

Click noise reduction function

Package VQFN28 VCSP85H3

18bit Right justified

IIS

Yes

(headphone only)

16bit Left justified

16bit Right justified

IIS

Yes

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BU7858KN,BU7893GU

●Absolute maximum ratings

Parameter Symbol Ratings Unit

Technical Note

BU7858KN VDD -0.3 ～ 4.5 V

Power-Supply Voltage

BU7893GU

DVDDIO

AVD D

-0.3 ～ 4.5

DVDDCO -0.3 ～ 2.5

*1

580

*2

Power Dissipation

Operating Temperature

BU7858KN

Pd

BU7893GU 700

BU7858KN

T

OPR

-20 ～ +85

BU7893GU -30 ～ +85

Storage Temperature

BU7858KN

T

STG

-55 ～ +125

BU7893GU -50 ～ +125

*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℃.

●Operating conditions 【BU7858KN】

Parameter Symbol

Min. Typ. Max.

Ratings

Power-Supply Voltage VDD 2.7 3.0 3.3 V

【BU7893GU】

Parameter Symbol

Min. Typ. Max.

Ratings

V

mW

℃

Unit

Analog Power-Supply Voltage AVDD 2.6 2.8 3.3 V

Digital I/O Power-Supply Voltage DVDDIO DVDDCO 1.8 3.3 V

Digital Core Power-Supply Voltage DVDDCO 1.62 1.8 1.98 V

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BU7858KN,BU7893GU

●Electrical characteristics 【BU7858KN】

Unless otherwise specified, Ta=25℃, AVDD=DVDD=3.0V ・Analog

Parameter Symbol

Min. Typ. Max.

Limits

Unit Conditions

Current Consumption Idd3 - 2.3 3.7 mA 16Ω driver part and no signal

Technical Note

DAC S/(N+D) SN+D - 85 - dB

DAC S/N SNR - 92 - dB

Headphone Amplifier Total Harmonic Distortion

Headphone Amplifier Maximum Output

Headphone Amplifier Output Noise Voltage

THDhp - 0.05 0.5 %

PO - 10 - mW fin=1kHz, THD=10%, RL=16Ω

VNO - -94 -80 dBV A-weighted

SPO Maximum Output Level VOMAX1 2.0 - - V

EXTO Maximum Output Level VOMAX2 2.0 - - V

fs=44.1kHz, fin=1kHz, 20kHz LPF, Vin=-0.5dBFS

fs=44.1kHz, fin=1kHz , A-weighted, Vin=0dBFS

fin=1kHz, 20kHz LPF, Vin=-10dBV

fin=1kHz, THD≦1%, 10kΩLoad

P-P

fin=1kHz, THD≦1%, 600ΩLoad

P-P

・Digital (DC)

Parameter Symbol

Min. Typ. Max.

Digital Input Voltage “L” VIL - -

Digital Input Voltage “H” VIH

0.8 x

DVDD

Limits

0.2 x

DVDD

Unit Conditions

V

- - V

Digital Output Voltage “L” VOL - - 0.5 V Iol=-500µA

Digital Output Voltage “H” VOH

DVDD

-0.5

- - V Ioh=500µA

Input Leakage Current 1 IIN1 - - ±2 µA at 0V, 3V

・Audio Interface

Parameter Symbol

Min. Typ. Max.

Limits

Unit Conditions

MCLKI Frequency fMCLK 4.096 - 18.432 MHz

MCLKI Duty Ratio dMCLK 45 - 55 %

LRCLK Frequency fs 16 - 48 kHz

LRCLK Duty Ratio dLR 45 - 55 %

BCLK Frequency fBCK 0.512 - 3.072 MHz

BCLK Duty Ratio dBCK 45 - 55 % LRCLK edge to BCLK↑ Time tLRS 50 - - ns BCLK↑ to LRCLK Edge Time tSLR 50 - - ns

Data Hold Time tSDH 50 - - ns

Data Set-up Time tSDS 50 - - ns

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Technical Note

【BU7893GU】

･Whole Block

Unless otherwise specified, Ta=25℃, DVDD_CORE=1.8V, DVDD_IO=1.8V, AVDD=2.8V, Digital input terminal is fixed with DVDD_IO “L” or “H” level, The gain settings of the audio paths are all 0dB, and no signal

Parameter Symbol

DVDD_CORE Stand-by Current (Core logic block)

Min. Typ. Max.

ISTCO - - 10 µA standby,CLKI = DVSS

Limits

Unit Conditions

DVDD_IO Stand-by Current ISTIO - - 5 µA standby,CLKI = DVSS

AVDD Stand-by Current ISTA - - 5 µA standby

DVDD_CORE Operation Current IDDCO - 5 10 mA

DVDD_IO Operation Current IDDIO - 0.1 1 mA

AVDD Operation Current 1 (Analog melody)

AVDD Operation Current 2 (Digital melody)

IDDA1 - 1.6 2.8 mA

IDDA2 - 6.0 10.0 mA

BCLK,LRCLK = Input mode MCLK = L output

ANAINL→MIX1→SPOL ANAINR→MIX2→SPOR

SDI→MIX1→SPOL SDI→MIX2→SPOR TCXOI = 19.8MHz,fs = 44.1kHz

･DC Characteristic

Parameter Symbol Terminal

L Output Voltage

H Output Voltage

L Level Input Voltage1

L Level Input Voltage 2 CLKI

H Level Input Voltage 1

H Level Input Voltage 2 CLKI

L Level Input Current

H Level Input Current 1

H Level Input Current 2 CLKI

Output OFF Current

※1 : They also contain interactive terminals that are set output state. ※2 : They also contain interactive terminals that are set input state. ※3 : Please connect 100pF coupling capacitor and input 0.5V

(In address 15h CLKSEL1=0, CLKSEL0=1) ※4 : At interactive terminals of input state or three-state terminals of output-disable state

All output terminal

All input terminal

Hi-Z terminal

※

3

※

Vild2 -0.3

※

3

※

Vihd2

※

3

※

Iihd2 -1 1 µA

※

Vold 0 0.30 V Iol=+0.8mA

1

Vohd

1

Vild1 -0.3 DVSS+0.5 V

2

Vihd1

2

Iild -1 1 µA

2

Iihd1 -1 1 µA

2

Iozd -10 10 µA

4

DVDD_IO

-0.30

DVDD_IO

or more when you input through coupling capacitor.

P-P

Limits

Min. Max.

Unit Conditions

DVDD_IO V Ioh=-0.8mA

3

-0.5

3

※

DVDD_IO

+0.3

DVDD_CORE

+0.3

V

Input terminal voltage is DVSS

Input terminal voltage is DVDD_IO

Input terminal voltage is DVDD_CORE

・Audio Path(MIX)

Unless otherwise specified, Ta=25℃, AVDD=2.8V, reference input level=-6dBV, f=1kHz, A-weighted, path gain =0dB

Limits

Parameter Symbol

Unit Conditions

Min. Typ. Max.

ANAL_V Volume Setting G

ANAR_V Volume Setting G

-11 - +3 dB 1dB step

DACL

-11 - +3 dB 1dB step

DACR

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Technical Note

・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

Parameter Symbol

Min. Typ. Max.

Limits

Unit Conditions

THD+N THDSP - -70 -60 dB 20kHz LPF

Output Noise Voltage V

- -90 -80 dBV At no a signal

NOSP

Mute Level MLSP - -90 -80 dB 1kHz BPF

・Audio Path (HP amp)

Unless otherwise specified, Ta=25℃, AVDD=2.8V, reference input level =-6dBV, f=1kHz, A-weighted, path gain =0dB, RL=16Ω

Parameter Symbol

Min. Typ. Max.

Limits

Unit Conditions

THD+N THDHP - -65 -55 dB 20kHz LPF

Output Noise Voltage V

The Maximum Output Power P

- -90 -80 dBV At no signal

NOHP

10 - - mW THD=10%,16Ω load

OHP

Channel Separation CSHP - -80 -70 dB Vo=-14dBV,1kHz BPF

Mute Level MLHP - -90 -80 dB 1kHz BPF

HPL_V Volume Setting 1 GA1

HPL_V Volume Setting 2 GA2

HPR_V Volume Setting 1 GA1

HPR_V Volume Setting 2 GA2

-48 - 0 dB 2dB step

HPL

-42 - +6 dB 2dB step

HPL

-48 - 0 dB 2dB step

HPR

-42 - +6 dB 2dB step

HPR

・3D Surround, Equalizer, and Audio DAC

Unless otherwise specified, Ta=25℃, AVDD=2.8V, BCLK=64fs, LRCLK=256fs, f=1kHz, path gain=0dB, SPOL/SPOR output, SPOL/SPOR= no load, output=0dBFS

Parameter Symbol

Min. Typ. Max.

Full-scale Amplitude VMAX 1.40 1.68 2.00 V

S/N1 (A-Weighted) DAC

70 75 - dB

sn1

Limits

Unit Conditions

0.6×AVDD

P-P

THD+N1 (20kHz LPF) DACthd1 - -70 -60 dB fs=8,11.025kHz

THD+N2 (20kHz LPF) DACthd2 - -75 -65 dB fs=16,22.05,32,44.1,48kHz

・Audio I/F Format

Unless otherwise specified, Ta=25℃, DVDD_IO=1.62～3.3V, DVDD_CORE=1.62～1.98V

Parameter Symbol

Min. Typ. Max.

Limits

Unit Conditions

BCLK Output Frequency FBCKO 0.512 - 3.072 MHz 64fs

LRCLK Output Frequency FLRCKO 8 - 48 kHz

SDI Set-up Time tSDSU 100 - - nsec

SDI Hold Time tSDH 100 - - nsec

・PLL

Unless otherwise specified, Ta=25℃, AVDD=2.8V, BCLK = no load

Parameter Symbol

Min. Typ. Max.

Limits

Unit Conditions

PLL Lock-up Time Tlock1 - - 10 msec

PLL Jitter Tjitter1 - 200 - psec BCLK terminal,f

=65.536MHz

VCO

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●Reference Data 【BU7858KN】

10.0

A)

μ

8.0

6.0

4.0

2.0

STAND BY CURRENT : ICC (

0.0

2.0 2.5 3.0 3.5 4.0 4.5 SUPLLY VOLTAGE : VD D( V)

Fig.1 Stand-by Current

-30

-40

-50

-60

-70

-80

THD+N ( dB)

-90

-100

-110

-120

-110 - 90 -70 - 50 -30 - 10 IN PUT LEVEL : VIN (dB FS)

Fig.4 16bit D/A Converter Total

Harmonic Distortion (Lch)

-30

-40

-50

-60

-70

-80

THD+N (dB)

-90

-100

-110

-120 10 100 1000 10000 100000

INPUT SIGNAL Fr eq : F IN( Hz)

Fig.7 16

bit D/A Converter

Total Harmonic Distortion (Rch)

100.00

10.00

1.00

THD+N (%)

0.10

0.01

-100 - 80 - 60 -40 - 20 0 INPU T LEVEL : VIN(dBV)

Fig.10 SPO

Total Harmonic Distortion

14.0

12.0

10.0

8.0

6.0

4.0

2.0

CIRCUIT CURRENT : ICC (mA)

0.0

2.0 2.5 3.0 3.5 4.0 4.5 SUPLLY VOLTAGE : VD D( V)

Fig.2 16bit D/A Converter

Operation Current

-30

-40

-50

-60

-70

-80

THD+N (dB)

-90

-100

-110

-120

-110 - 90 -70 - 50 - 30 - 10 INPU T LEVEL : VIN( dBFS)

Fig.5 16bit D/A Converter

Total Harmonic Distortion (Rch)

100.00

10.00

1.00

THD+N (%)

0.10

0.01

-100 - 80 -60 -40 - 20 0 IN PUT LEVEL : VIN (dBV)

Fig.8 Headphone Amplifier

Total Harmonic Distortion (HP_L)

100.00

10.00

1.00

THD+N (%)

0.10

0.01

-100 - 80 -60 - 40 -20 0

INPUT LEVEL : VIN (dB V)

Fig.11 EXTO

Total Harmonic Distortion

Technical Note

6.0

5.0

4.0

3.0

2.0

1.0

CIRCUIT CURRENT : ICC (mA)

0.0

2.0 2.5 3.0 3.5 4.0 4.5 SUPLLY VOLTAGE : VD D( V)

Fig.3 Headphone Amplifier

Operation Current

-3 0

-4 0

-5 0

-6 0

-7 0

-8 0

THD+N (dB)

-9 0

-100

-110

-120

10 100 1000 10000 100000

INPUT SIGNAL Freq : FIN(Hz)

Fig.6 16bit D/A Converter

Total Harmonic Distortion (Lch)

100.00

10.00

1.00

THD+N (%)

0.10

0.01

-100 - 80 -60 -40 - 20 0 INPUT LEVEL : VIN (dB V)

Fig.9 Headphone Amplifier

Total Harmonic Distortion (HP_R)

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Technical Note

【BU7893GU】

5.0

4.5

A)

μ

4.0

3.5

3.0

2.5

2.0

1.5

1.0

STAND BY CURRENT : ICC (

0.5

0.0

1.6 1. 7 1.8 1.9 2.0

SUPLLY VOLTAGE : D VDD _COR E(V)

Fig.12 DVDD_CORE

Standby Current

5.0

4.5

A)

μ

4.0

3.5

3.0

2.5

2.0

1.5

1.0

STAND BY CURRENT : ICC (

0.5

0.0

2.6 2.8 3.0 3. 2 3.4 SUPLLY VOLT AGE : AVDD( V)

Fig.13 AVDD

Standby Current

5.0

4.5

A)

μ

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

CIRCUIT BY CURRENT : ICC (

0.0

1.6 1.7 1.8 1.9 2.0 SUPLLY VOLTAGE : DVDD_CORE(V)

Fig.14 DVDD_CORE

Operation Current (Analog melody)

2.0

1.9

1.8

1.7

1.6

1.5

CIRCUIT CURRENT : ICC (mA)

1.4

2.6 2. 8 3.0 3.2 3.4

SUPLLY VOLTAGE : AVDD (V)

Fig.15 AVDD

Operation Current (Analog melody)

5.0

4.5

4.0

3.5

3.0

2.5

CIRCUIT CURRENT : ICC (mA)

2.0

1.6 1.7 1.8 1.9 2.0

SUPLLY VOLT AGE : DVDD _CORE( V)

Fig.16 DVDD_CORE

Operation Current (digital melody)

4.0

3.9

3.8

3.7

3.6

3.5

3.4

3.3

3.2

CIRCUIT CURRENT : ICC (mA)

3.1

3.0

2.6 2. 8 3.0 3.2 3.4

SUPLLY VOLT AGE : AVDD( V)

Fig.17 AVDD

Operation Current (digital melody)

0.0

-10. 0

-20. 0

-30. 0

(dB)

-40. 0

-50. 0

THD+N

-60. 0

-70. 0

-80. 0

-90. 0

-100 - 80 -60 - 40 -20 0

INPU T LEVEL (dBF S)

Fig.18 16bit D/A Converter

Total Harmonic Distortion 1kHz (SPOL)

0.0

-10. 0

-20. 0

-30. 0

(dB)

-40. 0

-50. 0

THD+N

-60. 0

-70. 0

-80. 0

-90. 0 10 100 1000 10000 100000

INPUT SIGNAL FREQUENCY (Hz)

Fig.21 16bit D/A Converter

Total Harmonic Distortion (SPOR)

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0.0

-10.0

-20.0

-30.0

(dB)

-40.0

-50.0

THD+N

-60.0

-70.0

-80.0

-90.0

-100 - 80 - 60 -40 -20 0

INPU T LEVEL (dBFS)

ig.19 16bit D/A Converter

F

Total Harmonic Distortion 1kHz (SPOR)

100.00

10.00

(%)

1.00

THD+N

0.10

0.01

-100. 0 -80. 0 - 60.0 - 40.0 - 20.0 0.0 INPU T LEVEL (dBV)

Fig.22 Headphone Amplifier

Total Harmonic Distortion (HPOL / HPOR)

0.0

-10. 0

-20. 0

-30. 0

(dB)

-40. 0

-50. 0

THD+N

-60. 0

-70. 0

-80. 0

-90. 0 10 100 1000 10000 100000

INPU T SIGNA L FR EQU ENC Y (Hz )

Fig.20 16bit D/A Converter

Total Harmonic Distortion (SPOL)

100.0

10.0

(%)

1.0

THD+N

0.1

0.0

-100 - 80 -60 - 40 - 20 0

INPU T LEVEL (dBV)

Fig.23 Speaker Preamp

Total Harmonic Distortion (SPOL / SPOR)

2010.09 - Rev.

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BU7858KN,BU7893GU

●Block diagram and pin assignment 【BU7858KN】

PLLC

MCLKO

PLL

RXI

RING

BCLK

MCLKI

BCLK

LRCLK

SDTI

MEL_R

MEL_L

EXTI

Digital

Audio

I/F

MEL_L

22

MEL_R

23

RING

24

RXI

25

PLLC

26

MCLKO

27

MCLKI

28

AVSSAVDDDVSSDVDD

MIX-

SEL1

SW1

+

ATT1

Digit

al

ATT

CVCOM

SW2

BIAS

16bit DAC

LPF

ATT

NRST

Serial Control

SCLK

SDATA SCS

MIX-

SEL2

MIXSEL3

MIXSEL4

Fig.24 BU7858KN Block Diagram

21

EXTI

1

SDTI

SPO

20

2

LRCLK

19

EXTO

3

BCLK

AVDD

18

4

AVSS

HP_L

16

17

5

6

SCLK

DVSS

DVDD

Fig.25 BU7858KN Pin Assignment (TOP VIEW)

15

CA_L

7

ATT2

ATT3

ATT4

ATT5

SDATA

CSTEP

14

13

12

11

10

9

8

CSTART

CA_R

HP_R

CVCOM

CSTART

CSTEP

NRST

NCS

Technical Note

+

-

+

-

600Ω

16Ω

SPO

EXTO

HP_R

CA_R

HP_L

CA_L

SP Amp

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