ROHM BU7843AGU Technical data

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Structure Silicon Monolithic Integrated Circuit

Product Name Audio Interface for Cellular Phone

Product No. BU7843AGU

Features Audio Interface

6x6 keyscan circuit

o

○Absolute Maximum Ratings(Ta=25

Parameter Symbol Rating Unit Remarks
Analog supply voltage AVD D
Digital supply voltage DVDD
Power supply voltage PVDD

Analog input voltage V

Digital input voltage V

Input current IIN

Allowable dissipation Pd 310(*1) mW

Operating temperature range T

Storage temperature range T

(*1) When Ta is above 25oC, reduce 3.1mW per 1oC.

○Recommended operating conditions（Ta =2 5

Parameter Symbol

Analog operation voltage AVDD 2.7 2.8 3.1 V (*2)

Digital operation voltage DVDD 1.65 1.8 3.1

Power operation voltage PVDD 2.7 2.8 3.1

(*2) AVDD and PVDD are internally connected in the IC and use the same potential.

This chip is not designed to protect itself against radioactive rays.

C）

AIN

DIN

OPR

STG

-0.3～4.5

-0.3～4.5

-0.3～4.5

AVSS-0.3～AVDD+0.3

DVSS-0.3～DVDD+0.3

-10～+10

o

-30～+85

-55～+125

C）

Rating

Min. Typ. Max.

V
V
V

V

V

mA

o

C

o

C

Unit Remarks

V

V

REV. B

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○Electrical Characteristics

(Unless otherwise noted, Ta = 25oC AVSS=DVSS=PVSS=0.0V ATT is set at 0)

Parameter Symbol

Min. Typ. Max.

Digital DC characteristics

Digital high level input
voltage 1

Digital high level input
voltage 2

Digital low level input voltage
1

Digital low level input voltage
2

V

IH1

V

IH2

V

V

Digital high level input current IIH

Digital low level input current IIL

Digital high level output
voltage

Digital low level output
voltage

VOH

V

IL1

IL2

OL

0.8

DVDD

DVDD

-0.4

- - 0.2

- - 0.4 V

- - 1

- - 1

DVDD

-0.5

- - 0.5 V

Digital AC characteristics
SCL clock frequency f

Bus free time t

(Iterative) start condition

setup time

(Iterative) start condition hold

time

SCL low time t

SCL high time t

Data setup time t

Data hold time t

Stop condition setup time t

- - 400 kHz

SCL

1.3 - - μs

BUF

t

0.6 - - μs

SU;STA

t

0.6 - - μs

HD;STA

1.3 - - μs

LOW

0.6 - - μs

HIGH

100 - - ns

SU;DAT

0 - - ns

HD;DAT

0.6 - - μs

SU;STO

Current consumption AVDD=DVDD=PVDD=2.8V input signal = no signal.
Standby current IST - - 3 μA

TX_OUT path current I

HF_OUT path current I

BT_OUT path current I

Reciever path current I

Headphone path current I

Speaker path current I

Full operation current I

Microphone bias current I

- 1.3 2.2 mA

DD1

- 1.4 2.4 mA

DD2

- 1.3 2.2 mA

DD3

- 2.5 4.2 mA

DD4

- 3.5 5.9 mA

DD5

- 1.9 3.2 mA

DD6

- 8.5 13.5 mA

DD9

- 250 430 μA

DD8

Rating

- - V

- - V

DVDD

- - V

Unit Condition

DVDD=3.0V

DVDD=1.8V

DVDD=3.0V

V

DVDD=1.8V

VIH=DVDD

μA

VIL=DVSS

μA

IOH=-1mA

IOL=1mA

After a reset

MIC1_IN→MIX6→TX_OUT

RX_IN→MIX2→HF_OUT

RX_IN→MIX2→BT_OUT

RX_IN→MIX2→RCVP_OUT､

RCVN_OUT

DACL_IN→MIX2→HPL_OUT

DACR_IN→MIX3→HPR_OUT

DACL_IN→MIX4→SPL_OUT

DACR_IN→MIX5→SPR_OUT

All paths are ON

BIAS_ON＝！

REV. B