ROHM BA7786FP-Y Datasheet

1

Multimedia ICs

Headphone / speaker amplifier for
notebook computers

BA7786FP-Y / BA7787FS

The BA7786FP-Y and BA7787FS are sound amplifiers designed for notebook computers, and contain a suspend
function and input pins for the system beep and PM beep sounds used by notebook computers. In short, this single­chip IC contains all the analog audio components needed for notebook computers.

•

Applications

Notebook computers

•

Features

1) Stereo headphone amplifier that supports mixing
input, along with a stereo speaker amplifier
(BA7786FP-Y) or BTL monaural speaker amplifier
(BA7787FS).

2) Internal anti-pop circuit, to prevent the popping sounds
that occur when the power is turned on and off.

3) Internal electronic volume switch and mute circuit.

4) Separate suspend modes for the headphone amplifi­er and speaker amplifier, for low-power-consumption
computers .

5) Two beep input pins, a necessity for notebook com­puters.

•

Absolute maximum ratings (Ta = 25°C)

•

Recommended operating conditions (Ta = 25°C)

Parameter

Symbol Limits Unit

Power supply voltage

V

CC

V

6

Power
dissipation

mW

850

∗

1

Pd

600

∗

2

Operating temperature

Topr
Tstg

°C
°C

– 10 ~ + 70

Storage temperature

– 55 ~ + 125

BA7786FP-Y
BA7787FS

∗

1 Reduced by 6.8mW for each increase in Ta of 1°C over 25°C.

∗

2 Reduced by 6.0mW for each increase in Ta of 1°C over 25°C.

Parameter

Symbol Typ. Unit

Power supply voltage

V

CC

V

Min.

Max.

4.5

5.0

5.5

Product

S.P.amp

Other functions
BA7786FP-Y
BA7787FS

H.P.amp

Stereo
Stereo

Stereo

Monaural

SYSTEM / PM BEEP input, SUSPEND, EVR, MUTE,
BEEP level control

2

Multimedia ICs BA7786FP-Y / BA7787FS

•

Block diagram

HP SUSPEND

SP SUSPEND

HP V

CC

SP V

CC

HP V

CC

HP OUT R

HP GND

SP IN L

SP IN R

HP OUT L

SP VCCLINE MIX ON / OFF

SP OUT1 R

SP OUT2 R

MONO / ST

SP GND

EVR CTRL

LINE IN L

MUTE CTRL

LINE IN R

BIAS

SYSTEM BEEP IN

LCH OUT

BEEP LEVEL

PM BEEP IN

SP OUT1 L

SP OUT2 L

HP SUSPEND

SP SUSPEND

1 2 3 4 5 6 7 8 9 10111213

141516171819

202122232425

VR VR

BA7786FP-Y

•

Pin descriptions

Pin No.

Pin name

Function
1
2
3
4
5
6
7
8
9

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

EVR CTRL

EVR control pin

25

Voltage

Type

— B (NPN)

LINE IN L

Line Lch input

2.5 B (PNP)

MUTE CTRL

Headphone mute control pin

5.0 100kΩ PULL UP

LINE IN R

Line Rch input

2.5 B (PNP)

BIAS

Bias

2.5 23.5kΩ

SYSTEM BEEP IN

SYSTEM BEEP input

2.5

B (NPN)

BEEP LEVEL

SYSTEM BEEP IN output level setting

4.2 C (PNP) ~ 3kΩ

LCH OUT

LINE IN L + SYSTEM BEEP IN output

— C (PNP)

PM BEEP IN

PM beep input

2.5 B (NPN)

SP OUT1 L

BTL speaker Lch output (forward)

2.5 EF (NPN)

SP OUT2 L

BTL speaker Lch output (reverse)

2.5 EF (NPN)

HP SUSPEND

Headphone SUSPEND control

5.0 100kΩ PULL UP

SP SUSPEND

Speaker SUSPEND control

5.0 100kΩ PULL UP

SP GND

Speaker ground

0.0 —

MONO / ST

Speaker amplifier Lch ON / OFF control

5.0 100kΩ PULL UP

SP OUT2 R

BTL speaker Rch output (reverse)

EF (NPN)

SP OUT1 R

BTL speaker Rch output (forward)

2.5 EF (NPN)

LINE MIX ON / OFF

SP IN L / R input ON / OFF control

5.0 100kΩ PULL UP

SP V

CC

Speaker Vcc

5.0 —

SP IN R

Speaker Rch input

2.5 B (NPN)

SP IN L

Speaker Lch input

2.5 B (NPN)

HP GND

Headphone ground

0.0 —

HP OUT R

Headphone Rch output

2.5 EF (NPN)

HP OUT L

Headphone Lch output

2.5

EF (NPN)

HP V

CC

Headphone Vcc

5.0 —

2.5

Note) The pin formats are as follows. EF: emitter follower; B: base; C: collector; ~ : series connection.

The above values are all based on the settings (HP V

CC = SP VCC = + 5.0V) in Fig. 1, entitled "Measurement circuit diagram,"

and do not guarantee standards.

BA7786FP-Y

3

Multimedia ICs BA7786FP-Y / BA7787FS

•

Block diagram

20 19 18 17 16 15 11

1 2 3 4 5 6 9 10

HP VCC

HP VCC

HP OUT R

HP GND

SP VCCBEEP LEVEL

HP OUT L

SP GND

EVR CTRL

LINE IN L

MUTE CTRL

LINE IN R

BIAS

SYSTEM BEEP IN

SP SUSPEND

HP SUSPEND

14

SP OUT113SP OUT212LINE MIX ON / OFF

7

SP IN

8

PM BEEP IN

SP VCC

HP SUSPEND

SP SUSPEND

VR VR

BA7787FS

1

EVR CTRL

EVR control pin

2

LINE IN L

Line Lch input

B (PNP)

B (PNP)

23.5kΩ
B (NPN)
B (NPN)
B (NPN)

B (PNP)
B (PNP)

EF (NPN)

EF (NPN)

EF (NPN)

—

—

EF (NPN)

—

B (NPN)

3

MUTE CTRL

Headphone mute control

100kΩ PULL UP

4

LINE IN R

Line Rch input

5

BIAS

Bias

6

SYSTEM BEEP IN

SYSTEM BEEP input

7

SP IN

Speaker input

8

PM BEEP IN

PM BEEP input

9

HP SUSPEND

Headphone SUSPEND control

10

SP SUSPEND

Speaker SUSPEND control

11

SP GND

Speaker ground

12

LINE MIX ON / OFF

SP IN input ON / OFF control

100kΩ PULL UP

C (PNP) ~ 3kΩ

13

SP OUT2

BTL speaker output (reverse)

14

SP OUT1

BTL speaker output (forward)

15

BEEP LEVEL

16

SP V

CC

Speaker Vcc

17

HP GND

Headphone ground

18

HP OUT R

Headphone Rch output

19

HP OUT L

Headphone Lch output

20

HP V

CC

Headphone Vcc

—

SYSTEM BEEP IN output level setting

Pin No. Pin name Function Pin voltage Pin type

—

2.5

5.0

2.5

2.5

2.5

2.5

2.5
—
—

0.0

5.0

2.5

2.5

4.2

5.0

0.0

2.5

2.5

5.0

Note) The pin formats are as follows. EF: emitter follower, B: base, C: collector, ~ : series connection.

The above values are all based on the settings (HP V

CC = SP VCC = + 5.0V) in Fig. 2, entitled "Measurement circuit diagram,"

and do not guarantee standards.

BA7787FS

4

Multimedia ICs BA7786FP-Y / BA7787FS

•

Control pin circuits

100k

3,15pin

10k

HP V

CC

BA7786FP-Y

MUTE CTRL (3pin)
MONO / ST (15pin)

100k

12,13pin

10k

HP V

CC

HP SUSPEND (12pin)
SP SUSPEND (12pin)

20k

100k

18pin

HP VCC

LINE MIX ON / OFF (18pin)

100k

3pin

10k

HP V

CC

BA7787FS

MUTE CTRL (3pin)

Note) All figures are design values, and do not represent guaranteed performance.

10k

9,10pin

HP V

CC

HP SUSPEND (9pin)
SP SUSPEND (10pin)

20k

100k

12pin

HP VCC

LINE MIX ON / OFF (12pin)

5

Multimedia ICs BA7786FP-Y / BA7787FS

Parameter Symbol Unit ConditionsMin. Typ. Max.

〈Supply current〉
Supply current
Supply current SUSPEND

Output voltage level

Maximum output level
Output residual noise
Interchannel crosstalk
Muting level

Output voltage level
Input threshold level

Output voltage level
Distortion
Maximum output level
Output residual noise
Interchannel crosstalk
LINE MIX OFF level

Output level

〈MUTE CTRL〉 (pin 13)
HP MUTE ON holding voltage
HP MUTE OFF holding voltage
〈HP SUSPEND〉 (pin 12)

HP SUSPEND holding voltage

HP SUSPEND holding voltage

〈SP SUSPEND〉 (pin 13)
HP SUSPEND holding voltage
HP SUSPEND holding voltage
〈MONO / STEREO〉 (pin 15)
MONAURAL holding voltage
STEREO holding voltage
〈LINE MIX ON / OFF〉 (pin 18)
LINE MIX OFF holding voltage
LINE MIX ON holding voltage

EVR variation range

Distortion

Measurement circuit

3.52 4.82 7.64

No input, SP OUT = no load

Fig.1

I

CC

mA

175 240 410

No input, V

H = VS = H

Fig.1

I

CCS

µA

〈HP AMP 1〉 INPUT: LINE IN L / R, OUTPUT: HP OUT L / R

〈HP AMP 2〉 INPUT: SYSTEM BEEP IN, OUTPUT: HP OUT L / R

〈SP AMP 2〉 INPUT: PM BEEP IN, OUTPUT: SP OUT L / R

– 7.4 – 4.0 – 1.5

V

IN = – 10.0dBV

V

IN = – 10.0dBV

∗

1

VIN = – 10.0dBV

∗

2

VE = HP VCC→VE = ground level differential

Fig.1

V

OHP

dBV

— 0.1 1.0

Fig.1

THD

HP

%

– 1.6 + 0.6 —

THD = 1%

∗

1

Fig.1

V

OMHP

dBV
dBV
dBV
dBV

V

P-P

VP-P

dBV

70 90 —

Fig.1

G

EVR

dB

— – 80 – 73

R

g = 1kΩ

∗

2

VIN = – 7.0dBV

∗

2

VIN = – 7.0dBV

∗

2

, VM = L

V

IN = – 10.0dBV

V

IN = – 10.0dBV

∗

1

VIN = – 12.0dBV

∗

2

VIN = – 12.0dBV

∗

2

, VL = L

V

IN = – 10.0dBV

Fig.1

V

ONHP

— – 79 – 70

Fig.1

CT

HP

— – 94 – 83

Fig.1

MT

HP

0.22 0.32 0.42

V

IN = 5.0VP-P

Fig.1

4.5 — 5.0

Fig.1

V

HBH

VOSP

THDSP

VOHB

– 1.4 + 2.0 + 4.5

Fig.1

— 0.4 1.5

Fig.1

%

+ 3.5 + 5.7 —

THD = 1%

∗

1

Fig.1

V

OMSP

dBV

— – 90 – 80

R

g = 1kΩ

∗

2

Fig.1

V

ONSP

dBV
dBV
dBV

dBV

— – 78 – 70

Fig.1

CT

SP

— – 78

– 70

Fig.1

V

OOFFSP

– 7.4 – 4.0 – 1.5

Fig.1

Fig.1
Fig.1

VOSB

GND — 0.4VML V

4.3 — V

CCVMH V

GND — 0.4

Fig.1

V

HL V

4.3 — V

CC

Fig.1

V

HH V

4.3 — V

CC

Fig.1

V

SH V

GND — 0.4

Fig.1

V

SL V

4.3 — V

CC

Fig.1

V

NH V

GND — 0.4

Fig.1

V

NL

V

GND — 0.4

Fig.1

V

LL V

4.3 — V

CC

Fig.1

V

LH V

〈SP AMP 1〉 INPUT: SP IN L / R, OUTPUT: SP OUT L / R

∗

1: B.W. = 0.4 ~ 30kHz

∗

2: DIN audio mode settings are as follows, unless otherwise noted:

V

E = HP VCC (EVR = Max.), VM = H (HP MUTE OFF), VH = L (HP SUSPEND), VS = L (SP SUSPEND), VL = H (LINE MIX ON), VN = H (STEREO)

BA7786FP-Y

•

Electrical characteristics (unless otherwise noted, Ta = 25°C, HP VCC = SP VCC = 5.0V, f = 1kHz)

6

Multimedia ICs BA7786FP-Y / BA7787FS

Parameter Symbol Unit ConditionsMin. Typ. Max.

〈Supply current〉
Supply current
Supply current SUSPEND

Output voltage level

Maximum output level
Output residual noise
Interchannel crosstalk
Muting level

Output voltage level
Input threshold level

Output voltage level
Distortion
Maximum output level
Output residual noise
Interchannel crosstalk
LINE MIX OFF level

Output level

〈MUTE CTRL〉 (pin 3)
HP MUTE ON holding voltage
HP MUTE OFF holding voltage
〈HP SUSPEND〉 (pin 9)

HP SUSPEND holding voltage

HP SUSPEND holding voltage

〈SP SUSPEND〉 (pin 10)
SP SUSPEND holding voltage
SP SUSPEND holding voltage
〈LINE MIX ON / OFF〉 (pin 12)
LINE MIX OFF holding voltage
LINE MIX ON holding voltage

EVR variation range

Distortion

Measurement circuit

3.10 4.25 6.74

No input, SP OUT = no load

Fig.2

I

CC

mA

175 240 410

No input, V

H = VS = H

Fig.2

I

CCS

µA

〈HP AMP 1〉 INPUT: LINE IN L / R, OUTPUT: HP OUT L / R

〈HP AMP 2〉 INPUT: SYSTEM BEEP IN, OUTPUT: HP OUT L / R

〈SP AMP 2〉 INPUT: PM BEEP IN, OUTPUT: SP OUT L / R

– 7.4 – 4.0 – 1.5

V

IN = – 10.0dBV

V

IN = – 10.0dBV

∗

1

VIN = – 10.0dBV

∗

2

VE = HP VCC→VE = ground level differential

Fig.2

V

OHP

dBV

— 0.1 1.0

Fig.2

THD

HP

%

– 1.6 + 0.6 —

THD = 1%

∗

1

Fig.2

V

OMHP

dBV
dBV
dBV
dBV

V

P-P

VP-P

dBV

70 90 —

Fig.2

G

EVR

dB

— – 80 – 73

R

g = 1kΩ

∗

2

VIN = – 7.0dBV

∗

2

VIN = – 7.0dBV

∗

2

, VM = L

V

IN = – 10.0dBV

V

IN = – 10.0dBV

∗

1

VIN = – 12.0dBV

∗

2

VIN = – 12.0dBV

∗

2

, VL = L

V

IN = – 10.0dBV

Fig.2

V

ONHP

— – 79 – 70

Fig.2

CT

HP

— – 94 – 83

Fig.2

MT

HP

0.22 0.32 0.42

V

IN = 5.0VP-P

Fig.2

4.5 — 5.0

Fig.2

V

HBH

VOSP

THDSP

VOHB

– 1.4 + 2.0 + 4.5

Fig.2

— 0.4 1.5

Fig.2

%

+ 3.5 + 5.7 —

THD = 1%

∗

1

Fig.2

V

OMSP

dBV

— – 90 – 80

R

g = 1kΩ

∗

2

Fig.2

V

ONSP

dBV
dBV
dBV

dBV

— – 78 – 70

Fig.2

CT

SP

— – 78

– 70

Fig.2

V

OOFFSP

– 7.4 – 4.0 – 1.5

Fig.2

Fig.2
Fig.2

VOSB

GND — 0.4VML V

4.3 — V

CCVMH V

GND — 0.4

Fig.2

V

HL V

4.3 — V

CC

Fig.2

V

HH V

4.3 — V

CC

Fig.2

V

SH V

GND — 0.4

Fig.2

V

SL V

GND — 0.4

Fig.2

V

LL V

4.3 —

—
—

—
—

—

—

—
—V

CC

Fig.2

V

LH V

〈SP AMP 1〉 INPUT: SP IN L / R, OUTPUT: SP OUT L / R

∗

1: B.W. = 0.4 ~ 30kHz

∗

2: DIN audio mode settings are as follows, unless otherwise noted:

V

E = HP VCC (EVR = Max.), VM = H (HP MUTE OFF), VH = L (HP SUSPEND), VS = L (SP SUSPEND), VL = H (LINE MIX ON),

V

N = H (STEREO)

BA7787FS

〈Control threshold voltage〉

7

Multimedia ICs BA7786FP-Y / BA7787FS

1

25

24 23 21 20

19

18 17

16

15 14

2

3

456

8

7

9

10 11 12 13

22

VR

HP SUSPEND

27k

27k

27k

18k

8

33k

390k

0.47µ

47µ

47µ

100

100

8

1k

15k

15k

1k

0.47µ

0.47µ

0.47µ

0.47µ

0.47µ

22µ

1µ

1k

1k

1k

1k

SP SUSPEND

VR

BA7786FP-Y

HP VCC

SP VCC

HP OUT R

HP GND

SP IN L

SP IN R

HP OUT L

SP OUT R

SP GND

LINE IN L

LINE IN R

SYSTEM BEEP IN

LCH OUT

PM BEEP IN

SP OUT L

HP VCC

SP VCC

VL

VE

VM

VH

VS

VN

Fig. 1

+ +

+

+

+

+

•

Measurement circuit

8

Multimedia ICs BA7786FP-Y / BA7787FS

1

20

19 18

16

15

14

13 12

11

2

3456 8

7

9

10

17

VR

HP SUSPEND

V

E

VL

27k

27k

33k

0.47µ

47µ

47µ

100

100

8

390k

0.47µ

0.47µ

22µ

1k

1k

1k

V

M

VH

VS

SP SUSPEND

15k

0.47µ

1k

18k

0.47µ

1k

VR

BA7787FS

HP VCC

HP VCC

HP OUT R

HP GND

SP V

CC

HP OUT L

SP GND

LINE IN L

LINE IN R

SYSTEM BEEP IN

SP OUT

SP IN

PM BEEP IN

SP VCC

Fig. 2

+ +

+

+

+