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 single-
chip IC contains all the analog audio components needed for notebook computers.
Product
BA7786FP-Y
BA7787FS
H.P.amp
Stereo
Stereo
S.P.amp
Stereo
Monaural
Other functions
SYSTEM / PM BEEP input, SUSPEND, EVR, MUTE,
BEEP level control
•
Applications
Notebook computers
•
Featuresheadphone amplifier that supports mixing
1) Stereo
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 amplifi-
er and speaker amplifier, for low-power-consumption
computers .
5) Two beep input pins, a necessity for notebook com-
puters.
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power
dissipation
BA7786FP-Y
BA7787FS
Symbol
V
CC
Pd
Topr
Tstg
Limits
6
850
∗
1
600
∗
2
– 10 ~ + 70
– 55 ~ + 125
Unit
V
mW
°C
°C
Operating temperature
Storage temperature
∗
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.
•
Recommended operating conditions (Ta = 25°C)
Parameter
Power supply voltage
Symbol
V
CC
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
1
Multimedia ICs
BA7786FP-Y / BA7787FS
•
Block diagram
BA7786FP-Y
HP OUT R
HP OUT L
HP GND
SP IN R
SP IN L
HP V
CC
SP V
CC
LINE MIX ON / OFF
SP OUT1 R
SP OUT2 R
MONO / ST
25
24
23
22
21
20
19
18
17
16
15
14
HP V
CC
SP V
CC
HP SUSPEND
1
2
3
4
5
6
7
8
9
10
11
12
13
LINE IN L
MUTE CTRL
LINE IN R
SYSTEM BEEP IN
SP OUT1 L
PM BEEP IN
SP OUT2 L
EVR CTRL
LCH OUT
HP SUSPEND
•
Pin descriptions
BA7786FP-Y
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Pin name
EVR CTRL
LINE IN L
MUTE CTRL
LINE IN R
BIAS
SYSTEM BEEP IN
BEEP LEVEL
LCH OUT
PM BEEP IN
SP OUT1 L
SP OUT2 L
HP SUSPEND
SP SUSPEND
SP GND
MONO / ST
SP OUT2 R
SP OUT1 R
LINE MIX ON / OFF
SP V
CC
SP IN R
SP IN L
HP GND
HP OUT R
HP OUT L
HP V
CC
EVR control pin
Line Lch input
Headphone mute control pin
Line Rch input
Bias
SYSTEM BEEP input
SYSTEM BEEP IN output level setting
LINE IN L + SYSTEM BEEP IN output
PM beep input
BTL speaker Lch output (forward)
BTL speaker Lch output (reverse)
Headphone SUSPEND control
Speaker SUSPEND control
Speaker ground
Speaker amplifier Lch ON / OFF control
BTL speaker Rch output (reverse)
BTL speaker Rch output (forward)
SP IN L / R input ON / OFF control
Speaker Vcc
Speaker Rch input
Speaker Lch input
Headphone ground
Headphone Rch output
Headphone Lch output
Headphone Vcc
Function
Voltage
—
2.5
5.0
2.5
2.5
2.5
4.2
—
2.5
2.5
2.5
5.0
5.0
0.0
5.0
2.5
2.5
5.0
5.0
2.5
2.5
0.0
2.5
2.5
5.0
Type
B (NPN)
B (PNP)
100kΩ PULL UP
B (PNP)
23.5kΩ
B (NPN)
C (PNP) ~ 3kΩ
C (PNP)
B (NPN)
EF (NPN)
EF (NPN)
100kΩ PULL UP
100kΩ PULL UP
—
100kΩ PULL UP
EF (NPN)
EF (NPN)
100kΩ PULL UP
—
B (NPN)
B (NPN)
—
EF (NPN)
EF (NPN)
—
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 V
CC
= + 5.0V) in Fig. 1, entitled "Measurement circuit diagram,"
and do not guarantee standards.
2
SP SUSPEND
BEEP LEVEL
BIAS
SP SUSPEND
VR
VR
SP GND
Multimedia ICs
BA7786FP-Y / BA7787FS
•
Block diagram
BA7787FS
BEEP LEVEL
HP OUT R
HP OUT L
SP OUT1
SP OUT2
HP GND
HP V
CC
SP V
CC
LINE MIX ON / OFF
SP GND
11
10
SP SUSPEND
20
19
18
17
16
15
14
13
12
HP V
CC
SP V
CC
HP SUSPEND
1
EVR CTRL
2
LINE IN L
3
MUTE CTRL
4
LINE IN R
5
BIAS
6
SYSTEM BEEP IN
7
SP IN
8
PM BEEP IN
9
HP SUSPEND
BA7787FS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin name
EVR CTRL
LINE IN L
MUTE CTRL
LINE IN R
BIAS
SYSTEM BEEP IN
SP IN
PM BEEP IN
HP SUSPEND
SP SUSPEND
SP GND
LINE MIX ON / OFF
SP OUT2
SP OUT1
BEEP LEVEL
SP V
CC
HP GND
HP OUT R
HP OUT L
HP V
CC
EVR control pin
Line Lch input
Headphone mute control
Line Rch input
Bias
SYSTEM BEEP input
Speaker input
PM BEEP input
Headphone SUSPEND control
Speaker SUSPEND control
Speaker ground
SP IN input ON / OFF control
BTL speaker output (reverse)
BTL speaker output (forward)
SYSTEM BEEP IN output level setting
Speaker Vcc
Headphone ground
Headphone Rch output
Headphone Lch output
Headphone Vcc
Function
Pin voltage
—
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
Pin type
B (NPN)
B (PNP)
100kΩ PULL UP
B (PNP)
23.5kΩ
B (NPN)
B (NPN)
B (NPN)
B (PNP)
B (PNP)
—
100kΩ PULL UP
EF (NPN)
EF (NPN)
C (PNP) ~ 3kΩ
—
—
EF (NPN)
EF (NPN)
—
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 V
CC
= + 5.0V) in Fig. 2, entitled "Measurement circuit diagram,"
and do not guarantee standards.
SP SUSPEND
VR
VR
3
Multimedia ICs
BA7786FP-Y / BA7787FS
•
Control pin circuits
BA7786FP-Y
MUTE CTRL (3pin)
MONO / ST (15pin)
HP V
CC
HP SUSPEND (12pin)
SP SUSPEND (12pin)
HP V
CC
LINE MIX ON / OFF (18pin)
HP V
CC
100k
100k
18pin
20k
12,13pin
100k
10k
3,15pin
10k
BA7787FS
MUTE CTRL (3pin)
HP V
CC
HP SUSPEND (9pin)
SP SUSPEND (10pin)
HP V
CC
LINE MIX ON / OFF (12pin)
HP V
CC
100k
100k
10k
3pin
9,10pin
12pin
20k
10k
Note) All figures are design values, and do not represent guaranteed performance.
4
Multimedia ICs
BA7786FP-Y / BA7787FS
CC
•
Electrical characteristics (unless otherwise noted, Ta = 25°C, HP V
BA7786FP-Y
Parameter
〈Supply
current〉
Supply current
Supply current SUSPEND
I
CC
I
CCS
3.52
175
4.82
240
7.64
410
mA
µA
Symbol
Min.
Typ.
Max.
Unit
= SP V
CC
= 5.0V, f = 1kHz)
Conditions
Measurement circuit
No input, SP OUT = no load
No input, V
H
= V
S
= H
Fig.1
Fig.1
〈HP
AMP 1〉 INPUT: LINE IN L / R, OUTPUT: HP OUT L / R
Output voltage level
Distortion
EVR variation range
Maximum output level
Output residual noise
Interchannel crosstalk
Muting level
V
OHP
THD
HP
G
EVR
V
OMHP
V
ONHP
CT
HP
MT
HP
– 7.4
—
70
– 1.6
—
—
—
– 4.0
0.1
90
+ 0.6
– 80
– 79
– 94
– 1.5
1.0
—
—
– 73
– 70
– 83
dBV
%
dB
dBV
dBV
dBV
dBV
V
IN
= – 10.0dBV
V
IN
= – 10.0dBV
∗
1
V
IN
= – 10.0dBV
∗
2
V
E
= HP V
CC
→V
E
= ground level differential
THD = 1%
∗
1
R
g
= 1kΩ
∗
2
V
IN
= – 7.0dBV
∗
2
V
IN
= – 7.0dBV
∗
2
, V
M
= L
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
〈HP
AMP 2〉 INPUT: SYSTEM BEEP IN, OUTPUT: HP OUT L / R
Output voltage level
Input threshold level
V
OHB
V
HBH
0.22
4.5
0.32
—
0.42
5.0
V
P-P
V
P-P
V
IN
= 5.0V
P-P
Fig.1
Fig.1
〈SP
AMP 1〉 INPUT: SP IN L / R, OUTPUT: SP OUT L / R
Output voltage level
Distortion
Maximum output level
Output residual noise
Interchannel crosstalk
LINE MIX OFF level
V
OSP
THD
SP
V
OMSP
V
ONSP
CT
SP
V
OOFFSP
– 1.4
—
+ 3.5
—
—
—
+ 2.0
0.4
+ 5.7
– 90
– 78
– 78
+ 4.5
1.5
—
– 80
– 70
– 70
dBV
%
dBV
dBV
dBV
dBV
V
IN
= – 10.0dBV
V
IN
= – 10.0dBV
∗
1
THD = 1%
∗
1
R
g
= 1kΩ
∗
2
V
IN
= – 12.0dBV
∗
2
V
IN
= –
12.0dBV
∗
2
,
V
L
= L
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
〈SP
AMP 2〉 INPUT: PM BEEP IN, OUTPUT: SP OUT L / R
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
V
LL
V
LH
GND
4.3
—
—
0.4
V
CC
V
V
Fig.1
Fig.1
V
NL
V
NH
GND
4.3
—
—
0.4
V
CC
V
V
Fig.1
Fig.1
V
SL
V
SH
GND
4.3
—
—
0.4
V
CC
V
V
Fig.1
Fig.1
V
HL
V
HH
GND
4.3
—
—
0.4
V
CC
V
V
Fig.1
Fig.1
V
ML
V
MH
GND
4.3
—
—
0.4
V
CC
V
V
Fig.1
Fig.1
V
OSB
– 7.4
– 4.0
– 1.5
dBV
V
IN
= – 10.0dBV
Fig.1
∗
1
: B.W. = 0.4 ~ 30kHz
∗
2
: DIN audio mode settings are as follows, unless otherwise noted:
V
E
= HP V
CC
(EVR = Max.), V
M
= H (HP MUTE OFF), V
H
= L (HP SUSPEND), V
S
= L (SP SUSPEND), V
L
= H (LINE MIX ON), V
N
= H (STEREO)
5
京公网安备 11010802033920号
EEWORLD
