ROHM BA7786FP-Y

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.
H.P.amp
S.P.amp
BA7786FP-Y
Stereo
Stereo
BA7787FS
Stereo
Monaural
Product
Other functions
SYSTEM / PM BEEP input, SUSPEND, EVR, MUTE,
BEEP level control
Applications
•Notebook
computers
•1)Features
Stereo headphone amplifier that supports mixing
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.
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.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power
dissipation
BA7786FP-Y
BA7787FS
Symbol
Limits
Unit
VCC
6
V
850∗1
Pd
mW
600∗2
Operating temperature
Topr
– 10 ~ + 70
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗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
Min.
Typ.
Max.
Unit
VCC
4.5
5.0
5.5
V
1
Multimedia ICs
BA7786FP-Y / BA7787FS
SP VCC
LINE MIX ON / OFF
SP OUT1 R
SP OUT2 R
MONO / ST
SP GND
19
18
17
16
15
14
HP SUSPEND
SP SUSPEND
11
12
13
HP SUSPEND
SP SUSPEND
•Block diagram
HP VCC
HP OUT L
HP OUT R
HP GND
SP IN L
SP IN R
BA7786FP-Y
25
24
23
22
21
20
SP VCC
HP VCC
8
9
10
SP OUT1 L
SP OUT2 L
7
PM BEEP IN
6
LCH OUT
5
BEEP LEVEL
MUTE CTRL
4
SYSTEM BEEP IN
3
BIAS
2
LINE IN R
1
LINE IN L
VR
EVR CTRL
VR
•Pin descriptions
BA7786FP-Y
Pin No.
Function
Voltage
Type
1
EVR CTRL
EVR control pin
—
B (NPN)
2
LINE IN L
Line Lch input
2.5
B (PNP)
3
MUTE CTRL
Headphone mute control pin
5.0
100kΩ PULL UP
4
LINE IN R
Line Rch input
2.5
B (PNP)
5
BIAS
Bias
2.5
23.5kΩ
6
SYSTEM BEEP IN
SYSTEM BEEP input
2.5
B (NPN)
7
BEEP LEVEL
SYSTEM BEEP IN output level setting
4.2
C (PNP) ~ 3kΩ
8
LCH OUT
LINE IN L + SYSTEM BEEP IN output
—
C (PNP)
9
PM BEEP IN
PM beep input
2.5
B (NPN)
10
SP OUT1 L
BTL speaker Lch output (forward)
2.5
EF (NPN)
11
SP OUT2 L
BTL speaker Lch output (reverse)
2.5
EF (NPN)
12
HP SUSPEND
Headphone SUSPEND control
5.0
100kΩ PULL UP
13
SP SUSPEND
Speaker SUSPEND control
5.0
100kΩ PULL UP
14
SP GND
Speaker ground
0.0
—
15
MONO / ST
Speaker amplifier Lch ON / OFF control
5.0
100kΩ PULL UP
16
SP OUT2 R
BTL speaker Rch output (reverse)
2.5
EF (NPN)
17
SP OUT1 R
BTL speaker Rch output (forward)
2.5
EF (NPN)
18
LINE MIX ON / OFF
SP IN L / R input ON / OFF control
5.0
100kΩ PULL UP
19
SP VCC
Speaker Vcc
5.0
—
20
SP IN R
Speaker Rch input
2.5
B (NPN)
21
SP IN L
Speaker Lch input
2.5
B (NPN)
22
HP GND
Headphone ground
0.0
—
23
HP OUT R
Headphone Rch output
2.5
EF (NPN)
24
HP OUT L
Headphone Lch output
2.5
EF (NPN)
25
HP VCC
Headphone Vcc
5.0
—
Pin name
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 VCC = SP VCC = + 5.0V) in Fig. 1, entitled "Measurement circuit diagram,"
and do not guarantee standards.
2
Multimedia ICs
BA7786FP-Y / BA7787FS
HP VCC
HP OUT L
HP OUT R
HP GND
SP VCC
BEEP LEVEL
SP OUT1
SP OUT2
LINE MIX ON / OFF
SP GND
•Block diagram
20
19
18
17
16
15
14
13
12
11
BA7787FS
SP VCC
HP SUSPEND
SP SUSPEND
6
7
8
9
10
PM BEEP IN
HP SUSPEND
LINE IN R
5
SP IN
4
SYSTEM BEEP IN
3
BIAS
2
MUTE CTRL
EVR CTRL
1
VR
LINE IN L
VR
SP SUSPEND
HP VCC
BA7787FS
Pin No.
Pin name
Function
Pin voltage
Pin type
1
EVR CTRL
EVR control pin
—
2
LINE IN L
Line Lch input
2.5
B (PNP)
3
MUTE CTRL
Headphone mute control
5.0
100kΩ PULL UP
4
LINE IN R
Line Rch input
2.5
B (PNP)
5
BIAS
Bias
2.5
23.5kΩ
6
SYSTEM BEEP IN
SYSTEM BEEP input
2.5
B (NPN)
7
SP IN
Speaker input
2.5
B (NPN)
8
PM BEEP IN
PM BEEP input
2.5
B (NPN)
B (NPN)
9
HP SUSPEND
Headphone SUSPEND control
—
B (PNP)
10
SP SUSPEND
Speaker SUSPEND control
—
B (PNP)
11
SP GND
Speaker ground
0.0
—
12
LINE MIX ON / OFF
SP IN input ON / OFF control
5.0
100kΩ PULL UP
13
EF (NPN)
SP OUT2
BTL speaker output (reverse)
2.5
14
SP OUT1
BTL speaker output (forward)
2.5
EF (NPN)
15
BEEP LEVEL
SYSTEM BEEP IN output level setting
4.2
C (PNP) ~ 3kΩ
16
SP VCC
Speaker Vcc
5.0
—
17
HP GND
Headphone ground
0.0
—
18
HP OUT R
Headphone Rch output
2.5
EF (NPN)
19
HP OUT L
Headphone Lch output
2.5
EF (NPN)
20
HP VCC
Headphone Vcc
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 VCC = SP VCC = + 5.0V) in Fig. 2, entitled "Measurement circuit diagram,"
and do not guarantee standards.
3
Multimedia ICs
BA7786FP-Y / BA7787FS
•Control pin circuits
BA7786FP-Y
HP SUSPEND (12pin)
SP SUSPEND (12pin)
MUTE CTRL (3pin)
MONO / ST (15pin)
LINE MIX ON / OFF (18pin)
HP VCC
HP VCC
100k
HP VCC
100k
18pin
100k
20k
12,13pin
10k
3,15pin
10k
BA7787FS
LINE MIX ON / OFF (12pin)
HP SUSPEND (9pin)
SP SUSPEND (10pin)
MUTE CTRL (3pin)
HP VCC
HP VCC
HP VCC
100k
12pin
100k
20k
10k
10k
3pin
Note) All figures are design values, and do not represent guaranteed performance.
4
9,10pin
Multimedia ICs
BA7786FP-Y / BA7787FS
•Electrical characteristics (unless otherwise noted, Ta = 25°C, HP V
CC
= SP VCC = 5.0V, f = 1kHz)
BA7786FP-Y
Parameter
Conditions
Measurement circuit
Symbol
Min.
Typ.
Max.
Unit
Supply current
ICC
3.52
4.82
7.64
mA
No input, SP OUT = no load
Fig.1
Supply current SUSPEND
ICCS
175
240
410
µA
No input, VH = VS = H
Fig.1
VIN = – 10.0dBV
Fig.1
VIN = – 10.0dBV∗1
VIN = – 10.0dBV∗2
Fig.1
〈Supply current〉
〈HP AMP 1〉 INPUT: LINE IN L / R, OUTPUT: HP OUT L / R
dBV
– 7.4
– 4.0
– 1.5
THDHP
—
0.1
1.0
%
GEVR
70
90
—
dB
Maximum output level
VOMHP
– 1.6
+ 0.6
—
Output residual noise
VONHP
—
– 80
– 73
Interchannel crosstalk
CTHP
—
– 79
Muting level
MTHP
—
– 94
Output voltage level
Distortion
EVR variation range
VOHP
Fig.1
dBV
VE = HP VCC→VE = ground level differential
THD = 1%∗1
Fig.1
dBV
Rg = 1kΩ∗2
Fig.1
– 70
dBV
VIN = – 7.0dBV∗2
Fig.1
– 83
dBV
VIN = – 7.0dBV∗2, VM = L
Fig.1
VIN = 5.0VP-P
Fig.1
〈HP AMP 2〉 INPUT: SYSTEM BEEP IN, OUTPUT: HP OUT L / R
Output voltage level
VOHB
0.22
0.32
0.42
VP-P
Input threshold level
VHBH
4.5
—
5.0
VP-P
dBV
Fig.1
〈SP AMP 1〉 INPUT: SP IN L / R, OUTPUT: SP OUT L / R
Output voltage level
VOSP
– 1.4
+ 2.0
+ 4.5
—
0.4
1.5
%
+ 5.7
– 90
—
—
Distortion
THDSP
Maximum output level
VOMSP
+ 3.5
Output residual noise
VONSP
—
Interchannel crosstalk
CTSP
VOOFFSP
LINE MIX OFF level
VIN = – 10.0dBV
Fig.1
VIN = – 10.0dBV∗1
Fig.1
—
dBV
THD = 1%∗1
Fig.1
– 80
dBV
Rg = 1kΩ∗2
Fig.1
– 78
– 70
dBV
VIN = – 12.0dBV∗2
Fig.1
– 78
– 70
dBV
VIN = – 12.0dBV∗2, VL = L
Fig.1
dBV
VIN = – 10.0dBV
Fig.1
〈SP AMP 2〉 INPUT: PM BEEP IN, OUTPUT: SP OUT L / R
Output level
VOSB
– 7.4
– 4.0
– 1.5
〈MUTE CTRL〉 (pin 13)
HP MUTE ON holding voltage
VML
GND
—
0.4
V
Fig.1
HP MUTE OFF holding voltage
VMH
4.3
—
VCC
V
Fig.1
HP SUSPEND holding voltage
VHL
GND
—
0.4
V
Fig.1
HP SUSPEND holding voltage
VHH
4.3
—
VCC
V
Fig.1
HP SUSPEND holding voltage
VSL
GND
—
0.4
V
Fig.1
HP SUSPEND holding voltage
VSH
4.3
—
VCC
V
Fig.1
MONAURAL holding voltage
VNL
GND
—
0.4
V
Fig.1
STEREO holding voltage
VNH
4.3
—
VCC
V
Fig.1
LINE MIX OFF holding voltage
VLL
GND
—
0.4
V
Fig.1
LINE MIX ON holding voltage
VLH
4.3
—
VCC
V
Fig.1
〈HP SUSPEND〉 (pin 12)
〈SP SUSPEND〉 (pin 13)
〈MONO / STEREO〉 (pin 15)
〈LINE MIX ON / OFF〉 (pin 18)
∗1: B.W. = 0.4 ~ 30kHz
∗2: DIN audio mode settings are as follows, unless otherwise noted:
VE = 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)
5
Multimedia ICs
BA7786FP-Y / BA7787FS
BA7787FS
Parameter
Conditions
Measurement circuit
Symbol
Min.
Typ.
Max.
Unit
Supply current
ICC
3.10
4.25
6.74
mA
No input, SP OUT = no load
Fig.2
Supply current SUSPEND
ICCS
175
240
410
µA
No input, VH = VS = H
Fig.2
VIN = – 10.0dBV
Fig.2
VIN = – 10.0dBV∗1
VIN = – 10.0dBV∗2
Fig.2
〈Supply current〉
〈HP AMP 1〉 INPUT: LINE IN L / R, OUTPUT: HP OUT L / R
dBV
– 7.4
– 4.0
– 1.5
THDHP
—
0.1
1.0
%
GEVR
70
90
—
dB
Maximum output level
VOMHP
– 1.6
+ 0.6
—
Output residual noise
VONHP
—
– 80
– 73
Interchannel crosstalk
CTHP
—
– 79
Muting level
MTHP
—
– 94
Output voltage level
Distortion
EVR variation range
VOHP
Fig.2
dBV
VE = HP VCC→VE = ground level differential
THD = 1%∗1
Fig.2
dBV
Rg = 1kΩ∗2
Fig.2
– 70
dBV
VIN = – 7.0dBV∗2
Fig.2
– 83
dBV
VIN = – 7.0dBV∗2, VM = L
Fig.2
VIN = 5.0VP-P
Fig.2
〈HP AMP 2〉 INPUT: SYSTEM BEEP IN, OUTPUT: HP OUT L / R
Output voltage level
VOHB
0.22
0.32
0.42
VP-P
Input threshold level
VHBH
4.5
—
5.0
VP-P
dBV
Fig.2
〈SP AMP 1〉 INPUT: SP IN L / R, OUTPUT: SP OUT L / R
Output voltage level
VOSP
– 1.4
+ 2.0
+ 4.5
Distortion
THDSP
—
0.4
1.5
%
Maximum output level
VOMSP
+ 3.5
+ 5.7
—
dBV
Output residual noise
VONSP
—
– 90
– 80
Interchannel crosstalk
CTSP
—
– 78
– 70
VOOFFSP
—
– 78
– 70
LINE MIX OFF level
Fig.2
VIN = – 10.0dBV
VIN = – 10.0dBV∗1
Fig.2
THD = 1%∗1
Fig.2
dBV
Rg = 1kΩ∗2
Fig.2
dBV
VIN = – 12.0dBV∗2
Fig.2
dBV
VIN = – 12.0dBV∗2, VL = L
Fig.2
dBV
VIN = – 10.0dBV
Fig.2
〈SP AMP 2〉 INPUT: PM BEEP IN, OUTPUT: SP OUT L / R
Output level
VOSB
– 7.4
– 4.0
– 1.5
〈Control threshold voltage〉
〈MUTE CTRL〉 (pin 3)
HP MUTE ON holding voltage
VML
GND
—
0.4
V
—
Fig.2
HP MUTE OFF holding voltage
VMH
4.3
—
VCC
V
—
Fig.2
HP SUSPEND holding voltage
VHL
GND
—
0.4
V
—
Fig.2
HP SUSPEND holding voltage
VHH
4.3
—
VCC
V
—
Fig.2
SP SUSPEND holding voltage
VSL
GND
—
0.4
V
—
Fig.2
SP SUSPEND holding voltage
VSH
4.3
—
VCC
V
—
Fig.2
LINE MIX OFF holding voltage
VLL
GND
—
0.4
V
—
Fig.2
LINE MIX ON holding voltage
VLH
4.3
—
VCC
V
—
Fig.2
〈HP SUSPEND〉 (pin 9)
〈SP SUSPEND〉 (pin 10)
〈LINE MIX ON / OFF〉 (pin 12)
∗1: B.W. = 0.4 ~ 30kHz
∗2: DIN audio mode settings are as follows, unless otherwise noted:
VE = 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)
6
6
7
0.47µ
0.47µ
15k
15k
8
100
100
1k
1k
SP IN R
SP IN L
HP OUT R
HP OUT L
HP VCC
10
11
12
13
SP OUT L
8
18k
14
SP GND
VN
SP OUT R
9
PM BEEP IN
15
1µ
16
SP SUSPEND
8
17
VS
VR
18
HP SUSPEND
SP VCC
19
VH
0.47µ
HP VCC
VL
1k
20
SP VCC
LCH OUT
27k
+
390k
5
0.47µ
4
21
1k
3
33k
VR
HP GND
22
22µ
47µ
+
SYSTEM BEEP IN
1k
2
0.47µ
23
LINE IN R
27k
0.47µ
1
+
VM
1k
24
+
27k
25
LINE IN L
47µ
+
VE
Multimedia ICs
BA7786FP-Y / BA7787FS
•Measurement circuit
BA7786FP-Y
+
Fig.1
7
8
VR
4
SP VCC
5
+
Fig.2
7
8
9
10
PM BEEP IN
1k
18k
0.47µ
SP SUSPEND
6
15k
12
1k
13
0.47µ
14
SP IN
15
VS
16
VH
HP SUSPEND
HP VCC
33k
3
47µ
11
SP GND
390k
HP GND
17
1k
47µ
+
0.47µ
VR
22µ
18
SYSTEM BEEP IN
27k
2
1k
0.47µ
1
+
LINE IN R
27k
19
VM
1k
0.47µ
20
LINE IN L
VE
8
100
100
+
+
VL
SP OUT
SP VCC
HP OUT R
HP OUT L
HP VCC
Multimedia ICs
BA7786FP-Y / BA7787FS
BA7787FS
Multimedia ICs
BA7786FP-Y / BA7787FS
operation
•(1)Circuit
Gain between LINE IN L / LINE IN R and HP OUT L /
HP OUT R
GHP, the gain when EVR is at its maximum (VE = HP
VCC), is calculated as follows:
GHP ⱌ 20 ∗ LOG
60k
(dB)
1k + R
R
2
R
20
R
21
Gain between SP IN and SP OUT 1 / SP OUT 2
(BA7787FS)
This is calculated as follows.
GSP ⱌ 20 ∗ LOG
R
4
32k
(dB)
1k + R
R
Set so that 12k ⬉ R ⬉ 56k. This gain attenuates according to the pin 1 DC voltage (VE) (see Fig. 8). Mixing
input can be accommodated by attaching multiple resistors.
(2) Output level between SYSTEM BEEP IN and HP
OUT L / HP OUT R
Inputting a pulse wave to SYSTEM BEEP IN causes HP
OUT L and HP OUT R to output a pulse wave. The output level of this pulse wave depends on the resistance
between pin 7 and GND. The level when EVR is at its
maximum (VE = HP VCC) is calculated as follows.
VCC – 0.7
VHB ⱌ 0.5 ∗
∗ 60k (VP-P)
13k + R
7
(4) Gain between PM BEEP IN and SP OUT 1 / SP OUT 2
This is calculated as follows.
GSB ⱌ 20 ∗ LOG
20k
(dB)
1k + R
R
9
(BA7786FP-Y only, BA7787FS: pin 8)
This path is output regardless of whether LIN MIX ON /
OFF is at the high or low level.
R
7
(BA7786FP-Y only, BA7787FS: pin 15)
Set so that R ⭌ 100k (VHB ⬉ 1.1V). As with the path between LINE IN L / LINE IN R and HP OUT L / HP OUT
R, this level attenuates according to the pin 1 DC voltage.
(5) Gain between LINE IN L and LCH OUT
(BA7786FP-Y)
This gain (GHL) is calculated as follows.
GHL ⱌ 20 ∗ LOG
R8
(dB)
2 ∗ R2
R2
2
(3) Gain between SP IN L / SP IN R and SP OUT L / SP
OUT R (BA7786FP-Y)
This is calculated as follows.
GSP ⱌ 20 ∗ LOG
32k
(dB)
1k + R
8
R8
This path is not controlled by EVR or the mute function.
9
Multimedia ICs
BA7786FP-Y / BA7787FS
(6) Output level between SYSTEM BEEP IN and LCH
OUT (BA7786FP-Y)
Inputting a pulse wave to SYSTEM BEEP IN causes
LCH OUT to output a pulse wave. The output level of
this pulse wave depends on the resistance between pin
7 and GND and between pin 8 and GND, and is calculated as follows.
VHS ⱌ 0.25 ∗
VCC – 0.7
∗ R8 (VP-P)
13k + R7
R7
7
8
R8
This path is not controlled by EVR or the mute function.
(7) EVR control characteristics
The headphone amplifier is controlled by changing the
resistive potential division ratio.
10
Multimedia ICs
BA7786FP-Y / BA7787FS
pins
•(1)Control
MUTE CTRL
• Turns the headphone mute function on and off.
Control signal: VM
HP MUTE ON
L
HP MUTE OFF
H (OPEN)
Note
Turns off HP AMP output
—
(2) HP SUSPEND
• Turns the headphone suspend function on and off.
Control signal: VH
Note
HP SUSPEND
L
The headphone amplifier operates
HP SUSPEND
H
The headphone amplifier turns off
• Because the BA7786FP-Y has a pull-up resistor, this is possible even when open (if at the high level).
(3) SP SUSPEND
• Turns the speaker suspend function on and off.
Control signal: VS
Note
SP SUSPEND
L
The speaker amplifier operates
SP SUSPEND
H
The speaker amplifier turns off
• Because the BA7786FP-Y has a pull-up resistor, this is possible even when open (if at the high level).
(4) LINE MIX ON / OFF
• Turns the SP IN input on and off according to SP OUT.
Control signal: VL
LINE MIX OFF
L
LINE MIX ON
H (OPEN)
Note
Stops the output of SP IN input to SP OUT
—
(5) MONO / STEREO (BA7786FP-Y)
• Turns SP AMP LCH on and off.
Control signal: VN
Note
SP AMP LCH OFF
L
SP AMP LCH turns off
SP AMP LCH ON
H (OPEN)
SP AMP LCH operates
11
Multimedia ICs
BA7786FP-Y / BA7787FS
Application example
•BA7786FP-Y
VCC
EVR CTRL
LINE IN L
27k
HP VCC
1
2
∗
MUTE CTRL
LINE IN R
VR
VR
23
4
∗
VR
22
HP VCC
+
24
3
27k
25
+
100
+
100
HP GND
15k
+
33k
5
BIAS
15k
21
6
SYSTEM BEEP IN
HP JACK
20
∗
BEEP LEVEL
390k
27k
7
SP VCC
LCH OUT
8
19
PM BEEP IN
9
18
10
17
11
16
SP
8Ω
HP SUSPEND
12
HP SUSPEND
15
SP SUSPEND
13
SP SUSPEND
14
∗
+
SP VCC
SP
8Ω
MONO / ST
SP GND
is for mixing input.
Fig. 3
Pin
No.
12
TERMINAL
NAME
FUNCTION
L
H
TERMINAL
FORM
3
MUTE CTRL
HP MUTE ON
HP MUTE OFF
100k PULL UP
12
HP SUSPEND
HP OPERATED
HP SUSPENDED
100k PULL UP
13
SP SUSPEND
SP OPERATED
SP SUSPENDED
100k PULL UP
15
MONO / ST
LCH SP OFF
LCH SP ON
100k PULL UP
18
LINE MIX ON / OFF
LINE MIX OFF
LINE MIX ON
100k PULL UP
Multimedia ICs
BA7786FP-Y / BA7787FS
BA7787FS
VCC
EVR CTRL
VR
27k
∗
27k
∗
+
∗
15k
PM BEEP IN
+
100
+
100
17
SP VCC
5
18k
HP JACK
HP GND
VR
16
SP VCC
+
BIAS
33k
15k
18
4
HP VCC
+
19
VR
3
LINE IN R
SYSTEM BEEP IN
20
2
LINE IN L
MUTE CTRL
HP VCC
1
390k
6
15
7
14
SP
8Ω
13
8
HP SUSPEND
9
HP SUSPEND
12
SP SUSPEND
10
SP SUSPEND
11
SP GND
∗
is for mixing input
Fig. 4
FUNCTION
Pin
No.
TERMINAL
NAME
L
H
TERMINAL
FORM
3
MUTE CTRL
HP MUTE ON
HP MUTE OFF
100k PULL UP
9
PNP BASE
HP SUSPEND
HP OPERATED
HP SUSPENDED
10
SP SUSPEND
SP OPERATED
SP SUSPENDED
PNP BASE
12
LINE MIX ON / OFF
LINE MIX OFF
LINE MIX ON
100k PULL UP
13
Multimedia ICs
BA7786FP-Y / BA7787FS
•Electrical characteristic curves
– 40
INPUT: LINE IN L
– 50 OUTPUT: HP OUT L
VIN = – 30dBV
– 60 HP VCC = 5.0V
SP VCC = 5.0V
– 70
VE = 5.0V
– 80
+ 180
– 90
INPUT: LINE IN L
OUTPUT: HP OUT L
f = 1kHz
HP VCC = 5.0V
SP VCC = 5.0V
VE = 5.0V
B.W. = 0.4 ~ 30kHz
10
0
OUTPUT LEVEL: VO (dBV)
PHASE (deg)
OUTPUT LEVEL: VO (dBV)
– 30
OUTPUT DISTORTION: THD (%)
10
– 20
RL = 100Ω
RL = ∞
1
0.1
– 10
VM = 5.0V
– 20
INPUT: LINE IN L
OUTPUT: HP OUT L
VIN = – 6.4dBV
HP VCC = 5.0V
SP VCC = 5.0V
VE = 5.0V
DIN AUDIO
– 30
– 40
– 50
– 60
– 70
– 80
– 100
VM = GND
– 90
100
1k
10k
100k
1M
– 180
10M
0.01
– 40
– 30
– 20
– 10
0
FREQUENCY: f (Hz)
INPUT LEVEL: VIN (dBV)
Fig. 5 HP AMP frequency
characteristics
Fig. 6 HP AMP input level vs.
output distortion
– 100
10
100
1k
10k
100k
FREQUENCY: f (Hz)
Fig. 7 HP AMP MUTE
characteirstics
0
– 50
INPUT: LINE IN L
OUTPUT: HP OUT L
VIN = – 10dBV, f = 1kHz
HP VCC = 5.0V
SP VCC = 5.0V
DIN AUDIO
– 100
0
0.5
1.0
1.0
INPUT: LINE IN L
OUTPUT: HP OUT L
VIN = 5.0Vpp, f = 10kHz
HP VCC = 5.0V
SP VCC = 5.0V
0.1 VE = 5.0V
10k
VOLTAGE RATIO: VE / VCC
RL = 8Ω
RL = ∞
– 10
VL = 5.0V
INPUT: SP IN
OUTPUT: SP OUT 1 / 2
VIN = – 11.6dBV
HP VCC = 5.0V
SP VCC = 5.0V
DIN AUDIO
– 20
– 30
– 40
– 50
– 60
– 70
– 80
VL = GND
– 90
0.01
– 50
– 40
– 30
– 20
– 10
0
INPUT LEVEL: VIN (dBV)
Fig. 11 SP AMP input level vs.
output distortion
14
– 100
10
100
1k
10k
FREQUENCY: f (Hz)
Fig. 12 SP AMP MUTE
characteristics
INPUT: SP IN
OUTPUT: SP OUT 1
VIN = – 30dBV
HP VCC = 5.0V
SP VCC = 5.0V
– 100
100
1k
10k
100k
1M
FREQUENCY: f (Hz)
0
RL = speaker (8Ω)
0.1
BA7786FP-Y: 7pin
BA7787FS: 15pin
10
INPUT: SP IN
OUTPUT: SP OUT 1 / 2, f = 1kHz
HP VCC = 5.0V, SP VCC = 5.0V
VE = 5.0V, B.W. = 0.4 ~ 30kHz
1
1M
Fig. 9 SYSTEM BEEP output level vs.
external resistor.
OUTPUT LEVEL: VO (dBV)
OUTPUT DISTORTION: THD (%)
10
100k
RESISTOR: R (Ω)
Fig. 8 HP AMP EVR
characteristics
OUTPUT LEVEL: VO (dBV)
OUTPUT LEVEL: VO (Vpp)
OUTPUT LEVEL: VO (dBV)
– 20
100k
Fig.10 SP AMP frequency
characteristics
10M
Multimedia ICs
BA7786FP-Y / BA7787FS
Board circuit
•BA7786FP-Y
VCC
27k
2
R3
VR
24
C1
0.1µ
R5
4
R6
22
R7
0.1µ
R8
5
BIAS
21
HP JACK
100
R14
100
HP OUT L
HP GND
R16
15k
HP OUT R
0.1µ
HP GND
C14
C3
6
R9
R15
HP GND
R17
15k
+
33k
VR
C2
47µ
SYSTEM BEEP IN
23
47µ C9
R4
27k
0.1µ
C12
47µ C10
3
LINE IN R
100µ
C11
0.1µ
R2
HP VCC
+
+
LINE IN L
25
+
R1
HP VCC
1
VR1
20
0.1µ
C13
C4
R10
7
BEEP LEVEL
R11
390k
27k
0.1µ
LCH OUT
C5
R13
PM BEEP IN
18k
SP VCC
8
19
0.1µ
C6
+
SP VCC
100µ
C7
9
0.1µ
C8
3
2
18
1
18k
SP OUT1 L
10
17
SP OUT1 R
SP OUT2 L
11
16
SP OUT2 R
MUTE
12
HP SUSPEND
15
13
SP SUSPEND
14
HP SUS
SP SUS
SP GND
LCH ON / OFF
MIX ON / OFF
HP VCC
Fig. 13
15
Multimedia ICs
BA7786FP-Y / BA7787FS
BA7787FS
R3
2
19
VR
3
18
R4
LINE IN R
R5
R6
0.1µ
4
+
SYSTEM BEEP IN
R7
R9
15k
R10
15k
R11
GND
GND
PM BEEP IN
R12
18k
47µ
47µ
HP JACK
100
C10
R14
100
C9
VR
HP OUT L
HP GND
17
HP OUT R
C2
GND
R8
HP GND
R15
HP GND
47µ
33k
HP VCC
0.1µ
C12
C1
GND
27k
+100µ
+
R2
20
C11
0.1µ
+
27k
LINE IN L
HP VCC
1
VR1
R1
0.1µ
C4
5
C3
HP GND
SP VCC
16
+ 100µ
C7
BIAS
6
15
SP VCC
0.1µ
C8
R13 BEEP LEVEL
SP GND
390k
0.1µ
C5
7
14
SP OUT1
8
13
SP OUT2
0.1µ
C6
MUTE
2
9
HP SUSPEND
12
3
HP SUS
SP GND
SP SUS
10
SP SUSPEND
MIX ON / OFF
HP VCC
Fig. 14
16
11
1
Multimedia ICs
BA7786FP-Y / BA7787FS
•Part table
BA7786FP-Y
No.
R1
R2
R3
R4
R5
R6
Use
Used to set the gain from LINE IN L / LINE IN R (pins 2 and 4) to HP OUT
L / HP OUT R (pins 24 and 23)
(See section 1, on circuit operation for the formula.)
A wide range of mixing ratios can be set by changing the values of
R1, R2 and R3 (or R4, R5 and R6).
Standard value
27kΩ
27kΩ
27kΩ
27kΩ
27kΩ
27kΩ
R7
R8
R9
Resistors for mixing SYSTEM BEEP IN (pin 6). Because the threshold voltage
between the high and low levels is fixed inside the IC, these resistors should be
set to 33kΩ
33kΩ
33kΩ
33kΩ
R10
Used to set the output level from SYSTEM BEEP IN (pin 6) to HP OUT
L / HP OUT R (pins 24 and 23). (See section 2, on circuit operation for the formula.)
390kΩ
R11
• No need to attach. Connect pin 8 to a ground.
—
R13
• Used to set the gain from PM BEEN IN (pin 9) to SP OUT L / SP OUT R
(pins 10, 11, 16 and 17). (See section 4, on circuit operation for the formula.)
18kΩ
R14
R15
• The load resistor for HP OUT R.
• The load resistor for HP OUT L.
100Ω
100Ω
R16
R17
Used to set the gain from SP IN L / R (pins 21 and 20) to SP OUT L / R (pins 10, 11,
16 and 17). (See section 3, on circuit operation for the formula.)
15kΩ
15kΩ
C1
• The coupling capacitor for LINE IN L
0.1µF
C2
• The coupling capacitor for LINE IN R
0.1µF
C3
• The ripple rejection capacitor for the bias pin
47µF
C4
• The coupling capacitor for SYSTEM BEEP IN
0.1µF
C5
• No need to attach
C6
• The coupling capacitor for PM BEEP IN
0.1µF
C7
• The bypass capacitor for SP VCC (used for low-frequency ripple rejection)
100µF
—
C8
• The bypass capacitor for SP VCC (used for high-frequency ripple rejection)
0.1µF
C9
• The coupling capacitor for HP OUT R
47µF
C10
• The coupling capacitor for HP OUT L
47µF
C11
• The bypass capacitor for HP VCC (used for low-frequency ripple rejection)
100µF
C12
• The bypass capacitor for HP VCC (used for high-frequency ripple rejection)
0.1µF
C13
• The coupling capacitor for SP IN R
0.1µF
C14
• The coupling capacitor for SP IN L
0.1µF
VR1
• Used to change the pin 1 DC voltage
20kΩ
17
Multimedia ICs
BA7786FP-Y / BA7787FS
BA7787FS
No.
18
Use
Standard value
R1
R2
R3
R4
R5
R6
Used to set the gain from LINE IN L / LINE IN R (pins 2 and 4) to HP OUT
L / HP OUT R (pins 19 and 18) (See section 1, on circuit operation for the formula.)
A wide range of mixing ratios can be set by changing the values of R1, R2 and
R3 (or R4, R5 and R6).
27kΩ
27kΩ
27kΩ
27kΩ
27kΩ
27kΩ
R7
R8
R9
Resistors for mixing SYSTEM BEEP IN (pin 6). Because the threshold voltage
between the high and low levels is fixed inside the IC, these resistors should be set
to 33kΩ.
33kΩ
33kΩ
33kΩ
R10
R11
• Used to set the gain from SP IN (pin 7) to SP OUT 1 / SP OUT 2
(pins 14 and 13). (See section 3, on circuit operation for the formula.)
15kΩ
15kΩ
R12
• Used to set the gain from PM BEEP IN (pin 8) to SP OUT 1 / SP OUT 2
(pins 14 and 13). (See section 4, on circuit operation for the formula.)
18kΩ
R13
• Used to set the output level from SYSTEM BEEP IN (pin 6) to HP OUT
L / HP OUT R (pins 19 and 18). (See section 2, on circuit operation for the formula.)
390kΩ
R14
• The load resistor for HP OUT R.
R15
• The load resistor for HP OUT L.
100Ω
100Ω
C1
• The coupling capacitor for LINE IN L
0.1µF
C2
• The coupling capacitor for LINE IN R
0.1µF
C3
• The ripple rejection capacitor for the bias pin
47µF
C4
• The coupling capacitor for SYSTEM BEEP IN
0.1µF
C5
• The coupling capacitor for SP IN
0.1µF
C6
• The coupling capacitor for PM BEEP IN
0.1µF
C7
• The bypass capacitor for SP VCC (used for low-frequency ripple rejection)
100µF
C8
• The bypass capacitor for SP VCC (used for high-frequency ripple rejection)
0.1µF
C9
• The coupling capacitor for HP OUT R
47µF
C10
• The coupling capacitor for HP OUT L
47µF
C11
• The bypass capacitor for HP VCC (used for low-frequency ripple rejection)
100µF
C12
• The bypass capacitor for HP VCC (used for high-frequency ripple rejection)
VR1
• Used to change the pin 1 DC voltage
0.1µF
20kΩ
Multimedia ICs
notes
•(1)Operation
Popping noises occurring when the power is turned
on
• When the power is turned on, the headphone mute
function should be on and the suspend function off in
order to prevent popping noises from occurring when
VCC turns on.
(2) The supply voltages for HP VCC and SP VCC should
come from the same power supply. Using separate
power supplies can lead to output voltage drops and
malfunctioning.
BA7786FP-Y / BA7787FS
(4) Make sure the input resistance for the SYSTEM
BEEP IN pin is 33kΩ.
33k
(5) Configure the PM BEEP IN pin of BA7786FP-Y as
shown below in order to prevent oscillation in the IC.
(3) The common impedance of the two power supply
lines (HP VCC and SP VCC) should be kept as low as
possible.
(6) The LCH OUT pin (pin 8) of BA7786FP-Y should be
grounded when not used.
(7) When switching the suspend function popping noises may occur. If this bothers, take measures for eliminating it by attachig external componets.
19
Multimedia ICs
BA7786FP-Y / BA7787FS
Board labelling diagram
•BA7786FP-Y
APB-BA7786FP-Y
SP
SP
OUT1 OUT2
L
L
1
LCH
SP
MIX
SUS
ON / ON /
OFF OFF
3
SP
OUT2
R
J11
J1
J12
2
SP
OUT1
R
J9
SP
GND
HP
SUS
J10
J2
MUTE
J3
14
G
R11
C7
C8
C5
LCH
OUT
PM
G
BEEP IN
R12
13
C6
R13
SP
VCC
J8
J4
R17
G
R10
C10
R16
C14
1
R8
25
SYSTEM
BEEP IN
C13
C4
R9
C9
J6
J7
R7
J5
C3
C11
C1
VR1
LINE IN
R
R5
R4
GND
R3 R2 R1
R14
C12
R15
GND
C2
R6
TO HEADPHONE JACK
LINE IN
L
HP
VCC
HP
GND
HP R
GND
HP
OUT R
HP
OUT L
HP L
GND
Fig. 15
LINE IN L: Line input Lch
LINE IN R: Line input Rch
SYSTEM BEEP IN: System beep sound input
PM BEEP IN: PM beep sound input
HP OUT L: Headphone output Lch monitor
HP OUT R: Headphone output Rch monitor
SP OUT L 1 / 2: Speaker connection pin (BTL)
SP OUT R 1 / 2: Speaker connection pin (BTL)
SP VCC: Supply voltage input + 5.0V
HP VCC: Supply voltage input + 5.0V
20
VR1: Electric volume adjuster va
(On this board, GHP is set to its maximum by turning
the volume adjuster clockwise as far as it will go.)
MUTE: MUTE control switch
HP SUS: HP suspend control switch
SP SUS: SP suspend control switch
MIX ON / OFF: LINE MIX ON / OFF switch
(On this board, pin 12 automatically drops to the
ground level when a headphone is plugged into the
jack.)
LCH ON / OFF: SP AMP LCH ON / OFF switch
Multimedia ICs
BA7786FP-Y / BA7787FS
Board pattern diagram
•BA7786FP-Y
Fig. 16
21
Multimedia ICs
BA7786FP-Y / BA7787FS
Board labelling diagram
•BA7787FS
APB-BA7787FS
1
SP
MIX
SUS
ON /
OFF
J1
SP
OUT2
3
2
HP
SUS
SP
OUT1
MUTE
SP
GND
J2
J3
SP
VCC
J4
G
J8
C5
R9
SYSTEM
BEEP IN
R13
C4
C7
C8
11
C6
10
PM G
BEEP IN
R12
R8
C3
R7
C10
C9
20
1
J5
C2
GND
C1
R6
C11
R4
J6
J7
R11
GND
R3
TO HEADPHONE JACK
LINE IN
L
R2
R1
R14
R15
C12
R10
VR1
LINE IN
R
R5
HP
VCC
HP
GND
HP R
GND
HP
OUT R
HP
OUT L
HP L
GND
Fig. 17
LINE IN L: Line input Lch
LINE IN R: Line input Rch
SYSTEM BEEP IN: System beep sound input
PM BEEP IN: PM beep sound input
HP OUT L: Headphone output Lch monitor
HP OUT R: Headphone output Rch monitor
SP OUT 1: Speaker connection pin (BTL)
SP OUT 2: Speaker connection pin (BTL)
SP VCC: Supply voltage input + 5.0V
HP VCC: Supply voltage input + 5.0V
22
VR1: Electric volume adjuster va
(On this board, GHP is set to its maximum by turning
the volume adjuster clockwise as far as it will go.)
MUTE: MUTE control switch
HP SUS: HP suspend control switch
SP SUS: SP suspend control switch
MIX ON / OFF: LINE MIX ON / OFF switch
(On this board, pin 12 automatically drops to the
ground level when a headphone is plugged into the
jack.)
Multimedia ICs
BA7786FP-Y / BA7787FS
Board pattern diagram
•BA7787FS
Fig. 18
23
Multimedia ICs
BA7786FP-Y / BA7787FS
•External dimensions (Units: mm)
BA7786FP-Y
BA7787FS
13.6 ± 0.2
8.7 ± 0.2
0.36 ± 0.1
1.8 ± 0.1
1
10
0.8
0.36 ± 0.1
0.3Min.
0.3Min.
0.15
0.15
HSOP25
24
0.25 ± 0.1
7.8 ± 0.3
0.8
11
0.15 ± 0.1
13
1.95 ± 0.1
20
5.4 ± 0.2
1
0.11
14
5.4 ± 0.2
0.11
1.9 ± 0.1
7.8 ± 0.3
2.75 ± 0.1
25
SSOP-A20