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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.
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 amplifier and speaker amplifier, for low-power-consumption computers . 5) Two beep input pins, a necessity for notebook computers.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation BA7786FP-Y BA7787FS Symbol VCC Pd Topr Tstg Limits 6 8501 6002 - 10 ~ + 70 - 55 ~ + 125 Unit V mW C C
Operating temperature Storage temperature
1 Reduced by 6.8mW for each increase in Ta of 1C over 25C. 2 Reduced by 6.0mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCC 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 VCC SP VCC 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 VCC
SP VCC
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
*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 VCC SP IN R SP IN L HP GND HP OUT R HP OUT L HP VCC 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) 100k PULL UP B (PNP) 23.5k B (NPN) C (PNP) ~ 3k C (PNP) B (NPN) EF (NPN) EF (NPN) 100k PULL UP 100k PULL UP -- 100k PULL UP EF (NPN) EF (NPN) 100k 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 VCC = SP VCC = + 5.0V) in Fig. 1, entitled "Measurement circuit diagram," and do not guarantee standards.
2
HP SUSPEND
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 VCC SP VCC LINE MIX ON / OFF SP GND 11 10 SP SUSPEND
20
19
18
17
16
15
14
13
12
HP VCC
SP VCC
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 VCC HP GND HP OUT R HP OUT L HP VCC 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) 100k PULL UP B (PNP) 23.5k B (NPN) B (NPN) B (NPN) B (PNP) B (PNP) -- 100k PULL UP EF (NPN) EF (NPN) C (PNP) ~ 3k -- -- 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 VCC = SP VCC = + 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 VCC
HP SUSPEND (12pin) SP SUSPEND (12pin)
HP VCC
LINE MIX ON / OFF (18pin)
HP VCC
100k
100k 18pin 20k 12,13pin
100k 10k 3,15pin 10k
BA7787FS MUTE CTRL (3pin)
HP VCC
HP SUSPEND (9pin) SP SUSPEND (10pin)
HP VCC
LINE MIX ON / OFF (12pin)
HP VCC
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
*Electrical characteristics (unless otherwise noted, Ta = 25C, HP VCC = SP VCC = 5.0V, f = 1kHz)
BA7786FP-Y
Parameter Supply current Supply current Supply current SUSPEND ICC ICCS 3.52 175 4.82 240 7.64 410 mA A No input, SP OUT = no load No input, VH = VS = H Fig.1 Fig.1 Symbol Min. Typ. Max. Unit Conditions Measurement circuit
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 VOHP THDHP GEVR VOMHP VONHP CTHP MTHP - 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 VIN = - 10.0dBV VIN = - 10.0dBV1 VIN = - 10.0dBV2 VE = HP VCCVE = ground level differential THD = 1%1 Rg = 1k2 VIN = - 7.0dBV2 VIN = - 7.0dBV2, VM = 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 VOHB VHBH 0.22 4.5 0.32 -- 0.42 5.0 VP-P VP-P VIN = 5.0VP-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 VOSP THDSP VOMSP VONSP CTSP VOOFFSP - 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 VIN = - 10.0dBV VIN = - 10.0dBV1 THD = 1%1 Rg = 1k2 VIN = - 12.0dBV2 VIN = - 12.0dBV2, VL = 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 VLL VLH GND 4.3 -- -- 0.4 VCC V V Fig.1 Fig.1 VNL VNH GND 4.3 -- -- 0.4 VCC V V Fig.1 Fig.1 VSL VSH GND 4.3 -- -- 0.4 VCC V V Fig.1 Fig.1 VHL VHH GND 4.3 -- -- 0.4 VCC V V Fig.1 Fig.1 VML VMH GND 4.3 -- -- 0.4 VCC V V Fig.1 Fig.1 VOSB - 7.4 - 4.0 - 1.5 dBV VIN = - 10.0dBV Fig.1
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
BA7787FS
Parameter Supply current Supply current Supply current SUSPEND ICC ICCS 3.10 175 4.25 240 6.74 410 mA A Symbol Min. Typ. Max. Unit
BA7786FP-Y / BA7787FS
Conditions
Measurement circuit
No input, SP OUT = no load No input, VH = VS = H
Fig.2 Fig.2
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 VOHP THDHP GEVR VOMHP VONHP CTHP MTHP - 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 VIN = - 10.0dBV VIN = - 10.0dBV1 VIN = - 10.0dBV2 VE = HP VCCVE = ground level differential THD = 1%1 Rg = 1k2 VIN = - 7.0dBV2 VIN = - 7.0dBV2, VM = L Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2
HP AMP 2 INPUT: SYSTEM BEEP IN, OUTPUT: HP OUT L / R Output voltage level Input threshold level VOHB VHBH 0.22 4.5 0.32 -- 0.42 5.0 VP-P VP-P VIN = 5.0VP-P Fig.2 Fig.2
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 VOSP THDSP VOMSP VONSP CTSP VOOFFSP - 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 VIN = - 10.0dBV VIN = - 10.0dBV1 THD = 1%1 Rg = 1k2 VIN = - 12.0dBV2 VIN = - 12.0dBV2, VL = L Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2
SP AMP 2 INPUT: PM BEEP IN, OUTPUT: SP OUT L / R Output level Control threshold voltage 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 VLL VLH GND 4.3 -- -- 0.4 VCC V V -- -- Fig.2 Fig.2 VSL VSH GND 4.3 -- -- 0.4 VCC V V -- -- Fig.2 Fig.2 VHL VHH GND 4.3 -- -- 0.4 VCC V V -- -- Fig.2 Fig.2 VML VMH GND 4.3 -- -- 0.4 VCC V V -- -- Fig.2 Fig.2 VOSB - 7.4 - 4.0 - 1.5 dBV VIN = - 10.0dBV Fig.2
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
BA7786FP-Y
25
HP VCC
+
1
VE HP VCC 47 2 24
+
*Measurement circuit
Multimedia ICs
27k VR LINE IN L HP OUT L 100 HP OUT R 100 4 22 VR 1k 0.47 47 3
+
23
VM 27k LINE IN R 1k HP GND 15k 1k SP IN L 0.47 15k 20 6 SYSTEM BEEP IN 1k 0.47 33k 0.47 SP IN R 1k 21 5
+
0.47
22
SP VCC
19
LCH OUT 8
+
1 18 9 PM BEEP IN 1k 0.47 10 17 18k VL
SP OUT L
8 11 16
VH
HP SUSPEND
VS
SP SUSPEND
BA7786FP-Y / BA7787FS
SP GND
+
Fig.1
390k 7 27k SP VCC 8 SP OUT R 12 13 15 14 VN
7
8 BA7787FS
1 20 HP VCC VE
+
Multimedia ICs
HP VCC
0.47 2 19 VR LINE IN L
47 HP OUT L 100 HP OUT R 100 17 VR 4
+
1k 47 3 18 VM
27k
+
0.47 LINE IN R 1k 22 16 5 SP VCC
+
27k
HP GND
+
SP VCC 390k
Fig.2
0.47 6 SYSTEM BEEP IN 1k 0.47 7 SP IN 1k 0.47 8 PM BEEP IN 1k 9 VH 18k 15k 33k HP SUSPEND 10 VS SP SUSPEND
15 14 8 13 12 11 SP GND VL SP OUT
BA7786FP-Y / BA7787FS
Multimedia ICs
operation *Circuit between LINE IN L / LINE IN R and HP OUT L / (1) Gain HP OUT R GHP, the gain when EVR is at its maximum (VE = HP VCC), is calculated as follows: GHP 20 LOG 60k (dB) 1k + R
BA7786FP-Y / BA7787FS
R 20
R 21
R 2
Gain between SP IN and SP OUT 1 / SP OUT 2 (BA7787FS) This is calculated as follows. GSP 20 LOG 32k (dB) 1k + R
R 4
R 7
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.
(4) Gain between PM BEEP IN and SP OUT 1 / SP OUT 2 This is calculated as follows. GSB 20 LOG 20k (dB) 1k + R
(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. VHB VCC - 0.7 0.5 60k (VP-P) 13k + R
R 7
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.
(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 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 20 LOG 32k (dB) 1k + R
8 R8
This path is not controlled by EVR or the mute function.
9
Multimedia ICs
(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 0.25 VCC - 0.7 R8 (VP-P) 13k + R7
R7 7
BA7786FP-Y / BA7787FS
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
*Control pins (1) MUTE CTRL
* Turns the headphone mute function on and off.
Control signal: VM HP MUTE ON HP MUTE OFF L H (OPEN) Note Turns off HP AMP output --
(2) HP SUSPEND * Turns the headphone suspend function on and off.
Control signal: VH HP SUSPEND HP SUSPEND L H Note The headphone amplifier operates 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 SP SUSPEND SP SUSPEND L H Note The speaker amplifier operates 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 LINE MIX ON L 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 SP AMP LCH OFF SP AMP LCH ON L H (OPEN) Note SP AMP LCH turns off SP AMP LCH operates
11
Multimedia ICs
BA7786FP-Y / BA7787FS
*Application example BA7786FP-Y
VCC EVR CTRL 27k VR 1 HP VCC 25
+ + +
HP GND 15k
HP VCC 100 HP JACK
LINE IN L
2
VR
24
MUTE CTRL 27k

33k
100
3
23
LINE IN R
4 BIAS
VR
22
15k
+
5
21
SYSTEM BEEP IN
6
20
BEEP LEVEL 390k 27k 7 SP VCC LCH OUT 8 19
+
SP VCC
PM BEEP IN
9
18
10 SP 8
17 SP 8
11
16
HP SUSPEND
12
HP SUSPEND
15 SP GND
MONO / ST
SP SUSPEND
13
SP SUSPEND
14
is for mixing input.
Fig. 3
Pin No. 3 12 13 15 18
TERMINAL NAME MUTE CTRL HP SUSPEND SP SUSPEND MONO / ST LINE MIX ON / OFF
FUNCTION L HP MUTE ON HP OPERATED SP OPERATED LCH SP OFF LINE MIX OFF H HP MUTE OFF HP SUSPENDED SP SUSPENDED LCH SP ON LINE MIX ON
TERMINAL FORM 100k PULL UP 100k PULL UP 100k PULL UP 100k PULL UP 100k PULL UP
12
Multimedia ICs
BA7787FS
BA7786FP-Y / BA7787FS
VCC EVR CTRL 27k LINE IN L VR 1
HP VCC 20
+ + +
HP GND 100
HP VCC HP JACK
2
MUTE CTRL 27k LINE IN R

33k
VR
19
100
3
18
4
VR SP VCC
17
+
5 BIAS
16
+
390k
SP VCC
SYSTEM BEEP IN 15k 15k 18k
6
15
7
14 SP 8
PM BEEP IN
8
13
HP SUSPEND
9
HP SUSPEND
12 SP GND
SP SUSPEND
10
SP SUSPEND
11
is for mixing input
Fig. 4
Pin No. 3 9 10 12
TERMINAL NAME MUTE CTRL HP SUSPEND SP SUSPEND LINE MIX ON / OFF
FUNCTION L HP MUTE ON HP OPERATED SP OPERATED LINE MIX OFF H HP MUTE OFF HP SUSPENDED SP SUSPENDED LINE MIX ON
TERMINAL FORM 100k PULL UP PNP BASE PNP BASE 100k PULL UP
13
Multimedia ICs
BA7786FP-Y / BA7787FS
*Electrical characteristic curves
OUTPUT DISTORTION: THD (%) - 20 OUTPUT LEVEL: VO (dBV) - 30 PHASE (deg) - 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 - 90 OUTPUT LEVEL: VO (dBV) 10 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 RL = 100 RL =
10 0 - 10 - 20 - 30 - 40 - 50 - 60 - 70 - 80 - 90 VM = GND 100 1k 10k 100k VM = 5.0V INPUT: LINE IN L OUTPUT: HP OUT L VIN = - 6.4dBV HP VCC = 5.0V SP VCC = 5.0V VE = 5.0V DIN AUDIO
1
+ 180
0.1
- 100 100 1k 10k 100k 1M - 180 10M 0.01 - 40 - 30 - 20 - 10 0
- 100 10
FREQUENCY: f (Hz)
INPUT LEVEL: VIN (dBV)
FREQUENCY: f (Hz)
Fig. 5 HP AMP frequency characteristics
Fig. 6 HP AMP input level vs. output distortion
Fig. 7 HP AMP MUTE characteirstics
0 - 20 OUTPUT LEVEL: VO (dBV) OUTPUT LEVEL: VO (dBV) OUTPUT LEVEL: VO (Vpp)
1.0
- 50 INPUT: LINE IN L OUTPUT: HP OUT L VIN = - 10dBV, f = 1kHz HP VCC = 5.0V SP VCC = 5.0V DIN AUDIO 0.5 VOLTAGE RATIO: VE / VCC 1.0
INPUT: SP IN OUTPUT: SP OUT 1 VIN = - 30dBV HP VCC = 5.0V SP VCC = 5.0V
- 100 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 RESISTOR: R () 100k BA7786FP-Y: 7pin BA7787FS: 15pin 1M
- 100 100
1k
10k
100k
1M
10M
FREQUENCY: f (Hz)
Fig. 8 HP AMP EVR characteristics
Fig. 9 SYSTEM BEEP output level vs. external resistor.
Fig.10 SP AMP frequency characteristics
10 OUTPUT DISTORTION: THD (%)
OUTPUT LEVEL: VO (dBV)
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 RL = speaker (8) RL = 8 RL =
10 0 - 10 - 20 - 30 - 40 - 50 - 60 - 70 - 80 - 90 VL = GND VL = 5.0V INPUT: SP IN OUTPUT: SP OUT 1 / 2 VIN = - 11.6dBV HP VCC = 5.0V SP VCC = 5.0V DIN AUDIO
1
0.1
0.01 - 50
- 40
- 30
- 20
- 10
0
- 100 10
100
1k
10k
100k
INPUT LEVEL: VIN (dBV)
FREQUENCY: f (Hz)
Fig. 11 SP AMP input level vs. output distortion
Fig. 12 SP AMP MUTE characteristics
14
Multimedia ICs
BA7786FP-Y / BA7787FS
*Board circuit BA7786FP-Y
VCC VR1 R1 LINE IN L 27k R2 R3 C1 3 R4 LINE IN R 27k R5 R6 0.1 4 C2 BIAS 21 VR 22 23 0.1 2 VR 1 HP VCC 25 C11 24
+
HP VCC 0.1 C12 R15 100 R14 100 HP OUT L R16 15k HP GND HP OUT R HP GND C14 HP JACK
100
+
47 C10
+
47 C9 HP GND R17 15k
+
R7 33k SYSTEM BEEP IN R8 R9 0.1 C4
47
5 C3 6
0.1
20
0.1 C13
R10 BEEP LEVEL R11 27k LCH OUT R13 PM BEEP IN 18k 18k SP OUT1 L 10 17 SP OUT1 R 390k 0.1 C5 0.1 C6 9 8 SP VCC 19 C7 18 1
+
7
SP VCC 100 0.1 C8 3 2
SP OUT2 L MUTE
11
16
SP OUT2 R
12 HP SUS SP SUS LCH ON / OFF MIX ON / OFF 13
HP SUSPEND
15 SP GND
SP SUSPEND
14
HP VCC
Fig. 13
15
Multimedia ICs
BA7787FS
BA7786FP-Y / BA7787FS
VR1 R1 27k LINE IN L R2 R3 GND R4 LINE IN R 27k R5 R6 GND
+
1
HP VCC
20 C11
+100
0.1 R15 100 R14 100
HP VCC HP GND
HP JACK
0.1 2 C1 3 0.1 4 C2 47 5 BIAS 6 SP VCC VR VR
C12 47
+
19
C10
+
18
47
C9
HP OUT L HP GND HP OUT R HP GND SP VCC SP GND
HP GND 17
33k SYSTEM BEEP IN 15k 15k GND GND PM BEEP IN MUTE
R7 R8 R9 R10 R11 R12 0.1 C4 0.1 C5 0.1 C6
C3
16 + 100 C7 15
0.1 C8 R13 BEEP LEVEL 390k
7
14
SP OUT1
18k
8
13
SP OUT2 2
9 HP SUS SP SUS MIX ON / OFF
HP SUSPEND
12 3 SP GND 1
10
SP SUSPEND
11
HP VCC
Fig. 14
16
Multimedia ICs
BA7786FP-Y / BA7787FS
*Part table
BA7786FP-Y
No. R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R13 R14 R15 R16 R17 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 VR1 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 27k 27k 27k 27k 27k 27k 33k 33k 33k 390k -- 18k 100 100 15k 15k 0.1F 0.1F 47F 0.1F -- 0.1F 100F 0.1F 47F 47F 100F 0.1F 0.1F 0.1F 20k
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 33k 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.) * No need to attach. Connect pin 8 to a ground. * 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.) * The load resistor for HP OUT R. * The load resistor for HP OUT L. 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.) * The coupling capacitor for LINE IN L * The coupling capacitor for LINE IN R * The ripple rejection capacitor for the bias pin * The coupling capacitor for SYSTEM BEEP IN * No need to attach * The coupling capacitor for PM BEEP IN * The bypass capacitor for SP VCC (used for low-frequency ripple rejection) * The bypass capacitor for SP VCC (used for high-frequency ripple rejection) * The coupling capacitor for HP OUT R * The coupling capacitor for HP OUT L * The bypass capacitor for HP VCC (used for low-frequency ripple rejection) * The bypass capacitor for HP VCC (used for high-frequency ripple rejection) * The coupling capacitor for SP IN R * The coupling capacitor for SP IN L * Used to change the pin 1 DC voltage
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Multimedia ICs
BA7787FS
No. R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 Use
BA7786FP-Y / BA7787FS
Standard value 27k 27k 27k 27k 27k 27k 33k 33k 33k 15k 15k 18k 390k
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).
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 33k. * 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.) * 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.) * 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.) * The load resistor for HP OUT R. * The load resistor for HP OUT L. * The coupling capacitor for LINE IN L * The coupling capacitor for LINE IN R * The ripple rejection capacitor for the bias pin * The coupling capacitor for SYSTEM BEEP IN * The coupling capacitor for SP IN * The coupling capacitor for PM BEEP IN * The bypass capacitor for SP VCC (used for low-frequency ripple rejection) * The bypass capacitor for SP VCC (used for high-frequency ripple rejection) * The coupling capacitor for HP OUT R * The coupling capacitor for HP OUT L * The bypass capacitor for HP VCC (used for low-frequency ripple rejection) * The bypass capacitor for HP VCC (used for high-frequency ripple rejection) * Used to change the pin 1 DC voltage
R14 R15 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 VR1
100 100 0.1F 0.1F 47F 0.1F 0.1F 0.1F 100F 0.1F 47F 47F 100F 0.1F 20k
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Multimedia ICs
BA7786FP-Y / BA7787FS
*Operation notes occurring when the power is turned (1) Popping noises
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. (3) The common impedance of the two power supply lines (HP VCC and SP VCC) should be kept as low as possible.
(4) Make sure the input resistance for the SYSTEM BEEP IN pin is 33k.
33k
(5) Configure the PM BEEP IN pin of BA7786FP-Y as shown below in order to prevent oscillation in the IC.
(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
SP SP OUT1 OUT2 L L
LCH SP MIX SUS ON / ON / OFF OFF
APB-BA7786FP-Y
1 3
SP OUT2 R SP OUT1 R J9
J12
J11 2
J1
J10 J2 J3 J4 R13 R12 R11 R10 R9 R8 R7 J5 C3 C11 C4
25 1 C13 C14 LCH OUT
SP GND J8 SP VCC
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
HP SUS MUTE G PM G BEEP IN SYSTEM BEEP IN GND LINE IN R GND LINE IN L G
C6
C5
13
14
C10
C8
R17 R16 C9
J7 J6
C7
R6 R5
C2
C12
VR1
R15
R14
C1 R4
R3 R2 R1
TO HEADPHONE JACK
HP VCC HP GND HP R GND HP OUT R HP OUT L HP L GND
Fig. 15
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
20
Multimedia ICs
BA7786FP-Y / BA7787FS
*Board pattern diagram BA7786FP-Y
Fig. 16
21
Multimedia ICs
BA7786FP-Y / BA7787FS
*Board labelling diagram BA7787FS
APB-BA7787FS
SP MIX SUS ON / OFF
1 SP OUT2 SP OUT1 SP GND SP VCC J8
J1 3
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
HP SUS MUTE G PM G BEEP IN SYSTEM BEEP IN J5 GND LINE IN R GND LINE IN L R12 C6 C5 R9 R8 C3 R7 C4 R6 R5 R10 R4 R11 VR1 R3 R2 R1 J2 J3 J4 C2 C1 C11
C12
Fig. 17
2 10 1 11 20 J7 J6 TO HEADPHONE JACK C10 C8 R13 C9 R15 R14
HP VCC HP GND HP R GND HP OUT R HP OUT L HP L GND
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.)
C7
22
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 2.75 0.1 25 7.8 0.3 5.4 0.2 14 7.8 0.3 5.4 0.2 20 8.7 0.2 11
0.25 0.1
1.9 0.1
1.8 0.1
1
13 1.95 0.1
1
10
0.11
0.11
0.8
0.36 0.1
0.8
0.36 0.1
0.3Min. 0.15
0.3Min. 0.15
HSOP25
SSOP-A20
24
0.15 0.1

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