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Número de pieza | BA7787FS | |
Descripción | Headphone / speaker amplifier for notebook computers | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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No Preview Available ! 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
•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 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
Symbol
Power supply voltage
Power
dissipation
BA7786FP-Y
BA7787FS
Operating temperature
VCC
Pd
Topr
Storage temperature
Tstg
∗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.
Limits
6
850∗1
600∗2
– 10 ~ + 70
– 55 ~ + 125
Unit
V
mW
°C
°C
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol
Min.
Power supply voltage
VCC 4.5
Typ.
5.0
Max.
5.5
Unit
V
1
1 page Multimedia ICs
BA7786FP-Y / BA7787FS
•Electrical characteristics (unless otherwise noted, Ta = 25°C, HP VCC = SP VCC = 5.0V, f = 1kHz)
BA7786FP-Y
Parameter
Symbol Min. Typ. Max.
〈Supply current〉
Supply current
ICC 3.52 4.82 7.64
Supply current SUSPEND
ICCS 175 240 410
〈HP AMP 1〉 INPUT: LINE IN L / R, OUTPUT: HP OUT L / R
Output voltage level
VOHP – 7.4 – 4.0 – 1.5
Distortion
THDHP — 0.1 1.0
Unit
mA
µA
dBV
%
EVR variation range
GEVR
70 90 — dB
Maximum output level
VOMHP – 1.6 + 0.6
— dBV
Output residual noise
VONHP
— – 80 – 73 dBV
Interchannel crosstalk
CTHP
— – 79 – 70 dBV
Muting level
MTHP
— – 94 – 83 dBV
〈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
〈SP AMP 1〉 INPUT: SP IN L / R, OUTPUT: SP OUT L / R
Output voltage level
VOSP – 1.4 + 2.0 + 4.5 dBV
Distortion
THDSP — 0.4 1.5 %
Maximum output level
VOMSP + 3.5 + 5.7
— dBV
Output residual noise
VONSP
— – 90 – 80 dBV
Interchannel crosstalk
CTSP
— – 78 – 70 dBV
LINE MIX OFF level
VOOFFSP
— – 78 – 70 dBV
〈SP AMP 2〉 INPUT: PM BEEP IN, OUTPUT: SP OUT L / R
Output level
VOSB – 7.4 – 4.0 – 1.5 dBV
Conditions
Measurement circuit
No input, SP OUT = no load
No input, VH = VS = H
Fig.1
Fig.1
VIN = – 10.0dBV
VIN = – 10.0dBV∗1
VIN = – 10.0dBV∗2
VE = HP VCC→VE = ground level differential
THD = 1%∗1
Rg = 1kΩ∗2
VIN = – 7.0dBV∗2
VIN = – 7.0dBV∗2, VM = L
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
VIN = 5.0VP-P
Fig.1
Fig.1
VIN = – 10.0dBV
VIN = – 10.0dBV∗1
THD = 1%∗1
Rg = 1kΩ∗2
VIN = – 12.0dBV∗2
VIN = – 12.0dBV∗2, VL = L
VIN = – 10.0dBV
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
〈MUTE CTRL〉 (pin 13)
HP MUTE ON holding voltage VML GND — 0.4 V
HP MUTE OFF holding voltage VMH
4.3 — VCC V
〈HP SUSPEND〉 (pin 12)
HP SUSPEND holding voltage VHL GND — 0.4 V
HP SUSPEND holding voltage VHH
4.3 — VCC V
〈SP SUSPEND〉 (pin 13)
HP SUSPEND holding voltage VSL
GND — 0.4
V
HP SUSPEND holding voltage VSH
4.3 — VCC V
〈MONO / STEREO〉 (pin 15)
MONAURAL holding voltage
VNL GND — 0.4 V
STEREO holding voltage
VNH 4.3 — VCC V
〈LINE MIX ON / OFF〉 (pin 18)
LINE MIX OFF holding voltage VLL
GND — 0.4
V
LINE MIX ON holding voltage
VLH
4.3 — VCC V
∗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)
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
5
5 Page Multimedia ICs
•Control pins
(1) MUTE CTRL
• Turns the headphone mute function on and off.
HP MUTE ON
HP MUTE OFF
Control signal: VM
Note
L Turns off HP AMP output
H (OPEN)
—
BA7786FP-Y / BA7787FS
(2) HP SUSPEND
• Turns the headphone suspend function on and off.
HP SUSPEND
HP SUSPEND
Control signal: VH
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.
SP SUSPEND
SP SUSPEND
Control signal: VS
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.
LINE MIX OFF
LINE MIX ON
Control signal: VL
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.
SP AMP LCH OFF
SP AMP LCH ON
Control signal: VN
L
H (OPEN)
Note
SP AMP LCH turns off
SP AMP LCH operates
11
11 Page |
Páginas | Total 24 Páginas | |
PDF Descargar | [ Datasheet BA7787FS.PDF ] |
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BA7787FS | Headphone / speaker amplifier for notebook computers | ROHM Semiconductor |
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