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PDF LA74308LP Data sheet ( Hoja de datos )
| Número de pieza | LA74308LP | |
| Descripción | Monolithic Linear IC Audio Interface | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Ordering number : ENA0898
www.DataSheet4U.com
LA74308LP Monolithic Linear IC
Audio Interface for DSC
Overview
The LA74308LP is a SPEAKER AMP and MIC AMP built-in audio interface for DSC.
It incorporates an 8/16kHz trap and supports CODECs with a sampling rate of 8kHz or 16kHz.
Features
• Three-wire type SERIAL communication
• MIC AMP
• MIC power supply incorporated (with built-in pull-up resistor)
• ALC AMP
• 4th order LPF + trap (compatible with REC/PB changeover, trap frequency selectable from 8kHz and 16kHz)
• SPEAKER AMP (The BEEP signal can be mixed.), with electronic VOLUME (controlled by serial communication)
• LINE output (with SERIAL MUTE and MUTE transistor)
• STANDBY control
Specifications
Maximum Ratings at Ta=25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
Allowable power dissipation
VCC max
Pd max
Ta≤85°C *
5.0 V
500 mW
Operating temperature
Topr
-10 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
* Printed circuit board mounting condition (40mm × 50mm × 0.8mm: glass epoxy) 2S2P (Four layers printed circuit board)
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
82907 TI IM 20060927-S00005 No.A0898-1/16
1 page  
LA74308LP
POWER ON RESET Condition (SERIAL communication)
Power Supply
H
L
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STANDBY control
(Pin 3)
H
L
POWER ON PULSE
(Signal inside IC)
H
L
C.S.
(Pin 6)
Data
(Pin 8)
H
L
H
L
HIGH to cancel STANDBY
HIGH period for about 2ms
cd
(First C.S.)
Dummy communication
(Second C.S.)
First DATA communication
e
Dummy Data
f
First Data
Clock
(Pin 7)
H
L
H
POWER ON RESET
(IC inside)
L
POWER ON RESET (default) state
Delay of several
hundreds ns
g
SERIAL communication
condition
(First DATA hold)
The POWER ON RESET state covers a period up to the rise f of the second C.S. input after fall d of POWER ON
PULSE c generated inside IC when the power is supplied and the STANDBY control is canceled. e is the dummy
communication.
Actually, because of delay of several hundreds ns in the IC, the first DATA condition begins in g and the normal
SERIAL communication condition begins after g.
No.A0898-5/16
5 Page 
LA74308LP
Block Diagram
www.DataSheet4U.com
T16
T17
600Ω A SW17
MIC
IN
MIC OUT A
SW16
B
T14
SW14
B
A
∼B
6.2kΩ
0.01µF
0.1µF
ALC IN
Rg=1kΩ
∼
+
4.7µF
VCCSP
T22
3.3V
SW18
6.2kΩ
18 17
16 15 14
VREF
2.2kΩ
19 MIC VCC
+17dB
+-
R
100kΩ
P
+17dB ALC
VREF
20
+18dB
PR
REC:50kΩ/PB:200kΩ
T21
VREF
21 charging circuit
LPF
SPK8Ω
+ 0.47µF
13
DET
12
+9dB
11 +
10
PB IN
+
1µF
22
+-
23
EVR
+8dB
MUTE 10Ω
MUTE CTL
9
8
A GND
T12
REC OUT
T11
VCCA
0.1µF
T10
BA
SW10
Rg=1kΩ
∼
DATA
T23
24
+8dB
2kΩ
LOGIC
7
T7 (CLOCK)
SPK GND
12
3 456
0.1µF T2
0.1µF
22kΩ
V3 T3
STANDBY CTL
T5
LINE OUT
T6
C.S
No.A0898-11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LA74308LP.PDF ] | |
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