|
|
PDF BL34018 Data sheet ( Hoja de datos )
| Número de pieza | BL34018 | |
| Descripción | high quality hands free speakerphone system | |
| Fabricantes | SHANGHAI BELLING | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de BL34018 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
BL34018
1. GENERAL DESCRIPTION
The BL34018 Speakerphone integrated circuit Incorporates the necessary amplifiers ，
attenuators ， and control functions to produce a high quality hands free speakerphone
system．Include are a microphone amplifier，a power audio amplifier for the speaker，transmit and
receive attenuators，a monitoring system for background sound level，and an attenuation control
system which responds to the relative transmit and receive levels as well as the background
level．Also included are all necessary regulated voltages for both internal and external circuitry，
allowing line-powered operation (no additional power supplies required)．A chip select pin allows
the chip to be powered down when not in use．A volume control function may be implemented
with an external potentiometer．BL34018 applications include speakerphones for household and
business use，intercom systems，automotive telephones，and others．
2. FEATURE
Voice switched speakerphone circuit.
All necessary level detection and attenuation controls for a hand-free telephone
included.
Background noise level monitoring with long time constant.
Background sound level compensation for transmit and receive levels as well as
the background level.
Wide operating dynamic range through signal compression.
On-chip supply and reference voltage regulation.
Power audio amplifier for typical 100mW output (into 25 ohms) with peak
limiting for speaker to minimize distortion.
Chip Select pin for active/stand by operation.
Linear Volume Control Function.
3. BLOCK DIAGRAM
http://www.belling.com.cn
-1-
Total 16 Pages
8/15/2006
Wrote by 2006
1 page  
Output Resistance (ICC = 3.0 mA)
Dropout Voltage ( V+ = 5.0 V)
VB Voltage (V+ = 7.5V)
Output Resistance ( IB = 1.7 mA)
ATTENUATORS
Receive Attenuator Gain (@1.0 kHz)
RX Mode, Pin 24 = VB;
Pin 27 = 250 mVrms
Range ( RX to TX Modes)
Idle Mode, Pin 27 = 250 mVrms
RXO Voltage ( RX Mode)
Delta RXO Voltage (Switch from RX to TX
Mode)
RXO Sink Current (RX Mode)
RXO Source Current (RX Mode)
RXI Input Impedance
Volume Control Range ( RX Attenuator Gain,
RX Mode, 0.6VB < Pin 24 < VB)
Transmit Attenuator Gain (@1.0 kHz)
TX Mode, Pin 3 = 250 mVrms
Range ( TX to RX Mode)
Idle Mode, Pin 3 = 250 mVrms
ROVCC
VCCSAT
VB
ROVB
GRX
∆GRX
GRXI
VRXO
∆VRXO
IRXOL
IRXOH
RRXI
VCR
GTX
∆GTX
GTXI
TXO Voltage ( TX Mode)
Delta TXO Voltage (Switch from TX to RX
Mode)
TXO Sink Current (TX Mode)
TXO Source Current (TX Mode)
TXI Input Impedance
ACF Voltage (VCC - Pin 25 Voltage)
RX Mode
Tx Mode
Idle Mode
SPEAKER AMPLIFIER
Speaker Amp Gain (Pin19 = 20mVrms)
VTXO
∆VTXO
ITXOL
ITXOH
RTXI
∆VACF
GSPK
SKI Input Impedance
SKO Voltage ( Pin 19 = Cap Coupled to
GND)
SKO High Voltage (Pin 19 = 0.1V, -100
mA load at Pin 15)
RSKI
VSKO
VSKOH
BL34018
-- 6.0 20
-- 80 300
21 2.5 2.9 3.3
-- 250 --
ohm
mV
Vdc
ohm
26,
27 2.0 6.0
10
dB
40 44
-20 -16
1.8 2.3
-- --
48
-12
3.2
100
dB
dB
Vdc
mV
75 --
1.0 --
3.5 5.0
24.5 --
--
3.0
8.0
32.5
uA
mA
kΩ
dB
3, 4.0 6.0
4
40 44
-16.5 -13
1.8
-- 2.3
--
75
1.0 --
3.5 --
5.0
20,
25 -- 150
-- 6.0
-- 75
8.0
48
-8.5
3.2
100
--
3.0
8.0
--
--
--
dB
dB
dB
Vdc
mV
uA
mA
kΩ
mV
mV
mV
15, 33 34
9
15 22
2.4 3.0
35
37
3.6
dB
kΩ
Vdc
5.5 --
--
Vdc
http://www.belling.com.cn
-5-
Total 16 Pages
8/15/2006
Wrote by 2006
5 Page 
BL34018
required. A logic “1” level in the range of 1.6 V to 11 V deselects the chip. The input resistance at
Pin 18 is > 75 kΩ. The VCC and VB regulated voltages go to 0.0 when the chip is deselected.
Leaving Pin 18 open is equivalent to a Logic “0” (chip enabled).
http://www.belling.com.cn
- 11 -
Total 16 Pages
8/15/2006
Wrote by 2006
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet BL34018.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| BL3401 | P-Channel High Density Trench MOSDET |  Galaxy Microelectronics |
| BL34018 | high quality hands free speakerphone system | SHANGHAI BELLING |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |