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BL34018 の電気的特性と機能

BL34018のメーカーはSHANGHAI BELLINGです、この部品の機能は「high quality hands free speakerphone system」です。


製品の詳細 ( Datasheet PDF )

部品番号 BL34018
部品説明 high quality hands free speakerphone system
メーカ SHANGHAI BELLING
ロゴ SHANGHAI BELLING ロゴ 




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BL34018 Datasheet, BL34018 PDF,ピン配置, 機能
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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
systemInclude are a microphone amplifiera power audio amplifier for the speakertransmit and
receive attenuatorsa monitoring system for background sound leveland an attenuation control
system which responds to the relative transmit and receive levels as well as the background
levelAlso 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 useA volume control function may be implemented
with an external potentiometerBL34018 applications include speakerphones for household and
business useintercom systemsautomotive telephonesand 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
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BL34018 pdf, ピン配列
BL34018
additionally controls the attack and decay time of this circuit. The gain control loop limits
the speaker amp input to prevent clipping at SKO. The internal resistance at the AGC pin
is nominally 110 k ohms.
18 Digital chip select input. When at a logic “0” (<0.7 V) the VCC regulator is enabled.
CS When at a logic “1” (>1.6 V), the chip is in the standby mode drawing 0.5 mA. An open
CS pin is a logic “0”. Input impedance is nominally 140 k ohms. The input voltage
should not exceed 11 V.
19 SKI Input to the speaker amplifier. Input impedance is normally 20 k ohms.
20 VCC A 5.4 V regulated output which powers all circuits except the speaker amplifier output
stage. VCC can be used to power external circuitry such as a microprocessor( 3.0 mA
max). A filter capacitor is required. The BL34018 can be powered by a separate regulated
supply by connecting V+ and VCC to a voltage between 4.5 V and 6.5 V while
maintaining CS at a logic “1”.
21 VB
An output voltage equal to approximately VCC/2 which serves as an analog ground for
the speakerphone system. Up to 1.5 mA of external load current may be sourced from VB.
Output impedance is 250 ohms. A filter capacitor is required.
Gnd Ground pin for the IC (except the speaker amplifier).
22
23 XDC Transmit detector output. A resistor and capacitor at this pin hold the system in the
transmit mode during pauses between words and phrases. When the XDC pin voltage
decays to ground the attenuators switch from the transmit mode to the idle mode. The
internal resistor at XDC is nominally 2.6 k ohms.
24 VLC Volume control input. Connecting this pin to the slider of a variable resistor provides
receive mode volume control. The VLC pin voltage should be less than or equal to VB.
25 ACF Attenuator control filter. A capacitor connected to this pin reduces noise transients as the
attenuator control switches levels of attenuation.
26 RXO Output of the receive attenuator. Normally this pin is ac coupled to the input of the
speaker amplifier.
27 RXI Input of the receive attenuator. Input impedance is nominally 5.0 k ohms.
28 RRX A resistor to ground determines the nominal gain of the receive attenuator. The receive
channel gain is directly proportional to the RRX resistance.
http://www.belling.com.cn
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Total 16 Pages
8/15/2006
Wrote by 2006


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BL34018 電子部品, 半導体
SKO Low Voltage ( Pin 19 = -0.1V, +100 mA
load at Pin 15)
MICROPHONE AMPLIFIER
Mike Amp Gain (Pin 9 = 10mVrms , 1.0 kHz)
VSKOL
GMCI
Mike Amp Input Resistance
LOGAMPS
RMCI
RLO Leakage Current (Pin 8 = VB + 1.0V)
TLO Leakage Current (Pin 6 = VB + 1.0V)
Transmit -Receive Switching Threshold
( Ratio of ITLI to IRLI - at 20 uA - to switch
TX-RX Comparator)
TRANSMIT DETECTOR
XDC Voltage -- Idle Mode
-- TX Mode
CP2 Current Source
DISTORTION
ILKRLO
ILKTLO
ITH
VXDC
ICP2
RX Mode – RXI to SKO
(Pin 27 = 10mVrms ,1.0kHz)
TX Mode – MCI to TXO
(Pin 9 = 5.0mVrms ,1.0kHz)
RXD
TXD
NOTES: 1. V+ = 7.5V, CS = 0.7V except where noted.
BL34018
-- -- 600
9, 32.5 34
10
6.5 10
35
16
8 --
6 --
5,7 0.8
25
--
--
--
2.0
2.0
1.2
23 -- 0
-- 4.0
12 5.0 10
--
--
13
27, -- 1.5
15
4,9 -- 2.0
--
--
2. RX Mode : Pin 7 = -100 uA, Pin 5 = +100 uA, except where noted.
TX Mode : Pin 5,13 = -100 uA, Pin 7 = +100 uA, Pin 11 = 0V.
Idle Mode: Pin 5 = -100 uA, Pin 7, 13 = +100 uA.
3. Current into a pin designated as +; current out of a pin designated as - .
4. Voltages referred to Pin 22. TA = +25°C.
mV
dB
k
uA
uA
Vdc
Vdc
uA
%
%
TEMPERATURE CHARACTERISTICS (-20 to 60°C)
Parameter
V+ Supply Current (V+ = 11V, Pin 18 = 0.7V)
V+ Supply Current (V+ = 11V, Pin 18 = 1.6V)
VCC Voltage ( V+ = 7.5V)
Attenuator Gain ( Max and Min Settings)
Pin
Typical
Units
Change
16 -0.2 %/°C
16 -0.4 %/°C
20 +0.1 %/°C
±0.003
dB/°c
http://www.belling.com.cn
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Total 16 Pages
8/15/2006
Wrote by 2006

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high quality hands free speakerphone system

SHANGHAI BELLING
SHANGHAI BELLING


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