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PDF BL34118 Data sheet ( Hoja de datos )
| Número de pieza | BL34118 | |
| Descripción | Voice Switched Speakerphone Circuit | |
| Fabricantes | SHANGHAI BELLING | |
| Logotipo |  |
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BL34118
Voice Switched Speakerphone Circuit BL34118
The BL34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers,
attenuators, level detectors, and control algorithm to form the heart of a high quality hands-free
speakerphone system. Included are a microphone amplifier with adjustable gain and MUTE control,
Transmit and Receive attenuators which operate in a complementary manner, level detectors at both
input and output of both attenuators, and background noise monitors for both the transmit and receive
channels. A Dial Tone Detector prevents the dial tone from being attenuated by the Receive background
noise monitor circuit. Also included are two line driver amplifiers, which can be used to form a hybrid
network in conjunction with an external coupling transformer. A high-pass filter can be used to filter out
60Hz noise in the receive channel, or for other functions. A chip Disable pin permits powering down the
entire circuit to conserve power on long loops where loop current is at a minimum.
The BL34118 may be operated from a power supply, or it can be powered from the telephone line,
requiring typically 5.0 mA. The BL34118 can be interfaced directly to Tip and Ring (through a coupling
transformer) for stand-alone operation, or it can be used in conjunction with a handset speech network
and/or other features of a feature phone.
Improved Attenuator Gain Range: 52 dB Between Transmit and Receive
Low Voltage Operation for Line-Powered Applications (3.0 – 6.5V)
4-Point Signal Sensing for Improved Sensitivity
Background Noise Monitors for Both Transmit and Receive Paths
Microphone Amplifier Gain Set by External Resistors – Mute Function Included
Chip Disable for Active/Standby Operation
On Board Filter Pinned-Out for User Defined Function
Dial Tone Detector to Inhibit Receive Idle Mode During Dial Tone Presence
Standard 28-Pin Plastic DIP Package and SOIC Package Available
Compatible with BL34119 Speaker Amplifier
PIN CONNECTIONS( Top View )
FO
FI
CD
Vcc
HTO+
HTO-
HTI
TXO
TXI
MCO
MCI
MUT
VLC
CT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
http://www.belling.com.cn
GND
CPR
RLI1
RLO1
TLO1
TLI1
RXO
RXI
RLI2
RLO2
TLO2
TLI2
CPT
VB
-1-
Total 11 Pages
8/15/2006
Wrote by 2006
1 page  
ATTENUATOR CONTROL (TA = +25°C)
CT Voltage ( Pin 14 – VB)
Rx Mode (VLC = VB)
Idle Mode
Tx Mode
CT Source Current (switching to Rx mode)
CT Sink Current (switching to Tx mode)
CT Slow Idle Current
CT Fast Idle Internal Resistance
VLC Input Current
Dial Tone Detector Threshold
BL34118
VCT
ICTR
ICTT
ICTS
RFI
IVLC
VDT
- +240 -
-0-
- -240 -
-85 -60 -40
+40 +60 +85
-0-
1.5 2.0 3.6
- -60 -
10 15 20
mV
µA
µA
µA
kΩ
nA
mV
MICROPHONE AMPLIFIER (TA = +25°C, VMUT ≤ 0.8V, AVCL = 31 dB unless otherwise noted)
Output Offset (VMCO – VB, Feedback R = 180 kΩ)
MCOVOS -50 0 +50
Open Loop Gain (f < 100 Hz)
AVOLM 70 80
-
Gain Bandwidth
GBWM - 1.0 -
Output High Voltage (Iout = -1.0mA, Vcc = 5.0V)
VMCOH
3.7
-
-
Output Low Voltage (Iout = +1.0mA)
VMCOL
-
- 200
Input Bias Current (@ MCI)
IBM - -40 -
Muting (∆Gain) (f = 1.0KHz, VMUT = 2.0 V)
GMT -55 -
-
(300 Hz < f < 10 kHz)
- -68 -
MUT Input Resistance ( Vcc = VMUT = 6.5V)
RMUT
50 90
-
MUT Input – High
VMUTH
2.0
-
Vcc
MUT Input – Low
VMUTL
0
- 0.8
Distortion ( 300 Hz < f < 10 kHz)
THDM
- 0.15 -
mVdc
dB
MHz
Vdc
mVdc
nA
dB
kΩ
Vdc
Vdc
%
HYBRID AMPLIFIER (TA = +25°C)
HTO- Offset (VHTO- - VB, Feedback R = 51 kΩ)
HTO- to HTO+ Offset (Feedback R = 51 kΩ)
Open Loop Gain ( HTI to HTO-, f < 100 Hz)
Gain Bandwidth
Closed Loop Gain ( HTO- to HTO+)
Input Bias Current ( @ HTI)
HTO- High Voltage ( Iout = -5.0 mA)
HTO- Low Voltage ( Iout = +5.0 mA)
HTO+ High Voltage ( Iout = -5.0 mA)
HTO+ Low Voltage ( Iout = +5.0 mA)
Distortion ( 300 Hz < f < 10 kHz, See Figure 1)
HVOS
HBVOS
AVOLH
GBWH
AVCLH
IBH
VHT-H
VHT-L
VHT+H
VTH+L
THDH
-20
-30
60
-
-0.35
-
3.7
-
3.7
-
-
0 +20 mVdc
0 +30 mVdc
80 - dB
1.0 - MHz
0 +0.35 dB
-30 - nA
- - Vdc
- 250 mVdc
- - Vdc
- 450 mVdc
0.3 -
%
http://www.belling.com.cn
-5-
Total 11 Pages
8/15/2006
Wrote by 2006
5 Page 
Unit: inches (mm)
SOP 28
BL34118
http://www.belling.com.cn
- 11 -
Total 11 Pages
8/15/2006
Wrote by 2006
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet BL34118.PDF ] | |
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