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參數(shù)資料
| 型號(hào)： | BL34118 |
| 廠商： | 上海貝嶺股份有限公司 |
| 英文描述： | Voice Switched Speakerphone Circuit |
| 中文描述： | 語音開關(guān)揚(yáng)聲器電路 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 567K |
| 代理商： | BL34118 |
BL34118
http://www.belling.com.cn
- 1 -
8/15/2006
Total
11 Pages
Wrote by 2006
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 )
HTO-
TLI1
6
23
FO
FI
CD
Vcc
HTO+
HTI
TXO
TXI
MCO
MCI
MUT
VLC
CT
GND
CPR
RLI1
RLO1
TLO1
RXO
RXI
RLI2
RLO2
TLO2
TLI2
CPT
VB
1
2
3
4
5
7
8
9
10
11
12
13
14
28
27
26
25
24
22
21
20
19
18
17
16
15
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