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HT9032C-16SOP-A

更新时间： 2022-01-18 22:42:00
品牌 Logo 应用领域
其他 - ETC 电信
页数 文件大小 规格书
8页 145K
描述
Telecommunication IC

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中文翻译

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HT9032C-16SOP-A 数据手册

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HT9032  
Functional Description  
·
·
The HT9032 is designed to be the physical layer de-  
modulator for products targeted for the caller ID market.  
The data signaling interface should conform to Bell 202,  
which is described as follows:  
Logical 0 (Space)=2100Hz  
Transmission rate=1200bps  
Since the band pass filter of the HT9032 can pass the  
V.23 signal, hence the HT9032 also can demodulate the  
V.23 signal.  
·
·
·
·
·
Analog, phase coherent, frequency shift keying  
Logical 1 (Mark)=1200+/-12Hz  
Ring detection  
Logical 0 (Space)=2200+/-22Hz  
The data will be transmitted in the silent period between  
the first and second power ring before a voice path is es-  
tablished. The HT9032 should first detect a valid ring  
and then perform the FSK demodulation. The typical  
ring detection circuit of the HT9032 is depicted below.  
The power ring signal is first rectified through a bridge  
circuit and then sent to a resistor network that attenu-  
ates the incoming power ring. The values of resistors  
and capacitor given in the figure have been chosen to  
provide a sufficient voltage at RDET1 pin to turn on the  
Schmitt trigger input with approximately a 40 Vrms or  
greater power ring input from tip and ring. When VT+ of  
the Schmitt is exceeded, the NMOS on the pin RTIME  
will be driven to saturation discharging capacitor on  
RTIME. This will initialize a partial power up, with only  
the portions of the part involved with the ring signal anal-  
ysis enabled, including RDET2 pin. With RDET2 pin en-  
abled, a portion of the power ring above 1.2V is fed to  
the ring analysis circuit. Once the ring signal is qualified,  
the RDET pin will be sent low.  
Transmission rate=1200bps  
Data application=serial, binary, asynchronous  
The interface should be arranged to allow simple data  
transmission from the terminating central office, to the  
CPE (Customer Premises Equipment), only when the  
CPE is in an on-hook state. The data will be transmitted  
in the silent period between the first and second power  
ring before a voice path is established. The transmission  
level from the terminating C.O. will be -13.5dBm+/-1.0.  
The worst case attenuation through the loop is expected  
to be -20dB. The receiver therefore, should have a sen-  
sitivity of approximately -34.5dBm to handle the worst  
case installations. The ITU-T V.23 is also using the FSK  
signaling scheme to transmit data in the general  
switched telephone network. For mode 2 of the V.23, the  
modulation rate and characteristic frequencies are listed  
below:  
·
Analog, phase coherent, frequency shift keying  
·
Logical 1 (Mark)=1300Hz  
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Operation mode  
There are three operation modes of the HT9032. They are power down mode, partial power up mode, and power up  
mode. The three modes are classified by the following conditions:  
Modes  
Conditions  
PDWN=²1² and RTIME=²1²  
PDWN=²1² and RTIME=²0²  
PDWN=²0²  
Current Consumption  
Power down  
<1mA  
Partial power up  
Power up  
1.9mA typically  
3.2mA typically  
Rev. 1.30  
5
November 19, 2001  
12345678

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