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MH89791 PDF预览

MH89791

更新时间: 2024-01-20 21:40:34
品牌 Logo 应用领域
MITEL PC
页数 文件大小 规格书
4页 123K
描述
CEPT PCM 30 Transmit Equalizer Advance Information

MH89791 技术参数

生命周期:Obsolete零件包装代码:MODULE
包装说明:,针数:20
Reach Compliance Code:unknownHTS代码:8542.39.00.01
风险等级:5.83JESD-30 代码:R-XSMA-T20
功能数量:1端子数量:20
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:UNSPECIFIED封装形状:RECTANGULAR
封装形式:MICROELECTRONIC ASSEMBLY认证状态:Not Qualified
表面贴装:NO电信集成电路类型:LINE EQUALIZER
温度等级:INDUSTRIAL端子形式:THROUGH-HOLE
端子位置:SINGLEBase Number Matches:1

MH89791 数据手册

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MH89791  
CEPT PCM 30 Transmit Equalizer  
Advance Information  
ISSUE 4  
May 1995  
Features  
Pin Connections  
Used with the MH89790B  
1
2
3
4
5
6
7
TL  
TL  
TI  
Ri  
RL  
RL  
TxT  
EIT  
Programmable equalization for different line  
lengths  
6dB loop around circuit  
8
9
Description  
EA  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
L1  
EB  
EC  
L2  
The MH89791 is a programmable network for use  
with a PCM 30 line interface, specifically the  
MH89790B on The ISDN EXPRESS™ Card. The  
MH89791 contains transmit equalizer and a 6 dB  
pad, for external loop around, with 120input and  
output impedances. It is fabricated in thick film  
hybrid technology and is 2 inches high by 0.5 inches  
wide. The MH89791 is designed to interface to 22  
gauge/.6 mm twisted pair. Figure 1 shows how the  
MH89791 is connected to the transmit side of a PCM  
RCHT  
RCLT  
TxR  
EIR  
SW  
RCHR  
RCLR  
Ordering Information -40°C to 85°C  
MH89791 20 Pin SIP Hybrid  
30 interface.  
The seven switches control the  
distance settings of the equalizer. Ti, Ri, TL, and RL  
are the inputs and outputs of the 6 dB pad. The 4  
pole double throw relay connected to the transformer  
inputs and outputs shows how the transmit signal is  
switched between the equalizer for normal operation,  
and the 6dB pad for loop around. Figure 2 shows the  
circuit description of the MH89791 while Figure 3  
shows the switch settings for the Tx equalizer.  
MH89790B  
MH89791  
EIT  
EIR  
TxT  
TxR  
OUTA  
• •  
+12V  
L1  
1:  
1:  
:0.5  
S1  
S2  
S3  
C2  
EA  
EB  
EC  
C2 = .47µF  
L1 = 33 µH  
OUTB  
SW  
RCLT  
S4  
S5  
RCHT  
RCLR  
S6  
S7  
RCHR  
Ti  
TL  
Ri  
RL  
RxT  
RxR  
.8:  
.8:  
:1  
Figure 1 - Connection Diagram  
4-219  

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