參數(shù)資料
型號(hào)： SN75LVDS32DG4
廠商： TEXAS INSTRUMENTS INC
元件分類： Buffer和線驅(qū)動(dòng)
英文描述： QUAD LINE RECEIVER, PDSO16
封裝： GREEN, PLASTIC, SOIC-16
文件頁(yè)數(shù)： 2/18頁(yè)
文件大?。?/td> 381K
代理商： SN75LVDS32DG4
SN75LVDS32, SN75LVDS9637
HIGH-SPEED DIFFERENTIAL LINE RECEIVERS
SLLS360B – JUNE 1999 – REVISED JUNE 2001
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
using an LVDS receiver with RS-422 data
Receipt of data from a TIA/EIA-422 line driver may be accomplished using a TIA/EIA-644 line receiver with the
addition of an attenuator circuit. This technique gives the user a very high-speed and low-power 422 receiver.
If the ground noise between the transmitter and receiver is not a concern (less than
±1 V), the answer can be
as simple as shown below in Figure 5. The use of a resistor divider circuit in front of the LVDS receiver attenuates
the 422 differential signal to LVDS levels.
The resistors present a total differential load of 100
to match the characteristic impedance of the transmission
line and to reduce the signal 10:1. The maximum 422 differential output signal or 6 V is reduced to 600 mV. The
high input impedance of the LVDS receiver prevents input bias offsets and maintains a better than 200-mV
differential input voltage threshold at the inputs to the divider. This circuit is used in front of each LVDS channel
that also receives 422 signals.
R1
45.3
R2
45.3
R3
5.11
R4
5.11
A
B
Y
’LVDS32
NOTE A: The components used were standard values.
R1, R2 = NRC12F45R3TR, NIC Components, 45.3 Ohm, 1/8W, 1%, 1206 Package
R3, R4 = NRC12F5R11TR, NIC Components, 5.11 Ohm, 1/8W, 1%, 1206 Package
The resistor values do not need to be 1% tolerance. However, it can be difficult locating a supplier of resistors having values less than
100
in stock and readily available. The user may find other suppliers with comparable parts having tolerances of 5% or even 10%.
These parts are adequate for use in this circuit.
Figure 5. RS-422 Data Input to an LVDS Receiver Under Low Ground Noise Conditions
If ground noise between the RS-422 driver and LVDS receiver is a concern, then the common-mode voltage
must be attenuated. The circuit must then be modified to connect the node between R3 and R4 to the LVDS
receiver ground. This modification to the circuit increases the common-mode voltage from
±1 V to greater than
±4.5 V.
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SN75LVDS32PWR 功能描述:IC QUAD DIFF RECEIVR HS 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND
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