參數(shù)資料
型號: LMH6734MQX/NOPB
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 音頻/視頻放大
英文描述: 3 CHANNEL, VIDEO AMPLIFIER, PDSO16
封裝: ROHS COMPLIANT, SSOP-16
文件頁數(shù): 6/18頁
文件大?。?/td> 561K
代理商: LMH6734MQX/NOPB
30003637
FIGURE 10. Frequency Response for Circuit in Figure 9 (Standard Circuit Figure 5)
COMPONENT DRIVER
The LMH6734 is capable of transmitting and receiving com-
ponent video over short to moderate unshielded twisted-pair
(UTP) CAT5 cables, as shown in Figure 11. The component
signals Y, Pb, and Pr are connected to the LMH6734 transmit
side inputs with a 75
termination. The LMH6734 transmit
amplifiers are configured for a gain of +2 V/V before driving
the CAT5 cable. Only three out of the four pairs in the stan-
dard CAT5 are utilized, the fourth pair is available for audio.
The output of the LMH6734 transmit ampliers drive a 50
transmission system with one side of the twisted pair termi-
nated 50
to ground. Note this system, without signal equal-
ization, will satisfy transmission up to 200 ft. For longer cable
lengths, frequency and gain equalization to compensate for
signal degradation is recommended.
The LMH6734 receive side is configured for a unity gain buffer
for the component signals received through the CAT5 cable.
The inputs of the receiver channels are 100
differentially
terminated. The two 327
external resisters were chosen to
match the internal R
F and RG value of 327. Figure 12, shows
the LMH6734 transceiver frequency response over various
lengths of CAT5 cable with a 1 V
PP input signal at ±5 supply
voltage. The CMRR of the LMH6734 receive side at low fre-
quencies is 55dB at best with a split power supply of ±5V.
30003665
FIGURE 11. Component Video Transmission Over UTP (CAT5)
www.national.com
14
LMH6734
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