CPD
參數資料
型號： LMH6618MKX/NOPB
廠商： National Semiconductor
文件頁數： 22/38頁
文件大?。?/td> 0K
描述： IC OP AMP SGL VF RRIO TSOT23-6
標準包裝： 3,000
系列： PowerWise®
放大器類型： 電壓反饋
電路數： 1
輸出類型： 滿擺幅
轉換速率： 57 V/µs
增益帶寬積： 65MHz
-3db帶寬： 140MHz
電流 - 輸入偏壓： 1.5µA
電壓 - 輸入偏移： 100µV
電流 - 電源： 1.35mA
電流 - 輸出 / 通道： 35mA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 11 V，±1.35 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： SOT-23-6 細型，TSOT-23-6
供應商設備封裝： TSOT-23-6
包裝： 帶卷 (TR)
配用： 551600083-001-ND - BOARD FOR SOT23 LMH6611/18
其它名稱： LMH6618MKX
100k
1M
10M
100M
1G
FREQUENCY (Hz)
-18
-15
-12
-9
-6
-3
0
3
6
N
O
R
MAL
IZ
ED
I-V
G
AI
N
(d
B
)
CPD = 22 pF,
CF = 5.6 pF
CPD = 47 pF,
CF = 10 pF
CPD = 100 pF,
CF = 15 pF
CPD = 222 pF,
CF = 18 pF
SNOSAV7E – AUGUST 2007 – REVISED OCTOBER 2012
Figure 73 shows the frequency response for the various photodiodes in Table 3.
Figure 73. Frequency Response for Various Photodiode and Feedback Capacitors
When analyzing the noise at the output of the TIA, it is important to note that the various noise sources (i.e. op
amp noise voltage, feedback resistor thermal noise, input noise current, photodiode noise current) do not all
operate over the same frequency band. Therefore, when the noise at the output is calculated, this should be
taken into account. The op amp noise voltage will be gained up in the region between the noise gain’s zero and
pole (fZ and fP in Figure 72). The higher the values of RF and CT, the sooner the noise gain peaking starts and
therefore its contribution to the total output noise will be larger. It is obvious to note that it is advantageous to
minimize CIN by proper choice of op amp or by applying a reverse bias across the diode at the expense of
excess dark current and noise.
DIFFERENTIAL CABLE DRIVER FOR NTSC VIDEO
The LMH6618 and LMH6619 can be used to drive an NTSC video signal on a twisted-pair cable. Figure 74
shows the schematic of a differential cable driver for NTSC video. This circuit can be used to transmit the signal
from a camera over a twisted pair to a monitor or display located a distance. C1 and C2 are used to AC couple
the video signal into the LMH6619. The two amplifiers of the LMH6619 are set to a gain of 2 to compensate for
the 75
back termination resistors on the outputs. The LMH6618 is set to a gain of 1. Because of the DC bias
the output of the LMH6618 is AC coupled. Most monitors and displays will accept AC coupled inputs.
Copyright 2007–2012, Texas Instruments Incorporated
29
Product Folder Links: LMH6618 LMH6619
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