參數(shù)資料
型號: LMH6618MKE/NOPB
廠商: National Semiconductor
文件頁數(shù): 19/38頁
文件大?。?/td> 0K
描述: IC OP AMP SGL VF RRIO TSOT23-6
標準包裝: 250
系列: PowerWise®
放大器類型: 電壓反饋
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)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(yīng)商設(shè)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: LMH6618MKE
LMH6618MKE-ND
LMH6618MKE/NOPBTR
0.1 PF
1 PF
0.1 PF
1 PF
820 pF
1.02 k:
62 pF
1.02 k:
V
+
-
+
V
-
510:
OUTPUT
0.1 PF
1 PF
0.1 PF
1 PF
330 pF
1.05 k:
150 pF
V
+
-
+
523:
V
-
INPUT
1.05 k:
LMH6619
+
-
VIN
R1
RG
RF
VOUT
LMH6618
R2
V
+
V
+
SNOSAV7E – AUGUST 2007 – REVISED OCTOBER 2012
4. VOUTMID = 2V + (4V – 2V)/2 = 3V
5. Gain = (4V – 2V)/(1V – 0V) = 2
6.
ΔVOUT = 3V – 2 x 0.5V = 2
7. For the example the supply voltage will be +5V.
8. Noise gain = 2 + 2/5V = 2.4
9. RF = 2 k
10. R1 = 2 k/2 = 1 k
11. R2 = 2 k/(2.4-2) = 5 k
12. RG = 2 k/(2.4 – 1) = 1.43 k
Figure 68. DC Level Shifting
4th ORDER MULTIPLE FEEDBACK LOW-PASS FILTER
Figure 69 shows the LMH6619 used as the amplifier in a multiple feedback low pass filter. This filter is set up to
have a gain of +1 and a
3 dB point of 1 MHz. Values can be determined by using the WEBENCH Active Filter
Designer found at webench.ti.com.
Figure 69. 4th Order Multiple Feedback Low-Pass Filter
CURRENT SENSE AMPLIFIER
With it’s rail-to-rail input and output capability, low VOS, and low IB the LMH6618 is an ideal choice for a current
sense amplifier application. Figure 70 shows the schematic of the LMH6618 set up in a low-side sense
configuration which provides a conversion gain of 2V/A. Voltage error due to VOS can be calculated to be VOS x
(1 + RF/RG) or 0.75 mV x 20.6 = 15.5 mV. Voltage error due to IO is IO x RF or 0.26 A x 1 k = 0.26 mV. Hence
total voltage error is 15.5 mV + 0.26 mV or 15.7 mV which translates into a current error of 15.7 mV/(2 V/A) = 7.9
mA.
26
Copyright 2007–2012, Texas Instruments Incorporated
Product Folder Links: LMH6618 LMH6619
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