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參數(shù)資料
| 型號： | LMP8277MAX/NOPB |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 3/13頁 |
| 文件大小： | 0K |
| 描述： | IC AMP PREC VOLT DIFF 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | LMP® |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.7 V/µs |
| 增益帶寬積： | 80kHz |
| 電流 - 輸入偏壓： | 20pA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 1mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | LMP8277MAX |
VS = 4.75 to 5.5V
OUT
LMP8277
+
-
A1
GND
+IN
- IN
PROPRIETARY
LEVEL-SHIFT
CIRCUITRY
A2
GAIN = 2
A1
A2
100 k:
GAIN = 7
10:
4 to 20 mA
CURRENT LOOP
C1
VOUT = 0.8 TO 4.0V
RG = (100 k:)
GAIN (NEW)
GAIN (NEW) - 14
OBSOLETE
SNOSAK3G – DECEMBER 2004 – REVISED MARCH 2007
(10)
The inverting gain of the second amplifier is set at 2, giving a total system gain of 14. The non-inverting gain
which is achieved through positive feedback can be less than or equal to this gain without any issues. This
implies a total system gain of 28 or less is easily achievable. Once the positive gain surpasses the negative gain,
the system might oscillate.
As the value of gain resistor, RG, approaches that of the internal 100 k resistor, maintaining gain accuracy will
become more challenging. This is because Gain(new) is inversely proportional to (RG-100 k), see Equation 9 .
As RG → 100 k, the denominator of Equation 9 gets smaller. This smaller value will be comparable to the
tolerance of the 100 k
resistor and RG and hence the gain will be dominated by accuracy level of these
resistors and the gain tolerance will be determined by the tolerance of the external resistor used for RG and the
3% tolerance of the internal 100 k
resistor.
CURRENT LOOP RECEIVER
Many types of process control instrumentation use 4 to 20 mA transmitters to transmit the sensor’s analog value
to a central control room. The LMP8272 can be used as a current loop receiver as shown in Figure 25.
Figure 25. Current Loop Receiver
HIGH SIDE CURRENT SENSING
High side current measurement requires a differential amplifier with gain. Here the DC voltage source represent
a common mode voltage with the +IN input at the supply voltage and the
IN input very close to the supply
voltage. The LMP8277 can be used with a common mode voltage, VDC in this case, of up to of 16V.
The LMP8277 can be used for high side current sensing. The large common mode voltage range of this device
allows it to sense signals outside of its supply voltage range. Also, the LMP8277 has very high CMRR, which
enables it to sense very small signals in presence of larger common mode signals. The system in Figure 26
couples these two characteristics of the LMP8277 in an automotive application. The signal through RS1 is
detected and amplified by LMP8277 in the presence of a common mode signal of up to 16V with highest
accuracy.
Copyright 2004–2007, Texas Instruments Incorporated
11
Product Folder Links: LMP8277
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| LMP8278MMEVAL/NOPB | 制造商:Texas Instruments 功能描述:HIGH COMMON MODE, 14 X GAIN, PRECISION C - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:BOARD EVAL FOR LMP8278 制造商:Texas Instruments 功能描述:High Common Mode, 14 x Gain, Precision C |
| LMP8278Q | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Common Mode, 14 x Gain, Precision Current Sensing Amplifier |
| LMP8278QMM/NOPB | 功能描述:電流靈敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| LMP8278QMME/NOPB | 功能描述:電流靈敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| LMP8278QMMX/NOPB | 功能描述:電流靈敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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