VOUT = (+IN) – (–IN) + V
參數(shù)資料
型號(hào)： INA149AID
廠商： Texas Instruments
文件頁數(shù)： 5/26頁
文件大小： 0K
描述： IC AMP UNITY GAIN DIFF 8SOIC
標(biāo)準(zhǔn)包裝： 75
放大器類型： 差分
電路數(shù)： 1
轉(zhuǎn)換速率： 5 V/µs
-3db帶寬： 500kHz
電壓 - 輸入偏移： 350µV
電流 - 電源： 810µA
電流 - 輸出 / 通道： 25mA
電壓 - 電源，單路/雙路(±)： 4 V ~ 36 V，±2 V ~ 18 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： 管件
其它名稱： 296-33286-5
INA149AID-ND
+
20 k
380 k
19 k
30 V
1 F
GND
4
7
2
3
1
6
5
IN
+IN
VOUT = (+IN) – (–IN) + VREF
VREF
100 nF
+
20 k
380 k
19 k
15 V
1 F
15 V
1 F
GND
4
7
2
3
1
6
5
IN
+IN
VOUT = (+IN) (IN)
100 nF
SBOS579B – SEPTEMBER 2011 – REVISED JULY 2012
APPLICATION INFORMATION
BASIC INFORMATION
Figure 43 shows the basic connections required for dual-supply operation. Applications with noisy or high-
impedance power-supply lines may require decoupling capacitors placed close to the device pins. The output
voltage is equal to the differential input voltage between pins 2 and 3. The common-mode input voltage is
rejected. Figure 44 shows the basic connections required for single-supply operation.
Figure 43. Basic Power and Signal Connections for Figure 44. Basic Power and Signal Connections for
Dual-Supply Operation
Single-Supply Operation
TRANSFER FUNCTION
Most applications use the INA149 as a simple unity-gain difference amplifier. The transfer function is given in
VOUT = (+IN) – (–IN)
(1)
Some applications, however, apply voltages to the reference terminals (REFA and REFB). The complete transfer
function is given in Equation 2:
VOUT = (+IN) – (–IN) + 20 × REFA – 19 × REFB
(2)
COMMON-MODE RANGE
The high common-mode range of the INA149 is achieved by dividing down the input signal with a high precision
resistor divider. This resistor divider brings both the positive input and the negative input within the input range of
the internal operational amplifier. This input range depends on the supply voltage of the INA149.
Both Figure 2 and Figure 3 can be used to determine the maximum common-mode range for a specific supply
voltage. The maximum common-mode range can also be calculated by ensuring that both the positive and the
negative input of the internal amplifier are within 1.5 V of the supply voltage.
In case the voltage at the inputs of the internal amplifier exceeds the supply voltage, the internal ESD diodes
start conducting current. This current must be limited to 10 mA to make sure not to exceed the absolute
maximum ratings for the device.
Copyright 2011–2012, Texas Instruments Incorporated
13
Product Folder Link(s): INA149
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參數(shù)描述
INA149AIDR 功能描述:差分放大器 High Common Mode Vltg Diff Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
INA149AMDREP 功能描述:差分放大器 EP High Common Mode Vltg Diff Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
INA149-EP 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH COMMON-MODE VOLTAGE DIFFERENCE AMPLIFIER
INA149EVM 功能描述:放大器 IC 開發(fā)工具 INA149 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
INA152 制造商:BB 制造商全稱:BB 功能描述:Single-Supply DIFFERENCE AMPLIFIER
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