VOUT = (+IN) – (–IN) + V
參數(shù)資料
型號(hào)： INA149EVM
廠商： Texas Instruments
文件頁數(shù)： 5/26頁
文件大?。?/td> 0K
描述： EVAL MODULE FOR INA149
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 1 - 單
放大器類型： 差分
轉(zhuǎn)換速率： 5 V/µs
-3db帶寬： 500kHz
電流 - 輸出 / 通道： 25mA
工作溫度： -40°C ~ 125°C
電流供應(yīng)（主 IC）： 810µA
電壓 - 電源，單路/雙路(±)： 4 V ~ 36 V，±2 V ~ 18 V
板類型： 完全填充
已供物品： 板
已用 IC / 零件： INA149
其它名稱： 296-30217
INA149EVM-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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