Electronic Components Datasheet Search |
|
INA111AP Datasheet(PDF) 9 Page - Burr-Brown (TI) |
|
|
INA111AP Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 14 page ® INA111 9 A combination of common-mode and differential input voltage can cause the output of A1 or A2 to saturate. Figure 4 shows the output voltage swing of A1 and A2 expressed in terms of a common-mode and differential input voltages. For applications where input common-mode range must be maximized, limit the output voltage swing by connecting the INA111 in a lower gain (see performance curve “Input Common-Mode Voltage Range vs Output Voltage”). If necessary, add gain after the INA111 to increase the voltage swing. Input-overload often produces an output voltage that appears normal. For example, consider an input voltage of +14V on one input and +15V on the other input will obviously exceed the linear common-mode range of both input amplifiers. Since both input amplifiers are saturated to the nearly the same output voltage limit, the difference voltage measured by the output amplifier will be near zero. The output of the INA111 will be near 0V even though both inputs are overloaded. INPUT PROTECTION Inputs of the INA111 are protected for input voltages from 0.7V below the negative supply to 15V above the positive power supply voltages. If the input current is limited to less than 1mA, clamp diodes are not required; internal junctions will clamp the input voltage to safe levels. If the input source can supply more than 1mA, use external clamp diodes as shown in Figure 5. The source current can be limited with series resistors R1 and R2 as shown. Resistor values greater than 10k Ω will contribute noise to the circuit. A diode formed with a 2N4117A transistor as shown in Figure 5 assures low leakage. Common signal diodes such as the 1N4148 may have leakage currents far greater than the input bias current of the INA111 and are usually sensitive to light. INPUT FILTERING The INA111’s FET input allows use of an R/C input filter without creating large offsets due to input bias current. Figure 6 shows proper implementation of this input filter to preserve the INA111’s excellent high frequency common- mode rejection. Mismatch of the common-mode input ca- pacitance (C1 and C2), either from stray capacitance or FIGURE 5. Input Protection Voltage Clamp. FIGURE 4. Voltage Swing of A 1 and A2. INA111 V O V+ V+ V IN – V IN + D 1 D 3 D 2 D 4 Diodes: = 2N4117A 1pA Leakage R G R 1 R 2 A 1 A 2 A 3 10k Ω 10k Ω 10k Ω 10k Ω R G V+ V– INA111 V O = G • VD G = 1 + 50k Ω R G 25k Ω 25k Ω V CM – G • V D 2 V D 2 V D 2 V CM V CM + G • V D 2 |
Similar Part No. - INA111AP |
|
Similar Description - INA111AP |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |