Electronic Components Datasheet Search |
|
INA117AM Datasheet(PDF) 6 Page - Texas Instruments |
|
|
INA117AM Datasheet(HTML) 6 Page - Texas Instruments |
6 / 17 page INA117 SBOS154A 6 APPLICATION INFORMATION Figure 1 shows the basic connections required for operation. Applications with noisy or high-impedance power-supply lines may require decoupling capacitors close to the device pins. The output voltage is equal to the differential input volt- age between pins 2 and 3. The common mode input voltage is rejected. Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R2, and the IC substrate. For specified dy- namic performance, pin 8 should be grounded or connected through a 0.1 µF capacitor to an AC ground such as V+. COMMON-MODE REJECTION Common-mode rejection (CMR) of the INA117 is depend- ent on the input resistor network, which is laser-trimmed for accurate ratio matching. To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs. A 75 Ω resistance in series with pin 2 or 3 will decrease CMR from 86dB to 72dB. Resistance in series with the reference pins will also degrade CMR. A 4 Ω resistance in series with pin 1 or 5 will decrease CMRR from 86dB to 72dB. Most applications do not require trimming. Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection. TRANSFER FUNCTION Most applications use the INA117 as a simple unity-gain difference amplifier. The transfer function is: VO = V3 – V2 V3 and V2 are the voltages at pins 3 and 2. FIGURE 1. Basic Power and Signal Connections. 380k Ω 380k Ω 380k Ω 21.1k Ω 20k Ω 47 2 3 81 5 –15V +15V 1µF Tantalum 1µF Tantalum –In = V 2 +In = V 3 V O = V3 – V2 6 R 1 R 2 R 4 R 5 R 3 380k Ω 380k Ω 380k Ω 21.1k Ω 20k Ω 47 2 3 81 5 V– V+ V 2 V 3 V O = V3 – V2 6 100k Ω 10 Ω 50k Ω ±1.5mV Range –15V +15V 380k Ω 380k Ω 380k Ω 21.1k Ω 20k Ω 47 2 3 81 5 V– V+ V 2 V 3 V = V – V O 3 2 6 10k Ω ±10mV 100 Ω 100 Ω V+ V– 100µA 1/2 REF200 100µA 1/2 REF200 OPA27 Offset adjustment is regulated— insensitive to power supply variations. (a) (b) FIGURE 2. Offset Voltage Trim Circuits. Some applications, however, apply voltages to the reference terminals (pins 1 and 5). A more complete transfer function is: VO = V3 – V2 + 19 • V5 – 18 • V1 V5 and V1 are the voltages at pins 5 and 1. |
Similar Part No. - INA117AM |
|
Similar Description - INA117AM |
|
|
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 |