 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
INA126EA Datasheet(PDF) 7 Page - Burr-Brown (TI) |
|
|
||||||||||||||||||||||||||||||
INA126EA Datasheet(HTML) 7 Page - Burr-Brown (TI) |
|
|
7 / 19 page  INA126, INA2126 7 SBOS062A www.ti.com APPLICATION INFORMATION Figure 1 shows the basic connections required for operation of the INA126. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. The output is referred to the output reference (Ref) terminal which is normally grounded. This must be a low-impedance connection to ensure good common-mode rejection. A resis- tance of 8 Ω in series with the Ref pin will cause a typical device to degrade to approximately 80dB CMR. Dual versions (INA2126) have feedback sense connections, SenseA and SenseB. These must be connected to their respec- tive output terminals for proper operation. The sense con- nection can be used to sense the output voltage directly at the load for best accuracy. SETTING THE GAIN Gain is set by connecting an external resistor, RG, as shown: (1) Commonly used gains and RG resistor values are shown in Figure 1. The 80k Ω term in equation 1 comes from the internal metal film resistors which are laser trimmed to accurate absolute values. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications. The stability and temperature drift of the external gain setting resistor, RG, also affects gain. RG’s contribution to gain accuracy and drift can be directly inferred from the gain equation (1). Low resistor values required for high gain can make wiring resistance important. Sockets add to the wiring resistance, which will contribute additional gain error in gains of approximately 100 or greater. OFFSET TRIMMING The INA126 and INA2126 are laser trimmed for low offset voltage and offset voltage drift. Most applications require no external offset adjustment. Figure 2 shows an optional cir- cuit for trimming the output offset voltage. The voltage applied to the Ref terminal is added to the output signal. An op amp buffer is used to provide low impedance at the Ref terminal to preserve good common-mode rejection. FIGURE 1. Basic Connections. DESIRED GAIN RG NEAREST 1% (V/V) ( Ω)R G VALUE 5NC NC 10 16k 15.8k 20 5333 5360 50 1779 1780 100 842 845 200 410 412 500 162 162 1000 80.4 80.6 2000 40.1 40.2 5000 16.0 15.8 10000 8.0 7.87 NC: No Connection. G =5 + 80 k Ω R G FIGURE 2. Optional Trimming of Output Offset Voltage. 10k Ω OPA237 ±10mV Adjustment Range 100 Ω 100 Ω 100µA 1/2 REF200 100µA 1/2 REF200 V+ V– R G INA126 Ref V O ✻ V IN – V IN + ✻ Dual version has external sense connection. 40k Ω 10k Ω 10k Ω 40k Ω INA126 5 4 2 1 8 3 7 6 R G R G V IN A 2 A 1 – V IN + V IN – V IN + V+ V– INA126 0.1 µF 0.1 µF V O V O Ref ✻ Ref Load + – Also drawn in simplified form: V O = (VIN – VIN) G – + G = 5 + ✻ Pin numbers are for single version ✻ Dual version has external sense connection. 80k Ω R G |
Similar Part No. - INA126EA |
|
Similar Description - INA126EA |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
