A

1

A

2

A

3

7

50kW

50kW

50kW

50kW

8

5

4

3

2

1

-IN

+IN

R

G

V+

V-

Device

G=1+

49.4kW

R

G

6

RFIFilter

24.7kW

24.7kW

RFIFilter

Load

V =G

(V

´

V

-

)

O

IN+

IN-

0.1 F

m

0.1 F

m

+

-

V

O

R

G

Alsodrawninsimplifiedform:

Device

REF

V

O

-IN

+IN

REF

R

(1)

S

R

(1)

S

INA826

www.ti.com

SBOS562B

– AUGUST 2011 – REVISED DECEMBER 2011

APPLICATION INFORMATION

Figure 58 shows the basic connections required for operation of the INA826. Good layout practice mandates the

use of bypass capacitors placed as close to the device pins as possible.

The output of the INA826 is referred to the output reference (REF) terminal, which is normally grounded. This

connection must be low-impedance to assure good common-mode rejection. Although 5

Ω or less of stray

resistance can be tolerated while maintaining specified CMRR, small stray resistances of tens of ohms in series

with the REF pin can cause noticeable degradation in CMRR.

(1) This resistor is optional if the input voltage stays above [(V

–) – 2 V] or the signal source current drive capability is limited to less than 3.5

mA. See the Input Protection section for more details.

Figure 58. Basic Connections

Copyright

© 2011, Texas Instruments Incorporated

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Product Folder Link(s): INA826