SBOS392H August 2007 – August 2019 REF3312 , REF3318 , REF3320 , REF3325 , REF3330 , REF3333
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Device Comparison
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Parameter Measurement Information
- 9 Detailed Description
-
10Applications and Implementation
- 10.1 Application Information
- 10.2
Typical Applications
- 10.2.1
REF3312 in a Bipolar Signal-Chain Configuration
- 10.2.1.1 Design Requirements
- 10.2.1.2 Detailed Design Procedure
- 10.2.1.3 Application Curves
- 10.2.1
REF3312 in a Bipolar Signal-Chain Configuration
- 11Power-Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
10.2.1.2.2 Differential Input Attenuator Design
VDIFF is the difference between the two inputs, as shown in Equation 8:
Equation 8. 
When the ratio of R3 and R2 equals the ratio of R7 and R6, Equation 8 simplifies to Equation 10.
That is, if:
Equation 9. 
Then:
Equation 10. 
Determine the ratio of R1, R2, and R3 by setting A1+ equal to the maximum VDIFF for a full-scale positive or negative input voltage, VIN_MAX, as shown in Equation 11:
Equation 11. 
R2 equals R3; therefore, Equation 11 simplifies to R2 / 2, resulting in Equation 12:
Equation 12. 