SLPS755B October   2023  – October 2025 RES11A-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 DC Measurement Configurations
    2. 6.2 AC Measurement Configurations
    3. 6.3 Error Notation and Units
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Ratiometric Matching for Low Gain Error
        1. 7.3.1.1 Absolute and Ratiometric Tolerances
      2. 7.3.2 Ratiometric Drift
        1. 7.3.2.1 Long-Term Stability
      3. 7.3.3 Predictable Voltage Coefficient
      4. 7.3.4 Ultra-Low Noise
    4. 7.4 Device Functional Modes
      1. 7.4.1 Per-Resistor Limitations
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Amplifier Feedback Circuit
        1. 8.1.1.1 Amplifier Feedback Circuit Example
      2. 8.1.2 Voltage Divider Circuit
        1. 8.1.2.1 Voltage Divider Circuit Example
        2. 8.1.2.2 Voltage-Divider Circuit Drift
      3. 8.1.3 Discrete Difference Amplifier
        1. 8.1.3.1 Difference-Amplifier Common-Mode Rejection Analysis
        2. 8.1.3.2 Difference-Amplifier Gain Error Analysis
      4. 8.1.4 Discrete Instrumentation Amplifiers
      5. 8.1.5 Fully Differential Amplifier
      6. 8.1.6 Unconventional Circuits
        1. 8.1.6.1 Single-Channel Voltage Divider
        2. 8.1.6.2 Single-Channel Amplifier Gain
          1. 8.1.6.2.1 Gain Scaling the RES60A-Q1 With the RES11A-Q1
      7. 8.1.7 Unconventional Instrumentation Amplifiers
    2. 8.2 Typical Application
      1. 8.2.1 Common-Mode Shifting Input Stage
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Examples
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 PSpice® for TI
        2. 9.1.1.2 TINA-TI™ Simulation Software (Free Download)
        3. 9.1.1.3 TI Reference Designs
        4. 9.1.1.4 Analog Filter Designer
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
8.1.6.2.1 Gain Scaling the RES60A-Q1 With the RES11A-Q1

The RES60A-Q1 is a precision matched resistor divider, optimized for extremely high-voltage applications. The RES60A-Q1 is often used in battery management system (BMS) applications to measure pack voltages. While multiple RES60A-Q1 ratios are available, additional effective ratios are achieved by finely scaling the divider output using a low-offset buffer amplifier and RES11A-Q1. The low ratiometric errors of the RES11A-Q1 minimize additional gain error contributions to the signal chain, while maximizing the input full-scale range (FSR) of downstream ADCs.

RES11A-Q1 Battery Pack Measurement with RES60A-Q1 and RES11A-Q1Figure 8-15 Battery Pack Measurement with RES60A-Q1 and RES11A-Q1
Equation 69. VMID=VBATT×RLVRHV+RLV=VBATTGR60+1
Equation 70. V O U T = V M I D R I N R G + 1 = V M I D 1 G R 11 + 1 = V B A T T 1 + G R 11 G R 11 × G R 60 + 1

For brevity, the effective transfer function of the RES60A-Q1, RES11A-Q1, and amplifier circuit is summarized as GSF.

Equation 71. G SF = G R 11 × G R 60 + 1 1 + G R 11
Equation 72. V OUT = V B A T T × 1 G SF

Table 8-8 shows the effective voltage divider scaling factor GSF associated with various RES60A-Q1 and RES11A-Q1 combinations. While not shown for brevity, the possible gain permutations discussed in Section 8.1.6.2 are also applicable here.

Table 8-8 Effective Scaling Factor GSF for the RES60A-Q1 and RES11A-Q1 Combinations
GR60 145 210 315 410 500 610 1000
GR11 EFFECTIVE SCALING FACTOR GSF
None 146.00 211.00 316.00 411.00 501.00 611.00 1001.00
1 73.00 105.50 158.00 205.50 250.50 305.50 500.50
1.5 87.60 126.60 189.60 246.60 300.60 366.60 600.60
1.6667 91.26 131.88 197.51 256.89 313.15 381.90 625.67
2 97.33 140.67 210.67 274.00 334.00 407.33 667.33
2.5 104.29 150.71 225.71 293.57 357.86 436.43 715.00
3 109.50 158.25 237.00 308.25 375.75 458.25 750.75
4 116.80 168.80 252.80 328.80 400.80 488.80 800.80
5 121.67 175.83 263.33 342.50 417.50 509.17 834.17
9 131.40 189.90 284.40 369.90 450.90 549.90 900.90
10 132.73 191.82 287.27 373.64 455.45 555.45 910.00