SBOSAA4B April   2025  – August 2025 INA1H94-SP

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: INA1H94-SP
    5. 5.5 Electrical Characteristics: VS = ±9V
    6. 5.6 Electrical Characteristics: V+ = 5V and V– = 0V
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Common-Mode Range
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 SAR ADC 12-B, 8-Channel Battery Cell Voltage Monitor
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 PSpice® for TI
        2. 8.1.1.2 TINA-TI™ Simulation Software (Free Download)
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.1 Common-Mode Range

Figure 6-1 shows the basic connections required for dual-supply operation. Applications with noisy or high-impedance power-supply lines can require decoupling capacitors placed close to the device pins. The output voltage is equal to the differential input voltage between pins 1 and 8. The common-mode input voltage is rejected. Figure 6-2 shows the basic connections required for single-supply operation.

INA1H94-SP Power and Signal Connections for Dual-Supply Operation Figure 6-1 Power and Signal Connections for Dual-Supply Operation
INA1H94-SP Power and Signal Connections for Single-Supply Operation Figure 6-2 Power and Signal Connections for Single-Supply Operation

Most applications use the INA1H94-SP as a simple unity-gain difference amplifier. Equation 1 shows the transfer function:

Equation 1. VOUT = (+IN) – (–IN)

Some applications, however, apply voltages to the reference terminals (REFA and REFB). Equation 2 shows the complete transfer function:

Equation 2. VOUT = (+IN) – (–IN) + 20 × REFA – 19 × REFB

The high common-mode range of the INA1H94-SP is achieved by dividing down the input signal with a high precision resistor divider. This resistor divider brings both the positive input and the negative input within the input range of the internal operational amplifier. This input range depends on the supply voltage of the INA1H94-SP.

Figure 5-1 can be used to determine the maximum common-mode range for a specific supply voltage. The maximum common-mode range can also be calculated by ensuring that both the positive and the negative input of the internal amplifier are within 1.5V of the supply voltage.

In case the voltage at the inputs of the internal amplifier exceeds the supply voltage, the internal ESD diodes start conducting current. This current must be limited to 10mA to make sure not to exceed the absolute maximum ratings for the device.