SBOSAN4A August   2025  – December 2025 PGA848

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Gain Control
      2. 7.3.2 Input Protection
      3. 7.3.3 Using the Output Difference Amplifier to Shape Noise
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Linear Operating Input Range
      2. 8.1.2 Current Consumption with Differential Inputs
    2. 8.2 Typical Applications
      1. 8.2.1 Driving a Single-Ended Input SAR ADC
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  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)
    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

8.1.2 Current Consumption with Differential Inputs

Programmable gain amplifiers such as the PGA848 use internal resistors to set the gain. Consequently, the current consumption is increased by the current that passes through these resistors. The largest supply current consumption occurs at G = 2V/V when applying large amplitude differential signals.

Note that IQvalues in the specifications section are under the condition VIN = 0V. Higher supply current is to be expected for higher differential input levels. Same goes to bias current IB, which is specified with zero differential input. Input bias current increases slightly with increased differential inputs up to the linear input range limit (see Section 8.1.1 for details), If the input exceeds the linear input range limit (inputs are overdriven), the input bias current significantly increases

Figure 8-5 to Figure 8-8 show typical current consumption versus input differential voltage for the input stage supply, and the current drawn by the PGA848 inputs when the device is overdriven. The dashed vertical reference lines outline the linear operating region of the device at that given gain (VIN), outside of this region is when the inputs of the device are overdriven.

PGA848 Current Consumption versus Differential Input Voltage
VS = VSOUT = ±15V VICM = VREF = 0V
G = 0.5V/V VIN linear limits = ±16V
Figure 8-5 Current Consumption versus Differential Input Voltage
PGA848 Current Consumption versus Differential Input Voltage
VS = VSOUT = ±15V VICM = VREF = 0V
G = 50V/V VIN linear limits = ±0.286V
Figure 8-7 Current Consumption versus Differential Input Voltage
PGA848 Current Consumption versus Differential Input Voltage
VS = VSOUT = ±15V VICM = VREF = 0V
G = 1V/V VIN linear limits = ±14.3V
Figure 8-6 Current Consumption versus Differential Input Voltage
PGA848 Current Consumption versus Differential Input Voltage
VS = VSOUT = ±15V VICM = VREF = 0V
G = 100V/V VIN linear limits = ±0.143V
Figure 8-8 Current Consumption versus Differential Input Voltage