SBOU268 November   2021 OPA593

 

  1.   Trademarks
  2. 1Overview
    1. 1.1 Getting Started
      1. 1.1.1 Related Documentation From Texas Instruments
    2. 1.2 High-Voltage Warning and Safe Use
    3. 1.3 Electrostatic Discharge Caution
  3. 2Operation
    1. 2.1 Jumper Blocks, Jacks, and Test Points
    2. 2.2 Inputs
    3. 2.3 Outputs
    4. 2.4 Enable or Disable
    5. 2.5 Status Flags
      1. 2.5.1 Circuit Protection
  4. 3Application Circuits
    1. 3.1 Setting Dual-Supply or Single-Supply Operation
      1. 3.1.1 Dual-Supply Operation Configuration
      2. 3.1.2 Single-Supply Operation Configuration
    2. 3.2 Common Op-Amp Configurations
      1. 3.2.1 Inverting Gain of –10 V/V
        1. 3.2.1.1 External Connections for –10 V/V Inverting Gain Configuration
        2. 3.2.1.2 Inverting Gain of –10 V/V Configuration Electrical Performance
      2. 3.2.2 Noninverting Gain of +2 V/V
        1. 3.2.2.1 External Connections to OPA593EVM for Noninverting Gain Configuration
        2. 3.2.2.2 Noninverting Gain Configuration Electrical Performance
      3. 3.2.3 Gain of +10 V/V Difference Amplifier
        1. 3.2.3.1 Jumper Shunt Locations for Difference-Amplifier Configuration
        2. 3.2.3.2 Gain of 10 V/V Difference Amplifier Configuration Electrical Performance
      4. 3.2.4 Improved Howland Current Pump
        1. 3.2.4.1 Jumper Shunt Locations for Improved Howland Current Pump Configuration
  5. 4Schematic, PCB Layout, and Bill of Materials
    1. 4.1 EVM Schematic
      1. 4.1.1 EVM Default Configuration
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials

2.4 Enable or Disable

The OPA593 features output enable-disable capability. The OPA593 is enabled or operates by floating the E/D pin, which is the normal mode for the OPA593EVM. However, shorting the E/D pin to the E/D Com pin (labeled EDcom on the EVM board) disables the device output. JP11 on the EVM is used to control the enable-disable function. The OPA593 output is automatically enabled when JP11 is left open. However, adding a shorting jumper shunt across JP11 disables the OPA593 output. When the OPA593 is disabled, the op amp power consumption is reduced significantly.

JP11 can be driven externally from a digital source producing 3-V logic levels. An EVM input jack for that purpose is not provided, but JP11 can be used to access the enable-disable control circuitry input, if needed. The enable-disable opto-isolator circuit portion is not optimized for speed, but rather versatility; therefore, keep the switching seeds low.

A jumper shunt across JP17 sets the voltage on the E/D Com pin (EDcom), to which the E/D pin is referenced. The 3-pin, 2-positiion jumper block is located near the OPA593, and is used to connect the E/D Com pin (EDcom) to either negative supply VSS, or GND (0 V). Setting E/D Com (EDcom) to one or the other is of no consequence for the OPA593EVM because the enable-disable function behaves very much the same with either reference level. However, having the choice built into the EVM allows the OPA593 to be set to one or the other of the two most-common reference levels used for OPA593 applications.