SBOU263 April   2021 OPA3S2859

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
  3. 2Configuration and Usage
    1. 2.1 Power Connections
    2. 2.2 Power Down, Select, and Latch Connections
    3. 2.3 Input and Output Signal Connections
    4. 2.4 Feedback Network Configurations
    5. 2.5 Important Layout Considerations
    6. 2.6 Schematic
    7. 2.7 Layout Prints
  4. 3Related Documentation
  5. 4Revision History

2.2 Power Down, Select, and Latch Connections

The OPA3S2859-EP features control signals to adjust the selected gain paths of each channel (SEL0, SEL1, LTCH_A, and LTCH_B) and power down input to put the device into a low-current mode. The EVM includes the option to use simple jumper configurations to control these signals or SMA connectors for interfacing with test equipment. Each input connections includes a footprint for an optional decoupling capacitor or impedance matching resistor if using a high speed control signal. The jumper configuration simply shorts the respective control line to VCC or VEE to change the pin function. Please refer to the Enhanced Product, Dual-Channel, 900-MHz, 2.5-nV/√Hz, Programmable Gain Transimpedance Amplifier data sheet for exact pin threshold voltages when using an external signal.