SBOU229A August   2019  – April 2022 THS6222

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 EVM Specifications
  3. 2Power Connections
    1. 2.1 Split-Supply Operation
    2. 2.2 Single-Supply Operation
  4. 3Input and Output Connections
    1. 3.1 Bias Mode Control Pins
    2. 3.2 IREF Pin Connection
    3. 3.3 Optional VCM Pin Connection
  5. 4Board Layout
  6. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials
  7. 6Related Documentation
  8. 7Revision History

3 Input and Output Connections

The THS6222RHFEVM is equipped with SMA connectors for easy connection of signal generators and analysis equipment. As shipped, the EVM is configured for a gain of 10-V/V, split-supply, differential input and output with 50-Ω termination. By default, the inputs INA and INB are configured for a differential input connection. To use the device with a single-ended input, either use an external transformer or populate transformer T1 on the board, remove R21, populate R15 with a 0-Ω resistor, and use INA as the single-ended input. OUTA (J5) is the output connector for single-ended output signals. The output resistors R10 and R11 in combination with the transformer (T2) on the amplifier output provide a 25-Ω load to the amplifier when terminated in 50 Ω differentially. To use the EVM with a single-ended output, remove resistor R23 and populate resistor R18 with 0 Ω, which gives a single-ended output on OUTA. The EVM contains provisions for additional output devices to change the loading of the amplifier and to add protection devices. See the THS6222 data sheet applications section, schematics, and layouts for more detail and how to reconfigure the EVM.