ZHCSJZ2D August 2019 – April 2021 THS6222
PRODUCTION DATA
The THS6222 has four different functional modes set by the BIAS-1 and BIAS-2 pins. Table 7-1 shows the truth table for the device mode pin configuration and the associated description of each mode.
| BIAS-1 | BIAS-2 | FUNCTION | DESCRIPTION |
|---|---|---|---|
| 0 | 0 | Full-bias mode (100%) | Amplifiers on with lowest distortion possible |
| 1 | 0 | Mid-bias mode (75%) | Amplifiers on with power savings and a reduction in distortion performance |
| 0 | 1 | Low-bias mode (50%) | Amplifiers on with enhanced power savings and a reduction of overall performance |
| 1 | 1 | Shutdown mode | Amplifiers off and output is high impedance |
If the PLC application requires switching the line driver between all four power modes and if the PLC application-specific integrated circuit (ASIC) has two control bits, then the two control bits can be connected to the bias pins BIAS-1 and BIAS-2 for switching between any of the four power modes. However, most PLC applications only require the line driver to switch between one of the three active power modes and the shutdown mode. This type of 1-bit power mode control is illustrated in Figure 8-1, where the line driver can be switched between the full-bias and shutdown modes using just one control bit from the PLC ASIC. If switching between the mid-bias or low-bias modes and the shutdown mode is required for the application, then either the BIAS-1 or BIAS-2 pin can be connected to ground and the control pin from the PLC ASIC can be connected to the non-grounded BIAS pin.