ZHCSGH3A March 2016 – July 2017 TAS5782M
PRODUCTION DATA.
The DVDD supply that is required from the system is used to power several portions of the device. As shown in Figure 83, it provides power to the DVDD pin, the CPVDD pin, and the AVDD pin. Proper connection, routing, and decoupling techniques are highlighted in the Application and Implementation section and the Layout Example section) and must be followed as closely as possible for proper operation and performance. Deviation from the guidance offered in the TAS5782M device Application and Implementation section can result in reduced performance, errant functionality, or even damage to the TAS5782M device.
Some portions of the device also require a separate power supply that is a lower voltage than the DVDD supply. To simplify the power supply requirements for the system, the TAS5782M device includes an integrated low-dropout (LDO) linear regulator to create this supply. This linear regulator is internally connected to the DVDD supply and its output is presented on the DVDD_REG pin, providing a connection point for an external bypass capacitor. It is important to note that the linear regulator integrated in the device has only been designed to support the current requirements of the internal circuitry, and should not be used to power any additional external circuitry. Additional loading on this pin could cause the voltage to sag, negatively affecting the performance and operation of the device.
The outputs of the high-performance DACs used in the TAS5782M device are ground centered, requiring both a positive low-voltage supply and a negative low-voltage supply. The positive power supply for the DAC output stage is taken from the AVDD pin, which is connected to the DVDD supply provided by the system. A charge pump is integrated in the TAS5782M device to generate the negative low-voltage supply. The power supply input for the charge pump is the CPVDD pin. The CPVSS pin is provided to allow the connection of a filter capacitor on the negative low-voltage supply. As is the case with the other supplies, the component selection, placement, and routing of the external components for these low voltage supplies are shown in the TAS5782M and should be followed as closely as possible to ensure proper operation of the device.