ZHCSBC4D May 2013 – May 2017 TAS5760MD
PRODUCTION DATA.
The TAS5760MD device requires two power supplies for proper operation. A high-voltage supply called PVDD is required to power the output stage of the speaker amplifier and its associated circuitry. Additionally, one low voltage power supply called DVDD is required to power the various low-power portions of the device. The allowable voltage range for both the PVDD and the DVDD supply are listed in the Recommended Operating Conditions table.
The DVDD supply required from the system is used to power several portions of the device it provides power to the DVDD pin and the DRVDD pin. Proper connection, routing, and decoupling techniques are highlighted in the TAS5760xx EVM User's Guide, SLOU371 (as well as the Application and Implementation section and Layout Example section) and must be followed as closely as possible for proper operation and performance. Deviation from the guidance offered in the TAS5760xx EVM User's Guide, which followed the same techniques as those shown in the Application and Implementation section, may result in reduced performance, errant functionality, or even damage to the TTAS5760MD device. Some portions of the device also require a separate power supply which is a lower voltage than the DVDD supply. To simplify the power supply requirements for the system, the TAS5760MD 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 ANA_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 headphone/line driver used in the TAS5760MD device are ground centered, requiring both a positive low-voltage supply and a negative low-voltage supply. The positive power supply for the headphone/line driver output stage is taken from the DRVDD pin, which is connected to the DVDD supply provided by the system. A charge pump is integrated in the TAS5760MD device to generate the negative low-voltage supply. The power supply input for the charge pump is the DRVDD pin. The CPVSS pin is provided to allow the connection of a storage 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 TAS5760xx EVM and should be followed as closely as possible to ensure proper operation of the device.
The output stage of the speaker amplifier drives the load using the PVDD supply. This is the power supply which provides the drive current to the load during playback. Proper connection, routing, and decoupling techniques are highlighted in the TAS5760xx EVM and must be followed as closely as possible for proper operation and performance. Due the high-voltage switching of the output stage, it is particularly important to properly decouple the output power stages in the manner described in the TaS5760xx EVM User's Guide, SLOU371. The lack of proper decoupling, like that shown in the EVM User's Guide, can results in voltage spikes which can damage the device. A separate power supply is required to drive the gates of the MOSFETs used in the output stage of the speaker amplifier. This power supply is derived from the PVDD supply via an integrated linear regulator. A GVDD_REG pin is provided for the attachment of decoupling capacitor for the gate drive voltage regulator. 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.