Only For Training And Service Purposes - LG GM200 Service Manual

3. TECHNICAL BRIEF
Baseband Analog (VABB)
The Baseband Analog regulator supplies the analog portions of the AD6725-ATLAS3H LITE. Operation of
the VABB regulator is controlled by the VABB En bit in the LDOControl1 register.
If VABB En = 0, the VABB regultor will be disabled unless the AFCDAC is enabled or VCXOEN = 1. If VABB
En = 1 (the default state) VABB is enabled along with VCORE, VMEM, and VEXT. The Baseband Analog
regulator is optimized for high ripple rejection and low noise. The output of the Baseband Analog
regulator should not be used as a supply for any external components.
Microphone (VMIC)
The Microphone regulator supplies the microphone interface circuitry. The Microphone regulator is
optimized for extremely high ripple rejection up to 217 Hz and low noise.
VRF (VRF)
The VCXO regulator supplies the voltage controlled crystal oscillator (VCXO). The VCXO regulator is
optimized for high ripple rejection and low noise.
USB Interface (VUSB)
The VUSB regulator supplies the USB transceiver located in the DBB. Digital Baseband PLL (VPLL) The
VPLL regulator supplies the phase locked loop on the digital baseband (DBB).
General Purpose Regulator (VGP)
The General Purpose regulator is intended primarily to serve as a supply rail for camera modules. Its
voltage is programmable by setting VGPSel[3:0] in theLDOControl2 Register. VGP is enabled by setting
the VGP En bit in LDOControl1 to 1.
Applications Regulator (VAPP)
The VAPP regulator is an adjustable regulator that uses an off chip pass device. It has two modes of
operation selected by the state of the VAPPCFG terminal. If VAPPCFG is pulled low the VAPP regulator
functions as a programmable voltage applications supply.
In this mode, VAPP is enabled or disabled using the VAPP En bit of LDOControl1.
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Only for training and service purposes