3. TECHNICAL BRIEF
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2. LDO Block
1. There are 8 LDOs in the AD6535.
- VCORE : supplies Digital baseband Processor core and AD6535 digital core
- VMEM : supplies external memory and the interface to the external memory on the digital
baseband processor (1,8V or 2.8V, 150mA)
- VEXT : supplies Radio digital interface and high voltage interface (2.8V, 170mA)
- VSIM : supplies the SIM interface circuitry on the digital processor and SIM card (2.85V, 20mA)
- VRTC : supplies the Real-Time Clock module (1.8 V, 20 µA)
- VABB : supplies the analog portions of the AD6537B
- VMIC : supplies the microphone interface circuitry (2.5 V, 1 mA)
- VVCXO : supplies the voltage controlled crystal oscillator ( 2.75 V, 10 mA)
- VBACK : charges the backup battery and supplies the RTC regulator (2.8V, 1.8V)
- VAPP : supplies application co-processors such as a touch screen digitizer (3.0V, 1.8V)
- VUSB : supplies the USB interface.
Figure 3-14. AD6535 POWER MODE LOGIC
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