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3. TECHNICAL BRIEF
Figure 11 : AD6537B POWER MODE LOGIC
1 1 LDO block
There are 8LDOs in the AD6537B.
- VCORE : supplies Digital Baseband Processor core and AD6537 digital core (1.8V, 80mA)
- 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 (1.8V or 2.85V,
20mA)
- VRTC : supplies the Real-Time Clock module (1.8 V, 200 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)
- 35 -
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