LG GB115, Service Manual

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– PWM source to drive vibrator
– Keypad and display backlight supported.
– HASH Unit support for hashing.
Receiver
• Constant gain, direct conversion receiver with fully integrated blocking filter
• Two integrated LNAs
• No need of interstage and IF filter
• Highly linear RF quadrature demodulator
• Programmable DC output level
• Very low power budget.
• GPRS (up to Class 10 type1)
Transmitter
• Digital Sigma-Delta modulator for GMSK modulation, typical -163.5 dBc/Hz @ 20 MHz
• Single ended outputs to PA, Pout = +3.5 dBm
• Very low power budget.
RF-Synthesizer
•
ΣΔ
Synthesizer for multi-slot operation
• Fast lock-in times (< 150
μ
s)
• Integrated loop filter
• RF Oscillator
• Fully integrated RF VCO.
Crystal Oscillator
• Fully digital controlled crystal oscillator core with a highly linear tuning characteristic.
Mixed Signal and Power Management Unit
• DC/DC boost for voltages up to 15 V for driving White or Blue LEDs
• 8-Ohm loud speaker driver (250/350 mW)
• 16-Ohm earpiece driver
• 32-Ohm headset driver
• Measurement interfaces (PA temperature, battery voltage, battery temperature, and ambient
temperature)
• Accessory Detection
• PCB ID detection
• Differential microphone input
• System start up circuitry
• Charger circuitry for NiCd, NiMh and LiIon cells with integrated Control Current/Voltage Charging.
• Integrated regulators for direct connection to battery.
Package
X-GOLDTM102 utilizes an PG-VF2BGA-189-1 lead-free (green) package. The high degree of
integration in
X-GOLDTM102 in conjunction with a sophisticated designed ball-out allows building a complete