LG GB107, Service Manual

Page: 13 / 115

13
3.1.2 Features
Baseband
• High performance fixed-point TEAKlite DSP
• C166S high performance microcontroller
• There are several Interfaces:
– I2S interface for DAI connections (for Tape Approval)
– High Speed SSC Interface for connection of external peripherals
– SIM Interface
– Keypad Interface (6x4 or 5x5 keys)
– EBU for external RAM/FLASH connection
– Asynchronous serial interface (incl. IrDA support capability)
– JTAG Interface
– Black & white and color displays are supported
– PWM source to drive vibrator
– Keypad and display backlight supported.
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.
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)