LG KG270 Service Manual page 15

3. TECHNICAL BRIEF
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
- 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
• Σ∆Synthesizer for multi-slot operation
• Fast lock-in times (< 150 •Ïs)
• Integrated loop filter
• RF Oscillator
• Fully integrated RF VCO.
] Crystal Oscillator
• Fully digital controlled crystal oscillator core with a highly linear tuning characteristic.
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