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Sub-systems
One LDO for RF transceiver
High Operation Efficiency and Low Stand-by Current
Li-Ion Battery Charge function
SIM Card Interface
Two Open-Drain Output Switches to Control the LED and Vibrator
Three NMOS switches to control RGB LEDs
Thermal Overload Protection
Under Voltage Lock-out Protection
Over Voltage Protection
Power-on Reset and Start-up Timer
Test and Debug
Built-in digital and analog loop back modes for both Audio and Baseband Front-End
DAI port complying with GSM Rec.11.10
JTAG port for debugging embedded MCU
3.1.3 MODEM Features
Radio Interface and Baseband Front End
GMSK modulator with analog I and Q channel outputs
10-bit D/A Converter for uplink baseband I and Q signals
14-bit high resolution A/D Converter for downlink baseband I and Q signals
Calibration mechanism of offset and gain mismatch for baseband A/D Converter and D/A
Converter
10-bit D/A Converter for Automatic Power Control
13-bit high resolution D/A Converter for Automatic Frequency Control
Programmable Radio RX filter with adaptive bandwidth control
Dedicated Rx filter for FB acquisition
2 Channels Baseband Serial Interface (BSI) with 3-wire control
Bi-directional BSI interface. RF chip register read access with 3-wire or 4-wire interface.
10-Pin Baseband Parallel Interface (BPI) with programmable driving strength
Multi-band support
Voice and Modem CODEC
Dial tone generation
Voice Memo
Noise Reduction
Echo Suppression
Advanced Sidetone Oscillation Reduction
Digital sidetone generator with programmable gain
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