LG G1500 Manual page 41

3. TECHNICAL BRIEF
BB Transmit section
This section generates in-phase and quadrature BB modulated GMSK signals (BT = 0.3) in
accordance with GSM 05.05 Phase 2 specifications.
• The transmit channel consists of a digital GMSK modulator, a matched pair of 10-bit DACs and a
matched pair of reconstruction filter.
BB Receive section
This section consists of two identical ADC channels that process baseband in-phase(I) and
quadrature(Q) input signals.
Each channel consists of a coarse switched capacitor input filter, followed by a high-order sigma-delta
modulator and a lowpass digital filter.
Auxiliary section
This section contains two auxiliary DACs (AFC DAC, IDAC) for system control.
This section also contains AUX ADC and Voltage Reference
AUX ADC : 6 channel 10 bits
AFC DAC : 13 bits
IDAC : 10 bits
Voiceband section
Receive audio signal from MIC. The phones use differential configuration.
Send audio signal to Receiver. The phones use differential configuration.
It interconnect with external device like main microphone, main receiver, ear-phon through the VOUT
NORP, VOUTNORN, VOUTAUXP, VOUTAUXN
VOUTNORP, VOUTNORN: Main Receiver positive/negative terminal.
VOUTAUXP, VOUTAUXN: Hands free kit speaker positive/negative terminal.
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