LG CU920 - Page 43

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Only for training and service purposes
3. TECHNICAL BRIEF
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The RBR1000 IC provides the received FLO baseband signal to the MBD1000 IC: a pair of differential
analog components, in-phase (I) and quadrature (Q). These are input to the MBD1000 IC at the
RX_IP, RX_IM, RX_QP, and RX_QM pins, and immediately digitized by the analog-to-digital converter
(ADC) circuits.
The MBD1000 IC enables and disables the FLO RF receiver using a dedicated control line: the
RF_ON signal.
After the ADC, the digitized signal is monitored and factored into control commands sent to the
RBR1000 IC via the single-wire serial bus interface (SSBI). These SSBI controls set RBR parameters
for optimal receiver performance. The digitized signal also forms the input to the FLO demodulator
circuits.
Figure. 3.5.9.2.2 RBR1000 pin assignment (top view)
only CU920