Nokia 9000i Service Manual page 65

After Sales
Technical Documentation
Table 40. External Signals and Connections, Outputs
Signal Name
DAX Data acknowledge
AFC Automatic frequency control voltage
TXC TX transmit power control voltage / RX AGC voltage
TXQP,TXQN differential TX quadrature signal
TXIP,TXIN differential TX in–phase signal
PDATA0 LNA gain reduction
Table 41. External Signals and Connections, Bidirectional
Signal Name
RFIDA(11:0) 12–bit data bus
Block description
The RFI provides A/D conversion of the in–phase (RXI) and quadrature
(RXQ) signals in receive path. It has 12 bit A/D converters and the output
sample rate is 541.667 kHz.
Analog transmit path includes 8 bit D/A converters to generate the
in–phase (TXI) and quadrature (TXQ) signals. RFI has differential outputs
for TXI and TXQ. The sample rate is 1.0833 MHz.
There is an 11 bit D/A converter for automatic frequency correction (AFC).
The sample rate is 1.3542 kHz.
Power ramp (TXC) is done with 10 bit D/A converter. The sample
frequency is 1.0833 MHz. This converter is also used for AGC during
receive slots.
The PDATA0 signal is used for LNA gain reduction in strong field
conditions. The rest of the AGC control is analog. The analog AGC (used
in receive) is multiplexed with the TXC signal (used in transmit).
The RFI has 12 bit data bus to the ASIC. The registers in the RFI are
accessed using 4 address bits. Control and clock signals are coming from
the ASIC.
The RFI has external 4.096 V voltage reference.
Main components
– RFI ASIC, physically in MCM2
– 4.096 V external voltage reference LM4040 (V420)
Original, 08/96
Signal description
Signal description
RAE/RAK–1N
Baseband
To
ASIC
RF
RF
RF
RF
RF
To/From
ASIC
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