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P7389i – Circuit Description
13) The signal is then passed to the new
(Multiple Accumulator GSM IC Dual Mode)
14) The signal is then demodulated internally using an external 800 MHz Varactor diode
CR249, RX Local Oscillator set up, which is driven by
DM
U200.
15) Where in earlier products, we used to have
only used in digital form within the MAGIC DM and can only be measured using a
specific set up. The demodulated signal is now converted internally to a base band
digital form to be passed along an RX SPI bus to the Whitecap.
16) The
RX SPI
signal is made up of
Frame Synch Receive) and
DM Pins G8, G9 and F7 respectively.
17) If internal signal GPRS_TX is high the base band data signal
from a 2's compliment 8 bit data word to a 10 bit data word
I.e. Normal Mode:
GPRS Mode:
18) The new
SPS ROM 6 Whitecap U800
within the Whitecap the signal is digitally processed. Baud rate reduced, Error
correction bits removed, deciphered and de-interleaved.
19) The digital signal is now being fed down the
U900, internally to the GCAP, the digital signal is converted to analogue and
distributed to the correct outputs:
20) For Earpiece speaker, from GCAP II Pins H6 and H7 to speaker pads
21) The Alert is generated within the Whitecap, given the appropriate data from the
incoming signal, SMS, call etc... and is fed to the alert pads
signal is supported by the signal ALRT_VCC, which is generated from B+ through
Q903.
22) For the headset only the
then fed out to the
RF:
Transmit
1) There are 2 Mic inputs, firstly from the
fed to the
GCAP II U900
2) Secondly the analogue voice can be fed from the Aux Mic attached to the headset and
will be routed from connection 5 of the
Motorola Internal Use
MAGIC DM DM IC U200
BDR
(Base band Data Receive),
BCLKR
(Base band Clock Receive, fed from MAGIC
8 I bits, 8 Q bits, 32 zeros
10 I bits, 6 zeros, SDFS pulse, 10 Q bits, 6 zeros (16 idle bit times)
receives these signals on Pins A3, D4 and B4,
SPKR-
signal is used from GCAP II Pin H6.The output is
Headset Jack socket J504.
Xcvr Mic
Pin J2.
Headset Jack
PLL CP
RX RXQ, and I
these signals are now
BDR
DIG_AUD_SPI
bus to the
J5003
Pin 3.
J900, where the analogue input is
J504, through to GCAP II, Pin
4
PRE IN
Pin A7
Pin E9 of
MAGIC
BFSR
(Base band
will be converted
GCAP II
J502
and
J503
and J5004. This
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