msm7583 Oki Semiconductor, msm7583 Datasheet - Page 5

• Manufacturer Part Number: msm7583
• Description: Shift Qpsk Modem
• Manufacturer: Oki Semiconductor

(1) CR0 - B6 ="0".
TXD
TXCI
(384 kHz)
TXW
TXCO
(384 kHz)
I, Q
(2) CR0 - B6 ="1".
TXD
TXCI
(3.84 MHz)
TXW
TXCO
(384 kHz)
I, Q
TXCI
(384 kHz)
TXW
BSTO
¡ Semiconductor
ENV
BSTO
Quadrature modulation signal envelope (
Its output level is 500 mVpp with 1.6 Vdc as a center value. The output pin load conditions are:
R 10 kW , C £ 20 pF. The gain of this output can be adjusted using the control registers CR2
- B7 to B4.
This pin is also used to monitor eye pattern, AFC compensating signal, and phase detection of
the demodulator block during the test mode. Refer to the description of the control register for
details.
Modulation burst window signal output.
The burst position for the I/Q baseband modulation output is output. (Refer to Fig. 1.)
D0 D1
D0 D1
1
D2 D3 D4 D5 D6 D7 D8 D9
D2 D3 D4 D5 D6 D7 D8 D9
Delay of 6.25 symbols
Delay of 6.25 symbols
2
Figure 1 Transmitter Timing Diagram
Ramp rise-up
Ramp rise-up
8
2 symbols
2 symbols
9
D10
D10
D11
D11
10
D12
D12
D13
D13
I + Q
2
D
D
N
n
n
-1 D
-1 D
2
n
n
) output.
N+1
N+2
Delay of 6.25 symbols
Delay of 6.25 symbols
N+16
Ramp fall-down
Ramp fall-down
N+17
2 symbols
2 symbols
MSM7583
N+18
5/23
N+19