msm7582b Oki Semiconductor, msm7582b Datasheet - Page 6

• Manufacturer Part Number: msm7582b
• Description: Pie/4 Shift Qpsk Modem
• Manufacturer: Oki Semiconductor

¡ Semiconductor
MSM7582B
Quadrature modulation signal I component differential analog outputs.
Their output levels are 500 mV
are: R 10 kW, C 20 pF. The gain of these pins can be adjusted using the control register CR1
– B7 to B4, and the offset voltage at the I– pin can be adjusted using CR3 – B7 to B3.
Q+, Q–
Quadrature modulation signal Q component differential analog outputs.
Their output levels are 500 mV
are: R 10 kW, C 20 pF. The gain of these pins can be adjusted using the control register CR1
– B3 to B0, and the offset voltage at the Q– pin can be adjusted by using CR4 – B7 to B3.
I+, I–
(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
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13
Delay of 6.25 symbols
Delay of 6.25 symbols
 


Figure 1-2 Transmit Timing Diagram
Ramp rise-up
2 symbols
Ramp rise-up
2 symbols
pp
PP
with 1.6 Vdc as the center value. The output pin load conditions
with 1.6 Vdc as the center value. The output pin load conditions
Dn-1 Dn
Dn-1 Dn
Delay of 6.25 symbols
Delay of 6.25 symbols

MSM7582/7582B
Ramp fall-down
2 symbols
Ramp fall-down
2 symbols
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