MSM7583 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7583

π/4 Shift QPSK MODEM

Oki Electric Industry 

¡ Semiconductor

MSM7583

ENV

Quadrature modulation signal envelope ( I2 + Q2 ) output.

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.

BSTO

Modulation burst window signal output.

The burst position for the I/Q baseband modulation output is output. (Refer to Fig. 1.)

(1) CR0 - B6 ="0".

TXD

TXCI

(384 kHz)

TXW

TXCO

(384 kHz)

I, Q

D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10D11D12D13

Dn-1 Dn

Ramp rise-up

2 symbols

Delay of 6.25 symbols

Ramp fall-down

2 symbols

Delay of 6.25 symbols

(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 D10D11D12D13

Dn-1 Dn

Ramp rise-up

2 symbols

Delay of 6.25 symbols

Ramp fall-down

2 symbols

Delay of 6.25 symbols

TXCI

(384 kHz)

TXW

BSTO

12

8 9 10

N

N+1 N+2

Figure 1 Transmitter Timing Diagram

N+16 N+17 N+18 N+19

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