CXD1961AQ 查看數據表（PDF） - Sony Semiconductor

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CXD1961AQ

DVB-S Frontend IC (QPSK demodulation + FEC)

Sony Semiconductor 

CXD1961AQ

Sub address 13 (hex)

Sub address 14 (hex)

Sub address 15 (hex)

Sub address 16 (hex)

Sub address 17 (hex)

Write

Write

Write

Write

Write

TUN_DAT1

TUN_DAT2

TUN_DAT3

TUN_DAT4

TUN_DAT5

Tuner control data

Tuner control data

Tuner control data

Tuner control data

Tuner control data

(I2C bus mode)

Set TUNSEL = 0 and TUNEN = 1 in the register 0F (hex).

13 (hex): Tuner PLL IC slave address + 0 (write mode)

14 to 17 (hex): Write data (tuning parameter)

I2C bus starts write operation when data setting to register 17 (hex) is finished. In

case of no acknowledge from tuner PLL IC, NAK in the register 09 (hex)-A is set

to 1.

(3 wire mode)

Set TUNSEL = 1 and TUEN = 1 in the register 0F (hex). 28 bits data (register 13

to 15 (hex) and upper 4bit of the register 16 (hex)) are transmitted serially. To

start operation, dummy data setting to the register 17 (hex) is needed.

Refer to the reference circuit (5).

Sub address 18 (hex)

Sub address 19 (hex)

Sub address 1A (hex)

Write

Write

Write

SYM_RATE1

SYM_RATE2

SYM_RATE3

Control word for multi-rate oscillation

Control word for multi-rate oscillation

Control word for multi-rate oscillation

NCO23 to NCO0

(MSB) (LSB)

The relation between symbol rate and the control word of the NCO is:

NCO [23:0] = (symbol rate) × 222 ÷ (crystal frequency)

Ex.) Symbol rate 20MSPS crystal 32MHz

NCO [23:0] = 20 × 106 × 222 ÷ 32 × 10–6

= 2,621,440

= 221 + 219

NCO21 = NCO19 = 1, other = 0

– 25 –

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