AD9551SLASHPCBZ datasheet(38/40 Pages) AD

38 / 40 page

AD9551

Rev. B | Page 38 of 40

OUT1 Driver Control (Register 0x32)

Table 33.

Address

Bit

Bit Name

Description

0x32

OUT1 drive strength

Controls the output drive capability of the OUT1 driver.

0 = weak.

1 = strong (default).

OUT1 power-down

Controls power-down functionality of the OUT1 driver.

0 = OUT1 active (default).

1 = OUT1 powered down.

[5:3]

OUT1 mode control

OUT1 driver mode selection.

000 = CMOS, both pins active.

001 = CMOS, positive pin active, negative pin tristate.

010 = CMOS, positive pin tristate, negative pin active.

011 = CMOS, both pins tristate.

100 = LVDS.

101 = LVPECL (default).

110 = not used.

111 = not used.

[2:1]

OUT1 CMOS polarity

Selects the polarity of the OUT1 pins in CMOS mode.

00 = positive pin logic is true = 1, false = 0/negative pin logic is true = 0, false = 1 (default).

01 = positive pin logic is true = 1, false = 0/negative pin logic is true = 1, false = 0.

10 = positive pin logic is true = 0, false = 1/negative pin logic is true = 0, false = 1.

11 = positive pin logic is true = 0, false = 1/negative pin logic is true = 1, false = 0.

These bits are ineffective unless Bits[5:3] select CMOS mode.

Enable SPI control of OUT1

driver control

Controls OUT1 driver functionality.

0 = OUT1 is LVDS or LVPECL, per the OUTSEL pin (Pin 16) (default).

1 = OUT1 functionality defined by Bits[7:1].

Input PLL Control (Register 0x33)

Table 34.

Address

Bit

Bit Name

Description

0x33

Loop filter sample rate control

Select/bypass 8× clock divider to the digital loop filter.

0 = selected (default).

1 = bypassed.

Select 2× frequency divider

Select/bypass the 2× frequency divider.

0 = bypassed (default).

1 = selected.

Note that this bit is not functional in 19.44 MHz mode.

[5:4]

Select crystal frequency

Select the crystal frequency for 19.44 MHz mode.

00 = 52.000 MHz (default).

01 = 50.000 MHz.

10 = 49.860 MHz.

11 = 49.152 MHz.

Note that these bits are functional only in 19.44 MHz mode.

[3:0]

Unused

Unused.

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