AD9551SLASHPCBZ datasheet(15/40 Pages) AD

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AD9551

Rev. B | Page 15 of 40

The Y[3:0] pins select the divider values for the feedback path of

the output PLL, as well as for the OUT1 dividers, P0 and P1. The

OUT2 divider, P2, defaults to unity unless otherwise program-

med using the serial port. Table 14 lists the feedback and output

divider values based on the logic state of the Y[3:0] frequency

selection pins. The table headings are as follows:

•

Y[3:0]. The logic state of the Y[3:0] pins.

•

N. The integer part of the feedback divider.

•

MOD. The modulus of the feedback SDM.

•

FRAC. The fractional part of the feedback SDM.

•

P0, P1. The P0 and P1 divider values.

•

fOUT1. The frequency of the OUT1 output.

The divider settings shown in Table 14 produce the indicated

frequency at OUT1 when the frequency at the reference input

of the output PLL’s PFD (fIF) is exactly 26 MHz.

When operating in the 19.44 MHz mode, the N, MOD, and FRAC

values may be different from those shown in Table 14, but the

fOUT1 values remain the same. The reason is that the 19.44 MHz

mode relies on a crystal with a resonant frequency other than 26

MHz (see the 19.44 MHz Mode section in the Operating Modes

portion of the Theory of Operation section).

Table 14. Preset Output Settings

Y[3:0]

MOD

FRAC

P0, P1

fOUT1 (MHz)

0000

143

520,000

289,600

6/1

622.08

0001

144

520,000

120,000

6/1

625

0010

144

308,100

236,736

6/1

( )

627

622

237

239

≈

0011

148

520,000

22,400

6/1

( )

641

622

≡

0100

148

465,920

343,840

6/1

( )

53125

644

625

≡

0101

151

520,000

370,625

6/1

421875

657

10518

≡

0110

152

465,920

163,160

6/1

( )

660

238

239

10518

≈

0111

153

465,920

377,856

6/1

( )

666

622

255

≈

238

1000

154

328,640

151,168

6/1

( )

669

622

237

255

≈

1001

154

460,096

245,216

6/1

( )

669

625

≈

1010

155

490,880

56,192

6/1

( )

672

622

236

255

≈

1011

133

328,640

119,005

5/1

( )( )

693

625

237

255

≈

1100

133

470,080

433,856

5/1

( )

696

622

226

253

≈

1101

135

349,440

159,975

5/1

( )

704

238

255

10518

≈

1110

136

394,368

11,577

5/1

( )

707

237

255

10518

≈

1111

149

520,000

280,000

5/1

( )

777

622

≡

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