AD9557SLASHPCBZ datasheet(78/92 Pages) AD

78 / 92 page

AD9557

Data Sheet

Rev. A | Page 78 of 92

Table 80. DPLL Loop BW Scaling Factor—REFA Profile1

Address

Bits

Bit Name

Description

0x070F

[7:0]

Digital PLL loop bandwidth scaling factor, Bits[7:0] (default: 0xF4).

0x0710

[7:0]

DPLL loop BW scaling factor

(unit of 0.1 Hz)

Digital PLL loop bandwidth scaling factor, Bits[15:8] (default: 0x01).

The default for Register 0x070F to Register 0x0710 = 0x01F4 = 500 (50 Hz loop bandwidth.

The loop bandwidth should always be less than the DPLL phase detector frequency

divided by 20.

[7:1]

Reserved

Default: 0x00.

0x0711

BW scaling factor

Digital PLL loop bandwidth scaling factor, Bit 16 (default: 0b).

1Note that the default DPLL loop bandwidth is 50.4 Hz.

Table 81. R Divider—REFA Profile

Address

Bits

Bit Name

Description

0x0712

[7:0]

DPLL integer reference divider (minus 1), Bits[7:0] (default: 0xC5)

0x0713

[7:0]

R divider

DPLL integer reference divider, Bits[15:8] (default: 0x00)

[7:5]

Reserved

Default: 0x0

Enable REFA div2

Enables the reference input divide-by-2 for REFA

0 = bypass the divide-by-2 (default)

1 = enable the divide-by-2

0x0714

[3:0]

R divider

DPLL integer reference divider, Bits[19:16] (default: 0x0)

The default for Register 0x0712 to Register 0x0714 = 0x000C5 = 197 (which equals R = 198)

Table 82. Integer Part of Fractional Feedback Divider N1—REFA Profile

Address

Bits

Bit Name

Description

0x0715

[7:0]

DPLL integer feedback divider (minus 1), Bits[7:0] (default: 0x6B)

0x0716

[7:0]

Integer Part N1

DPLL integer feedback divider, Bits[15:8] (default: 0x07)

[7:1]

Reserved

Default: 0x00

0x0717

Integer Part N1

DPLL integer feedback divider, Bit 16 (default: 0b)

The default for Register 0x0715 to Register 0x717 = 0x0076B = (which equals N1 = 1900)

Table 83. Fractional Part of Fractional Feedback Divider FRAC1—REFA Profile

Address

Bits

Bit Name

Description

0x0718

[7:0]

The numerator of the fractional-N feedback divider, Bits[7:0] (default: 0x04)

0x0719

[7:0]

The numerator of the fractional-N feedback divider, Bits[15:8] (default: 0x00)

0x071A

[7:0]

Digital PLL fractional

feedback divider—FRAC1

The numerator of the fractional-N feedback divider, Bits[23:16] (default: 0x00)

Table 84. Modulus of Fractional Feedback Divider MOD1—REFA Profile

Address

Bits

Bit Name

Description

0x071B

[7:0]

The denominator of the fractional-N feedback divider, Bits[7:0] (default: 0x05)

0x071C

[7:0]

The denominator of the fractional-N feedback divider, Bits[15:8] (default: 0x00)

0x071D

[7:0]

Digital PLL feedback

divider modulus—MOD1

The denominator of the fractional-N feedback divider, Bits[23:16] (default: 0x00)

Table 85. Phase and Frequency Lock Detector Controls—REFA Profile

Address

Bits

Bit Name

Description

0x071E

[7:0]

Phase lock threshold, Bits[7:0] (default: 0xBC); default of 0x02BC = 700 ps

0x071F

[7:0]

Phase lock threshold

Phase lock threshold, Bits[15:8] (default: 0x02)

0x0720

[7:0]

Phase lock fill rate

Phase lock fill rate, Bits[7:0] (default: 0x0A = 10 code/PFD cycle)

0x0721

[7:0]

Phase lock drain rate

Phase lock drain rate, Bits[7:0] (default: 0x0A = 10 code/PFD cycle)

0x0722

[7:0]

Frequency lock threshold, Bits[7:0] (default: 0xBC); default of 0x02BC = 700 ps

0x0723

[7:0]

Frequency lock threshold, Bits[15:8] (default: 0x02)

0x0724

[7:0]

Frequency lock threshold

Frequency lock threshold, Bits[23:16] (default: 0x00)

0x0725

[7:0]

Frequency lock fill rate

Frequency lock fill rate, Bits[7:0] (default: 0x0A = 10 code/PFD cycle)

0x0726

[7:0]

Frequency lock drain rate

Frequency lock drain rate, Bits[7:0] (default: 0x0A = 10 code/PFD cycle)

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