AD9993BBCZ datasheet(39/57 Pages) AD

39 / 57 page

AD9993

Data Sheet

Rev. A | Page 38 of 56

LOOP FILTER CONTROL SIGNALS REGISTER

Address: 0x02F, Reset: 0xF7, Name: LF_CTRL2

Table 28. Bit Descriptions for LF_CTRL2

Bits

Bit Name

Description

Reset

Access

[7:6]

LF_R3

Loop filter coefficient.

0x3

00 = 4.63 kΩ.

01 = 2.315 kΩ.

10 = 1.543 kΩ.

11 = 1.157 kΩ

[5:4]

LF_R1

Loop filter coefficient.

0x3

00 = 12.04 kΩ.

01 = 6.02 kΩ.

10 = 4.01 kΩ.

11 = 3.01 kΩ.

[2:0]

LF_C3

Loop filter coefficient.

0x7

000 = 0.6325 pF.

001 = 1.265 pF.

010 = 1.8975 pF.

011 = 2.530 pF.

100 = 3.1625 pF.

101 = 3.795 pF.

110 = 4.4275 pF.

111 = 5.06 pF.

LOOP FILTER CONTROL SIGNALS REGISTER

Address: 0x030, Reset: 0x00, Name: LF_CTRL3

Table 29. Bit Descriptions for LF_CTRL3

Bits

Bit Name

Description

Reset

Access

EXT_CP_SEL

Short external CP pin to charge pump output.

0x0

BYP_R3

Bypass R3 in loop filter.

0x0

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AD9993BBCZ 数据表(PDF) 39 Page - Analog Devices

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