ADRF6821 datasheet(54/61 Pages) AD

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ADRF6821

Data Sheet

Rev. A | Page 54 of 61

Address: 0x122D, Reset: 0x81, Name: MULTI_FUNC_SYNTH_CTRL_022D

Enable Phase Detector and Charge

Pum p

Bleed Enable

Selects the Bleed Polarity

Integer-N ABP Select

[7] EN_PFD_CP (R/W)

[0] BLEED_EN (R/W)

[6] BLEED_POL (R/W)

[1] RESERVED

[5:3] RESERVED

[2] INT_ABP (R/W)

Table 70. Bit Descriptions for MULTI_FUNC_SYNTH_CTRL_022D

Bits

Bit Name

Settings

Description

Reset

Access

EN_PFD_CP

Enable Phase Detector and Charge Pump.

0x1

R/W

BLEED_POL

Selects the Bleed Polarity.

0x0

R/W

[5:3]

RESERVED

Reserved.

0x0

INT_ABP

Integer-N ABP Select. Shortens the reset delay of the PFD by four inverters.

0x0

R/W

RESERVED

Reserved.

0x0

BLEED_EN

Bleed Enable.

0x1

R/W

Address: 0x122E, Reset: 0x0F, Name: CP_CURR

Main Charge Pum p Current

[7:4] RESERVED

[3:0] CP_CURRENT (R/W)

Table 71. Bit Descriptions for CP_CURR

Bits

Bit Name

Settings

Description

Reset

Access

[7:4]

RESERVED

Reserved

0x0

[3:0]

CP_CURRENT

Main Charge Pump Current

0xF

R/W

Address: 0x122F, Reset: 0x08, Name: BICP

Binary Scaled Bleed Current

[7:0] BICP (R/W )

Table 72. Bit Descriptions for BICP

Bits

Bit Name

Settings

Description

Reset

Access

[7:0]

BICP

Binary Scaled Bleed Current

0x8

R/W

Address: 0x1233, Reset: 0x00, Name: FRAC2_L

FRAC2 Wor d for Ex ac t Fr equenc y Mode

- Optionally Double Buffer ed

[ 7 : 0 ] FRAC2 [ 7 : 0 ] ( R/W )

Table 73. Bit Descriptions for FRAC2_L

Bits

Bit Name

Settings

Description

Reset

Access

[7:0]

FRAC2, Bits[7:0]

FRAC2 Word for Exact Frequency Mode—Optionally Double Buffered

0x0

R/W

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