ADRF6821 datasheet(55/61 Pages) AD

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Data Sheet

ADRF6821

Rev. A | Page 55 of 61

Address: 0x1234, Reset: 0x00, Name: FRAC2_H

FRAC2 Wor d for Ex ac t Fr equenc y Mode

- Optionally Double Buffer ed

[ 7 : 6 ] RES ERV ED

[ 5 : 0 ] FRAC2 [ 1 3 : 8 ] ( R/W )

Table 74. Bit Descriptions for FRAC2_H

Bits

Bit Name

Settings

Description

Reset

Access

[7:6]

RESERVED

Reserved

0x0

[5:0]

FRAC2, Bits[13:8]

FRAC2 Word for Exact Frequency Mode—Optionally Double Buffered

0x0

R/W

Address: 0x1235, Reset: 0x00, Name: MULTI_FUNC_SYNTH_CTRL_0235

DSM Phas e Adjus t Enable

[7:2] RESERVED

[0] RESERVED

[1] PHASE_ADJ_EN (R/W)

Table 75. Bit Descriptions for MULTI_FUNC_SYNTH_CTRL_0235

Bits

Bit Name

Settings

Description

Reset

Access

[7:2]

RESERVED

Reserved.

0x0

PHASE_ADJ_EN

DSM Phase Adjust Enable. If 1, a phase-adjust trigger causes a phase shift in the

Δ-Σ by the amount programmed in the phase word. The phase trigger is either

caused by a write to the LSB of the phase word or through a general-purpose

input (GPI) trigger. See GPI1_FUNC_SEL for more information.

0x0

R/W

RESERVED

Reserved.

0x0

Address: 0x1240, Reset: 0x00, Name: VCO_LUT_CTRL

Forc e the SPI to Cap-Selec t at the Output

of the Look Up Table (LUT)

Manual VCO Cap ac ito r Se le c t

Forc e the VCO Selec t and the Output

of the Look Up Table (LUT) from SI_VCO_SEL

[ 7 :5 ] RES ERV ED

[ 0 ] S I_V CO _FO RCE_CAP S ( R/W )

[ 4 ] S I_V CO _FO RCE_CAP S V CO I ( R/W )

[ 1 ] S I_V CO _FO RCE_V CO ( R/W )

[ 3 :2 ] RES ERV ED

Table 76. Bit Descriptions for VCO_LUT_CTRL

Bits

Bit Name

Settings

Description

Reset

Access

[7:5]

RESERVED

Reserved

0x0

SI_VCO_FORCE_CAPSVCOI

Manual VCO Capacitor Select

0x0

R/W

[3:2]

RESERVED

Reserved

0x0

R/W

SI_VCO_FORCE_VCO

Force the VCO Select and the Output of the Look Up Table (LUT) from

SI_VCO_SEL

0x0

R/W

SI_VCO_FORCE_CAPS

Force the SPI to Capacitor Select at the Output of the Look Up Table (LUT)

0x0

R/W

Address: 0x124D, Reset: 0x00, Name: LOCK_DETECT

State of the Lock Detect Signal

[7:1] RESERVED

[0] LOCK_DETECT (R)

Table 77. Bit Descriptions for LOCK_DETECT

Bits

Bit Name

Settings

Description

Reset

Access

[7:1]

RESERVED

Reserved

0x0

LOCK_DETECT

State of the Lock Detect Signal

0x0

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