ADRF6821 datasheet(45/61 Pages) AD

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Data Sheet

ADRF6821

Rev. A | Page 45 of 61

Address: 0x0054, Reset: 0x00, Name: DC_COMP_Q_CHAN_RF1

DC Com pens ation Q Channel

[7:0] CODE_DC_QDAC_RF1 (R/W)

Table 40. Bit Descriptions for DC_COMP_Q_CHAN_RF1

Bits

Bit Name

Settings

Description

Reset

Access

[7:0]

CODE_DC_QDAC_RF1

DC Compensation Q Channel. Controls the dc correction applied to the IF

path. LSB is approximately ½ mV referred to the output. Value is signed

magnitude notation. 0xFF is the most negative, and 0x7F is the most positive.

0x0

R/W

Address: 0x0060, Reset: 0x00, Name: LPF_BW_SEL

MSB for LPF Bandw idth Select

LSB for LPF Bandw idth Select

[ 7 :2 ] RES ERV ED

[ 0 ] S EL_LP F_BW _M S B ( R/W )

[ 1 ] S EL_LP F_BW _LS B ( R/W )

Table 41. Bit Descriptions for LPF_BW_SEL

Bits

Bit Name

Settings

Description

Reset

Access

[7:2]

RESERVED

Reserved.

0x0

SEL_LPF_BW_LSB

LSB for LPF Bandwidth Select. See the Theory of Operation section.

0x0

R/W

SEL_LPF_BW_MSB

MSB for LPF Bandwidth Select. See the Theory of Operation section.

0x0

R/W

Address: 0x0070, Reset: 0x00, Name: IF_AMP_CTRL

I Channe l IF Am p lifie r Enab le (0 :o ff 1:o n)

Q Channel IF Am plifier Enable (0:off

1:o n)

[ 7 :2 ] RES ERV ED

[ 0 ] EN _IFAM P _I ( R/W )

[ 1 ] EN _IFAM P _Q ( R/W )

Table 42. Bit Descriptions for IF_AMP_CTRL

Bits

Bit Name

Settings

Description

Reset

Access

[7:2]

RESERVED

Reserved.

0x0

EN_IFAMP_Q

Q Channel IF Amplifier Enable (0: off and 1: on). IF output amplifier enable.

0x0

R/W

EN_IFAMP_I

I Channel IF Amplifier Enable (0: off and 1: on). IF output amplifier enable.

0x0

R/W

Address: 0x0080, Reset: 0x00, Name: LO_CTRL

Inv e rt Q Channe l LO Po larity

Inv e rt I Channe l LO Po larity

[ 7 :3 ] RES ERV ED

[ 0 ] RES ERV ED

[ 2 ] SEL_LO D RV_PRED RVQ _PO L ( R/W )

[ 1 ] SEL_LO D RV_PRED RVI_PO L ( R/W )

Table 43. Bit Descriptions for LO_CTRL

Bits

Bit Name

Settings

Description

Reset

Access

[7:3]

RESERVED

Reserved.

0x0

SEL_LODRV_PREDRVQ_POL

Invert Q Channel LO Polarity. Selects the polarity for the Q channel LO path.

0x0

R/W

0: normal polarity.

1: inverted polarity.

SEL_LODRV_PREDRVI_POL

Invert I Channel LO Polarity. Selects the polarity for the I channel LO path.

0x0

R/W

0: normal polarity.

1: inverted polarity.

RESERVED

Reserved.

0x0

R/W

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