ADRF6821 datasheet(43/61 Pages) AD

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Data Sheet

ADRF6821

Rev. A | Page 43 of 61

Address: 0x003A, Reset: 0x20, Name: DEMOD_SPARES

Frequency Selec tiv e Gain Adjus tm ent

for the Mix er

Q Mixe r Gain Ad jus tm e nt

I Mixe r Gain Ad justm e nt

[ 7 :6 ] RES ERV ED

[ 1 :0 ] M IX ER_GAIN _P EAK ( R/W )

[ 5 :4 ] Q _M IX ER_GAIN _AD J ( R/W )

[ 3 :2 ] I_M IX ER_GAIN _AD J ( R/W )

Table 34. Bit Descriptions for DEMOD_SPARES

Bits

Bit Name

Settings

Description

Reset

Access

[7:6]

RESERVED

Reserved.

0x0

[5:4]

Q_MIXER_GAIN_ADJ

Q Mixer Gain Adjustment. Allows the individual mixer gains to be adjusted in

0.2 dB steps (gains are adjusted relative to each other) to improve I/Q

balance.

0x0

R/W

[3:2]

I_MIXER_GAIN_ADJ

I Mixer Gain Adjustment. Allows the individual mixer gains to be adjusted in

0.2 dB steps (gains are adjusted relative to each other) to improve I/Q

balance.

0x0

R/W

[1:0]

MIXER_GAIN_PEAK

Frequency Selective Gain Adjustment for the Mixer. It compensates for the

frequency dependent loss in RF front end. 0 for no compensation, and

3 (decimal) for maximum compensation.

0x0

R/W

Address: 0x0040, Reset: 0x00, Name: DEMOD_DRIVER_COM_CTRL

I Channel Mix er Com m on-Mode Control

Enable (0:off 1:on)

Q Channel LO Driv er Com m on-Mode

Control Enable (0:off 1:on)

Q Channel Mix er Com m on-Mode Control

Enable (0:off 1:on)

I Channel LO Driv er Com m on-Mode Control

Enable (0:off 1:on)

[ 7 :4 ] RES ERV ED

[ 0 ] EN _ICM O BIAS _I ( R/W )

[ 3 ] EN _ICM LO BIAS _Q ( R/W )

[ 1 ] EN _ICM O BIAS _Q ( R/W )

[ 2 ] EN _ICM LO BIAS _I ( R/W )

Table 35. Bit Descriptions for DEMOD_DRIVER_COM_CTRL

Bits

Bit Name

Settings

Description

Reset

Access

[7:4]

RESERVED

Reserved.

0x0

EN_ICMLOBIAS_Q

Q Channel LO Driver Common-Mode Control Enable (0: off and 1: on). LO path

driver LDO bias current. This must be enabled to turn on the LDO for the LO

driver block which interfaces to the mixer.

0x0

R/W

EN_ICMLOBIAS_I

I Channel LO Driver Common-Mode Control Enable (0: off and 1: on). LO path

driver LDO bias current. This must be enabled to turn on the LDO for the LO

driver block which interfaces to the mixer.

0x0

R/W

EN_ICMOBIAS_Q

Q Channel Mixer Common-Mode Control Enable (0: off and 1: on). Mixer LDO

bias current. This must be enabled to turn on the LDO for the mixer. This is

required whenever the mixer is enabled.

0x0

R/W

EN_ICMOBIAS_I

I Channel Mixer Common-Mode Control Enable (0: off and 1: on). Mixer LDO

bias current. This must be enabled to turn on the LDO for the mixer. This is

required whenever the mixer is enabled.

0x0

R/W

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