Preliminary Technical Data

ADF7020

Rev. PrH | Page 39 of 40

REGISTER 13—OFFSET REMOVAL AND SIGNAL GAIN REGISTER

KP

KI

CONTROL

BITS

PULSE

EXTENSION

TEST DAC GAIN

TEST DAC OFFSET REMOVAL

PE4

0

0

0

.

.

.

1

PE3

0

0

0

.

.

.

1

PE2

0

0

1

.

.

.

1

PULSE EXTENSION

NORMAL PULSE WIDTH

2 × PULSE WIDTH

3 × PULSE WIDTH

.

.

.

16 × PULSE WIDTH

PE1

0

1

0

.

.

.

1

Figure 41.

Note:

1.

Because the linear demodulator’s output is proportional to frequency, it usually consists of an offset combined with a relatively low signal. The offset can be

removed, up to a maximum of 1.0 and gained to use the full dynamic range of the DAC:

DAC_input = (2^ Test_DAC_Gain) × (Signal − Test_DAC_Offset_Removal/4096)