ADF7020

Preliminary Technical Data

Rev. PrH | Page 34 of 40

REGISTER 7—READBACK SETUP REGISTER

AD1

AD2

RB1

RB2

RB3

DB8

DB7

DB6

DB5

DB4

DB3

DB2

C2(1)

C1(1)

CONTROL

BITS

DB1

DB0

C3(1)

C4(0)

READBACK

SELECT

ADC

MODE

AD2

0

0

1

1

AD1

0

1

0

1

ADC MODE

MEASURE RSSI

BATTERY VOLTAGE

TEMP SENSOR

TO EXTERNAL PIN

RB2

0

0

1

1

RB1

0

1

0

1

READBACK MODE

AFC WORD

ADC OUTPUT

FILTER CAL

SILICON REV

RB3

0

1

READBACK

DISABLED

ENABLED

Figure 35.

Notes:

1.

Readback of the measured RSSI value is valid only in Rx mode. Readback of the battery voltage, the temperature sensor, and the voltage at the external pin is not

available in Rx mode, if the ASK demodulator is active or if AGC is enabled.

2.

Readback of the ADC value is valid in Tx mode only if the log amp/RSSI has not been disabled through the power-down bits R8_DB10. The log amp/RSSI section is

active per default upon enabling Tx mode.

3.

Readback of the AFC word is valid in Rx mode only if either the linear demodulator or the correlator/demodulator is active.

4.

See the Readback Format section for more information.