ADF7021 datasheet(54/64 Pages) AD

54 / 64 page

ADF7021

Data Sheet

Rev. B | Page 54 of 64

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

AD1

ADC MODE

MEASURE RSSI

BATTERY VOLTAGE

TEMP SENSOR

TO EXTERNAL PIN

RB2

RB1

READBACK MODE

AFC WORD

ADC OUTPUT

FILTER CAL

SILICON REV

RB3

READBACK

DISABLED

ENABLED

Figure 69. Register 7—Readback Setup Register Map

Readback of the measured RSSI value is valid only in Rx mode.

Readback of the battery voltage, temperature sensor, or voltage

at the external pin is not valid in Rx mode.

To read back the battery voltage, the temperature sensor, or the

voltage at the external pin in Tx mode, users should first power

up the ADC using R8_DB8 because it is turned off by default in

Tx mode to save power.

For AFC readback, use the following equations (see the

Readback Format section):

FREQ RB [Hz] = (AFC_READBACK × DEMOD CLK)/218

VBATTERY = BATTERY_VOLTAGE_READBACK/21.1

VADCIN = ADCIN_VOLTAGE_READBACK/42.1

Temperature [°C] = −40 + (68.4 − TEMP_READBACK) × 9.32

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