EVAL-ADF7021-NDBEZ Analog Devices Inc, EVAL-ADF7021-NDBEZ Datasheet - Page 47

• Manufacturer Part Number: EVAL-ADF7021-NDBEZ
• Description: 426MHz To 429 MHz, External L
• Manufacturer: Analog Devices Inc
• Type: Transceiver, FSKr

Specifications of EVAL-ADF7021-NDBEZ

• Frequency: 420MHz ~ 440MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ADF7021-N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q5835434A

Battery Voltage/ADCIN/Temperature Sensor Readback
The battery voltage is measured at Pin VDD4. The readback
information is contained in Bit RV1 to Bit RV7. This also
applies to the readback of the voltage at the ADCIN pin and the
temperature sensor. From the readback information, the battery
or ADCIN voltage can be determined using
The temperature can be calculated using
Silicon Revision Readback
The silicon revision readback word is valid without setting any
other registers. The silicon revision word is coded with four
quartets in BCD format. The product code (PC) is coded with
three quartets extending from Bit RV5 to Bit RV16. The revision
code (RC) is coded with one quartet extending from Bit RV1 to
Bit RV4. The product code for the ADF7021-N should read
back as PC = 0x211. The current revision code should read as
RC = 0x1.
V
V
Temp [°C] = −40 + (68.4 − TEMP READBACK) × 9.32
BATTERY
ADCIN
= (ADCIN VOLTAGE READBACK)/42.1
= (BATTERY VOLTAGE READBACK)/21.1
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Filter Bandwidth Calibration Readback
The filter calibration readback word is contained in Bit RV1 to
Bit RV8 (see Figure 58). This readback can be used for manual
filter adjust, thereby avoiding the need to do an IF filter
calibration in some instances. The manual adjust value is
programmed by R5_DB[14:19]. To calculate the manual adjust
based on a filter calibration readback, use the following formula:
The result should be programmed into R5_DB[14:19] as outlined
in the Register 5—IF Filter Setup Register section.
IF_FILTER_ADJUST = FILTER_CAL_READBACK − 128
ADF7021-N