ADF5902 datasheet(32/39 Pages) AD

32 / 39 page

ADF5902

Data Sheet

Rev. 0 | Page 32 of 39

RECALIBRATION SEQUENCE

The ADF5902 can be recalibrated after the initialization sequence

is complete and the device is powered up. The recalibration

sequence must be run for every 10°C temperature change. The

temperature can be monitored using the temperature sensor

(see the Temperature Sensor section).

Table 8. Recalibration Sequence

Step Number from

Initialization Sequence

Hexadecimal Code

Description

0x800FE500

Turn Tx1 off, Tx2 off and LO off

0x2A20B929

Reserved

0x01800827

PFD = 50 MHz, CLK1 = 2048

0x00000006

Set the LSB FRAC = 0

0x01E38005

N = 241.175

0x00000004

Set the ATEST pin to high impedance

0x01897803

I/O level to 3.3 V, CAL_BUSY to MUXOUT

0x00020642

Set ADC clock to 1 MHz

0xFFF7FFE1

Set the transmitter amplitude level

0x800FE700

Start the VCO frequency calibration

Delay of 1200 μs

0x800FE560

Turn Tx1 on, Tx2 off, and LO on

0x800FED60

Tx1 amplitude calibration

Delay of 500 μs

0x800FE5A0

Turn Tx1 off, Tx2 on, and LO on

0x800FF5A0

Tx2 amplitude calibration

Delay of 500 μs

0x2800B929

Reserved

0x0100A027

PFD set to 100 MHz, CLK_DIV1 = 10

0x00000006

Set the LSB FRAC = 0

0x00F04005

Set INT word to 120, set MSB FRAC = 512; lock to

24.025 GHz

0x00002004

Ramp down to MUXOUT

0x0189F803

I/O voltage level to 3.3 V

Delay of 100 μs

R11

0x0000010B

Select ramp mode

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