Data Sheet

ADF5904

INITIALIZATION SEQUENCE

After powering up the device, administer the initialization

sequence in Table 6 to set the register with the code to configure

the device.

Table 6. Initialization Sequence

Step

Register

Hex Code

Description

1

R3

0x00000003

Reserved

2

R2

0x00020406

Temperature sensor to ATEST

3

R1

0x20001499

Configure Channel 1

4

R1

0x40001499

Configure Channel 2

5

R1

0x60001499

Configure Channel 3

6

R1

0x80001499

Configure Channel 4

7

R1

0xA0000019

Configure LO

8

R0

0x80007CA0

Power up

TEMPERATURE SENSOR

The on-chip temperature sensor of the ADF5904 is accessed on

the ATEST pin. The temperature sensor operates over the full

operating temperature range of −40°C to +105°C. To improve

accuracy, conduct a one-point calibration at room temperature

and store the result in the external memory. Convert the ATEST

voltage to temperature by using the following equation:

where:

Rev. 0 | Page 13 of 15