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ADF4602

Rev. 0 | Page 27 of 36

Table 12. Transmitter User Registers

Bit

Bit Name

Description

21, A1

[12:11]

test_I/swap_I

These bits allow various options on the I inputs as detailed in the following table:

Bits

Function

Normal operation

Swap I differential inputs for ease of PCB routing to DAC

Zero input on I inputs

DC offset applied to I inputs; creates large carrier at RF

[10:9]

test_Q/swap_Q

These bits allow various options on the Q inputs as detailed in the table below:

Bits

Function

Normal operation

Swap Q differential inputs for ease of PCB routing to DAC

Zero input on Q inputs

DC offset applied to Q inputs: creates large carrier at RF

[8:7]

gain_blanksel

During a transmit gain change, some spectral splatter may occur at the output of the transmitter.

These bits allow the input baseband signal at the input to the low-pass filter to be blanked for a

short period, to reduce the spectral splatter observed during the gain change.

gain_blanksel[8:7]

Operation

Default setting; no blanking

230 ns blanking

540 ns blanking

850 ns blanking

cmmod

This bit adjusts the internal modulator common-mode setting. It should be set to 0. Setting this bit

to 1 results in reduced power consumption but degrades transmit linearity.

[5:0]

vcm_sat_thres

This bit should be set to 0x1F for normal operation.

22, A1

15:

dacgpo_owen

Setting this bit high allows the user to have manual control over DAC2 and GPO1 to GPO4.

[14:11]

gpo_ow

These bits allow manual control of GPO 1 to GPO 4. Bit dacgpo_owen must be set to 1 to allow this

mode of operation. Each bit controls one of the GPOs as per the following table. This allows all

possible permutations of GPO output combinations.

gpo_ow[14 :11]1

Mode

XXX1

GPO1 high

XX1X

GPO2 high

X1XX

GPO3 high

1XXX

GPO4 high

[10:5]

padac2_ow

These bits allow manual control of DAC2. Bit dacgpo_owen must be set to 1 to allow this mode of

operation.

[4:0]

padac1

These bits control DAC1.

26, A1

Write

[15:0]

txfreq

These bits set the transmitter synthesizer frequency in 50 kHz steps from 0 MHz to 3276.75 MHz.

For the high bands, this is equal to the channel frequency, and for the low bands it is 2× the

channel frequency.

For example:

Bit 15 to Bit 0 (Hex)

HB Synthesizer Frequency

LB synthesizer Frequency

0xA730

2140 MHz

1070 MHz

0xA988

2170 MHz

1085 MHz

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