ADF5901

Data Sheet

Rev. A | Page 16 of 26

Power-Up ADC

Bit DB8 provides the power-up bit for the ADC. Setting this bit to

0 performs a power-down of the ADC. Setting this bit to 1

performs a power-up of the ADC.

Power-Up Tx2 Output

Bit DB7 provides the power-up bit for the Tx2 output. Setting

this bit to 0 performs a power-down of the Tx2 output. Setting

this bit to 1 performs a power-up of the Tx2 output. Only one

Tx output can be powered up at any time, either Tx1 (DB6) or

Tx2 (DB7).

Power-Up Tx1 Output

Bit DB6 provides the power-up bit for the Tx1 output. Setting

this bit to 0 performs a power-down of the Tx1 output. Setting

this bit to 1 performs a power-up of the Tx1 output. Only one

Tx output can be powered up at any time, either Tx1 (DB6) or

Tx2 (DB7).

Power-Up LO Output

Bit DB5 provides the power-up bit for the LO output. Setting

this bit to 0 performs a power-down of the LO output. Setting

this bit to 1 performs a power-up of the LO output.

REGISTER 1

Control Bits

With Bits[C5:C1] set to 00001, Register R1 is programmed.

Figure 20 shows the input data format for programming this

register.

Tx Amplitude Calibration Reference Code

Bits[DB12:DB5] set the Tx amplitude calibration reference code

(see Figure 20) for the two Tx outputs during calibration.

Calibrate the output power on the Tx outputs from −20 dBm to

8 dBm by setting the Tx amplitude calibration reference code

(see Figure 7).

Figure 20. Register 1 (R1)

DB31 DB30 DB29 DB28 DB27 DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4

DB3

DB2

DB1

DB0

1

1

1

1

1

1

1

1

CONTROL

BITS

1

1

1

1

0

1

0

1

1

1

1

C4(0) C3(0) C2(0) C1(1)

Tx AMP CAL REF CODE

C5(0)

TAR7 TAR6 TAR5 TAR4 TAR3 TAR2 TAR1 TAR0

TAR7

TAR6

.......... TAR1 TAR0

0

0

..........

0

0

0

0

0

..........

0

1

1

0

0

..........

1

0

2

0

0

..........

1

1

3

.

.

..........

.

.

.

.

.

..........

.

.

.

.

.

..........

.

.

.

1

1

..........

0

0

252

1

1

..........

0

1

253

1

1

..........

1

0

254

1

1

.........

1

1

255

Tx AMP CAL REF CODE

RESERVED