ADF7021-N datasheet(51/64 Pages) AD

Part #	ADF7021-N

Description	High Performance Narrow-Band Transceiver IC

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ADF7021-N

Rev. 0 | Page 51 of 64

REGISTER 2—TRANSMIT MODULATION REGISTER

P6

0

.

1

.

1

P2

0

1

.

1

P1

0

1

0

1

.

1

0 (PA OFF)

1 (–16.0 dBm)

2

3

.

63 (13 dBm)

TFD9

0

.

1

TFD3

0

.

1

...

TFD2

0

1

.

1

TFD1

0

1

0

1

.

1

0

1

2

3

.

511

Tx_FREQUENCY_DEVIATION

POWER_AMPLIFIER

TxDATA_

INVERT

PA_BIAS

PA_RAMP

MODULATION_

SCHEME

ADDRESS

BITS

PE1

0

1

PA_ENABLED

OFF

ON

PA2

0

1

PA1

0

1

0

1

PA_BIAS

5µA

7µA

9µA

11µA

DI2

0

1

DI1

0

1

0

1

TxDATA_INVERT

NORMAL

INVERT CLK

INVERT DATA

INV CLK AND DATA

S3

0

1

S2

0

1

0

1

MODULATION_SCHEME

2FSK

GAUSSIAN 2FSK

3FSK

4FSK

OVERSAMPLED 2FSK

RAISED COSINE 2FSK

RAISED COSINE 3FSK

RAISED COSINE 4FSK

S1

0

1

0

1

0

1

0

1

PR3

0

1

PR2

0

1

0

1

NO RAMP

256 CODES/BIT

128 CODES/BIT

64 CODES/BIT

32 CODES/BIT

16 CODES/BIT

8 CODES/BIT

4 CODES/BIT

PR1

PA_RAMP RATE

0

1

0

1

0

1

0

1

NRC1

0

1

R-COSINE_ALPHA

0.7

0.5 (Default)

fDEV

POWER_

AMPLIFIER

Figure 65. Register 2—Transmit Modulation Register Map

•

The 2FSK/3FSK/4FSK frequency deviation is expressed by

the following:

Direct output

Frequency Deviation [Hz] =

16

2

PFD

ON

CY_DEVIATI

Tx_FREQUEN

×

With RF_DIVIDE_BY_2 (R1_DB18) enabled

Frequency Deviation [Hz] =

16

2

5

.

0

PFD

ON

CY_DEVIATI

Tx_FREQUEN

×

where Tx_FREQUENCY_DEVIATION is set by

R2_DB[19:27] and PFD is the PFD frequency.

•

In the case of 4FSK, there are tones at ±3 × the frequency

deviation and at ±1 × the deviation.

•

The power amplifier (PA) ramps at the programmed rate

(R2_DB[8:10]) until it reaches its programmed level

(R2_DB[13:18]). If the PA is enabled/disabled by the

PA_ENABLE bit (R2_DB7), it ramps up and down. If it is

enabled/disabled by the Tx/Rx bit (R0_DB27), it ramps up

and turns hard off.

•

R-COSINE_ALPHA sets the roll-off factor (alpha) of the

raised cosine data filter to either 0.5 or 0.7. The alpha is set

to 0.5 by default, but the raised cosine filter bandwidth can

be increased to provide less aggressive data filtering by

using an alpha of 0.7.

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