10

4779L–ISM–09/06

ATR2406

Table 7-1 shows the LO frequencies for RX and TX in the 2.4-GHz ISM band. There are 95

channels available. Since the ATR2406 supports wideband modulation with 400-kHz devia-

tion, every second channel can be used without overlap in the spectrum.

7.1

TX Register Setting

The following 16-bit word has to be programmed for TX.

Note:

D12 and D13 are only relevant if ramping generator in conjunction with external PA is used, otherwise it can be programmed 0

or 1.

The VRAMP voltage is used to control the output power of an external power amplifier. The

voltage ramp is started with the TX_ON signal.

These bits are only relevant in TX mode.

Table 7-1.

LO Frequencies

Mode

f

Channel

f

f

S

MC

S

SC

N

TX

C0

2401.056

2401.056

86

27

2779

C1

2401.920

2401.920

86

28

2780

...

...

...

...

...

...

C93

2481.408

2481.408

89

24

2872

C94

2482.272

2482.272

89

25

2873

RX

864

C0

2401.056

2401.920

86

28

2780

C1

2401.920

2402.784

86

29

2781

...

...

...

...

...

...

C93

2481.408

2482.272

89

25

2873

C94

2482.272

2483.136

89

26

2874

MSB

LSB

Data bits

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

01

PA

GFCS

1

RC

MC

SC

Table 7-2.

Output Power Settings with Bits D12 - D13

PA (Output Power Settings)

D13

D12

RAMP_OUT (Pin 21)

0

0

1.3V

0

1

1.35V

1

0

1.4V

1

1

1.75V