ATR2406_06 Datasheet, PDF (10/25 Pages) ATMEL Corporation – Low-IF 2.4-GHz ISM Transceiver

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.
Table 7-1.
Mode
TX
RX
LO Frequencies
f_IF / kHz
864
Channel
C0
C1
...
C93
C94
C0
C1
...
C93
C94
f_ANT / MHz
2401.056
2401.920
...
2481.408
2482.272
2401.056
2401.920
...
2481.408
2482.272
f_VCO / MHz divided by 2
2401.056
2401.920
...
2481.408
2482.272
2401.920
2402.784
...
2482.272
2483.136
7.1 TX Register Setting
The following 16-bit word has to be programmed for TX.
S_MC
S_SC
N
86
27 2779
86
28 2780
...
...
...
89
24 2872
89
25 2873
86
28 2780
86
29 2781
...
...
...
89
25 2873
89
26 2874
MSB
LSB
Data bits
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
1
PA
GFCS
1
RC
MC
SC
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.
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
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.
10 ATR2406
4779L–ISM–09/06