MAX2831ETM+T Maxim Integrated Products, MAX2831ETM+T Datasheet - Page 25

• Manufacturer Part Number: MAX2831ETM+T
• Description: RF Transceiver 2.4GHz to 2.5GHz, 80 2.11g RF Transceiver
• Manufacturer: Maxim Integrated Products

Specifications of MAX2831ETM+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The desired integer and fractional divider ratios can be
calculated by dividing the RF frequency (f
For nominal 802.11g/b operation, a 40MHz reference
oscillator is divided by 2 to generate a 20MHz compari-
son frequency (f
used when calculating divider ratios supporting various
reference and comparison frequencies:
Table 11. Integer Divider Register (A3:A0 = 0011)
Table 12. Fractional Divider Register (A3:A0 = 0100)
Table 13. IEEE 802.11g/b Divider-Ratio Programming Words
(MHz)
2412
2417
2422
2427
2432
2437
2442
2447
2452
2457
2462
2467
2472
2484
f
Calculating Integer and Fractional Divider Ratios
D13:D8
D13:D0
RF
D7:D0
BIT
BIT
(f
RF
RECOMMENDED
RECOMMENDED
COMP
11011001100110
120.85
121.35
121.85
122.35
122.85
123.35
120.6
121.1
121.6
122.1
122.6
123.1
123.6
124.2
______________________________________________________________________________________
/ f
01111001
COMP
00000
). The following method can be
)
RF Transceivers with Integrated PA
A3:A0 = 0011, D7:D0
INTEGER DIVIDER
6 LSBs of 20-Bit Fractional Portion of Main Divider
14 MSBs of 20-Bit Fractional Portion of Main Divider
8-Bit Integer Portion of Main Divider. Programmable from 64 to 255.
0111 1000b
0111 1000b
0111 1001b
0111 1001b
0111 1001b
0111 1001b
0111 1010b
0111 1010b
0111 1010b
0111 1010b
0111 1011b
0111 1011b
0111 1011b
0111 1100b
RF
) by f
2.4GHz to 2.5GHz 802.11g/b
COMP
.
A3:A0 = 0100, D13:D0
See Table 13 for integer and fractional divider ratios for
802.11g/b systems using a 20MHz comparison frequency.
Fractional Divider = 0.85 x (2
LO Frequency Divider = f
Integer Divider = 121 (d) = 0111 1001 (binary)
0CCCh
2666h
3666h
0666h
1666h
2666h
3666h
0666h
1666h
2666h
3666h
0666h
1666h
2666h
DESCRIPTION
DESCRIPTION
= 1101 1001 1001 1001 1001
FRACTIONAL DIVIDER
20MHz = 121.85
RF
20
A3:A0 = 0011, D13:D8
/ f
- 1) = 891289 (decimal)
COMP
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
1Ah
33h
= 2437MHz /
25