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MAX2828/MAX2829
Single-/Dual-Band 802.11a/b/g
World-Band Transceiver ICs
Table 6. B1:B0 VCO Sub-Band
Assignments (Read Back Through Lock-
Detect Pin)
Table 7. D10:D9 VCO Sub-Band
Assignments (For Programming Through
SPI)
B1
0
0
1
1
B0
0
1
0
1
VCO FREQUENCY BAND
Band 0 (lowest frequency band)
Band 1
Band 2
Band 3 (highest frequency band)
D10
0
0
1
D9
0
1
0
Band 0
Band 1
Band 2
PROGRAMMED VCO
FREQUENCY BAND
The following steps should be followed:
1
1
Band 3
1) Set D8 = 0 (A3:A0 = 0101) to enable the automatic
Table 8. Comparator-Output Definition
VCO sub-band selection by the FSM.
2) Enable the PLL and VCO if required. If required,
program the divider ratios corresponding to the
A3:A1 = 0000; A3:A1 = 0000;
D3:D0 = 0101 D3:D0 = 0100
RESPONSE
desired channel frequency.
3) Set D7 = 1 (A3:A0 = 0101) to start the FSM. The FSM
should only be started after PLL and VCO are
enabled, or after channel frequency is changed.
4) The VCO sub-band selection and PLL settling time
takes less than approximately 300μs. After the
0
0
1
1
0
1
0
1
Program to a lower sub-band
if VCO is not in Band 0.
No change.
Program to a higher sub-
band if VCO is not in Band 3.
Invalid state, does not occur.
band switching is completed and the PLL has
locked to the correct channel frequency, the FSM
stops automatically.
Every time the channel frequency is programmed or the
PLL+VCO is enabled, the FSM needs to be reset to be
used again for the next time. This reset operation does
not affect the PLL or VCO. To reset the FSM, set D7 = 0
(A3:A0 = 0101).
Every channel frequency maps to some VCO sub-
band. Each VCO sub-band has a digital code, of which
the 2 LSBs (B1:B0) are readable. The B1:B0 code can
be read through pin LD by programming D3:D0 = 0111
(A3:A1 = 0000) for B1, or D3:D0 = 0110 (A3:A1 = 0000)
for B0 (see Table 6).
Manual VCO Sub-Band Selection
For faster settling, the VCO sub-band (B1:B0) can be
directly programmed through the SPI. First, the B1:B0
code for every channel frequency must be determined.
Once this is known, the B1:B0 code is directly pro-
grammed along with the PLL divider values, for the
given channel frequency. The PLL settling time in this
case is approximately 50μs.
Large temperature changes (>+50 ° C) may cause the
channel frequency to move into an adjacent sub-band.
To determine the correct sub-band, two on-chip com-
parators monitor the VCO control voltage (V TUNE ).
These comparator logic outputs can be read through
30
the LD pin to decide whether the frequency sub-band
is correct or needs to be reprogrammed.
The following steps need to be followed to complete
manual PLL frequency acquisition and VCO sub-band
selection:
1) Set D8 = 1 (A3:A0 = 0101) to enable manual VCO
sub-band selection.
2) Enable the PLL and VCO if required. If required,
program the divider ratios corresponding to the
desired channel frequency.
3) Set D10:D9 (A3:A0 = 0101) to program the VCO
frequency sub-band according to Table 7. D10:D9
correspond to the same assignments as B1:B0.
After D10:D9 are programmed, 50μs is required to
allow the PLL to settle.
4) After 50μs of PLL settling time, the comparator out-
puts can be read through pin LD (see Table 8).
5) Based on the comparator outputs, the VCO frequen-
cy sub-band is programmed again according to
Table 8 until the frequency acquisition is achieved.
Large Temperature Changes
If the PLL and VCO are continuously active (i.e., no
reprogramming) and the die temperature changes by
50 ° C (as indicated by the on-chip temperature sensor),
there is a possibility that the PLL may get unlocked due
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相关代理商/技术参数
MAX2829EVKIT+
功能描述:WiFi/802.11开发工具 MAX2829 Eval Kit RoHS:否 制造商:Roving Networks 产品:Evaluation Boards 工具用于评估:RN-171 支持协议:802.11 b/g 频率:2.4 GHz 接口类型:UART 工作电源电压:2 V to 16 V
MAX2829INT
制造商:Maxim Integrated Products 功能描述:2.4GHZ/5GHZ DUAL-BAND 802.11A/G RF TRANSCEIVE - Rail/Tube
MAX2829RD
制造商:Maxim Integrated Products 功能描述:2.4GHZ/5GHZ DUAL-BAND 802.11A/G RF TRANSCEIVE - Rail/Tube
MAX2830E/D
功能描述:射频收发器 2.4GHz to 2.5GHz 802.11g/b 射频收发器 with PA and Rx/Tx/Diversity Switch RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2830E/W
功能描述:射频收发器 2.4GHz to 2.5GHz 802.11g/b 射频收发器 PA and Rx/Tx/Antenna Diversity Switch RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2830E/W-C8P
功能描述:射频收发器 RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2830ETM+
功能描述:射频收发器 2.4-2.5GHz 802.11g/b 射频收发器 RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2830ETM+T
功能描述:射频收发器 2.4-2.5GHz 802.11g/b 射频收发器 RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray