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参数资料
| 型号： | MAX2112EVKIT+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX2112 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 调谐器 |
| 频率： | 925MHz ~ 2.175GHz |
| 适用于相关产品： | MAX2112 |
| 已供物品： | 板 |
MAX2112
Complete, Direct-Conversion
Tuner for DVB-S2 Applications
Alternatively, the MAX2112 can be set to autonomously
choose a VCO by setting the VAS bit in the VCO regis-
ter to logic-high. The VAS routine is initiated once the
F-Divider LSB register word (REG 5) is loaded.
In the event that only the N-divider register or
F-divider MSB word is changed, the F-divider LSB
word must also be loaded last to initiate the VCO
autoselect function. The VCO value programmed in the
VCO[4:0] register serves as the starting point for the auto-
matic VCO selection process.
During the selection process, the VASE bit in the Status
Byte-1 register is cleared to indicate the autoselection
function is active. Upon successful completion, bits VASE
and VASA are set and the VCO selected is reported in the
Status Byte-2 register (see Table 15). If the search is
unsuccessful, VASA is cleared and VASE is set. This indi-
cates that searching has ended but no good VCO has
been found, and occurs when trying to tune to a frequen-
cy outside the VCO’s specified frequency range.
Refer to the MAX2112/MAX2120 VCO Autoselect (VAS)
Application Note for more information.
3-Bit ADC
The MAX2112 has an internal 3-bit ADC connected to
the VCO tune pin (VTUNE). This ADC can be used for
checking the lock status of the VCOs.
Table 17 summarizes the ADC output bits and the VCO
lock indication. The VCO autoselect routine only selects
Table 17. ADC Trip Points and Lock Status
a VCO in the “VAS locked” range. This allows room for
a VCO to drift over temperature and remain in a valid
“locked” range.
The ADC must first be enabled by setting the ADE bit in
the VCO register. The ADC reading is latched by a sub-
sequent programming of the ADC latch bit (ADL = 1).
The ADC value is reported in the Status Byte-2 register
(see Table 15).
Standby Mode
The MAX2112 features normal operating mode and
standby mode using the I 2 C interface. Setting a logic-
high to the STBY bit in the Control register puts the
device into standby mode, during which only the 2-
wire-compatible bus, the crystal oscillator, the XTAL
buffer, and the XTAL buffer divider are active.
In all cases, register settings loaded prior to entering
shutdown are saved upon transition back to active
mode. Default register values are provided for the
user’s convenience only. It is the user’s responsibility to
load all the registers no sooner than 100μs after the
device is powered up.
Layout Considerations
The MAX2112 EV kit serves as a guide for PCB layout.
Keep RF signal lines as short as possible to minimize
losses and radiation. Use controlled impedance on all
high-frequency traces. For proper operation, the
exposed paddle must be soldered evenly to the board’s
ground plane. Use abundant vias beneath the exposed
paddle for maximum heat dissipation. Use abundant
ground vias between RF traces to minimize undesired
ADC[2:0]
000
LOCK STATUS
Out of lock
coupling. Bypass each V CC pin to ground with a 1nF
capacitor placed as close as possible to the pin.
16
001
010
101
110
111
Locked
VAS locked
VAS locked
Locked
Out of lock
Maxim Integrated
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| MAX2112EVKIT+ | 功能描述:射频开发工具 MAX2112 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX2113EVKIT | 功能描述:射频开发工具 MAX2113 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX2113UGH | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX2114 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:DBS Direct Downconverter |
| MAX2114UGH | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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