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參數(shù)資料
| 型號： | MAX2112 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete, Direct-Conversion Tuner for DVB-S2 Applications |
| 中文描述： | 完備的直接變頻調(diào)諧器，用于DVB-S2系統(tǒng) |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 313K |
| 代理商： | MAX2112 |
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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 16 summarizes the ADC output bits and the VCO
lock indication. The VCO autoselect routine only selects
a VCO in the “VAS locked” range. This allows room for
a VCO to drift over temperature and remain in a valid
“l(fā)ocked” 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).
Power-Down and Standby Modes
The MAX2112 features normal operating mode, power-
down mode, and standby mode using the I
2
C interface.
Setting a logic-high to the PWDN bit in the Control reg-
ister enables power-down. In this mode, all circuitries
except for the 2-wire-compatible bus are disabled,
allowing for programming of the MAX2112 registers
while in power-down. 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. The various power-down modes
are summarized in Table 17.
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
coupling. Bypass each V
CC
pin to ground with a 1nF
capacitor placed as close as possible to the pin.
Complete, Direct-Conversion
Tuner for DVB-S2 Applications
16
______________________________________________________________________________________
Table 16. ADC Trip Points and Lock Status
ADC[2:0]
000
001
010
101
110
111
LOCK STATUS
Out of lock
Locked
VAS locked
VAS locked
Locked
Out of lock
Table 17. Power-Down Modes
POWER-DOWN CONTROL
CIRCUIT STATES
MODE
PWDN BIT
STBY BIT
SIGNAL
PATH
2-WIRE
INTERFACE
XTAL
DESCRIPTION
Normal
Power-Down
0
1
0
0
On
Off
On
On
On
Off
All circuits active.
2-wire interface is active.
Standby
0
1
Off
On
On
2-wire interface, XTAL, and XTAL
buffer/divider are active.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2112_10 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Complete, Direct-Conversion Tuner for DVB-S2 Applications |
| MAX2112CTI+ | 功能描述:調(diào)諧器 Direct Conv Tuner Tuner for DVB-S2 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| MAX2112CTI+T | 功能描述:調(diào)諧器 Direct Conv Tuner Tuner for DVB-S2 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| MAX2112ETI/GG8 | 制造商:Maxim Integrated Products 功能描述:COMPLETE, DIRECT-CONVERSION TUNER FOR DVB-S2 APPLICATIONS - Rail/Tube |
| MAX2112ETI+ | 功能描述:調(diào)諧器 Direct Conv Tuner Tuner for DVB-S2 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
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