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MAX2112_V01

更新时间： 2024-02-10 04:41:41
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
19页 1074K
描述
Complete, Direct-Conversion Tuner for DVB-S2 Applications

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中文翻译

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MAX2112_V01 数据手册

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EVALUATION KIT AVAILABLE  
Click here to ask about the production status of specific part numbers.  
MAX2112  
Complete, Direct-Conversion  
Tuner for DVB-S2 Applications  
General Description  
Features  
● 925MHz to 2175MHz Frequency Range  
The MAX2112 low-cost, direct-conversion tuner IC is  
designed for satellite set-top and VSAT applications.  
The IC is intended for 8PSK and Digital Video Broadcast  
(DVB-S2) applications.  
● Monolithic VCO  
• Low Phase Noise: -97dBc/Hz at 10kHz  
• No Calibration Required  
The MAX2112 directly converts the satellite signals  
from the LNB to baseband using a broadband I/Q  
downconverter. The operating frequency range extends  
from 925MHz to 2175MHz.  
● High Dynamic Range: -75dBm to 0dBm  
● Integrated Variable BW LP Filters: 4MHz to 40MHz  
● Single +3.3V ±5% Supply  
The device includes an LNA and an RF variable-gain  
amplifier, I and Q downconverting mixers, and baseband  
lowpass filters with programmable cutoff frequency control  
and digitally controlled baseband variable-gain amplifiers.  
Together, the RF and baseband variable-gain amplifiers  
provide more than 80dB of gain control range. The IC is  
compatible with virtually all DVB-S2 demodulators.  
● Low-Power Standby Mode  
● Address Pin for Multituner Applications  
● Differential I/Q Interface  
2
● I C 2-Wire Serial Interface  
● Very Small 28-Pin TQFN Package  
The MAX2112 includes fully monolithic VCOs, as well  
as a complete fractional-N frequency synthesizer.  
Additionally, an on-chip crystal oscillator is provided  
along with a buffered output for driving additional tuners  
and demodulators. Synthesizer programming and device  
configuration are accomplished with a 2-wire serial inter-  
face. The IC features a VCO autoselect (VAS) function  
that automatically selects the proper VCO. For multituner  
applications, the device can be configured to have one  
of two 2-wire interface addresses. A low-power standby  
mode is available whereupon the signal path is shut  
down while leaving the reference oscillator, digital inter-  
face, and buffer circuits active, providing a method to  
reduce power in single and multituner applications.  
Ordering Information  
PART  
TEMP RANGE  
0°C to +70°C  
-40°C to +85°C  
PIN-PACKAGE  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
MAX2112CTI+  
MAX2112ETI+  
*EP = Exposed paddle.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Pin Configuration/  
Functional Diagram  
28  
27  
26  
25  
24  
23  
22  
ꢀ
The MAX2112 is the most advanced DBS tuner available  
today. The low noise figure eliminates the need for an  
external LNA. A small number of passive components  
are needed to form a complete DVB-S2 RF front-end  
solution. The tuner is available in a very small 28-pin thin  
QFN package.  
21  
IDC+  
VCC_RF2  
VCC_RF1  
1
2
3
DC OFFSET  
CORRECTION  
MAX2112  
INTERFACE LOGIC  
AND CONTROL  
LPF BW  
CONTROL  
IOUT-  
IOUT+  
20  
19  
18  
17  
GND  
RFIN  
GC1  
QOUT-  
QOUT+  
4
5
Applications  
● DirecTV and Dish Network DBS  
● DVB-S2  
● VSATs  
FREQUENCY  
SYNTHESIZER  
DIV2/DIV4  
EP  
VCC_LO  
6
7
16 VCC_DIG  
VCC_VCO  
15  
REFOUT  
8
9
10  
11  
12  
13  
14  
19-0869; Rev 3; 4/20  
1234567...19

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