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TRF1112_07

更新时间： 2024-09-23 03:26:31
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德州仪器 - TI /
页数 文件大小 规格书
25页 1138K
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Dual VCO/PLL Synthesizer With IF Down-Conversion

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TRF1112  
TRF1212  
www.ti.com  
SLWS175A–APRIL 2005–REVISED DECEMBER 2005  
Dual VCO/PLL Synthesizer With IF Down-Conversion  
The TRF1112 / TRF1212 are designed to function as  
part of Texas Instruments 2.5-GHz and 3.5-GHz  
complete radio chipsets, respectively. In the chipset,  
two chips function together to double-down convert  
RF frequencies to an IF frequency that is suitable for  
most baseband modem ADCs. The TRF1112 /  
TRF1212 performs the second down conversion from  
the first IF frequency (480 MHz typical) to a final IF  
frequency (20-50 MHz). The radio chipset features  
sufficient linearity, phase noise and dynamic range to  
work in single carrier or multi-carrier, line-of-sight or  
non-line-of-sight, IEEE standard 802.16, BWIF, or  
proprietary systems. Due to the modular nature of the  
chipset, it is ideal for use in systems that employ  
transmit or receive diversity.  
FEATURES  
•
Low Phase Noise  
•
High Dynamic Range Image-Reject  
Downconverter  
•
•
Selectable IF Filters  
Internal or External AGC Control With Peak  
Detector and Voltage Reference  
•
•
•
Analog Gain Control Range  
Direct Interface to A/D  
Dual VCO/PLL With On-Chip Resonator For  
Double Down-Conversion Architecture  
KEY SPECIFICATIONS  
•
S-Band LO Frequency Range:  
– TRF1112: 1700 to 2400 MHz  
– TRF1212: 2400 MHz to 3550 MHz  
TRF1112 / TRF1212 PIN OUT  
LPCC−48 PACKAGE  
(TOP VIEW)  
•
UHF LO Frequency Range: 325 MHz to 460  
MHz  
•
•
•
Phase Noise is 0.5 RMS Typ 100 Hz to 1 MHz  
Rx Noise Figure of 5 dB, Typ  
UHF LO Tuning Step Size of 125 kHz With 18  
MHz Reference  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
1
CP2O  
LD1  
AGCO  
IFBPB  
IF1IP  
•
Typical Gain of 90 dB, Including 15-dB Loss  
IF2 SAW Filter  
Input Third Order Intercept Point > 0 dBm  
Input 1-dB Compression Point > –10 dBm  
Gain Control Range of 90 dB Typ  
2
3
LF1  
4
EN  
•
•
•
IF1IN  
5
FRBP  
VCCD1  
FR  
VCCA  
VCCB  
VERR  
VREF  
VFB  
6
7
8
VCCD2  
CLK  
9
DESCRIPTION  
10  
11  
12  
DATA  
LF2  
VCCC  
IF2AOP  
IF2AON  
The TRF1112  
/ TRF1212 are UHF-VHF down  
converters with integrated UHF and S-band  
frequency synthesizers for radio applications in the  
2GHz to 4GHz range. The device integrates an  
image reject mixer, IF gain blocks, automatic gain  
control (AGC), and two complete phase locked loop  
(PLL) circuits including: VCOs, resonator circuit,  
varactors, dividers, and phase detectors.  
LD2  
BLOCK DIAGRAM  
The detailed block diagram and the pin-out of the  
ASIC are shown in Figure 1 and the Terminal  
Functions table.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2005, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
1234567...25

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