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LT5568-2

更新时间： 2024-02-02 18:51:44
品牌 Logo 应用领域
凌特 - Linear GSM
页数 文件大小 规格书
16页 300K
描述
GSM/EDGE Optimized, High Linearity Direct Quadrature Modulator

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中文翻译

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LT5568-2 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：QFN针数：16
Reach Compliance Code：compliantECCN代码：EAR99
风险等级：5.64特性阻抗：50 Ω
构造：COMPONENT最大输入功率 (CW)：5 dBm
JESD-609代码：e3调制技术：QUADRAPHASE
最大工作频率：1100 MHz最小工作频率：600 MHz
最高工作温度：85 °C最低工作温度：-40 °C
射频/微波设备类型：MODULATOR端子面层：Matte Tin (Sn)
Base Number Matches：1

LT5568-2 数据手册

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LT5568-2  
GSM/EDGE Optimized,  
High Linearity Direct  
Quadrature Modulator  
U
DESCRIPTIO  
FEATURES  
The LT®5568-2 is a direct I/Q modulator designed for high  
performance wireless applications, including wireless  
infrastructure. It allows direct modulation of an RF signal  
using differential baseband I and Q signals. It supports  
GSM, EDGE, CDMA, CDMA2000 and other systems that  
operate in the 850MHz to 965MHz band. It may be config-  
ured as an image reject upconverting mixer, by applying  
90° phase-shifted signals to the I and Q inputs. The I/Q  
baseband inputs consist of voltage-to-current converters  
that in turn drive double-balanced mixers. The outputs of  
these mixers are summed and applied to an on-chip RF  
transformer, which converts the differential mixer signals  
to a 50Ω single-ended output. The four balanced I and Q  
baseband input ports are intended for DC coupling from a  
source with a common mode voltage level of about 0.5V.  
The LO path consists of an LO buffer with single-ended  
input, and precision quadrature generators that produce  
the LO drive for the mixers. The supply voltage range is  
4.5V to 5.25V.  
■
Optimized Image Rejection for 850MHz to 965MHz  
■
High OIP3: +22.9dBm at 900MHz  
■
Low Output Noise Floor at 5MHz Offset:  
No RF: –159.4dBm/Hz  
P
OUT  
= 4dBm: –153dBm/Hz  
■
Integrated LO Buffer and LO Quadrature Phase  
Generator  
■
■
■
■
■
50Ω AC-Coupled Single-Ended LO and RF Ports  
50Ω DC Interface to Baseband Inputs  
Low Carrier Leakage: –43dBm at 900MHz  
High Image Rejection: –52dBc at 900MHz  
16-Lead 4mm × 4mm QFN Package  
U
APPLICATIO S  
■
Infrastructure Tx for GSM/Cellular Bands  
■
Image Reject Up-Converters for Cellular Bands  
■
Low-Noise Variable Phase-Shifter for 700MHz to  
1050MHz Local Oscillator Signals  
RFID Reader  
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
GSM EVM and Noise  
vs RF Output Power at 900MHz  
850MHz to 965MHz Direct Conversion Transmitter Application  
5
4
–96  
–98  
5V  
100nF  
x 2  
V
CC  
LT5568-2  
RF = 850MHz  
TO 965MHz  
I-DAC  
V-I  
I-CHANNEL  
3
–100  
PA  
NOISE  
0°  
EN  
90°  
BALUN  
2
1
0
–102  
–104  
–106  
Q-CHANNEL  
V-I  
Q-DAC  
EVM  
4
55682 TA01  
BASEBAND  
GENERATOR  
–10 –8 –6 –4 –2  
0
2
6
VCO/SYNTHESIZER  
GSM RF OUTPUT POWER (dBm)  
55682 TA02  
55682f  
1
1234567...16

中文翻译

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