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LT5515 PDF预览

LT5515

更新时间: 2023-12-20 18:44:29
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
12页 197K
描述
1.5GHz 至 2.5GHz 直接转换正交解调器

LT5515 数据手册

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LT5515  
1.5GHz to 2.5GHz  
Direct Conversion  
Quadrature Demodulator  
U
DESCRIPTIO  
FEATURES  
Frequency Range: 1.5GHz to 2.5GHz  
The LT®5515 is a 1.5GHz to 2.5GHz direct conversion  
quadrature demodulator optimized for high linearity re-  
ceiver applications. It is suitable for communications  
receivers where an RF signal is directly converted into I  
and Q baseband signals with bandwidth up to 260MHz.  
The LT5515 incorporates balanced I and Q mixers, LO  
buffer amplifiers and a precision, high frequency quadra-  
ture generator.  
High IIP3: 20dBm at 1.9GHz  
High IIP2: 51dBm at 1.9GHz  
Noise Figure: 16.8dB at 1.9GHz  
Conversion Gain: –0.7dB at 1.9GHz  
I/Q Gain Mismatch: 0.3dB  
I/Q Phase Mismatch: 1°  
Shutdown Mode  
16-Lead QFN 4mm × 4mm Package  
In an RF receiver, the high linearity of the LT5515 provides  
excellent spur-free dynamic range, even with fixed gain  
front end amplification. This direct conversion receiver  
can eliminate the need for intermediate frequency (IF)  
signal processing, as well as the corresponding require-  
ments for image filtering and IF filtering. Channel filtering  
can be performed directly at the outputs of the I and Q  
channels. These outputs can interface directly to channel-  
select filters (LPFs) or to a baseband amplifier.  
with Exposed Pad  
U
APPLICATIO S  
Cellular/PCS/UMTS Infrastructure  
High Linearity Direct Conversion I/Q Receiver  
High Linearity I/Q Demodulator  
RF Power Amplifier Linearization  
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
I/Q Output Power, IM2, IM3  
vs RF Input Power  
5V  
BPF  
BPF  
V
CC  
LT5515  
+
+
20  
RF  
LNA  
LPF  
I
OUT  
0
VGA  
P
OUT  
I
OUT  
0°  
20  
40  
60  
+
RF  
LO  
IM3  
DSP  
IM2  
LO INPUT  
ENABLE  
+
LPF  
Q
Q
OUT  
T
= 25°C  
A
0°/90°  
VGA  
P
f
= –5dBm  
LO  
OUT  
= 1901MHz  
= 1899.9MHz  
80  
LO  
RF1  
RF2  
90°  
f
f
LO  
EN  
= 1900.1MHz  
–100  
–16  
–8  
–4  
0
4 8  
–12  
5515 F01  
RF INPUT POWER (dBm)  
5515 • TA01  
Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure  
5515fa  
1

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