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LTC1745

更新时间： 2023-12-20 18:45:04
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
20页 208K
描述
低噪声、12 位、25Msps ADC

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中文翻译

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LTC1745 数据手册

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LTC1745  
Low Noise,12-Bit, 25Msps ADC  
U
DESCRIPTIO  
FEATURES  
The LTC®1745 is a 25Msps, sampling 12-bit A/D con-  
verter designed for digitizing high frequency, wide dy-  
namic range signals. Pin selectable input ranges of ±1V  
and ±1.6V along with a resistor programmable mode  
allowtheLTC1745’sinputrangetobeoptimizedforawide  
variety of applications.  
■
Sample Rate: 25Msps  
■
72.5dB SNR and 91dB SFDR (3.2V Range)  
■
71dB SNR and 96dB SFDR (2V Range)  
■
No Missing Codes  
Single 5V Supply  
Low Power Dissipation: 380mW  
■
■
■
Selectable Input Ranges: ±1V or ±1.6V  
The LTC1745 is perfect for demanding communications  
applications with AC performance that includes 72.5dB  
SNRand91dBspuriousfreedynamicrange.Ultralowjitter  
of 0.3psRMS allows undersampling with excellent noise  
performance. DC specs include ±1LSB INL maximum and  
±0.75LSB DNL over temperature.  
■
240MHz Full Power Bandwidth S/H  
■
Pin Compatible Family  
25 Msps: LTC1746 (14-Bit), LTC1745 (12-Bit)  
50 Msps: LTC1744 (14-Bit), LTC1743 (12-Bit)  
65 Msps: LTC1742 (14-Bit), LTC1741 (12-Bit)  
80 Msps: LTC1748 (14-Bit), LTC1747 (12-Bit)  
Thedigitalinterfaceiscompatiblewith5V, 3Vand2Vlogic  
systems. The ENC and ENC inputs may be driven differen-  
tiallyfromPECL, GTLandotherlowswinglogicfamiliesor  
from single-ended TTL or CMOS. The low noise, high gain  
ENC and ENC inputs may also be driven by a sinusoidal  
signal without degrading performance. A separate digital  
output power supply can be operated from 0.5V to 5V,  
making it easy to connect directly to low voltage DSPs  
or FIFOs.  
U
APPLICATIO S  
■
Telecommunications  
Medical Imaging  
■
■
Receivers  
Base Stations  
■
■
Spectrum Analysis  
Imaging Systems  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
The TSSOP package with a flow-through pinout simplifies  
the board layout.  
W
BLOCK DIAGRA  
25Msps, 12-Bit ADC with a ±1V Differential Input Range  
OV  
DD  
0.5V TO 5V  
0.1µF  
+
A
0.1µF  
IN  
OF  
±1V  
DIFFERENTIAL  
ANALOG INPUT  
12  
D11  
S/H  
AMP  
12-BIT  
PIPELINED ADC  
OUTPUT  
LATCHES  
•
•
•
–
D0  
CLKOUT  
A
IN  
SENSE  
OGND  
BUFFER  
V
DD  
5V  
RANGE  
SELECT  
1µF  
1µF  
1µF  
DIFF AMP  
V
CM  
GND  
2.35V  
REF  
CONTROL LOGIC  
4.7µF  
1745 BD  
REFLB REFHA  
4.7µF  
REFLA REFHB  
ENC ENC MSBINV  
OE  
0.1µF  
0.1µF  
DIFFERENTIAL  
ENCODE INPUT  
1µF  
1µF  
1745f  
1
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