參數資料
型號： LTC2265IUJ-12#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： PROPRIETARY METHOD ADC, QCC40
封裝： 6 X 6 MM, LEAD FREE, PLASTIC, QFN-40
文件頁數： 13/34頁
文件大?。?/td> 1231K
代理商： LTC2265IUJ-12#PBF
20
22654312fb
LTC2265-12/
LTC2264-12/LTC2263-12
CONVERTER OPERATION
The LTC2265-12/LTC2264-12/LTC2263-12 are low power,
2-channel, 12-bit, 65Msps/40Msps/25Msps A/D convert-
ers that are powered by a single 1.8V supply. The analog
inputsshouldbedrivendifferentially.Theencodeinputcan
be driven differentially for optimal jitter performance, or
single-ended for lower power consumption. To minimize
thenumberofdatalines,thedigitaloutputsareserialLVDS.
Each channel outputs two bits at a time (2-lane mode) or
one bit at a time (1-lane mode). Many additional features
canbechosenbyprogrammingthemodecontrolregisters
through a serial SPI port.
ANALOG INPUT
The analog inputs are differential CMOS sample-and-hold
circuits(Figure2).Theinputsshouldbedrivendifferentially
around a common mode voltage set by the VCM1 or VCM2
output pins, which are nominally VDD/2. For the 2V input
range, the inputs should swing from VCM – 0.5V to VCM
+ 0.5V. There should be a 180° phase difference between
the inputs.
The two channels are simultaneously sampled by a
shared encode circuit (Figure 2).
INPUT DRIVE CIRCUITS
Input Filtering
If possible, there should be an RC lowpass filter right
at the analog inputs. This lowpass filter isolates the
drive circuitry from the A/D sample-and-hold switching
and limits wideband noise from the drive circuitry.
Figure 3 shows an example of an input RC filter. The
RC component values should be chosen based on the
application’s input frequency.
APPLICATIONS INFORMATION
Transformer Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with a center-tapped secondary. The center
tap is biased with VCM, setting the A/D input at its opti-
mal DC level. At higher input frequencies a transmission
line balun transformer (Figures 4 to 6) has better balance,
resulting in lower A/D distortion.
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTC2265-12
AIN+
226512 F02
CSAMPLE
3.5pF
VDD
AIN–
ENC–
ENC+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10
Figure 2. Equivalent Input Circuit. Only One of
the Two Analog Channels Is Shown.
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2265-12
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226512 F03
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
相關PDF資料
PDF描述
LTC2265CUJ-12#TRPBF PROPRIETARY METHOD ADC, QCC40
LTC2263CUJ-12#PBF PROPRIETARY METHOD ADC, QCC40
LTC2264CUJ-12#TRPBF PROPRIETARY METHOD ADC, QCC40
LTC2263CUJ-12#TRPBF PROPRIETARY METHOD ADC, QCC40
LTC2264IUJ-12#PBF PROPRIETARY METHOD ADC, QCC40
相關代理商/技術參數
參數描述
LTC2265IUJ-12TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 65Msps/40Msps/25Msps Low Power Dual ADCs
LTC2265IUJ-14 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 65Msps/40Msps/25Msps Low Power Dual ADCs
LTC2265IUJ-14#PBF 功能描述:IC ADC 14BIT SER/PAR 65M 40-QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
LTC2265IUJ-14#TRPBF 功能描述:IC ADC 14BIT SER/PAR 65M 40-QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極
LTC2265IUJ-14PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 65Msps/40Msps/25Msps Low Power Dual ADCs
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