參數(shù)資料
型號： LTC2268CUJ-14#TRPBF
廠商： Linear Technology
文件頁數(shù)： 11/32頁
文件大?。?/td> 0K
描述： IC ADC 14BIT 125MSPS DUAL 40QFN
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 14
采樣率（每秒）： 125M
數(shù)據(jù)接口： Serial LVDS
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 364mW
電壓電源： 單電源
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 40-QFN（6x6）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 2 Differential; 2 Single-Ended
配用： DC1371A-ND - BOARD USB DATA ACQUISITION HS
LTC2268-14/
LTC2267-14/LTC2266-14
19
22687614fa
CONVERTER OPERATION
The LTC2268-14/LTC2267-14/LTC2266-14 are low power,
2-channel, 14-bit, 125Msps/105Msps/80Msps A/D con-
verters that are powered by a single 1.8V supply. The
analog inputs should be driven differentially. The encode
input can be driven differentially for optimal jitter perfor-
mance, or single-ended for lower power consumption.
To minimize the number of data lines the digital outputs
are serial LVDS. Each channel outputs two bits at a time
(2-lane mode). At lower sampling rates there is a one bit
perchanneloption(1-lanemode).Manyadditionalfeatures
canbechosenbyprogrammingthemodecontrolregisters
through a serial SPI port.
applicaTions inForMaTion
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 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
alsolimitswidebandnoisefromthedrivecircuitry.Figure 3
shows an example of an input RC filter. The RC component
values should be chosen based on the application’s input
frequency.
Figure 2. Equivalent Input Circuit. Only One
of the Two Analog Channels is Shown
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTC2268-14
AIN+
226814 F02
CSAMPLE
3.5pF
VDD
AIN–
ENC–
ENC+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2268-14
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226814 F03
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LTC2268IUJ-12#PBF 制造商:Linear Technology 功能描述:IC ADC 12BIT 125MSPS QFN-40
LTC2268IUJ-12#TRPBF 功能描述:IC ADC 12BIT 125MSPS DUAL 40QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極
LTC2268IUJ-12PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 125Msps/105Msps/ 80Msps Low Power Dual ADCs
LTC2268IUJ-12TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 125Msps/105Msps/ 80Msps Low Power Dual ADCs
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