參數(shù)資料
型號(hào)： LTC2207IUK-14
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： ADC
英文描述： 14-Bit, 105Msps/80Msps ADCs
中文描述： 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48
封裝： 7 X 7 MM, PLASTIC, MO-220WKKD-2, QFN-48
文件頁(yè)數(shù)： 18/32頁(yè)
文件大小： 1298K
代理商： LTC2207IUK-14
LTC2207-14/LTC2206-14
18
220714614fa
INPUT DRIVE CIRCUITS
Input Filtering
A first order RC lowpass filter at the input of the ADC can
serve two functions: limit the noise from input circuitry and
provide isolation from ADC S/H switching. The LTC2207-
14/LTC2206-14 have a very broadband S/H circuit, DC to
700MHz; it can be used in a wide range of applications;
therefore, it is not possible to provide a single recom-
mended RC filter.
Figures 3, 4a and 4b show three examples of input RC
filtering at three ranges of input frequencies. In general
it is desirable to make the capacitors as large as can be
tolerated–this will help suppress random noise as well
as noise coupled from the digital circuitry. The LTC2207-
14/LTC2206-14 do not require any input filter to achieve
data sheet specifications; however, no filtering will put
more stringent noise requirements on the input drive
circuitry.
Transformer Coupled Circuits
Figure 3 shows the LTC2207-14/LTC2206-14 being driven
by an RF transformer with a center-tapped secondary. The
secondary center tap is DC biased with V
CM
, setting the
ADC input signal at its optimum DC level. Figure 3 shows
a 1:1 turns ratio transformer. Other turns ratios can be
used; however, as the turns ratio increases so does the
impedance seen by the ADC. Source impedance greater
than 50
Ω
can reduce the input bandwidth and increase
high frequency distortion. A disadvantage of using a
transformer is the loss of low frequency response. Most
small RF transformers have poor performance at frequen-
cies below 1MHz.
Center-tapped transformers provide a convenient means
of DC biasing the secondary; however, they often show
poor balance at high input frequencies, resulting in large
2nd order harmonics.
Figure 4a shows transformer coupling using a transmis-
sion line balun transformer. This type of transformer has
much better high frequency response and balance than
flux coupled center tap transformers. Coupling capacitors
are added at the ground and input primary terminals to
allow the secondary terminals to be biased at 1.25V. Figure
4b shows the same circuit with components suitable for
higher input frequencies.
APPLICATIONS INFORMATION
相關(guān)PDF資料
PDF描述
LTC2207UK-14 14-Bit, 105Msps/80Msps ADCs
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LTC2206CUK 16-Bit, 105Msps/80Msps ADCs
LTC2206IUK 16-Bit, 105Msps/80Msps ADCs
LTC2206UK 16-Bit, 105Msps/80Msps ADCs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2207IUK-14#PBF 功能描述:IC ADC 14BIT 105MSPS 48-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- 位數(shù):12 采樣率（每秒）:1.8M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:1.82W 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-LQFP 供應(yīng)商設(shè)備封裝:48-LQFP（7x7） 包裝:管件 輸入數(shù)目和類(lèi)型:2 個(gè)單端，單極
LTC2207IUK-14#TRPBF 功能描述:IC ADC 14BIT 105MSPS 48-QFN RoHS:是 類(lèi)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(lèi)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(lèi)型:1 個(gè)單端，雙極
LTC2207UK 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 105Msps/80Msps ADCs
LTC2207UK-14 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 105Msps/80Msps ADCs
LTC2208 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 14-Bit 250Msps
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