參數(shù)資料
型號: LTC2227CUH#TRPBF
廠商: Linear Technology
文件頁數(shù): 10/28頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 40MSPS SAMPL 32-QFN
標準包裝: 2,500
位數(shù): 12
采樣率(每秒): 40M
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 144mW
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: 32-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 32-QFN 裸露焊盤(5x5)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 1 個單端,雙極; 1 個差分,雙極
LTC2228/LTC2227/LTC2226
18
222876fb
APPLICATIONS INFORMATION
Figure 5 shows a single-ended input circuit. The impedance
seen by the analog inputs should be matched. This circuit
is not recommended if low distortion is required.
The 25Ω resistors and 12pF capacitor on the analog
inputs serve two purposes: isolating the drive circuitry
from the sample-and-hold charging glitches and limiting
the wideband noise at the converter input.
25Ω
12pF
2.2μF
VCM
LTC2228/27/26
222876 F04
+
CM
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
AIN
+
AIN
Figure 4. Differential Drive with an Amplier
25Ω
0.1μF
ANALOG
INPUT
VCM
AIN
+
AIN
1k
12pF
222876 F05
2.2μF
1k
25Ω
0.1μF
LTC2228/27/26
Figure 5. Single-Ended Drive
For input frequencies above 70MHz, the input circuits of
Figure 6, 7 and 8 are recommended. The balun transformer
gives better high frequency response than a ux coupled
center tapped transformer. The coupling capacitors allow
the analog inputs to be DC biased at 1.5V. In Figure 8, the
series inductors are impedance matching elements that
maximize the ADC bandwidth.
25Ω
12Ω
0.1μF
AIN
+
AIN
8pF
2.2μF
VCM
LTC2228/27/26
ANALOG
INPUT
0.1μF
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
222876 F06
Figure 6. Recommended Front-End Circuit for
Input Frequencies Between 70MHz and 170MHz
25Ω
0.1μF
AIN
+
AIN
2.2μF
VCM
LTC2228/27/26
ANALOG
INPUT
0.1μF
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
222876 F07
Figure 7. Recommended Front-End Circuit for
Input Frequencies Between 170MHz and 300MHz
25Ω
0.1μF
AIN
+
AIN
2.2μF
VCM
LTC2228/27/26
ANALOG
INPUT
0.1μF
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
222876 F08
6.8nH
Figure 8. Recommended Front-End Circuit for
Input Frequencies Above 300MHz
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