AIN + AIN
參數(shù)資料
型號: LTC2288CUP#PBF
廠商: Linear Technology
文件頁數(shù): 10/28頁
文件大小: 0K
描述: IC ADC DUAL 10BIT 65MSPS 64QFN
標準包裝: 40
位數(shù): 10
采樣率(每秒): 65M
數(shù)據(jù)接口: 并聯(lián)
轉換器數(shù)目: 2
功率耗散(最大): 450mW
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: 64-WFQFN 裸露焊盤
供應商設備封裝: 64-QFN(9x9)
包裝: 管件
輸入數(shù)目和類型: 2 個單端,雙極; 2 個差分, 雙極
產品目錄頁面: 1349 (CN2011-ZH PDF)
LTC2288/LTC2287/LTC2286
18
228876fa
25
25
0.1
F
AIN
+
AIN
2.2
F
VCM
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
228876 F08
6.8nH
LTC2288
LTC2287
LTC2286
25
25
0.1
F
AIN
+
AIN
2.2
F
VCM
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
228876 F07
LTC2288
LTC2287
LTC2286
25
25
12
12
0.1
F
AIN
+
AIN
8pF
2.2
F
VCM
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
228876 F06
LTC2288
LTC2287
LTC2286
25
25
12pF
2.2
F
VCM
228876 F04
+
CM
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
AIN
+
AIN
LTC2288
LTC2287
LTC2286
Figure 5 shows a single-ended input circuit. The imped-
ance seen by the analog inputs should be matched. This
circuit is not recommended if low distortion is required.
APPLICATIO S I FOR ATIO
WU
UU
Figure 6. Recommended Front End Circuit for
Input Frequencies Between 70MHz and 170MHz
Figure 8. Recommended Front End Circuit for
Input Frequencies Above 300MHz
Figure 7. Recommended Front End Circuit for
Input Frequencies Between 170MHz and 300MHz
Figure 5. Single-Ended Drive
Figure 4. Differential Drive with an Amplifier
25
0.1
F
ANALOG
INPUT
VCM
AIN
+
AIN
1k
12pF
228876 F05
2.2
F
1k
25
0.1
F
LTC2288
LTC2287
LTC2286
The 25
resistorsand12pFcapacitorontheanaloginputs
serve two purposes: isolating the drive circuitry from the
sample-and-hold charging glitches and limiting the
wideband noise at the converter input.
For input frequencies above 70MHz, the input circuits of
Figure 6, 7 and 8 are recommended. The balun trans-
former gives better high frequency response than a flux
coupled center tapped transformer. The coupling capaci-
tors 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.
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