參數(shù)資料
型號: LTC2292IUP
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs
中文描述: DUAL 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
封裝: 9 X 9 MM, PLASTIC, MO-220-WNJR, QFN-64
文件頁數(shù): 18/28頁
文件大?。?/td> 1020K
代理商: LTC2292IUP
LTC2293/LTC2292/LTC2291
18
229321f
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.
APPLICATIOU
W
U
U
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
25
25
12
12
0.1
μ
F
A
IN+
A
IN–
8pF
2.2
μ
F
V
CM
ANALOG
INPUT
0.1
μ
F
0.1
μ
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
229321 F06
LTC2293
LTC2292
LTC2291
Figure 5. Single-Ended Drive
Figure 4. Differential Drive with an Amplifier
25
25
12pF
2.2
μ
F
V
CM
229321 F04
+
+
CM
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
A
IN+
A
IN–
LTC2293
LTC2292
LTC2291
25
0.1
μ
F
ANALOG
INPUT
V
CM
A
IN+
A
IN–
1k
12pF
229321 F05
2.2
μ
F
1k
25
0.1
μ
F
LTC2293
LTC2292
LTC2291
The 25
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.
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.
25
25
0.1
μ
F
A
IN+
A
IN–
2.2
μ
F
V
CM
ANALOG
INPUT
0.1
μ
F
0.1
μ
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
229321 F07
LTC2293
LTC2292
LTC2291
25
25
0.1
μ
F
A
IN+
A
IN–
2.2
μ
F
V
CM
ANALOG
INPUT
0.1
μ
F
0.1
μ
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
229321 F08
6.8nH
6.8nH
LTC2293
LTC2292
LTC2291
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PDF描述
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