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LTC2292 数据表(PDF) 18 Page - Linear Technology

部件名 LTC2292
功能描述  Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs
PDF  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2292 数据表(HTML) 18 Page - Linear Technology

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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.
APPLICATIO S I FOR ATIO
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
25Ω
25Ω
12Ω
12Ω
0.1µF
AIN
+
AIN
–
8pF
2.2µF
VCM
ANALOG
INPUT
0.1µF
0.1µF
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
25Ω
25Ω
12pF
2.2µF
VCM
229321 F04
–
–
+
+
CM
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
AIN
+
AIN
–
LTC2293
LTC2292
LTC2291
25Ω
0.1µF
ANALOG
INPUT
VCM
AIN
+
AIN
–
1k
12pF
229321 F05
2.2µF
1k
25Ω
0.1µF
LTC2293
LTC2292
LTC2291
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.
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.
25Ω
25Ω
0.1µF
AIN
+
AIN
–
2.2µF
VCM
ANALOG
INPUT
0.1µF
0.1µF
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
229321 F07
LTC2293
LTC2292
LTC2291
25Ω
25Ω
0.1µF
AIN
+
AIN
–
2.2µF
VCM
ANALOG
INPUT
0.1µF
0.1µF
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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