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參數資料
| 型號： | DC1620A-G |
| 廠商： | Linear Technology |
| 文件頁數： | 14/38頁 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO 125MSPS LTC2145-14 |
| 軟件下載： | QuikEval II System |
| 設計資源： | DC1620A Design Files DC1620A Schematic |
| 標準包裝： | 1 |
| 系列： | * |
| 相關產品： | DC890B-ND - BOARD USB DATA COLLECTION |
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21
21454314fa
LTC2145-14/
LTC2144-14/LTC2143-14
APPLICATIONS INFORMATION
Figure 5. Recommended Front-End Circuit for Input
Frequencies from 150MHz to 250MHz
Figure 6. Recommended Front-End Circuit for Input
Frequencies Above 250MHz
Amplifier Circuits
Figure 7 shows the analog input being driven by a high
speed differential amplifier. The output of the amplifier is
AC-coupled to the A/D so the amplifier’s output common
mode voltage can be optimally set to minimize distortion.
At very high frequencies an RF gain block will often have
lower distortion than a differential amplifier. If the gain
block is single-ended, then a transformer circuit (Figure 4
to Figure 6) should convert the signal to differential before
driving the A/D.
Figure 4. Recommended Front-End Circuit for Input
Frequencies from 5MHz to 150MHz
Reference
The LTC2145-14/LTC2144-14/LTC2143-14 has an internal
1.25V voltage reference. For a 2V input range using the
internal reference, connect SENSE to VDD. For a 1V input
range using the internal reference, connect SENSE to
ground. For a 2V input range with an external reference,
apply a 1.25V reference voltage to SENSE (Figure 9).
The input range can be adjusted by applying a voltage to
SENSE that is between 0.625V and 1.30V. The input range
will then be 1.6 VSENSE.
The VREF, REFH and REFL pins should be bypassed as
shown in Figure 8. A low inductance 2.2μF interdigitated
capacitor is recommended for the bypass between REFH
and REFL. This type of capacitor is available at a low cost
from multiple suppliers.
25Ω
12Ω
25Ω
50Ω
0.1μF
AIN
+
AIN
–
8.2pF
0.1μF
VCM
ANALOG
INPUT
0.1μF
T1
T2
T1: MA/COM MABA-007159-000000
T2: COILCRAFT WBC1-1TL
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
21454314 F04
LTC2145-14
25Ω
50Ω
0.1μF
AIN
+
AIN
–
1.8pF
0.1μF
VCM
ANALOG
INPUT
0.1μF
T1
T2
T1: MA/COM MABA-007159-000000
T2: COILCRAFT WBC1-1TL
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
21454314 F05
LTC2145-14
25Ω
50Ω
0.1μF
4.7nH
AIN
+
AIN
–
0.1μF
VCM
ANALOG
INPUT
T1: MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
21454314 F06
LTC2145-14
T1
0.1μF
25Ω
200Ω
0.1μF
AIN
+
AIN
–
0.1μF
12pF
VCM
LTC2145-14
21454314 F07
–
+
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1μF
Figure 7. Front-End Circuit Using a High Speed
Differential Amplifier
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| DC1620A-H | 功能描述:BOARD DEMO 105MSPS LTC2144-14 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標準包裝:1 系列:* 其它名稱:MS305720A |
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| DC1620A-K | 功能描述:BOARD DEMO 40MSPS LTC2141-14 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標準包裝:1 系列:* 其它名稱:MS305720A |
| DC1620A-L | 功能描述:BOARD DEMO 25MSPS LTC2140-14 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標準包裝:1 系列:* 其它名稱:MS305720A |
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