參數(shù)資料
型號: LTC2205UK-14
廠商: Linear Technology Corporation
英文描述: 14-Bit, 65Msps ADC
中文描述: 14位,型號各有不同的模數(shù)轉(zhuǎn)換器
文件頁數(shù): 17/28頁
文件大?。?/td> 1563K
代理商: LTC2205UK-14
LTC2205-14
17
220514fa
Figure 3. Single-Ended to Differential Conversion Using a Transformer.
Recommended for Input Frequencies from 5MHz to 150MHz
Figure 4a. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 150MHz to 250MHz
Figure 4b. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 250MHz to 500MHz
Direct Coupled Circuits
Figure 5 demonstrates the use of a differential amplifier to
convert a single ended input signal into a differential input
signal. The advantage of this method is that it provides
low frequency input response; however, the limited gain
bandwidth of any op amp or closed-loop amplifier will de-
grade the ADC SFDR at high input frequencies. Additionally,
wideband op amps or differential amplifiers tend to have
high noise. As a result, the SNR will be degraded unless
the noise bandwidth is limited prior to the ADC input.
Center-tapped transformers provide a convenient means
of DC biasing the secondary; however, they often show
poor balance at high input frequencies, resulting in large
2nd order harmonics.
Figure 4a shows transformer coupling using a transmis-
sion line balun transformer. This type of transformer has
much better high frequency response and balance than
flux coupled center tap transformers. Coupling capacitors
are added at the ground and input primary terminals to
allow the secondary terminals to be biased at 1.25V. Figure
4b shows the same circuit with components suitable for
higher input frequencies.
APPLICATIONS INFORMATION
35
5
35
10
10
5
5
0.1
μ
F
A
IN+
A
IN–
8.2pF
2.2
μ
F
8.2pF
8.2pF
V
CM
T1
T1 = MA/COM ETC1-1T
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2
μ
F
220514 F03
LTC2205-14
0.1
μ
F
A
IN+
A
IN–
4.7pF
2.2
μ
F
4.7pF
4.7pF
V
CM
LTC2205-14
ANALOG
INPUT
0.1mF
0.1mF
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2mF
220514 F04a
5
10
25
25
10
5
0.1
μ
F
A
IN+
A
IN–
2.2
μ
F
2.2pF
2.2pF
V
CM
LTC2205-14
ANALOG
INPUT
0.1
μ
F
0.1
μ
F
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2
μ
F
22054 F04b
5
25
25
5
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