參數(shù)資料
型號(hào)： LTC2205IUK#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 16-Bit, 65Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: -40°C to +85°C
中文描述： 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48
封裝： 7 X 7 MM, LEAD FREE, PLASTIC, MO-220WKKD-2, QFN-48
文件頁(yè)數(shù)： 15/36頁(yè)
文件大?。?/td> 1367K
代理商： LTC2205IUK#PBF
LTC2205/LTC2204
22
22054fc
Transformer Coupled Circuits
Figure 3 shows the LTC2205/LTC2204 being driven by
an RF transformer with a center-tapped secondary. The
secondary center tap is DC biased with VCM, setting the
ADC input signal at its optimum DC level. Figure 3 shows
a 1:1 turns ratio transformer. Other turns ratios can be
used; however, as the turns ratio increases so does the
impedance seen by the ADC. Source impedance greater
than 50Ω can reduce the input bandwidth and increase
high frequency distortion. A disadvantage of using a
transformer is the loss of low frequency response. Most
small RF transformers have poor performance at frequen-
cies below 1MHz.
0.1μF
AIN
+
AIN
–
4.7pF
2.2μF
4.7pF
VCM
LTC2205/
LTC2204
ANALOG
INPUT
0.1μF
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2μF
22054 F04a
5Ω
10Ω
25Ω
10Ω
5Ω
Figure 4a. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 70MHz to 250MHz
0.1μF
AIN
+
AIN
–
2.2μF
2.2pF
VCM
LTC2205/
LTC2204
ANALOG
INPUT
0.1μF
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2μF
22054 F04b
5Ω
25Ω
5Ω
Figure 4b. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 250MHz to 500MHz
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 transmission
line balun transformer. This type of transformer has much
better high frequency response and balance than ux
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
Figure 3. Single-Ended to Differential Conversion Using a Transformer.
Recommended for Input Frequencies from 5MHz to 150MHz
35Ω
5Ω
35Ω
10Ω
5Ω
0.1μF
AIN
+
AIN
–
8.2pF
2.2μF
8.2pF
VCM
T1
T1 = MA/COM ETC1-1T
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2μF
22054 F03
LTC2205/
LTC2204
相關(guān)PDF資料
PDF描述
LTC2205IUK#TRPBF 16-Bit, 65Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: -40°C to +85°C
LTC2205CUK-14#TRPBF 16-Bit, 65Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: 0°C to +70°C
LTC2205IUK-14#TRPBF 16-Bit, 65Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: -40°C to +85°C
LTC2206CUK-14#PBF 16-Bit, 80Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: 0°C to +70°C
LTC2206CUK-14#TRPBF 16-Bit, 80Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: 0°C to +70°C
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2205IUK-TR 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205IUK-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205UK 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205UK-14 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 65Msps ADC
LTC2206 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 20Msps Low Power ADC
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