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參數(shù)資料
| 型號(hào)： | LTC2207IUK |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 105Msps/80Msps ADCs |
| 中文描述： | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| 封裝： | 7 X 7 MM, PLASTIC, MO-220WKKD-2, QFN-48 |
| 文件頁數(shù)： | 19/32頁 |
| 文件大小： | 1489K |
| 代理商： | LTC2207IUK |
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LTC2207/LTC2206
19
22076fa
INPUT DRIVE CIRCUITS
Input Filtering
A first order RC lowpass filter at the input of the ADC
can serve two functions: limit the noise from input cir-
cuitry and provide isolation from ADC S/H switching. The
LTC2207/LTC2206 have a very broadband S/H circuit, DC
to 700MHz; it can be used in a wide range of applications;
therefore, it is not possible to provide a single recom-
mended RC filter.
Figures 3, 4a and 4b show three examples of input RC
filtering at three ranges of input frequencies. In general
it is desirable to make the capacitors as large as can be
tolerated—this will help suppress random noise as well
as noise coupled from the digital circuitry. The LTC2207/
LTC2206 do not require any input filter to achieve data sheet
specifications; however, no filtering will put more stringent
noise requirements on the input drive circuitry.
Transformer Coupled Circuits
Figure 3 shows the LTC2207/LTC2206 being driven by
an RF transformer with a center-tapped secondary. The
secondary center tap is DC biased with V
CM
, 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 50
Ω
can reduce the input bandwidth and increase
0.1
μ
F
A
IN+
A
IN–
4.7pF
2.2
μ
F
4.7pF
4.7pF
V
CM
LTC2207/
LTC2206
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
22076 F04a
5
10
25
25
10
5
Figure 4a. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 100MHz to 250MHz
0.1
μ
F
A
IN+
A
IN–
2.2
μ
F
2.2pF
2.2pF
V
CM
LTC2207/
LTC2206
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
22076 F04b
5
25
25
5
Figure 4b. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 250MHz to 500MHz
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.
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.
Figure 3. Single-Ended to Differential Conversion
Using a Transformer. Recommended for Input
Frequencies from 5MHz to 150MHz
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
LTC2207/
LTC2206
T1
T1 = MA/COM ETC1-1T
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2
μ
F
22076 F03
APPLICATIONS INFORMATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2207UK | 16-Bit, 105Msps/80Msps ADCs |
| LTC2208-14 | 14-Bit, 130Msps ADC |
| LTC2208CUP-14 | 14-Bit, 130Msps ADC |
| LTC2208IUP-14 | 14-Bit, 130Msps ADC |
| LTC2208UP-14 | 14-Bit, 130Msps ADC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2207IUK#PBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 16-bit Parallel 48-Pin QFN EP 制造商:Linear Technology 功能描述:IC ADC 16-BIT 105MSPS 48-QFN 制造商:Linear Technology 功能描述:ADC 16BIT 105MSPS 48QFN 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 105MSPS, QFN-48; Resolution (Bits):16bit; Sampling Rate:105MSPS; Supply Voltage Type:Single; Supply Voltage Min:3.135V; Supply Voltage Max:3.465V; Supply Current:273mA; Digital IC Case Style:QFN; No. of Pins:48 ;RoHS Compliant: Yes |
| LTC2207IUK#TRPBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 16-bit Parallel 48-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC ADC 16BIT 105MSPS 48-QFN |
| LTC2207IUK-14 | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 14-bit Parallel 48-Pin QFN EP |
| LTC2207IUK-14#PBF | 功能描述:IC ADC 14BIT 105MSPS 48-QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- 位數(shù):12 采樣率（每秒）:1.8M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:1.82W 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應(yīng)商設(shè)備封裝:48-LQFP（7x7） 包裝:管件 輸入數(shù)目和類型:2 個(gè)單端，單極 |
| LTC2207IUK-14#TRPBF | 功能描述:IC ADC 14BIT 105MSPS 48-QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極 |
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