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參數(shù)資料
| 型號(hào)： | ADS5220PFBT |
| 英文描述： | 12-Bit, 40MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，40MSPS采樣，3.3V的模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 433K |
| 代理商： | ADS5220PFBT |
ADS5220
SBAS261A
11
www.ti.com
ANALOG INPUT DRIVEN BY TRANSFORMER
The ADS5220 can be driven by a transformer, which pro-
vides signal AC-coupling and allows a signal conversion from
single-ended input to differential output, or from single-ended
input to single-ended output. Using a transformer offers a
number of advantages. As a passive component, it does not
add to the total noise and has better harmonics in wide
frequency bands, compared to an op amp driver. By using a
step-up transformer, further signal amplification can be real-
ized; as a result, the signal swing from the source can be
reduced. For transformer selection, it is important to carefully
examine the application requirements and determine the
correct model, the desired impedance ratio, and frequency
characteristics. Furthermore, the appropriate model must
support the targeted distortion level and should not exhibit
any core saturation at full-scale voltage levels. A variety of
miniature RF transformers from different manufacturers (such
as Mini-Circuits, Coilcraft, or Trak) can be selected.
Figure 3 shows a transformer-coupled input configuration of
the ADS5220. The ADS5220 receives a differential AC signal
from the output of the transformer and common-mode volt-
age of +1.5V from the center tap. A source termination
resistor, R
T
, is required,
which may be placed at the primary
or secondary side of the transformer to satisfy the termina-
tion requirements of the source impedance, R
S
. The circuit
also shows the use of an additional RC low-pass filter placed
in series with each converter input to attenuate some of the
wideband noise. The resistor values are typically in the range
of 10
to 50
, and capacitors are in the range of 10pF to
100pF for individual application requirements.
ADS5220
24.9
24.9
22pF
IN
IN
0.1
μ
F
R
S
R
T
1:n
1.7k
1.5k
1.5V
3.3V
FIGURE 3. Transformer-Coupled Differential Input Configura-
tion of ADS5220.
ANALOG INPUT DRIVEN BY AMPLIFIER
The ADS5220 can be driven by an operational amplifier with
DC or AC signal coupling, as shown in Figure 4 and Figure
5. In Figure 4, the THS4503, a differential amplifier, is used
to convert a single-ended input into a differential output with
a gain of 2. The THS4503 provides an output common-mode
voltage set by V
OCM
pin, and is DC-coupled to the input of
ADS5220. A low-pass filter can be created by adding small
capacitors (for example, 10pF) in parallel with the feedback
resistors of the THS4503 as needed for some applications.
0.1
μ
F
10pF
(1)
10pF
(1)
THS4503
24.9
392
187
392
24.9
22pF
215
V
OCM
+5V
–
5V
ADS5220
IN
IN
NOTE: (1) optional.
60.4
50
Source
1.7k
1.5k
1.5V
3.3V
FIGURE 4. Using the THS4503 Differential Amplifier (Gain = 2) to Drive the ADS5220 in a DC-Coupled Configuration.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS5220PFBTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 40MSPS +3.3V RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS5220RGZ | 制造商:BB 制造商全稱:BB 功能描述:12-Bit, 40MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER |
| ADS5221 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:12-Bit, 65MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER |
| ADS5221EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS5221 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS5221PFBR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 65MSPS +3.3V RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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