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參數(shù)資料
| 型號： | ADS5421 |
| 英文描述： | PLUG, PCB, VERTICAL, 20WAY; Connector type:Wire-to-Board; Gender:Plug; Ways, No. of:20; Pitch, lead:1.27mm; Termination method:Solder; Material, contact:Phosphor Bronze; Plating, contact:Gold over Nickel; Rows, No. of:2; Pitch:0.05"; RoHS Compliant: Yes |
| 中文描述： | 14位，40MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大小： | 395K |
| 代理商： | ADS5421 |
ADS5421
SBAS237D
11
www.ti.com
FIGURE 4. Driving the ADS5421 with a Low-Distortion IF Amplifier and a Transformer Suited for IF Sampling Applications.
ADS5421
R
IN
R
S
R
IN
C
IN
0.1
μ
F
2.2
μ
F
R
T
1:n
IF
Amplifier
V
IN
(IF)
IN
IN
CM
Optional
Bandpass
Filter
+
+5V
NOTE: Supply bypassing not shown.
XFR
TRANSFORMER-COUPLED, SINGLE-ENDED-TO-
DIFFERENTIAL CONFIGURATION
For applications in which the input frequency is limited to
approximately 10MHz (e.g., baseband), a high-speed opera-
tional amplifier may be used. The OPA847 is configured for the
noninverting mode; this amplifies the single-ended input signal
and drives the primary of a RF transformer (see Figure 5). To
maintain the very low distortion performance of the OPA847, it
may be advantageous to set the full-scale input range of the
ADS5421 to 3Vp-p or 2Vp-p (refer to the Reference section for
details on selecting the converter’s full-scale range).
The circuit also shows the use of an additional RC low-pass
filter placed in series with each converter input. This optional
filter can be used to set a defined corner frequency and
attenuate some of the wideband noise. The actual compo-
nent values would need to be tuned for individual application
requirements. As a guideline, resistor values are typically in
the range of 10
to 50
, and capacitors in the range of 10pF
to 100pF. In any case, the R
IN
and C
IN
values should have
a low tolerance. This will ensure that the ADS5421 sees
closely matched source impedances.
FIGURE 5. Converting a Single-Ended Input Signal into a Differential Signal Using a RF Transformer.
R
IN
R
IN
C
IN
2.2
μ
F
0.1
μ
F
R
T
0.1
μ
F
1:n
R
S
R
G
OPA847
R
1
R
2
V
IN
+
ADS5421
IN
IN
CM
+5V
–5V
+5V
V
CM
≈
+2.5V
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| ADS5421R | 14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421T | 14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421Y | 14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421K5 | 14-Bit, 62MSPS Sampling ANALOG-TO-DIGITAL CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS5421EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS5421 Evaluation Module RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS5421K5 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:14-Bit, 62MSPS Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421R | 制造商:BB 制造商全稱:BB 功能描述:14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421T | 制造商:BB 制造商全稱:BB 功能描述:14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421Y | 制造商:BB 制造商全稱:BB 功能描述:14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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