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參數資料
| 型號： | ADS5421K5 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 14-Bit, 62MSPS Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 14位，62MSPS采樣模擬數字轉換器 |
| 文件頁數： | 11/21頁 |
| 文件大小： | 395K |
| 代理商： | ADS5421K5 |
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| ADS5421Y/R | 功能描述:模數轉換器 - ADC 14 Bit 40MSPS Sampling ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS5421Y/RG4 | 功能描述:模數轉換器 - ADC 14 Bit 40MSPS Sampling ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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