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參數(shù)資料
| 型號： | ADS2806 |
| 英文描述： | Dual, 12-Bit, 32MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 雙通道，12位，32MHz的采樣模擬數(shù)字轉換器 |
| 文件頁數(shù)： | 12/19頁 |
| 文件大小： | 378K |
| 代理商： | ADS2806 |
ADS2806
SBAS178B
12
www.ti.com
FIGURE 4. AC-Coupling the Dual-Supply Amplifier OPA642 to the ADS2806 for a 2Vp-p Full-Scale Input Range.
OPA642
V
IN
R
F
402
R
G
402
1/2
ADS2806Y
R
S
16.5
68pF
0.1
μ
F
0.1
μ
F
IN
IN
CM
+5V
–
5V
1.82k
One Channel of Two
top and bottom references (REFT, REFB) provide an output
voltage of +3.0V and +2.0V, respectively. The CM output of
the ADS2806 is used to bias the inputs of the driving
amplifiers. Using the OPA2681 on a single +5V supply, its
ideal common-mode point is +2.5V, which coincides with
the recommended common-mode input level for the
ADS2806, thus eliminating the need for coupling capacitors
between the amplifiers and the converter.
The addition of a small series resistor (R
S
) between the
output of the op amps and the input of the ADS2806 will be
beneficial in almost all interface configurations. It will de-
couple the op amp
’
s output from the capacitive load and
avoid gain peaking that can result in increased noise. For
best spurious and distortion performance, the resistor value
should be kept below 100
. Furthermore, the series resis-
tor, in combination with the shunt capacitor, establishes a
passive low-pass filter limiting the bandwidth for the wideband
noise, thus improving the SNR. The spurious-free dynamic
range of this single-supply front end is limited by the 2nd-
harmonic distortion. An improvement of several dB may be
realized by adding a pull-down resistor (R
P
) at the output of
each amplifier. This pulls a DC bias current out of the output
stage of the amplifier. It is set to approximately 5mA, see
Figure 3, but will vary depending on the amplifier used.
Single-Ended, AC-Coupled, Dual-Supply Interface
The circuit provided in Figure 4 shows typical connections
for using the ADS2806 in a single-ended input configura-
tion. The bias requirements for AC-coupling are provided by
a single resistor to the CM output lead. The single-ended
mode of operation should be considered for ease of inter-
face complexity and applications where the dynamic perfor-
mance can be compromised. The series resistor R
S
, along
with the shunt capacitance, provide the means to adjust the
bandwidth and optimize the performance towards good
signal-to-noise ratio. In addition, the amplifier configuration
can be easily modified for an anti-aliasing filter based on a
2nd-order Sallen-Key or Multiple-Feedback topology.
The interface example, shown in Figure 4, operates with the
full-scale range of the ADS2806 set to 2Vp-p, leaving
sufficient headroom for the output of the OPA642 to drive
the converter and maintain low signal distortion.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS2806-EVM | 功能描述:數(shù)據(jù)轉換 IC 開發(fā)工具 ADS2806-EVM Eval Mod 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 |
| ADS2806Y | 制造商:Texas Instruments 功能描述: |
| ADS2806Y/1K5 | 功能描述:模數(shù)轉換器 - ADC 12-Bit 32 MSPS Dual Int/Ext Ref RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| ADS2806Y/1K5G4 | 功能描述:模數(shù)轉換器 - ADC 12-Bit 32 MSPS Dual Int/Ext Ref RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| ADS2806Y/250 | 功能描述:模數(shù)轉換器 - ADC 12-Bit 32 MSPS Dual Int/Ext Ref RoHS:否 制造商:Texas Instruments 通道數(shù)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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