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參數(shù)資料
| 型號： | ADS824E |
| 英文描述： | 10-Bit, 70MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 10位，70MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 185K |
| 代理商： | ADS824E |
10
ADS824
2Vp-p
NOTE: R
F
= R
IN
, G = –1
V
IN
R
2
200
R
1
1k
ADS824
R
S
50
10pF
0.1μF
IN
IN
CM (+2.5V)
INT/EXT
R
F
499
R
IN
499
V
CM
= +1.25V
REFB
(+1.5V)
REFT
(+3.5V)
1/2
OPA2681
1/2
OPA2681
R
F
1k
50
0.1μF
0.1μF
RSEL
+V
S
+5V
+5V
FIGURE 4. DC-Coupled Interface Circuit with Level Shifting Using Dual Current-Feedback Amplifier OPA2681.
FIGURE 5. Transformer Coupled Input.
SINGLE-ENDED-TO-DIFFERENTIAL CONFIGURATION
(Transformer Coupled)
If the application requires a signal conversion from a single-
ended source to feed the ADS824 differentially, a RF trans-
former might be a good solution. The selected transformer
must have a center tap in order to apply the common-mode
DC voltage necessary to bias the converter inputs.
AC grounding the center tap will generate the differential
signal swing across the secondary winding. Consider a step-
up transformer to take advantage of a signal amplification
without the introduction of another noise source. Further-
more, the reduced signal swing from the source may lead to
an improved distortion performance.
The differential input configuration may provide a notice-
able advantage of achieving good SFDR performance over
a wide range of input frequencies. In this mode, both inputs
of the ADS824 see matched impedances, and the differential
signal swing can be reduced to half of the swing required for
single-ended drive. Figure 5 shows the schematic for the
suggested transformer-coupled interface circuit. The com-
ponent values of the R-C low-pass may be optimized de-
pending on the desired roll-off frequency. The resistor across
the secondary side (R
T
) should be calculated using the
equation R
T
= n
2
x R
G
to match the source impedance (R
G
)
for good power transfer and Voltage Standing Wave Ratio
(VSWR).
REFERENCE OPERATION
Figure 6 depicts the simplified model of the internal refer-
ence circuit. The internal blocks are the bandgap voltage
reference, the drivers for the top and bottom reference, and
V
IN
IN
IN
CM
22
22
47pF
R
T
47pF
+
10μF
0.1μF
INT/EXT
RSEL
+5V
ADS824
1:n
0.1μF
R
G
FIGURE 6. Equivalent Reference Circuit with Recommended
Reference Bypassing.
ADS824
REFT
ByT
CM
ByB
REFB
Bypass Capacitors: 0.1μF || 2.2μF each
Bandgap Reference and Logic
V
REF
400
400
400
400
+1
+1
+V
S
50k
50k
INT/EXT
RSEL
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS824E/1K | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 10-Bit |
| ADS825 | 制造商:BB 制造商全稱:BB 功能描述:10-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTERS |
| ADS8254 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER |
| ADS8254IBRGCR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16B,4Ch Diff Comp Acquisition Solution 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 |
| ADS8254IBRGCT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16B,4Ch Diff Comp Acquisition Solution 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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