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參數(shù)資料
| 型號： | ADS830E |
| 英文描述： | 8-Bit, 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 8位，60MHz時采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 177K |
| 代理商： | ADS830E |
9
ADS830
FIGURE 5. Transformer Coupled Input.
FIGURE 6. Equivalent Reference Circuit with Recommended
Reference Bypassing.
V
IN
IN
IN
CM
22
22
47pF
R
T
47pF
+
10μF
0.1μF
INT/EXT
RSEL
+5V
ADS830
1:n
0.1μF
R
G
ADS830
REFT
CM
REFB
Bypass Capacitors: 0.1μF || 2.2μF each
Bandgap Reference and Logic
V
REF
400
400
+1
+1
+V
S
50k
50k
INT/EXT
RSEL
SINGLE-ENDED-TO-DIFFERENTIAL CONFIGURATION
(Transformer Coupled)
If the application requires a signal conversion from a single-
ended source to feed the ADS830 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 ADS830 see closely matched impedances, and the
differential signal swing is reduced to half of the swing
required for single-ended drive. Figure 5 shows the sche-
matic for the suggested transformer coupled interface cir-
cuit. The component values of the R-C lowpass may be
optimized depending 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 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
2Vp-p
NOTE: R
F
= R
IN
, G = –1
V
IN
R
2
301
R
1
499
ADS830
R
S
39
47pF
0.1μF
IN
IN
CM (+2.5V)
INT/EXT
R
F
499
R
IN
499
V
CM
= +1.25V
REFB
(+2.0V)
REFT
(+3.0V)
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 Dual Current-Feedback Amplifier OPA2681. The OPA2680 can be used in place
of the OPA2681 if a voltage feedback amplifier is preferred.
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| ADS831E | MOSFET; Transistor Polarity:N Channel; Drain Source Voltage, Vds:25V; Continuous Drain Current, Id:0.75A; On-Resistance, Rds(on):0.35ohm; Rds(on) Test Voltage, Vgs:4.5V; Package/Case:3-SC-70; Leaded Process Compatible:No |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS830E/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 60 MSPS SE/Diff Inputs 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 |
| ADS830E/2K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 60 MSPS SE/Diff Inputs 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 |
| ADS830EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 60 MSPS SE/Diff Inputs 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 |
| ADS831 | 制造商:BB 制造商全稱:BB 功能描述:8-Bit, 80MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS8317 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER |
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