參數(shù)資料
型號(hào)： ADS828E
英文描述： 10-Bit, 75MHz Sampling ANALOG-TO-DIGITAL CONVERTER
中文描述： 10位，75MHz的采樣模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 10/12頁(yè)
文件大?。?/td> 172K
代理商： ADS828E
10
ADS828
FIGURE 4. DC-Coupled Interface Circuit with Level Shifting Using Dual Current-Feedback Amplifier OPA2681.
FIGURE 5. Transformer Coupled Input.
FIGURE 6. Equivalent Reference Circuit with Recommended
Reference Bypassing.
SINGLE-ENDED-TO-DIFFERENTIAL CONFIGURATION
(Transformer Coupled)
If the application requires a signal conversion from a single-
ended source to feed the ADS828 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 ADS828 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 compo-
nent values of the R-C low-pass may be optimized depend-
ing 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
the resistive reference ladder. The bandgap reference circuit
2Vp-p
NOTE: R
F
= R
IN
, G = –1
V
IN
R
2
200
R
1
1k
ADS828
R
S
50
10pF
0.1
μ
F
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
0.1
μ
F
0.1
μ
F
RSEL
+V
S
+5V
+5V
V
IN
IN
IN
CM
22
22
47pF
R
T
47pF
+
10
μ
F
0.1
μ
F
INT/EXT
RSEL
+5V
ADS828
1:n
0.1
μ
F
R
G
ADS828
REFT
ByT
CM
ByB
REFB
Bypass Capacitors: 0.1
μ
F || 2.2
μ
F 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
ADS828E 制造商:Texas Instruments 功能描述:IC 10BIT ADC 75MHZ SSOP28 828 制造商:Texas Instruments 功能描述:IC, 10BIT ADC, 75MHZ, SSOP28, 828
ADS828E 制造商:Texas Instruments 功能描述:IC 10-BIT ADC SAMPLING
ADS828E/1K 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 75 MSPS SE/Diff Int/Ext Ref 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
ADS828E/1KG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 75 MSPS SE/Diff Int/Ext Ref 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
ADS828EG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 75 MSPS SE/Diff Int/Ext Ref 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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