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參數(shù)資料
| 型號： | ADS823E |
| 英文描述： | 10-Bit, 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 10位，60MHz時采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 204K |
| 代理商： | ADS823E |
10
ADS823, ADS826
FIGURE 4. DC-Coupled Interface Circuit with Level-Shifting, Dual Current-Feedback Amplifier OPA2681.
SINGLE-ENDED TO DIFFERENTIAL CONFIGURATION
(Transformer Coupled)
If the application requires a signal conversion from a single-
ended source to feed the ADS823 and ADS826 differen-
tially, a RF transformer 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 con-
verter inputs. AC grounding the center tap will generate the
differential signal swing across the secondary winding. Con-
sider a step-up transformer to take advantage of a signal
amplification without the introduction of another noise source.
Furthermore, 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 ADS823 and ADS826 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 component values of the R-C low-pass 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
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
V
IN
IN
IN
CM
22
22
47pF
R
T
47pF
+
10
μ
F
0.1
μ
F
INT/EXT
RSEL
+5V
ADS823
ADS826
1:n
0.1
μ
F
R
G
FIGURE 5. Transformer Coupled Input.
FIGURE 6. Equivalent Reference Circuit with Recommended
Reference Bypassing.
2Vp-p
NOTE: R
F
= R
IN
, G = –1
V
IN
R
2
200
R
1
1k
ADS823
ADS826
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
ADS823
ADS826
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS826 | 10-Bit. 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS826E | Analog-to-Digital Converter， 10-Bit |
| ADS8344N | 16-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS8344 | 16-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS8344E | 16-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS823E | 制造商:Texas Instruments 功能描述:IC 10-BIT ADC SAMPLING |
| ADS823E/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 60 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 |
| ADS823E/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 60 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 |
| ADS823EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 60 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 |
| ADS824 | 制造商:BB 制造商全稱:BB 功能描述:10-Bit, 70MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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