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參數(shù)資料
| 型號(hào)： | ADS825E |
| 英文描述： | 10-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTERS |
| 中文描述： | 10位，40MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 199K |
| 代理商： | ADS825E |
9
ADS822, ADS825
FIGURE 2. AC-Coupled Input Configuration for a 2Vp-p Full-Scale Range and a Common-Mode Voltage, V
CM
, at +2.5V Derived
From the Internal Top (REFT) and Bottom Reference (REFB).
FIGURE 3. AC-Coupling the Dual Supply Amplifier OPA642 to the ADS822 for a 2Vp-p Full-Scale Input Range.
For applications requiring the driving amplifier to provide a
signal amplification, with a gain
≥
5, consider using decom-
pensated voltage-feedback op amps, like the OPA643, or
current-feedback op amps like the OPA681 and OPA658.
DC-coupled with Level Shift
Several applications may require that the bandwidth of the
signal path include DC, in which case, the signal has to be
DC-coupled to the A/D converter. In order to accomplish
this, the interface circuit has to provide a DC level shift to
the analog input signal. The circuit shown in Figure 4
employs a dual op amp, A1, to drive the input of the
ADS822 and ADS825, and level shifts the signal to be
compatible with the selected input range. With the RSEL pin
tied to the supply and the INT/EXT pin to ground, the
ADS822 and ADS825 are configured for a 2Vp-p input
range and use the internal references. The complementary
input (IN) may be appropriately biased using the +2.5V
common-mode voltage available at the CM pin. One half of
amplifier A1 buffers the REFB pin and drives the voltage
divider R
1
, R
2
. Due to the op amp’s noise gain of
+2V/V, assuming R
F
= R
IN
, the common-mode voltage
(V
CM
) has to be re-scaled to +1.25V. This results in the
correct DC level of +2.5V for the signal input (IN). Any DC
voltage differences between the IN and IN inputs of the
ADS822 and ADS825 effectively produces an offset, which
can be corrected for by adjusting the resistor values of the
divider, R
1
and R
2
. The selection criteria for a suitable op
amp should include the supply voltage, input bias current,
output voltage swing, distortion, and noise specification.
Note that in this example, the overall signal phase is in-
verted. To re-establish the original signal polarity, it is
always possible to interchange the IN and IN connections.
+V
IN
0V
–V
IN
OPA680
V
IN
R
F
402
1.62k
R
G
402
ADS822
ADS825
R
S
50
10pF
0.1
μ
F
IN
IN
CM
INT/EXT
GND
REFT
+3.5V
1.62k
50
V
CM
+2.5V
REFB
+1.5V
0.1
μ
F
0.1
μ
F
RSEL
+V
S
+5V
+5V
OPA642
V
IN
R
F
402
1.62k
R
G
402
ADS822
ADS825
R
S
24.9
1.62k
100pF
0.1
μ
F
0.1
μ
F
IN
IN
CM
REFB
+1.5V
INT/EXT
GND
REFT
+3.5V
RSEL
+V
S
+5V
+5V
–5V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS825E | 制造商:Texas Instruments 功能描述:Analog-Digital Converter IC Number of Bi |
| ADS825E/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10Bit 40MSPS SE/Diff Inp 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 |
| ADS825E/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10Bit 40MSPS SE/Diff Inp 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 |
| ADS825EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10Bit 40MSPS SE/Diff Inp 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 |
| ADS826 | 制造商:BB 制造商全稱:BB 功能描述:10-Bit. 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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