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參數(shù)資料
| 型號(hào)： | ADS824 |
| 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(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 185K |
| 代理商： | ADS824 |
9
ADS824
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 ADS823 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
ADS824 and level shift 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 ADS824 is configured
for a 2Vp-p input range and uses 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
. Because of 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 +1.25. 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
ADS824 effectively produces an offset, which can be cor-
rected 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 inverted. To re-establish
the original signal polarity, it is always possible to inter-
change the IN and IN connections.
+V
IN
0V
–V
IN
OPA680
V
IN
R
F
402
1.0k
R
G
402
ADS824
R
S
50
10pF
0.1
μ
F
IN
IN
CM
INT/EXT
GND
REFT
+3.5V
1.0k
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
1.0k
R
G
402
ADS824
R
S
24.9
1.0k
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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|---|---|
| ADS824E | 10-Bit, 70MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS824E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 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 |
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