參數(shù)資料
型號(hào)： ADS826
英文描述： 10-Bit. 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER
中文描述： 10位。 60MHz時(shí)采樣模擬到數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 9/13頁(yè)
文件大小： 204K
代理商： ADS826
9
ADS823, ADS826
OPA642
V
IN
R
F
402
1.62k
R
G
402
ADS823
ADS826
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
+V
IN
0V
–V
IN
OPA680
V
IN
R
F
402
1.62k
R
G
402
ADS823
ADS826
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
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).
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 includes 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 ADS823 and
ADS826, 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 ADS823 and ADS826
are configured for a 2Vp-p input range and uses the internal
references. The complementary input (IN) may be appropri-
ately biased using the +2.5V common-mode voltage avail-
able 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 ADS823 and ADS826 effectively produce
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 specifi-
cation. Note that in this example the overall signal phase is
inverted. To re-establish the original signal polarity, it is
always possible to interchange the IN and IN connections.
FIGURE 3. AC-Coupling the Dual Supply Amplifier OPA642 to the ADS823 and ADS826 for a 2Vp-p Full Scale Input Range.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS826E 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
ADS826E(1) 制造商:BB 制造商全稱:BB 功能描述:10-Bit, 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER
ADS826E/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
ADS826E/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
ADS826EG4 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
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