参数资料
| 型号： | ISL267817IUZ |
| 厂商： | Intersil |
| 文件页数： | 4/18页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE |
| 标准包装： | 980 |
| 系列： | * |
ISL267817
12
FN7877.2
April 19, 2012
Differential signaling offers several benefits over a single-ended
input, such as:
Doubling of the full-scale input range (and therefore the
dynamic range)
Improved even order harmonic distortion
Better noise immunity due to common mode rejection
Figure 28 shows the relationship between the reference voltage
and the full-scale input range for two different values of VREF.
Note that there is a trade-off between VREF and the allowable
common mode input voltage (VCM). The full-scale input range is
proportional to VREF; therefore the VCM range must be limited
for larger values of VREF in order to keep the absolute maximum
and minimum voltages on the +IN and –IN pins within
single-ended and differential inputs, respectively.
Voltage Reference Input
An external low-noise reference voltage must be applied to the VREF
pin to set the full-scale input range of the converter. The reference
input accepts voltages ranging from 0.1V to 2.5V; however the
device is specified with a reference voltage of 2.5V.
for the ISL267817. Figure 31 uses the precision ISL21090
voltage reference which exhibits exceptionally low drift and low
noise. The VREF input pin of the ISL267817 devices uses very low
current, so the decoupling capacitor can be small (0.1F).
Figure 32 illustrates the ISL21010 voltage reference being used
with these ADCs. The ISL21010 series voltage references have
higher noise and drift than the ISL26090 devices, but they
consume very low operating current and are excellent for
battery-powered applications.
FIGURE 28. RELATIONSHIP BETWEEN VREF AND FULL-SCALE RANGE
3.0
5.0
2.0
1.0
4.0
+IN
–IN
VCM
2.0Vpp
VREF = 2V
3.0
5.0
2.0
1.0
4.0
+IN
–IN
VCM
2.5Vpp
VREF = 2.5V
t
V
t
V
FIGURE 29. RELATIONSHIP BETWEEN VREF AND VCM FOR
SINGLE-ENDED INPUTS (+VCC = 5V)
FIGURE 30. RELATIONSHIP BETWEEN VREF AND VCM FOR
DIFFERENTIAL INPUTS (+VCC = 5V)
3.0
5.0
2.0
1.0
4.0
VCM
SIN G LE-EN D ED
0.5
1 .0
1.5
2 .0
2.5
0.0
-1.0
2.8
2.2
-0.3
4.0
3.0
5.0
2.0
1.0
4.0
VCM
DIFFERENTIA L
0.5
1 .0
1.5
2 .0
2.5
0.0
-1.0
2.75
0.95
-0.3
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| ISL267817IUZ-T | 功能描述:模数转换器 - ADC 12 BIT 200KSPS SAR 8LD 3 X 3 PROPRIETRY RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ISL267817IUZ-T7A | 功能描述:模数转换器 - ADC 12 Bit 200kSPS SAR ADC 8LD RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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| ISL28005_10 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Micropower, Rail-to-Rail Input Current Sense Amplifier with Voltage Output |
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