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| 型号： | ADS1203 |
| 英文描述： | MOTOR CONTROL CURRENT MEASUREMENT |
| 中文描述： | 电机控制电流测量 |
| 文件页数： | 17/24页 |
| 文件大小： | 276K |
| 代理商： | ADS1203 |
SBAS318 JUNE 2004
www.ti.com
17
The effective number of bits (ENOB) can be used to
compare the performance of ADCs and delta-sigma
modulators. Figure 11 shows the ENOB of the
ADS1203 with different filter types. In this data sheet,
the ENOB is calculated from the SNR:
SNR = 1.76dB + 6.02dB
×
ENOB
16
14
12
10
8
6
4
2
0
E
OSR
1
10
100
1000
sinc
3
sinc
sinc
2
sincfast
Figure 11. Measured ENOB vs OSR
In motor control applications, a very fast response time
for overcurrent detection is required. There is a
constraint between 1
μ
s and 5
μ
s with 3 bits to 7 bits
resolution. The time for full settling is dependent on the
filter order. Therefore, the full settling of the sinc
3
filter
needs three data clocks and the sinc
2
filter needs two
data clocks. The data clock is equal to the modulator
clock divided by the OSR. For overcurrent protection,
filter types other than sinc
3
might be a better choice. A
simple example is a sinc
2
filter. Figure 12 compares the
settling time of different filter types. The sincfast is a
modified sinc
2
filter:
H(z)
1
z
OSR
z
1
1
2
1
z
2
OSR
10
9
8
7
6
5
4
3
2
1
0
E
Settling Time (
μ
s)
1
2
3
4
5
6
7
8
9
0
10
sinc
2
sinc
sinc
3
sincfast
Figure 12. Measured ENOB vs Settling Time
For more information, see application note SBAA094,
Combining the ADS1202 with an FPGA Digital Filter for
Current Measurement in Motor Control Applications
,
available for download at www.ti.com.
(3)
(4)
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PDF描述 |
|---|---|
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS1203IPWR | 功能描述:模数转换器 - ADC Current Shunt D-S Modulator 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 |
| ADS1203IPWRG4 | 功能描述:模数转换器 - ADC Current Shunt D-S Modulator 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 |
| ADS1203IPWT | 功能描述:模数转换器 - ADC Current Shunt D-S Modulator 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 |
| ADS1203IPWTG4 | 功能描述:模数转换器 - ADC Current Shunt D-S Modulator 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 |
| ADS1203IRGTR | 功能描述:模数转换器 - ADC Current Shunt D-S Modulator 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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