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参数资料
| 型号： | ADS1203IPWT |
| 英文描述： | S/P 20 RED REV M |
| 中文描述： | 电机控制电流测量 |
| 文件页数： | 18/24页 |
| 文件大小： | 276K |
| 代理商： | ADS1203IPWT |
SBAS318 JUNE 2004
www.ti.com
18
APPLICATIONS
Operating the ADS1203 in a typical application using
mode 0 is shown in Figure 13. Measurement of the
motor phase current is done via the shunt resistor. For
better performance, both signals are filtered. R
2
and C
2
filter noise on the noninverting input signal, R
3
and C
3
filter noise on the inverting input signal, and C
4
in
combination with R
2
and R
3
filter the differential input
signal. In this configuration, the shunt resistor is
connected via three wires with the ADS1203.
The power supply is taken from the upper gate driver
power supply. A decoupling capacitor of 0.1
μ
F is
recommended for filtering the power supply. If better
filtering is required, an additional 1
μ
F to 10
μ
F capacitor
can be added.
The control lines M0 and M1 are both low while the part
is operating in mode 0. Two output signals, MCLK and
MDAT, are connected directly to the optocoupler. The
optocoupler can be connected to transfer a direct or
inverse signal because the output stage has the
capacity to source and sink the same current. The
discharge resistor is not needed in parallel with
optocoupler diodes because the output driver has
push-pull capability to keep the LED diode out of the
charge.
The DSP (such as a C28x or C24x) can be directly
connected at the output of two channels of the
optocoupler. In this configuration, the signals arriving at
C28x or C24x are standard delta-sigma modulator
signals and are connected directly to the SPICLK and
SPISIMO pins. Being a delta-sigma converter, there is
no need to have word sync on the serial data, so an SPI
is ideal for connection. McBSP would work as well in
SPI mode.
When component reduction is necessary, the ADS1203
can operate in mode 2, as shown in Figure 14. M1 is
high and M0 is low. Only the noninverting input signal
is filtered. R
2
and C
2
filter noise on the input signal. The
inverting input is directly connected to the GND pin,
which is simultaneously connected to the shunt resistor.
The output signal from the ADS1203 is Manchester
coded. In this case, only one signal is transmitted. For
that reason, one optocoupler channel is used instead of
two channels, as in the previous example of Figure 13.
Another advantage of this configuration is that the DSP
will use only one line per channel instead of two. That
permits the use of smaller DSP packages in the
application.
R
3
27
R
SENSE
R
2
27
D
5.1V
R
1
C
1
0.1
μ
F
ADS1203
C
1nF
C
3
1nF
C
10nF
R
4
R
5
M0
V
IN
+
V
IN
M1
V
DD
MCLK
MDAT
GND
HV+
HV
Floating
Power Supply
SPICLK
C28x
or
C24x
Optocoupler
SPISIMO
Gated
Drive
Circuit
Power Supply
Gated
Drive
Circuit
Figure 13. Application Diagram in Mode 0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ADS1203IRGTRG4 | 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 |
| ADS1203IRGTT | 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 |
| ADS1203IRGTTG4 | 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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