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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： | 21/24页 |
| 文件大小： | 276K |
| 代理商： | ADS1203 |
SBAS318 JUNE 2004
www.ti.com
21
LAYOUT CONSIDERATIONS
Power Supplies
The ADS1203 requires only one power supply (V
DD
). If
there are separate analog and digital power supplies on
the board, a good design approach is to have the
ADS1203 connected to the analog power supply.
Another possible approach to control noise is the use of
a resistor on the power supply. The connection can be
made between the ADS1203 power-supply pins via a
10
resistor. The combination of this resistor and the
decoupling capacitors between the power-supply pins
on the ADS1203 provide some filtering. The analog
supply that is used must be well regulated and generate
low noise. For designs requiring higher resolution from
the ADS1203, power-supply rejection will be a concern.
The digital power supply has high-frequency noise that
can be capacitively coupled into the analog portion of
the ADS1203. This noise can originate from switching
power
supplies,
microprocessors,
High-frequency noise will generally be rejected by the
external digital filter at integer multiples of MCLK. Just
below and above these frequencies, noise will alias
back into the passband of the digital filter, affecting the
conversion result. Inputs to the ADS1203, such as
V
IN
+, V
IN
, and MCLK should not be present before the
power supply is on. Violating this condition could cause
latch-up. If these signals are present before the supply
or
DSPs.
is on, series resistors should be used to limit the input
current. Experimentation may be the best way to
determine the appropriate connection between the
ADS1203 and different power supplies.
Grounding
Analog and digital sections of the design must be
carefully and cleanly partitioned. Each section should
have its own ground plane with no overlap between
them. Do not join the ground planes; instead, connect
the two with a moderate signal trace underneath the
converter. For multiple converters, connect the two
ground planes as close as possible to one central
location for all of the converters. In some cases,
experimentation may be required to find the best point
to connect the two planes together.
Decoupling
Good decoupling practices must be used for the
ADS1203 and for all components in the design. All
decoupling capacitors, specifically the 0.1
μ
F ceramic
capacitors, must be placed as close as possible to the
pin being decoupled. A 1
μ
F and 10
μ
F capacitor, in
parallel with the 0.1
μ
F ceramic capacitor, can be used
to decouple V
DD
to GND. At least one 0.1
μ
F ceramic
capacitor must be used to decouple V
DD
to GND, as
well as for the digital supply on each digital component.
相关PDF资料 |
PDF描述 |
|---|---|
| ADS1203IPWR | MOTOR CONTROL CURRENT MEASUREMENT |
| ADS1203IPWT | S/P 20 RED REV M |
| ADS1217 | 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS1217IPFBR | 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS1217IPFBT | 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER |
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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