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| 型号： | ADS1222IPWT |
| 厂商： | Texas Instruments |
| 文件页数： | 9/26页 |
| 文件大小： | 0K |
| 描述： | IC 24BIT ADC W/2CH MUX 14-TSSOP |
| 产品培训模块： | Data Converter Basics |
| 视频文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 标准包装： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 240 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 2.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 标准包装 |
| 输入数目和类型： | 4 个单端，单极；2 个差分，双极 |
| 其它名称： | 296-17321-6 |
ADS1222
SBAS314B APRIL 2004 REVISED JANUARY 2009
www.ti.com
17
APPLICATIONS INFORMATION
GENERAL RECOMMENDATIONS
The ADS1222 is a high-resolution A/D converter.
Achieving optimal device performance requires careful
attention to the support circuitry and printed circuit
board (PCB) design. Figure 30 shows the basic
connections for the ADS1222. As with any precision
circuit, be sure to use good supply bypassing capacitor
techniques. A smaller value ceramic capacitor in
parallel with a larger value tantalum capacitor works
well. Place the capacitors, in particular the ceramic
ones, close to the supply pins. Use a ground plane and
tie the ADS1222 GND pin and bypass capacitors
directly to it. Avoid ringing on the digital inputs. Small
resistors (
≈100) in series with the digital pins can help
by controlling the trace impedance. Place these
resistors at the source end.
Pay special attention to the reference and analog
inputs. These are the most critical circuits. Bypass the
voltage reference using similar techniques to the supply
voltages. The quality of the reference directly affects
the overall accuracy of the device. Make sure to use a
low noise and low drift reference such as the REF1004.
Often, only a simple RC filter is needed on the inputs.
This circuit limits the higher frequency noise. Avoid
low-grade dielectrics for the capacitors and place them
as close as possible to the input pins. Keep the traces
to the input pins short, and carefully watch how they are
routed on the PCB.
After the power supplies and reference voltage have
stabilized,
issue
a
self-calibration
command
to
minimize offset and gain errors.
ADS1222
VDD
SCLK
CLK
DRDY/DOUT
MUX
TEMPEN
BUFEN
VREFP
VREFN
GND
AINN1
AINP1
AINN2
AINP2
100
100
100
100
100
100
Same as shown
for AINP1 and AINN1.
0.1
F
10
F
+5V
0.1
F
10
F
+2.5V Reference
220pF
0.1
F
220pF
VIN
P
VIN
N
301
301
Figure 30. Basic Connections
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS1222IPWT | 制造商:Texas Instruments 功能描述:IC 24-BIT ADC 2 CH DIFF I/P MULTI |
| ADS1222IPWTG4 | 功能描述:模数转换器 - ADC 24-Bit Conv w/2-Ch Diff Input Mltplxer 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 |
| ADS1224 | 制造商:BB 制造商全称:BB 功能描述:24-Bit Analog-to-Digital Converter with 4-Channel Differential Input Multiplexer |
| ADS1224EVM | 功能描述:数据转换 IC 开发工具 ADS1224 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| ADS1224IPWR | 功能描述:模数转换器 - ADC 24-bit 240SPS 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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