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参数资料
| 型号： | ADS7945SRTET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 2-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 19/49页 |
| 文件大小： | 1322K |
| 代理商： | ADS7945SRTET |
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AVDD
GND
REF
REFGND
ADS7945
ADS7946
REF50xx
(1)
AVDD
AGND
1 F
m
Ceramic
SBAS539B
– JUNE 2011 – REVISED SEPTEMBER 2011
REFERENCE
The ADS7945/6 use an external reference voltage during the conversion of a sampled signal. The devices switch
the capacitors used in the conversion process to the reference terminal during conversion. The switching
frequency is the same as the SCLK frequency. It is necessary to decouple the REF terminal to REFGND with a 1
F ceramic capacitor in order to get the best noise performance from the device. The capacitor must be placed
closest to these pins. The reference input can be driven with the REF50xx series precision references from TI.
Figure 78 shows a typical reference driving circuit.
Sometimes it is convenient to use AVDD as a reference. The ADS7945/6 allow reference ranges up to AVDD.
However, make sure that AVDD is well-bypassed and that there is a separate bypass capacitor between REF
and REFGND.
(1) Select the appropriate device as described by the required reference value. For example, select the REF5040 for a 4 V reference, the
– REF) > 0.2 V so that the REF50xx functions
properly.
Figure 78. Typical Reference Driving Circuit
CLOCK
The ADS7945/6 use SCLK for conversions (typically 40 MHz). A lower frequency SCLK can be used for
applications that require sample rates less than 2 MSPS. However, it is better to use a 40 MHz SCLK and slow
down the device speed by choosing a lower frequency for CS, which allows more acquisition time. This
configuration relaxes constraints on the output impedance of the driving circuit. Refer to the Application
Information section for calculation of the driving circuit output impedance.
26
Copyright
2011, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS7946 | 制造商:TI 制造商全称:Texas Instruments 功能描述:14-Bit, 2 MSPS, Dual-Channel, Differential/Single-Ended, Ultralow-Power Analog-to-Digital Converters |
| ADS7946EVM-PDK | 功能描述:数据转换 IC 开发工具 ADS7946 PERF DEM KIT 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 |
| ADS7946SRTER | 功能描述:模数转换器 - ADC 14B,2MSPS,DUAL-CH, UNIP,PSE-DIF,SAR ADC 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 |
| ADS7946SRTET | 功能描述:模数转换器 - ADC 14B,2MSPS,DUAL-CH, UNIP,PSE-DIF,SAR ADC 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 |
| ADS7947 | 制造商:TI 制造商全称:Texas Instruments 功能描述:12/10/8-Bit 2MSPS, Dual-Channel Unipolar Pseudo-Differential Ultralow-Power SAR Analog-to-Digital Converters |
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