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| 型号： | ADS1252U/2K5G4 |
| 厂商： | Texas Instruments |
| 文件页数： | 19/21页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24-BIT SER 41.7KHZ 8-SOIC |
| 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： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 41.7k |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 40mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | 296-19906-ND - EVAL MOD FOR ADS1252 |
ADS1252
7
SBAS127D
www.ti.com
THEORY OF OPERATION
The ADS1252 is a precision, high-dynamic range, 24-bit, delta-
sigma, A/D converter capable of achieving very high-resolution
digital results at high data rates. The analog-input signal
is sampled at a rate determined by the frequency of the system
clock (CLK). The sampled analog input is modulated by
the delta-sigma A/D modulator, which is followed by a digital
filter. A Sinc5 digital low-pass filter processes the output of
the delta-sigma modulator and writes the result into the data-
output register. The DOUT/DRDY pin is pulled LOW, indicating
that new data is available to be read by the external
microcontroller/microprocessor. As shown in the block dia-
gram, the main functional blocks of the ADS1252 are the
4th-order delta-sigma modulator, a digital filter, control logic,
and a serial interface. Each of these functional blocks is
described below.
ANALOG INPUT
The ADS1252 contains a fully differential analog input. In
order to provide low system noise, common-mode rejection
of 100dB, and excellent power-supply rejection, the design
topology is based on a fully differential switched-capacitor
architecture. The bipolar input voltage range is from –4.096
to +4.096V, when the reference input voltage equals +4.096V;
the bipolar range is with respect to –VIN, and not with respect
to GND.
With regard to the analog input signal, the overall analog
performance of the device is affected by three items. First,
the input impedance can affect accuracy; therefore, if the
source impedance of the input signal is significant, or if there
is passive filtering prior to the ADS1252, a significant portion
of the signal can be lost across this external impedance. The
magnitude of the effect is dependent on the desired system
performance. See application note
Understanding the
ADS1251, ADS1253, and ADS1254 Input Circuitry
(SBAA086), available for download from TI’s web site,
www.ti.com.
Second, the current into or out of the analog inputs must be
limited. Under no conditions should the current into or out of
the analog inputs exceed 10mA.
Third, to prevent aliasing of the input signal, the bandwidth of
the analog input signal must be band limited; the bandwidth
is a function of the system clock frequency. With a system
clock frequency of 16MHz, the data-output rate is 41.667kHz
with a –3dB frequency of 9kHz, where the –3dB frequency
scales with the system clock frequency.
To ensure the best linearity of the ADS1252, a fully differen-
tial signal is recommended.
BIPOLAR INPUT
The differential inputs of the ADS1252 are designed to
accept differential signals; however, each analog input volt-
age must stay between –0.3V and VDD. With a reference
voltage at less than half of VDD, one input can be tied to the
reference voltage, and the other input can range from 0V to
2 VREF. By using a single op amp circuit featuring a single
amplifier and four external resistors, the ADS1252 can be
configured to accept bipolar inputs referenced to ground. The
conventional
±2.5V, ±5V, and ±10V input ranges can be
interfaced to the ADS1252 using the resistor values shown in
Figure 1.
FIGURE 1. Level Shift Circuit for Bipolar Input Ranges.
10k
20k
R
1
OPA2350
+IN
–IN
V
REF
ADS1252
R2
Bipolar Input
REF
2.5V
BIPOLAR INPUT
R1
R2
±10V
2.5k
5k
±5V
5k
10k
±2.5V
10k
20k
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS1252UG4 | 功能描述:模数转换器 - ADC ResolutionPlus 24-Bit 40kHz 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 |
| ADS1253 | 制造商:TI 制造商全称:Texas Instruments 功能描述:24-Bit, 20kHz, Low Power ANALOG-TO-DIGITAL CONVERTER |
| ADS1253E | 功能描述:模数转换器 - ADC 24-Bit 20kHz Low Power 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 |
| ADS1253E/2K5 | 功能描述:模数转换器 - ADC 24-Bit 20kHz Low Power 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 |
| ADS1253E/2K5G4 | 功能描述:模数转换器 - ADC 24-Bit 20kHz Low Power 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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