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參數(shù)資料
| 型號： | ADS1252U/2K5 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 19/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24-BIT SER 41.7KHZ 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Basics |
| 視頻文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 標準包裝： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 41.7k |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 40mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 標準包裝 |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
| 其它名稱： | 296-25896-6 |
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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| ADS1252UG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC ResolutionPlus 24-Bit 40kHz RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1253 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:24-Bit, 20kHz, Low Power ANALOG-TO-DIGITAL CONVERTER |
| ADS1253E | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit 20kHz Low Power RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1253E/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit 20kHz Low Power RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1253E/2K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit 20kHz Low Power RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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