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參數(shù)資料
| 型號： | ADS1252U/2K5G4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 20/21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(biāo)準(zhǔn)包裝： | 2,500 |
| 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： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
| 配用： | 296-19906-ND - EVAL MOD FOR ADS1252 |
ADS1252
8
SBAS127D
www.ti.com
FIGURE 2. Recommended External Voltage Reference Circuit for Best Low-Noise Operation with the ADS1252.
DELTA-SIGMA MODULATOR
The ADS1252 operates from a nominal system clock fre-
quency of 16MHz which is fixed in relation to the system
clock frequency that is divided by 6 to derive the modulator
frequency; therefore, with a system clock frequency of 16MHz,
the modulator frequency is 2.667MHz. Furthermore, the
oversampling ratio of the modulator is fixed in relation to the
modulator frequency. The oversampling ratio of the modula-
tor is 64, and with the modulator frequency running at
2.667MHz, the data rate is 41.667kHz; thus, using a slower
system clock frequency will result in a lower data output rate,
as shown in Table I.
TABLE I. CLK Rate versus Data Output Rate.
CLK (MHz)
DATA OUTPUT RATE (Hz)
16.000(1)
41 667
15.360(1)
40 000
15.000(1)
30 063
14.745600(1)
38 400
14.318180(1)
37 287
12.288000(1)
32 000
12.000000(1)
31 250
11.059220(1)
28 800
10.000000(1)
26 042
9.600000
25 000
7.372800(1)
19 200
6.144000(1)
16 000
6.000000(1)
15 625
4.915200(1)
12 800
3.686400(1)
9 600
3.072000(1)
8 000
2.457600(1)
6 400
1.843200(1)
4 800
0.921600
2 400
0.460800
1 200
0.384000
1 000
0.192000
500
0.038400
100
0.023040
60
0.019200
50
0.011520
30
0.009600
25
0.007680
20
0.006400
16.67
0.005760
15
0.004800
12.50
0.003840
10
NOTE: (1) Standard Clock Oscillator.
REFERENCE INPUT
Reference input takes an average current of 220
A with a
16MHz system clock; this current will be proportional to the
system clock. A buffered reference is recommended for
ADS1252. The recommended reference circuit is shown in
Figure 2.
Reference voltages higher than 4.096V will increase the full-
scale range, whereas the absolute internal circuit noise of the
converter remains the same. This will decrease the noise in
terms of ppm of full scale, which increases the effective
resolution (see the typical characteristic curve,
RMS Noise vs
VREF).
DIGITAL FILTER
The digital filter of the ADS1252, referred to as a sinc5 filter,
computes the digital result based on the most recent outputs
from the delta-sigma modulator. At the most basic level, the
digital filter can be thought of as simply averaging the
modulator results in a weighted form and presenting this
average as the digital output. The digital output rate, or data
rate, scales directly with the system CLK frequency, this
allows the data output rate to be changed over a very wide
range (five orders of magnitude) by changing the system
CLK frequency. However, it is important to note that the
–3dB point of the filter is 0.216 times the data output rate, so
the data output rate must allow for sufficient margin to
prevent attenuation of the signal of interest.
As the conversion result is essentially an average, the
data-output rate determines the location of the resulting
notches in the digital filter (see Figure 3). Note that the first
notch is located at the data-output rate frequency, and
subsequent notches are located at integer multiples of the
data-output rate to allow for rejection of not only the funda-
mental frequency, but also harmonic frequencies. In this
manner, the data-output rate can be used to set specific
notch frequencies in the digital filter response.
0.10
F
+5V
10k
10
F
4
3
2
7
6
+
0.10
F
0.1
F
10
F
+
0.1
F
OPA350
0.1
F
+5V
3
1
2
To V
REF
Pin 8 of
the ADS1252
REF3140
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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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