參數(shù)資料
型號(hào)： ADS1254E
英文描述： 24-Bit, 20kHz, Low Power ANALOG-TO-DIGITAL CONVERTER
中文描述： 24位20kHz的，低功耗模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 15/17頁(yè)
文件大?。?/td> 281K
代理商： ADS1254E
ADS1254
SBAS213
15
N
NOISE
REDUCTION
FACTOR
ER
IN
Vrms
ER
IN
(Number
of Averages)
BITS rms
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
1
14.6
μ
V
10.3
μ
V
7.3
μ
V
5.16
μ
V
3.65
μ
V
2.58
μ
V
1.83
μ
V
1.29
μ
V
0.91
μ
V
0.65
μ
V
0.46
μ
V
0.32
μ
V
0.23
μ
V
19.1
19.6
20.1
20.6
21.1
21.6
22.1
22.6
23.1
23.6
24.1
24.6
25.1
1.414
2
2.82
4
5.66
8
11.3
16
22.6
32
45.25
64
TABLE V. Averaging.
Conversion Cycle—
as used here, a conversion cycle refers
to the time period between DOUT/DRDY pulses.
Effective Resolution (ER)—
of the ADS1254 in a particular
configuration can be expressed in two different units:
bits rms (referenced to output) and
μ
Vrms (referenced to
input). Computed directly from the converter's output data,
each is a statistical calculation based on a given number of
results. Noise occurs randomly; the rms value represents a
statistical measure that is one standard deviation. The ER in
bits can be computed as follows:
ER in bits rms=
20log
2V
Vrms noise
6.02
REF
The 2 V
REF
figure in each calculation represents the
full-scale range of the ADS1254. This means that both units
are absolute expressions of resolution—the performance in
different configurations can be directly compared, regard-
less of the units.
f
MOD
—
frequency of the modulator and the frequency the
input is sampled.
f
CLK
MOD
=
Frequency
6
f
DATA
—
Data output rate.
f
f
CLK
DATA
MOD
64
=
=
384
Frequency
Noise Reduction—
for random noise, the ER can be im-
proved with averaging. The result is the reduction in noise by
the factor
√
N, where N is the number of averages, as shown
in Table V. This can be used to achieve true 24-bit perfor-
mance at a lower data rate. To achieve 24 bits of resolution,
more than 24 bits must be accumulated. A 36-bit accumulator
is required to achieve an ER of 24 bits. Table V uses V
REF
=
4.096V, with the ADS1254 outputting data at 20kHz, a 4096
point average will take 204.8ms. The benefits of averaging
will be degraded if the input signal drifts during that 200ms.
相關(guān)PDF資料
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ADS1255IDB Very Low Noise, 24-Bit Analog-to-Digital Converter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS1254E 制造商:Texas Instruments 功能描述:IC 24BIT ADC SMD 1254 SSOP20 制造商:Texas Instruments 功能描述:IC, 24BIT ADC, SMD, 1254, SSOP20 制造商:Texas Instruments 功能描述:IC, 24BIT ADC, SMD, 1254, SSOP20; Resolution (Bits):24bit; Sampling Rate:20.8kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:800A; Digital IC Case Style:SSOP; No. of Pins:20; ;RoHS Compliant: Yes
ADS1254E/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
ADS1254E/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
ADS1254EG4 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
ADS1254-EP 制造商:TI 制造商全稱:Texas Instruments 功能描述:24-Bit, 20-kHz, LOW POWER ANALOG-TO-DIGITAL CONVERTER
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