công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

ADS8321 bảng dữ liệu(PDF) 8 Page - Texas Instruments

Click here to check the latest version.
tên linh kiện ADS8321
Giải thích chi tiết về linh kiện  16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
Download  19 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI1 - Texas Instruments

ADS8321 bảng dữ liệu(HTML) 8 Page - Texas Instruments

Back Button ADS8321 Datasheet HTML 4Page - Texas Instruments ADS8321 Datasheet HTML 5Page - Texas Instruments ADS8321 Datasheet HTML 6Page - Texas Instruments ADS8321 Datasheet HTML 7Page - Texas Instruments ADS8321 Datasheet HTML 8Page - Texas Instruments ADS8321 Datasheet HTML 9Page - Texas Instruments ADS8321 Datasheet HTML 10Page - Texas Instruments ADS8321 Datasheet HTML 11Page - Texas Instruments ADS8321 Datasheet HTML 12Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 19 page
background image
ADS8321
8
SBAS123B
www.ti.com
different settling times. This may result in offset error, gain
error, and linearity error which change with both tempera-
ture and input voltage. If the impedance cannot be matched,
the errors can be lessened by giving the ADS8321 additional
acquisition time.
The input current on the analog inputs depends on a number
of factors: sample rate, input voltage, and source impedance.
Essentially, the current into the ADS8321 charges the inter-
nal capacitor array during the sample period. After this
capacitance has been fully charged, there is no further input
current. The source of the analog input voltage must be able
to charge the input capacitance (25pF) to 16-bit settling level
within 4.5 clock cycles. When the converter goes into the
hold mode or while it is in the power-down mode, the input
impedance is greater than 1G
Ω.
Care must be taken regarding the absolute analog input
voltage. The +In input should always remain within the
range of GND – 300mV to VCC + 300mW. The –In input
should always remain within the range of GND – 300mV to
4V. Outside of these ranges, the converter’s linearity may
not meet specifications.
REFERENCE INPUT
The external reference sets the analog input range. The
ADS8321 will operate with a reference in the range of
500mV to 2.5V. There are several important implications of
this. As the reference voltage is reduced, the analog voltage
weight of each digital output code is reduced. This is often
referred to as the Least Significant Bit (LSB) size and is
equal to 2 • VREF divided by 65,535. This means that any
offset or gain error inherent in the ADC will appear to
increase, in terms of LSB size, as the reference voltage is
reduced.
The noise inherent in the converter will also appear to
increase with lower LSB size. With a +2.5V reference, the
internal noise of the converter typically contributes only 5
LSB peak-to-peak of potential error to the output code. When
the external reference is 500mV, the potential error contribu-
tion from the internal noise will be 10 times larger—15 LSBs.
The errors due to the internal noise are gaussian in nature and
can be reduced by averaging consecutive conversion results.
For more information regarding noise, consult the typical
performance curve “Noise vs Reference Voltage.” Note that
the Effective Number of Bits (ENOB) figure is calculated
based on the converter’s signal-to-(noise + distortion) ratio
with a 1kHz, 0dB input signal. SINAD is related to ENOB
as follows:
SINAD = 6.02 • ENOB + 1.76
With lower reference voltages, extra care should be taken to
provide a clean layout including adequate bypassing, a clean
power supply, a low-noise reference, and a low-noise input
signal. Because the LSB size is lower, the converter will also
be more sensitive to external sources of error such as nearby
digital signals and electromagnetic interference.
FIGURE 4. Histogram of 5,000 Conversions of a DC Input
at the Code Transition.
NOISE
The noise floor of the ADS8321 itself is extremely low, as
can be seen from Figures 4 and 5, and is much lower than
competing A/D converters. It was tested by applying a low
noise DC input and a 2.5V reference to the ADS8321 and
initiating 5,000 conversions. The digital output of the ADC
will vary in output code due to the internal noise of the
ADS8321. This is true for all 16-bit SAR-type ADCs. Using
a histogram to plot the output codes, the distribution should
appear bell-shaped with the peak of the bell curve represent-
ing the nominal code for the input value. The
±1σ, ±2σ, and
±3σ distributions will represent the 68.3%, 95.5%, and
99.7%, respectively, of all codes. The transition noise can be
calculated by dividing the number of codes measured by 6
and this will yield the
±3σ distribution or 99.7% of all
codes. Statistically, up to 3 codes could fall outside the
distribution when executing 1000 conversions. The
ADS8321, with five output codes for the
±3σ distribution,
will yield a
±0.8LSB transition noise. Remember, to achieve
this low noise performance, the peak-to-peak noise of the
input signal and reference must be < 50
µV.
FIGURE 5. Histogram of 5,000 Conversions of a DC Input
at the Code Center.
13
1639
14
1260
192
15
Code
16
17
18
981
24
0
0
12
13
2318
14
836
696
15
Code
16
17
18
244
20
0
12


Số phần tương tự - ADS8321

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Burr-Brown (TI)
ADS8321 BURR-BROWN-ADS8321 Datasheet
100Kb / 12P
   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Texas Instruments
ADS8321 TI1-ADS8321 Datasheet
858Kb / 20P
[Old version datasheet]   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Burr-Brown (TI)
ADS8321E BURR-BROWN-ADS8321E Datasheet
100Kb / 12P
   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
ADS8321E/250 BURR-BROWN-ADS8321E/250 Datasheet
604Kb / 18P
   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
ADS8321E/2K5 BURR-BROWN-ADS8321E/2K5 Datasheet
604Kb / 18P
   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
More results

Mô tả tương tự - ADS8321

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Burr-Brown (TI)
ADS8321 BURR-BROWN-ADS8321 Datasheet
100Kb / 12P
   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Texas Instruments
ADS8321 TI1-ADS8321_14 Datasheet
858Kb / 20P
[Old version datasheet]   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Burr-Brown (TI)
ADS8321 BURR-BROWN-ADS8321_12 Datasheet
604Kb / 18P
   16-Bit, High Speed, MicroPower Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Texas Instruments
ADS8317 TI-ADS8317 Datasheet
802Kb / 29P
[Old version datasheet]   16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Burr-Brown (TI)
ADS8325 BURR-BROWN-ADS8325 Datasheet
444Kb / 21P
   16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
ADS8320 BURR-BROWN-ADS8320 Datasheet
105Kb / 13P
   16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Texas Instruments
ADS8320 TI1-ADS8320_14 Datasheet
876Kb / 22P
[Old version datasheet]   16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
ADS8326 TI1-ADS8326 Datasheet
1Mb / 39P
[Old version datasheet]   16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
ADS8320 TI1-ADS8320 Datasheet
875Kb / 21P
[Old version datasheet]   16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
ADS8325 TI1-ADS8325 Datasheet
1Mb / 36P
[Old version datasheet]   16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com