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

X  

ADS7816EB2K5 bảng dữ liệu(PDF) 11 Page - Texas Instruments

tên linh kiện ADS7816EB2K5
Giải thích chi tiết về linh kiện  12-Bit High Speed Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  TI [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI - Texas Instruments

ADS7816EB2K5 bảng dữ liệu(HTML) 11 Page - Texas Instruments

Back Button ADS7816EB2K5 Datasheet HTML 7Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 8Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 9Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 10Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 11Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 12Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 13Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 14Page - Texas Instruments ADS7816EB2K5 Datasheet HTML 15Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 24 page
background image
11
®
ADS7816
converter not only uses power on each DCLOCK transition
(as is typical for digital CMOS components) but also uses
some current for the analog circuitry, such as the compara-
tor. The analog section dissipates power continuously, until
the power down mode is entered.
Figure 3 shows the current consumption of the ADS7816
versus sample rate. For this graph, the converter is clocked
at 3.2MHz regardless of the sample rate—CS is HIGH for
the remaining sample period. Figure 4 also shows current
consumption versus sample rate. However, in this case, the
DCLOCK period is 1/16th of the sample period—CS is
HIGH for one DCLOCK cycle out of every 16.
There is an important distinction between the power down
mode that is entered after a conversion is complete and the
full power down mode which is enabled when CS is HIGH.
While both power down the analog section, the digital section
is powered down only when CS is HIGH. Thus, if CS is left
LOW at the end of a conversion and the converter is continu-
ally clocked, the power consumption will not be as low as
when CS is HIGH. See Figure 5 for more information.
By lowering the reference voltage, the ADS7816 requires
less current to completely charge its internal capacitors on
both the analog input and the reference input. This reduction
in power dissipation should be weighed carefully against the
resulting increase in noise, offset, and gain error as outlined
in the Reference section. The power dissipation of the
ADS7816 is reduced roughly 10% when the reference volt-
age and input range are changed from 5V to 100mV.
SHORT CYCLING
Another way of saving power is to utilize the CS signal to
short cycle the conversion. Because the ADS7816 places the
latest data bit on the DOUT line as it is generated, the
converter can easily be short cycled. This term means that
the conversion can be terminated at any time. For example,
if only 8-bits of the conversion result are needed, then the
conversion can be terminated (by pulling CS HIGH) after
the 8th bit has been clocked out.
This technique can be used to lower the power dissipation
(or to increase the conversion rate) in those applications
where an analog signal is being monitored until some con-
dition becomes true. For example, if the signal is outside a
predetermined range, the full 12-bit conversion result may
not be needed. If so, the conversion can be terminated after
the first n-bits, where n might be as low as 3 or 4. This
results in lower power dissipation in both the converter and
the rest of the system, as they spend more time in the power
down mode.
LAYOUT
For optimum performance, care should be taken with the
physical layout of the ADS7816 circuitry. This is particularly
true if the reference voltage is low and/or the conversion rate
is high. At 200kHz conversion rate, the ADS7816 makes a bit
decision every 312ns. That is, for each subsequent bit deci-
1000
100
10
1
1
10
100
1000
Sample Rate (kHz)
T
A = 25°C
V
CC = VREF = +5V
f
CLK = 3.2MHz
FIGURE 3. Maintaining fCLK at the Highest Possible Rate
Allows Supply Current to Drop Directly with
Sample Rate.
1000
100
10
1
1
10
100
1000
Sample Rate (kHz)
T
A = 25°C
V
CC = VREF = +5V
f
CLK = 16 • fSAMPLE
FIGURE 4. Scaling fCLK Reduces Supply Current Only
Slightly with Sample Rate.
FIGURE 5. Shutdown Current is Considerably Lower with
CS HIGH than when CS is LOW.
60
50
40
30
20
10
0
1
10
100
1000
Sample Rate (kHz)
T
A = 25°C
V
CC = VREF = +5V
f
CLK = 16 • fSAMPLE
CS LOW
(GND)
CS = HIGH (V
CC)


Số phần tương tự - ADS7816EB2K5

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Texas Instruments
ADS7816EB2K5 TI-ADS7816EB2K5 Datasheet
931Kb / 23P
[Old version datasheet]   12-Bit High Speed Micro Power Sampling
ADS7816EB2K5G4 TI-ADS7816EB2K5G4 Datasheet
931Kb / 23P
[Old version datasheet]   12-Bit High Speed Micro Power Sampling
More results

Mô tả tương tự - ADS7816EB2K5

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Texas Instruments
ADS7816U TI1-ADS7816U Datasheet
951Kb / 23P
[Old version datasheet]   12-Bit High Speed Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Burr-Brown (TI)
ADS7816 BURR-BROWN-ADS7816 Datasheet
226Kb / 13P
   12-Bit High Speed Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Texas Instruments
ADS7816P TI1-ADS7816P Datasheet
951Kb / 23P
[Old version datasheet]   12-Bit High Speed Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Burr-Brown (TI)
ADS1286 BURR-BROWN-ADS1286 Datasheet
165Kb / 11P
   12-Bit Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Texas Instruments
ADS1286 TI1-ADS1286_14 Datasheet
491Kb / 18P
[Old version datasheet]   12-Bit Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
ADS1286 TI1-ADS1286_16 Datasheet
483Kb / 17P
[Old version datasheet]   12-Bit Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Burr-Brown (TI)
ADS1286 BURR-BROWN-ADS1286_06 Datasheet
141Kb / 14P
   12-Bit Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
ADS1286 BURR-BROWN-ADS1286_12 Datasheet
479Kb / 18P
   12-Bit Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
logo
Texas Instruments
ADS7835 TI1-ADS7835_14 Datasheet
840Kb / 21P
[Old version datasheet]   12-Bit, High-Speed, Low Power Sampling ANALOG-TO-DIGITAL CONVERTER
ADS7834 TI1-ADS7834_14 Datasheet
966Kb / 22P
[Old version datasheet]   12-Bit High-Speed, Low-Power 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 20 21 22 23 24


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