Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

AD7472BRU Scheda tecnica(PDF) 11 Page - Analog Devices

Il numero della parte AD7472BRU
Spiegazioni elettronici  1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7472BRU Scheda tecnica(HTML) 11 Page - Analog Devices

Back Button AD7472BRU Datasheet HTML 7Page - Analog Devices AD7472BRU Datasheet HTML 8Page - Analog Devices AD7472BRU Datasheet HTML 9Page - Analog Devices AD7472BRU Datasheet HTML 10Page - Analog Devices AD7472BRU Datasheet HTML 11Page - Analog Devices AD7472BRU Datasheet HTML 12Page - Analog Devices AD7472BRU Datasheet HTML 13Page - Analog Devices AD7472BRU Datasheet HTML 14Page - Analog Devices AD7472BRU Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
REV. A
AD7470/AD7472
–11–
OPERATING MODES
The AD7470 and AD7472 have two possible modes of opera-
tion depending on the state of the
CONVST pulse at the end of
a conversion, Mode 1 and Mode 2. There is a continuous clock
on the CLK IN pin.
Mode 1 (High Speed Sampling)
In this mode of operation the
CONVST pulse is brought high
before the end of conversion i.e., before the BUSY goes low (see
Figure 10). If the
CONVST pin is brought from high to low while
BUSY is high, the conversion is restarted. When operating in
this mode a new conversion should not be initiated until 135 ns
after BUSY goes low. This acquisition time allows the track/
hold circuit to accurately acquire the input signal. As mentioned
earlier, a read should not be done during a conversion. This
mode facilitates the fastest throughput times for the AD7470/
AD7472.
Mode 2 (Sleep Mode)
Figure 13 shows AD7470/AD7472 in Mode 2 operation where
the ADC goes into sleep mode after conversion. The
CONVST
line is brought low to initiate a conversion and remains low until
after the end of conversion. If
CONVST goes high and low
again while BUSY is high, the conversion is restarted. Once the
BUSY line goes from a high to a low, the
CONVST line has its
status checked and, if low, the part enters sleep mode.
The device wakes up again on the rising edge of the
CONVST
signal. There is a wake-up time of typically 1
µs after the rising
edge of
CONVST before the BUSY line can go high to indicate
start of conversion. BUSY will only go high once
CONVST goes
low. The
CONVST line can go from a high to a low during this
wake-up time, but the conversion will still not be initiated until
after the 1
µs wake-up time. Superior power performance can be
achieved in this mode of operation by waking up the AD7470
and AD7472 only to carry out a conversion.
Burst Mode
Burst mode on the AD7470/AD7472 is a subsection of Mode 1
and Mode 2, the clock is noncontinuous. Figure 12 shows how
the ADC works in burst mode for Mode 2. The clock needs
only to be switched on during conversion, minimum of 12 clock
cycles for the AD7470 and 14 clock cycles for the AD7472. As
the clock is off during nonconverting intervals, system power is
saved. The BUSY signal can be used to gate the CLK IN pulses.
The ADC does not begin the conversion process until the first
CONVST
BUSY
CS
RD
DBx
tWAKEUP
tCONVERT
Figure 13. Mode 2 Operation
CLK IN rising edge after BUSY goes high. The clock needs to
start less than two clock cycles away from the
CONVST active
edge otherwise INL deteriorates; e.g., if the clock frequency is
28 MHz the clock must start within 71.4 ns of
CONVST going
low. In Figure 12 the A-D converter section is put into sleep
mode once conversion is completed and on the rising edge of
CONVST it is woken up again; the user must be wary of the
wake-up time as this will reduce the sampling rate of the ADC.
VDRIVE
The VDRIVE pin is used as the voltage supply to the output driv-
ers and is a separate supply from AVDD and DVDD. The purpose
of using a separate supply for the output drivers is that the user
can vary the output high voltage, VOH, from the VDD supply to
the AD7470/AD7472. For example, if AVDD and DVDD is using
a 5 V supply, the VDRIVE pin can be powered from a 3 V supply.
The ADC has better dynamic performance at 5 V than at 3 V,
so operating the part at 5 V, while still being able to interface to
3 V parts, pushes the AD7470/AD7472 to the top bracket of
high performance 10-bit/12-bit A/Ds. Of course, the ADC can
have its VDRIVE and DVDD pins connected together and be pow-
ered from a 3 V or 5 V supply.
All outputs are powered from VDRIVE. These are all the data out
pins and the BUSY pin. The
CONVST, CS, RD and CLK IN
signals are related to the DVDD voltage.
POWER-UP
It is recommended that the user performs a dummy conversion
after power-up, as the first conversion result could be incorrect.
This also ensures that the parts is in the correct mode of opera-
tion. The recommended power-up sequence is as follows:
1 > GND
4 > Digital Inputs
2 > VDD
5 > REF IN
3 > VDRIVE
6 > VIN
Power vs. Throughput
The two modes of operation for the AD7470 and AD7472 will
produce different power versus throughput performances, Mode
1 and Mode 2; see Operating Modes section of the data sheet
for more detailed descriptions of these modes. Mode 2 is the
Sleep Mode of the part and it achieves the optimum power
performance.


Codice articolo simile - AD7472BRU

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Analog Devices
AD7472BRU AD-AD7472BRU Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
REV. B
AD7472BRU AD-AD7472BRU Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit-12-Bit Parallel ADCs
REV. B
AD7472BRU-REEL AD-AD7472BRU-REEL Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
REV. B
AD7472BRU-REEL AD-AD7472BRU-REEL Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit-12-Bit Parallel ADCs
REV. B
AD7472BRU-REEL7 AD-AD7472BRU-REEL7 Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
REV. B
More results

Descrizione simile - AD7472BRU

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Analog Devices
AD7472ARZ AD-AD7472ARZ Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit-12-Bit Parallel ADCs
REV. B
AD7472 AD-AD7472_15 Datasheet
529Kb / 21P
   1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
REV. B
AD7470 AD-AD7470_15 Datasheet
529Kb / 21P
   1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
REV. B
AD7470 AD-AD7470_03 Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
REV. B
AD7934BRUZ-REEL7 AD-AD7934BRUZ-REEL7 Datasheet
768Kb / 32P
   4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer
REV. B
AD7933 AD-AD7933_15 Datasheet
768Kb / 32P
   4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer
REV. B
AD7933 AD-AD7933 Datasheet
1Mb / 32P
   4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
Rev.PrG
AD7934 AD-AD7934_15 Datasheet
768Kb / 32P
   4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer
REV. B
AD7475 AD-AD7475_V01 Datasheet
519Kb / 24P
   1 MSPS,12-Bit ADCs
Rev. D
AD7475 AD-AD7475 Datasheet
218Kb / 16P
   1 MSPS, 12-Bit ADCs
REV. A
More results


Html Pages

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


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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