Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

AD7492AR-5 Arkusz danych(PDF) 9 Page - Analog Devices

Numer części AD7492AR-5
Szczegółowy opis  1.25 MSPS, 16 mW Internal REF and CLK, 12-Bit Parallel ADC
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD7492AR-5 Arkusz danych(HTML) 9 Page - Analog Devices

Back Button AD7492AR-5 Datasheet HTML 5Page - Analog Devices AD7492AR-5 Datasheet HTML 6Page - Analog Devices AD7492AR-5 Datasheet HTML 7Page - Analog Devices AD7492AR-5 Datasheet HTML 8Page - Analog Devices AD7492AR-5 Datasheet HTML 9Page - Analog Devices AD7492AR-5 Datasheet HTML 10Page - Analog Devices AD7492AR-5 Datasheet HTML 11Page - Analog Devices AD7492AR-5 Datasheet HTML 12Page - Analog Devices AD7492AR-5 Datasheet HTML 13Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 16 page
background image
REV. 0
AD7492
–9–
CODE
1
0
–1
0
4089
–0.8
3578
3067
2556
2045
1534
1023
512
–0.6
–0.4
–0.2
0.2
0.4
0.6
0.8
TPC 7. Typical INL for 2.75 V @ 25
°C
CODE
1
0
–1
0
4089
–0.8
3578
3067
2556
2045
1534
1023
512
–0.6
–0.4
–0.2
0.2
0.4
0.6
0.8
TPC 8. Typical DNL for 2.75 V @ 25
°C
CIRCUIT DESCRIPTION
CONVERTER OPERATION
The AD7492 is a 12-bit successive approximation analog-to-
digital converter based around a capacitive DAC. The AD7492
can convert analog input signals in the range 0 V to VREF. Figure 2
shows a very simplified schematic of the ADC. The Control
Logic, SAR, and the Capacitive DAC are used to add and sub-
tract fixed amounts of charge from the sampling capacitor to
bring the comparator back into a balanced condition.
CAPACITIVE
DAC
SWITCHES
SAR
CONTROL LOGIC
COMPARATOR
OUTPUT DATA
12-BIT PARALLEL
VIN
VREF
CONTROL
INPUTS
Figure 2. Simplified Block Diagram of AD7492
Figure 3 shows the ADC during its acquisition phase. SW2 is
closed and SW1 is in Position A. The comparator is held in a
balanced condition and the sampling capacitor acquires the
signal on VIN.
COMPARATOR
VIN
CONTROL LOGIC
CAPACITIVE
DAC
AGND
2k
SW2
SW1
A
B
Figure 3. ADC Acquisition Phase
Figure 4 shows the ADC during conversion. When conversion
starts, SW2 will open and SW1 will move to Position B, causing
the comparator to become unbalanced. The ADC then runs
through its successive approximation routine and brings the com-
parator back into a balanced condition. When the comparator is
rebalanced, the conversion result is available in the SAR register.
COMPARATOR
VIN
CONTROL LOGIC
CAPACITIVE
DAC
AGND
2k
SW2
SW1
A
B
Figure 4. ADC Conversion Phase
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7492.
Conversion is initiated by a falling edge on
CONVST. Once
CONVST goes low the BUSY signal goes high, and at the end
of conversion the falling edge of BUSY is used to activate an
Interrupt Service Routine. The
CS and RD lines are then activated
in parallel to read the 12 data bits. The internal bandgap reference
voltage is 2.5 V, providing an analog input range of 0 V to 2.5 V,
making the AD7492 a unipolar A/D. A capacitor with a mini-
mum capacitance of 100 nF is needed at the output of the REF
OUT pin as it stabilizes the internal reference value. It is recom-
mended to perform a dummy conversion after power-up as the
first conversion result could be incorrect. This also ensures that
the part is in the correct mode of operation. The
CONVST pin
should not be floating when power is applied as a rising edge on
CONVST might not wake up the part.
In Figure 5 the VDRIVE pin is tied to DVDD, which results in logic
output voltage values being either 0 V or DVDD. The voltage
applied to VDRIVE controls the voltage value of the output logic
signals and the input logic signals. For example, if DVDD is
supplied by a 5 V supply and VDRIVE by a 3 V supply, the logic
output voltage levels would be either 0 V or 3 V. This feature
allows the AD7492 to interface to 3 V parts while still enabling
the A/D to process signals at 5 V supply.


Podobny numer części - AD7492AR-5

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Analog Devices
AD7492AR-5-REEL7 AD-AD7492AR-5-REEL7 Datasheet
513Kb / 24P
   1.25 MSPS, 16 mW Internal REF and CLK, 12-Bit Parallel ADC
REV. A
AD7492AR-5-REEL7 AD-AD7492AR-5-REEL7 Datasheet
374Kb / 25P
   1.25 MSPS, 16 mW Internal REF 12-Bit Parallel ADC
More results

Podobny opis - AD7492AR-5

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Analog Devices
AD7492ARZ AD-AD7492ARZ Datasheet
513Kb / 24P
   1.25 MSPS, 16 mW Internal REF and CLK, 12-Bit Parallel ADC
REV. A
AD7492 AD-AD7492_15 Datasheet
513Kb / 24P
   1.25 MSPS, 16 mW Internal REF and CLK, 12-Bit Parallel ADC
REV. A
AD7492BRUZ AD-AD7492BRUZ Datasheet
513Kb / 24P
   1.25 MSPS, 16 mW Internal REF and CLK, 12-Bit Parallel ADC
REV. A
AD7492 AD-AD7492_17 Datasheet
374Kb / 25P
   1.25 MSPS, 16 mW Internal REF 12-Bit Parallel ADC
logo
Texas Instruments
ADS9120 TI1-ADS9120 Datasheet
1Mb / 64P
[Old version datasheet]   16-Bit, 2.5-MSPS, 15.5-mW, SAR ADC
logo
Analog Devices
AD7667 AD-AD7667 Datasheet
336Kb / 23P
   16-Bit 1 MSPS SAR Unipolar ADC with Ref
REV. PrA
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
AD7470 AD-AD7470 Datasheet
197Kb / 16P
   1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs
REV. A
AD7472ARZ AD-AD7472ARZ Datasheet
325Kb / 20P
   1.75 MSPS, 4 mW 10-Bit-12-Bit Parallel ADCs
REV. B
More results


Html Pages

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


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
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