Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

AD9281-EB Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD9281-EB
Szczegółowy opis  Dual Channel 8-Bit Resolution CMOS ADC
Download  19 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD9281-EB Arkusz danych(HTML) 10 Page - Analog Devices

Back Button AD9281-EB Datasheet HTML 6Page - Analog Devices AD9281-EB Datasheet HTML 7Page - Analog Devices AD9281-EB Datasheet HTML 8Page - Analog Devices AD9281-EB Datasheet HTML 9Page - Analog Devices AD9281-EB Datasheet HTML 10Page - Analog Devices AD9281-EB Datasheet HTML 11Page - Analog Devices AD9281-EB Datasheet HTML 12Page - Analog Devices AD9281-EB Datasheet HTML 13Page - Analog Devices AD9281-EB Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 19 page
background image
AD9281
–10–
REV. E
REFERENCE AND REFERENCE BUFFER
The reference and buffer circuitry on the AD9281 is configured
for maximum convenience and flexibility. An illustration of the
equivalent reference circuit is show in Figure 26. The user can
select from five different reference modes through appropriate
pin-strapping (see Table I below). These pin strapping options
cause the internal circuitry to reconfigure itself for the appropri-
ate operating mode.
Table I. Table of Modes
Mode
Input Span
REFSENSE Pin Figure
1 V
1 V
VREF
22
2 V
2 V
AGND
23
Programmable
1 + (R1/R2)
See Figure
24
External
= External Ref
AVDD
25
1 V Mode (Figure 22)
—provides a 1 V reference and 1 V input
full scale. Recommended for applications wishing to optimize
high frequency performance, or any circuit on a supply voltage
of less than 4 V. The part is placed in this mode by shorting the
REFSENSE pin to the VREF pin.
I OR QREFT
I OR QREFB
IINA
IINB
VREF
0.1 F10 F
0.1 F
0.1 F
0.1 F
AD9281
0.1 F
10 F
10 F
1V
0V
QINB
QINA
5k
5k
REFSENSE
1V
0V
1V
Figure 22. 0 V to 1 V Input
2 V Mode (Figure 23)
—provides a 2 V reference and 2 V input
full scale. Recommended for noise sensitive applications on 5 V
supplies. The part is placed in 2 V reference mode by ground-
ing (shorting to AVSS) the REFSENSE pin.
I OR QREFT
I OR QREFB
IINA
IINB
VREF
0.1 F10 F
0.1 F
0.1 F
0.1 F
AD9281
0.1 F
10 F
10 F
2V
0V
QINB
QINA
5k
5k
REFSENSE
2V
0V
Figure 23. 0 V to 2 V Input
Externally Set Voltage Mode (Figure 24)
—this mode uses
the on-chip reference, but scales the exact reference level though
the use of an external resistor divider network. VREF is wired to
the top of the network, with the REFSENSE wired to the tap
point in the resistor divider. The reference level (and input full
scale) will be equal to 1 V
× (R1 + R2)/R1. This method can be
used for voltage levels from 0.7 V to 2.5 V.
I OR QREFT
I OR QREFB
VREF
0.1 F10 F
0.1 F
0.1 F
AD9281
REFSENSE
+ –
AVSS
0.1 F
1 F
R2
R1
1V
VREF = 1 +
R2
R1
Figure 24. Programmable Reference
External Reference Mode (Figure 25)
—in this mode, the on-
chip reference is disabled, and an external reference applied to
the VREF pin. This mode is achieved by tying the REFSENSE
pin to AVDD.
1V
EXT
REFERENCE
AVDD
I OR QREFT
I OR QREFB
IINA
IINB
VREF
0.1 F10 F
0.1 F
0.1 F
0.1 F
AD9281
0.1 F
10 F
10 F
1V
0V
QINB
QINA
5k
5k
REFSENSE
1V
0V
Figure 25. External Reference
Reference Buffer
—The reference buffer structure takes the
voltage on the VREF pin and level-shifts and buffers it for use
by various sub-blocks within the two A/D converters. The two
converters share the same reference buffer amplifier to maintain
the best possible gain match between the two converters. In the
interests of minimizing high frequency crosstalk, the buffered
references for the two converters are separately decoupled on
the IREFB, IREFT, QREFB and QREFT pins, as illustrated in
Figure 26.


Podobny numer części - AD9281-EB

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Analog Devices
AD9281-EB AD-AD9281-EB Datasheet
902Kb / 28P
   High Speed ADC USB FIFO Evaluation Kit
REV. 0
More results

Podobny opis - AD9281-EB

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Analog Devices
AD9281ARSRL AD-AD9281ARSRL Datasheet
329Kb / 15P
   Dual Channel 8-Bit Resolution CMOS ADC
REV. F
AD9281ARSZ AD-AD9281ARSZ Datasheet
329Kb / 15P
   Dual Channel 8-Bit Resolution CMOS ADC
Rev. F
AD9281 AD-AD9281_15 Datasheet
329Kb / 15P
   Dual Channel 8-Bit Resolution CMOS ADC
REV. F
AD9201ARSZ AD-AD9201ARSZ Datasheet
75Kb / 4P
   Dual Channel, 20 MHz 10-Bit Resolution CMOS ADC
REV. D
AD9201 AD-AD9201 Datasheet
431Kb / 20P
   Dual Channel, 20 MHz 10-Bit Resolution CMOS ADC
REV. D
AD9281 AD-AD9281_17 Datasheet
411Kb / 16P
   Resolution CMOS ADC
AD9201 AD-AD9201_17 Datasheet
467Kb / 21P
   Resolution CMOS ADC
logo
Maxim Integrated Produc...
MAX19506 MAXIM-MAX19506_V01 Datasheet
1Mb / 35P
   Dual-Channel, 8-Bit, 100Msps ADC
2010
MAX19505 MAXIM-MAX19505 Datasheet
454Kb / 34P
   Dual-Channel, 8-Bit, 65Msps ADC
Rev 0; 10/08
MAX19507 MAXIM-MAX19507 Datasheet
417Kb / 34P
   Dual-Channel, 8-Bit, 130Msps ADC
Rev 0; 10/08
More results


Html Pages

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


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