Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

AD7829BR-REEL7 Datasheet(PDF) 10 Page - Analog Devices

No. de pieza AD7829BR-REEL7
Descripción Electrónicos  3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7829BR-REEL7 Datasheet(HTML) 10 Page - Analog Devices

Back Button AD7829BR-REEL7 Datasheet HTML 6Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 7Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 8Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 9Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 10Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 11Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 12Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 13Page - Analog Devices AD7829BR-REEL7 Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 28 page
background image
AD7822/AD7825/AD7829
Rev. C | Page 10 of 28
CIRCUIT INFORMATION
CIRCUIT DESCRIPTION
The AD7822/AD7825/AD7829 consist of a track-and-hold
amplifier followed by a half-flash analog-to-digital converter.
These devices use a half-flash conversion technique where one
4-bit flash ADC is used to achieve an 8-bit result. The 4-bit flash
ADC contains a sampling capacitor followed by 15 comparators
that compare the unknown input to a reference ladder to
achieve a 4-bit result. This first flash (that is, coarse conversion)
provides the four MSBs. For a full 8-bit reading to be realized,
a second flash (that is, fine conversion) must be performed to
provide the four LSBs. The 8-bit word is then placed on the data
output bus.
Figure 6 and Figure 7 show simplified schematics of the ADC.
When the ADC starts a conversion, the track-and-hold goes
into hold mode and holds the analog input for 120 ns. This is
the acquisition phase, as shown in Figure 6, when Switch 2 is in
Position A. At the point when the track-and-hold returns to its
track mode, this signal is sampled by the sampling capacitor,
as Switch 2 moves into Position B. The first flash occurs at this
instant and is then followed by the second flash. Typically, the
first flash is complete after 100 ns, that is, at 220 ns; and the end
of the second flash and, hence, the 8-bit conversion result is
available at 330 ns (minimum). The maximum conversion time
is 420 ns. As shown in Figure 8, the track-and-hold returns to
track mode after 120 ns and starts the next acquisition before
the end of the current conversion. Figure 10 shows the ADC
transfer function.
TIMING AND
CONTROL
LOGIC
R1
HOLD
SAMPLING
CAPACITOR
A
B
SW2
R16
R15
R14
R13
T/H 1
VIN
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
14
15
13
1
REFERENCE
Figure 6. ADC Acquisition Phase
TIMING AND
CONTROL
LOGIC
R1
HOLD
SAMPLING
CAPACITOR
A
B
SW2
R16
R15
R14
R13
T/H 1
VIN
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
14
15
13
1
REFERENCE
Figure 7. ADC Conversion Phase
HOLD
HOLD
120ns
CONVST
EOC
CS
RD
DB0 TO DB7
t2
TRACK
TRACK
VALID
DATA
t1
t3
Figure 8. Track-and-Hold Timing
TYPICAL CONNECTION DIAGRAM
Figure 9 shows a typical connection diagram for the AD7822/
AD7825/AD7829. The AGND and DGND are connected
together at the device for good noise suppression. The parallel
interface is implemented using an 8-bit data bus. The end of
conversion signal (EOC) idles high, the falling edge of CONVST
initiates a conversion, and at the end of conversion the falling
edge of EOC is used to initiate an interrupt service routine
(ISR) on a microprocessor (see the Parallel Interface section for
more details.) VREF and VMID are connected to a voltage source
such as the AD780, and VDD is connected to a voltage source
that can vary from 4.5 V to 5.5 V (see Table 5 in the Analog Input
section). When VDD is first connected, the AD7822/AD7825/
AD7829 power up in a low current mode, that is, power-down
mode, with the default logic level on the EOC pin on the
AD7822 and AD7825 equal to a low. Ensure the CONVST line is
not floating when VDD is applied, because this can put the
AD7822/AD7825/AD7829 into an unknown state.


Número de pieza similar - AD7829BR-REEL7

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Analog Devices
AD7829BR AD-AD7829BR Datasheet
240Kb / 20P
   3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs
REV. B
AD7829BRU AD-AD7829BRU Datasheet
240Kb / 20P
   3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs
REV. B
AD7829BRU-1 AD-AD7829BRU-1 Datasheet
390Kb / 20P
   3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC
REV. 0
AD7829BRU-1 AD-AD7829BRU-1 Datasheet
361Kb / 21P
   3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC
AD7829BRU-1REEL7 AD-AD7829BRU-1REEL7 Datasheet
390Kb / 20P
   3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC
REV. 0
More results

Descripción similar - AD7829BR-REEL7

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Analog Devices
AD7825 AD-AD7825_15 Datasheet
525Kb / 28P
   3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
REV. C
AD7829 AD-AD7829_15 Datasheet
525Kb / 28P
   3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
REV. C
AD7822 AD-AD7822 Datasheet
240Kb / 20P
   3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs
REV. B
AD7822 AD-AD7822_15 Datasheet
525Kb / 28P
   3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
REV. C
AD7829-1 AD-AD7829-1_15 Datasheet
390Kb / 20P
   3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC
REV. 0
AD7829-1 AD-AD7829-1 Datasheet
390Kb / 20P
   3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC
REV. 0
AD7829-1 AD-AD7829-1_17 Datasheet
361Kb / 21P
   3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC
AD7827 AD-AD7827_15 Datasheet
189Kb / 12P
   3 V/5 V, 1 MSPS, 8-Bit, Serial Interface Sampling ADC
REV. 0
AD7827 AD-AD7827 Datasheet
185Kb / 12P
   3 V/5 V, 1 MSPS, 8-Bit, Serial Interface Sampling ADC
REV. 0
AD7859 AD-AD7859_15 Datasheet
405Kb / 28P
   3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADCs
REV. A
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 25 26 27 28


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   Lista de Fabricantes
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