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

X  

AD7840AQ Datasheet(PDF) 11 Page - Analog Devices

No. de pieza AD7840AQ
Descripción Electrónicos  LC2MOS Complete 14-Bit DAC
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7840AQ Datasheet(HTML) 11 Page - Analog Devices

Back Button AD7840AQ Datasheet HTML 7Page - Analog Devices AD7840AQ Datasheet HTML 8Page - Analog Devices AD7840AQ Datasheet HTML 9Page - Analog Devices AD7840AQ Datasheet HTML 10Page - Analog Devices AD7840AQ Datasheet HTML 11Page - Analog Devices AD7840AQ Datasheet HTML 12Page - Analog Devices AD7840AQ Datasheet HTML 13Page - Analog Devices AD7840AQ Datasheet HTML 14Page - Analog Devices AD7840AQ Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
AD7840
REV. B
–11–
AD7840–68000 Interface
An interface between the AD7840 and the 68000 microproces-
sor is shown in Figure 19. In this interface example, the LDAC
input is hardwired low. As a result the DAC latch and analog
output are updated on the rising edge of WR. A single move
instruction, therefore, loads the input latch and updates the output.
MOVE.W D0,$DAC
D0 = 68000 D0 Register
DAC = AD7840 Address
Figure 19. AD7840–MC68000 Parallel Interface
Serial Interfacing
Figures 20 to 23 show the AD7840 configured for serial inter-
facing with the CS input hardwired to –5 V. The parallel bus is
not activated during serial communication with the AD7840.
AD7840–ADSP-2101/ADSP-2102 Serial Interface
Figure 20 shows a serial interface between the AD7840 and the
ADSP-2101/ADSP-2102 DSP processor. Also included in the
interface is the AD7870, a 12-bit A/D converter. An interface
such as this is suitable for modem and other applications which
have a DAC and an ADC in serial communication with a
microprocessor.
The interface uses just one of the two serial ports of the
ADSP-2101/ADSP-2102. Conversion is initiated on the
AD7870 at a fixed sample rate (e.g., 9.6 kHz) which is provided
by a timer or clock recovery circuitry. While communication
takes place between the ADC and the ADSP-2101/ ADSP-2102,
the AD7870 SSTRB line is low. This SSTRB line is used to
provide a frame synchronization pulse for the AD7840 SYNC
and ADSP-2101/ADSP-2102 TFS lines. This means that com-
munication between the processor and the AD7840 can only
take place while the AD7870 is communicating with the processor.
This arrangement is desirable in systems such as modems where
the DAC and ADC communication should be synchronous.
The use of the AD7870 SCLK for the AD7840 SCLK and
ADSP-2101/ADSP-2102 SCLK means that only one serial port
of the processor is used. The serial clock for the AD7870 must
be set for continuous clock for correct operation of this interface.
Data from the ADSP-2101/ADSP-2102 is valid on the falling
edge of SCLK. The LDAC input of the AD7840 is permanently
low so the update of the DAC latch and analog output takes
place on the sixteenth falling edge of SCLK (with SYNC low).
The FORMAT pin of the AD7840 must be tied to +5 V and
the JUSTIFY pin tied to DGND for this interface to operate
correctly.
Figure 20. Complete DAC/ADC Serial Interface
AD7840–DSP56000 Serial Interface
A serial interface between the AD7840 and the DSP56000 is
shown in Figure 21. The DSP56000 is configured for normal
mode synchronous operation with gated clock. It is also set up
for a 16-bit word with SCK and SC2 as outputs and the FSL
control bit set to a 0. SCK is internally generated on the
DSP56000 and applied to the AD7840 SCLK input. Data from
the DSP56000 is valid on the falling edge of SCK. The SC2
output provides the framing pulse for valid data. This line must
be inverted before being applied to the SYNC input of the
AD7840.
The LDAC input of the AD7840 is connected to DGND so the
update of the DAC latch takes place on the sixteenth falling
edge of SCLK. As with the previous interface, the FORMAT
pin of the AD7840 must be tied to +5 V and the JUSTIFY pin
tied to DGND.
Figure 21. AD7840–DSP56000 Serial Interface


Número de pieza similar - AD7840AQ

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Analog Devices
AD7840 AD-AD7840_15 Datasheet
339Kb / 16P
   LC MOS Complete 14-Bit DAC
REV. B
More results

Descripción similar - AD7840AQ

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Analog Devices
AD7845 AD-AD7845 Datasheet
195Kb / 12P
   LC2MOS Complete 12-Bit Multiplying DAC
REV. B
AD7836 AD-AD7836 Datasheet
174Kb / 12P
   LC2MOS Quad 14-Bit DAC
REV. A
AD7834 AD-AD7834 Datasheet
404Kb / 16P
   LC2MOS Quad 14-Bit DAC
REV. A
AD7836ASZ AD-AD7836ASZ Datasheet
176Kb / 12P
   LC2MOS Quad 14-Bit DAC
REV. A
AD7872KRZ-REEL AD-AD7872KRZ-REEL Datasheet
324Kb / 16P
   LC2MOS Complete 14-Bit, Sampling ADCs
REV. D
AD7871 AD-AD7871 Datasheet
344Kb / 16P
   LC2MOS Complete 14-Bit, Sampling ADCs
REV. D
AD7872JRZ AD-AD7872JRZ Datasheet
267Kb / 16P
   LC2MOS Complete 14-Bit, Sampling ADCs
REV. D
AD7538JRZ AD-AD7538JRZ Datasheet
306Kb / 16P
   LC2MOS Microprocessor-Compatible 14-Bit DAC
REV. B
AD7535 AD-AD7535 Datasheet
496Kb / 12P
   LC2MOS uP-COMPATIBLE 14-BIT DAC
REV. A
AD7536 AD-AD7536 Datasheet
620Kb / 12P
   LC2MOS 14-BIT uP-COMPATIBLE DAC
More results


Html Pages

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


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