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Analog Devices - +3.3 V to +5 V Quad/Octal 10-Bit DACs

Numéro de référence AD7808
Description +3.3 V to +5 V Quad/Octal 10-Bit DACs
Fabricant Analog Devices 
Logo Analog Devices 





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AD7808 fiche technique
a +3.3 V to +5 V Quad/Octal 10-Bit DACs
AD7804/AD7805/AD7808/AD7809*
FEATURES
Four 10-Bit DACs in One Package
Serial and Parallel Loading Facilities Available
AD7804 Quad 10-Bit Serial Loading
AD7805 Quad 10-Bit Parallel Loading
AD7808 Octal 10-Bit Serial Loading
AD7809 Octal 10-Bit Parallel Loading
+3.3 V to +5 V Operation
Power-Down Mode
Power-On Reset
Standby Mode (All DACs/Individual DACs)
Low Power All CMOS Construction
10-Bit Resolution
Double Buffered DAC Registers
Dual External Reference Capability
APPLICATIONS
Optical Disk Drives
Instrumentation and Communication Systems
Process Control and Voltage Setpoint Control
Trim Potentiometer Replacement
Automatic Calibration
GENERAL DESCRIPTION
The AD7804/AD7808 are quad/octal 10-bit digital-to-analog
converters, with serial load capabilities, while the AD7805/AD7809
are quad/octal 10-bit digital-to-analog converters with parallel
load capabilities. These parts operate from a +3.3 V to +5 V
(±10%) power supply and incorporates an on-chip reference.
These DACs provide output signals in the form of VBIAS ± VSWING.
VSWING is derived internally from VBIAS. On-chip control registers
include a system control register and channel control registers.
The system control register has control over all DACs in the
package. The channel control registers allow individual control
of DACs. The complete transfer function of each individual
DAC can be shifted around the VBIAS point using an on-chip
Sub DAC. All DACs contain double buffered data inputs,
which allow all analog outputs to be simultaneously updated
using the asynchronous LDAC input.
Control Features Channels Controlled Main DAC Sub DAC
Hardware Clear
System Control
Power Down1
System Standby2
System Clear
Input Coding
Channel Control
Channel Standby2
Channel Clear
VBIAS
All
All
All
All
All
Selective
Selective
Selective
͙͙
͙͙
͙͙
͙
͙͙
͙͙
͙
͙͙
NOTES
1Power-down function powers down all internal circuitry including the reference.
2Standby functions power down all circuitry except for the reference.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAMS
REFOUT
REFIN
COMP
1.23V REF
AVDD
DIVIDER
AVDD DVDD AGND DGND
POWER ON
RESET AD7804/
AD7808
VBIAS
MUX
DAC D
VOUTF*
VOUTE*
VOUTD
CHANNEL D
CONTROL REG
DATA
REGISTER
DAC
REGISTER
VBIAS
MUX
DAC C
VOUTC
CHANNEL C
CONTROL REG
DATA
REGISTER
DAC
REGISTER
VBIAS
MUX
DAC B
VOUTB
CHANNEL B
CONTROL REG
DATA
REGISTER
DAC
REGISTER
VBIAS
MUX
DAC A
PD**
CHANNEL A
CONTROL REG
DATA
REGISTER
DAC
REGISTER
FSIN
CLKIN
SDIN
SYSTEM
CONTROL REG
INPUT SHIFT
REGISTER &
CONTROL LOGIC
**ONLY AD7804 SHOWN FOR CLARITY
CLR LDAC
**SHOWS ADDITIONAL CHANNELS ON THE AD7808
**PIN ON THE AD7808 ONLY
VOUTA
VOUTH*
VOUTG*
REFOUT
REFIN
COMP
1.23V REF
AVDD
DIVIDER
AVDD DVDD AGND DGND
POWER ON
RESET
AD7805/
AD7809
VBIAS
MUX
DAC D
CHANNEL D
CONTROL REG
DATA
REGISTER
DAC
REGISTER
VBIAS
MUX
DAC C
VOUTF*
VOUTE*
VOUTD
VOUTC
CHANNEL C
CONTROL REG
DATA
REGISTER
DAC
REGISTER
VBIAS
MUX
DAC B
VOUTB
CHANNEL B
CONTROL REG
DATA
REGISTER
DAC
REGISTER
VBIAS
MUX
DAC A
VOUTA
PD**
CS
WR
CHANNEL A
CONTROL REG
DATA
DAC
REGISTER REGISTER
SYSTEM
CONTROL REG
CONTROL
LOGIC
INPUT
REGISTER
MODE A0 A1 A2** DB9 DB2 DB1 DB0 CLR LDAC
**ONLY AD7805 SHOWN FOR CLARITY
**SHOWS ADDITIONAL CHANNELS ON THE AD7809
**PIN ON THE AD7809 ONLY
*Patent pending.
Index on Page 26.
VOUTH*
VOUTG*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998

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