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PDF DAC8426 Data sheet ( Hoja de datos )

Número de pieza DAC8426
Descripción Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



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No Preview Available ! DAC8426 Hoja de datos, Descripción, Manual

a
Quad 8-Bit Voltage Out CMOS DAC
Complete with Internal 10 V Reference
DAC8426
FEATURES
No Adjustments Required, Total Error ؎1 LSB Max
Over Temperature
Four Voltage-Output DACs on a Single Chip
Internal 10 V Bandgap Reference
Operates from Single ؉15 V Supply
Fast 50 ns Data Load Time, All Temperatures
Pin-for-Pin Replacement for PM-7226 and AD7226,
Eliminates External Reference
APPLICATIONS
Process Controls
Multichannel Microprocessor Controlled:
System Calibration
Op Amp Offset and Gain Adjust
Level and Threshold Setting
GENERAL DESCRIPTION
The DAC8426 is a complete quad voltage output D/A converter
with internal reference. This product fits directly into any exist-
ing 7226 socket where the user currently has a 10 V external
reference. The external reference is no longer necessary. The
internal reference of the DAC8426 is laser-trimmed to ± 0.4%
offering a 25 ppm/°C temperature coefficient and 5 mA of exter-
nal load driving capability.
The DAC8426 contains four 8-bit voltage-output CMOS D/A
converters on a single chip. A 10 V output bandgap reference
sets the output full-scale voltage. The circuit also includes four
input latches and interface control logic.
One of the four latches, selected by the address inputs, is loaded
from the 8-bit data bus input when the write strobe is active
low. All digital inputs are TTL/CMOS (5 V) compatible. The
on-board amplifiers can drive up to 10 mA from either a single
or dual supply. The on-board reference that is always connected
to the internal DACs has 5 mA available to drive external devices.
Its compact size, low power, and economical cost-per-channel,
make the DAC8426 attractive for applications requiring mul-
tiple D/A converters without sacrificing circuit-board space. Sys-
tem reliability is also increased due to reduced parts count.
PMI’s advanced oxide-based, silicon-gate, CMOS process al-
lows the DAC8426’s analog and digital circuitry to be manufac-
tured on the same chip. This, coupled with PMI’s highly stable
thin-film R-2R resistor ladder, aids in matching and tempera-
ture tracking between DACs.
FUNCTIONAL BLOCK DIAGRAM
REV. C
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

1 page




DAC8426 pdf
Typical Performance Characteristics–DAC8426
Channel-to-Channel Matching (DACs
A, B, C, D, Superimposed)
Relative Accuracy vs. Code
at TA = –55°C, +25°C, +125°C
(All Superimposed)
Zero Code Error vs. Temperature
Long Term Drift Accelerated by
Burn-In
VOUT Noise Density vs. Frequency
Broadband Noise (DC to 200 kHz)
Power Supply Current vs.
Temperature
PSRR vs. Frequency
PSRR(+)
=
–20
LOG
V

OUVTDD(0)
,
VDD = +15 V ؎1 VP, VSS = 0 V
PSRR(–) = –20 LOG VOUVTSS(0) ,
VDD = +15 V, VSS = –4 V ؎1 VP
REV. C
–5–

5 Page





DAC8426 arduino
DAC8426
MICROPROCESSOR INTERFACING
The DAC8426 easily interfaces to most 8- and 16-bit wide data-
bus systems. Serial and 4-bit busses can also be accommodated
with additional latches and control circuitry. Interfacing can be
accomplished with databus transfers running with 50 ns write
pulse widths.
Examples of various microprocessor interface circuits are pro-
vided in Figures 8 through 12. These figures have omitted cir-
cuitry not essential to the bus interface. The design process
should include review of the DAC8426 timing diagram with the
µP system timing diagram.
Figure 10. DAC8426 to 6809 Interface (Simplified circuit,
only lines of interest are shown.)
Figure 8. DAC8426 to 8085A Interface (Simplified circuit,
only lines of interest are shown.)
Figure 11. DAC8426 to 6502 Interface (Simplified circuit,
only lines of interest are shown.)
Figure 9. DAC8426 to Z-80 Interface (Simplified circuit,
only lines of interest are shown.)
Figure 12. DAC8426 to 68000 Interface (Simplified circuit,
only lines of interest are shown.)
REV. C
–11–

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