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PDF ( 数据手册 , 数据表 ) DAC8426

零件编号 DAC8426
描述 Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference
制造商 Analog Devices
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DAC8426 数据手册, 描述, 功能
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







DAC8426 pdf, 数据表
DAC8426
a) Large Signal
b) Settling Time Response (Negative Transition)
Test Conditions, All Photos:
VDD = +15 V
CREFOUT = 10 F
RL = 2 k
Digital Input Sequence 0, 255, 0
c) Settling Time Response (Positive Transition)
Figure 3. Dynamic Response
The outputs can withstand an indefinite short-circuit to AGND
to typically 50 mA. The output may also be shorted to any volt-
age between VDD and VSS; however, care must be taken to not
exceed the device maximum power dissipation.
The amplifier’s emitter follower output stage consists of an in-
trinsic NPN bipolar transistor with a 400 µA NMOS pull-down
current-source load connected to VSS. This circuit configuration
shown in Figure 4 enables the output amplifier to develop out-
put voltages very close to AGND. Only the negative supply of the
four output buffer amplifiers are connected to VSS. Operating
the DAC8426 from dual supplies (VDD = +15 V and VSS = –5 V)
improves negative going output settling time near zero volts.
When operating single supply (VDD = +15 V and VSS = 0 V) the
output sink current decreases as the output approaches zero
voltage. Within 200 mV of AGND (single-supply operation) the
internal sinking capability appears resistive at a value of approxi-
mately 1200 . The buffer amplifier output current and voltage
characteristics are plotted in Figure 5.
–8– REV. C














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