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부품번호 DAC8426BR 기능
기능 Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference
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DAC8426BR 데이터시트, 핀배열, 회로
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




DAC8426BR pdf, 반도체, 판매, 대치품
DAC8426
DICE CHARACTERISTICS
1. VOUT B
2. VOUT A
3. VSS
4. VREF OUT
5. AGND
6. DGND
7. DB7 (MSB)
8. DB6
9. DB5
10. DB4
11. DB3
12. DB2
13. DB1
14. DB0 (LSB)
15. WR
16. A1
17. A0
18. VDD
19. VOUT D
20. VOUT C
DIE SIZE 0.129 × 0.152 inch, 19,608 sq. mils
(3.28 × 3.86 mm, 12.65 sq. mm)
WAFER TEST LIMITS at VDD = +15 V ؎ 5%; VSS = AGND = DGND = 0 V; unless otherwise specified. TA = +25؇C. All specifications
apply for DACs A, B, C, and D.
Parameter
Symbol
Conditions
DAC8426GBC
Limits
Units
Total Unadjusted Error
Relative Accuracy
Differential Nonlinearity
Full-Scale Error
Zero Code Error
DAC Output Current
Reference Output Voltage
Load Regulation
Line Regulation
Reference Output Current
Logic Inputs High
Logic Inputs Low
Logic Input Current
Positive Supply Current
Negative Supply Current
TUE
INL
DNL
GFSE
VZSE
IOUTSOURCE
VREFOUT
LDREG
LNREG
IREFOUT
VINH
VINL
IIN
IDD
ISS
Digital In = All Ones
No Load
IL = 5 mA
VDD = ± 10 V
VREFOUT < 40 mV
VIN = 0 V or VDD
VIN = VINL or VINH
VIN = VINL or VINH’ VSS = –5 V
±2
±1
±1
±1
± 20
10
10.04
0.1
0.04
5
2.4
0.8
±1
14
10
LSB max
LSB max
LSB max
LSB max
mV max
mA min
V max
%/mA max
%/V max
mA min
V min
V max
µA max
mA max
mA max
NOTE
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed
for standard product dice. Consult factory to negotiate specifications based on dice lot qualifications through sample lot assembly and testing.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the DAC8426 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
–4– REV. C

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DAC8426BR 전자부품, 판매, 대치품
DAC8426
PARAMETER DEFINITIONS
TOTAL UNADJUSTED ERROR (TUE)
This specification includes the Full-Scale-Error, Relative Accu-
racy Zero-Code-Error and the internal reference voltage. The
ideal Full-Scale output voltage is 10 V minus 1 LSB which
equals 9.961 volts. Each LSB equals 10 V × (1/256) = 0.039 volts.
DIGITAL CROSSTALK
Digital crosstalk is the signal coupled to the output of a DAC
due to a changing digital input from adjacent DACs being up-
dated. It is specified in nano-Volt-seconds (nVs).
CIRCUIT DESCRIPTION
The DAC8426 is a complete quad 8-bit D/A converter. It con-
tains an internal bandgap reference, four voltage switched R-2R
ladder DACs, four DAC latches, four output buffer amplifiers,
and an address decoder. All four DACs share the internal ten
volt reference and analog ground(AGND). Figure 1 provides an
equivalent DAC plus buffer schematic.
Table I. DAC Control Logic Truth Table
Logic Control
WR A1
A0
DAC8426
Operation
H X X No Operation
Device Not Selected
L L L DAC A Transparent
g L L DAC A Latched
L L H DAC B Transparent
g L H DAC B Latched
LH
L
DAC C Transparent
gH L
DAC C Latched
L H H DAC D Transparent
g H H DAC D Latched
L = Low State, H = High State, X = Don’t Care
Figure 1. Simplified Circuit Configuration for One DAC.
(Switches Are Shown for All “1s” on the Digital Inputs.)
The eleven digital inputs are compatible with both TTL and 5 V
(or higher) CMOS logic. Table I shows the DAC control logic
truth table for WR, A1, and A0 operation. When WR is active
low the input latch of the selected DAC is transparent, and the
DAC’s output responds to the data present on the eight digital
data inputs (DBx). The data (DBx) is latched into the ad-
dressed DAC’s latch on the positive edge of the WR control sig-
nal. The important timing requirements are shown in the Write
Cycle Timing Diagram, Figure 2.
INTERNAL 10 VOLT REFERENCE
The internal 10 V bandgap reference of the DAC8426 is trimm-
ed to the output voltage and temperature drift specifications.
This internal reference is connected to the reference inputs of
the four internal 8-bit D/A converters. The output terminal of
the internal 10 V reference is available on pin 4. The 10 V out-
put of the reference is produced with respect to the AGND pin.
This reference output can be used to supply as much as 5 mA of
additional current to external devices. Care has been taken in
Figure 2. Write Cycle Timing Diagram
the design of the internal DAC switching to minimize transients
on the reference voltage terminal (VREFOUT). Other devices
connected to this reference terminal should have well behaved
input loading characteristics. D/A converters such as the PMI
PM7226A have been designed to minimize reference input tran-
sient currents and can be directly connected to the DAC8426
10 V reference. Devices exhibiting large current transients due
to internal switching should be buffered with an op amp to
maintain good overall system noise performance. A 10 µF refer-
ence output bypass capacitor is required.
BUFFER AMPLIFIER SECTION
The four internal unity-gain voltage buffers provide low output
impedance capable of sourcing 5 mA or sinking 350 µA. Typical
output slew rates of ±4 V/µs are achieved with 10 V full-scale out-
put changes and RL = 2 k. Figure 3 photographs show large sig-
nal and settling time response. Capacitive loads to 3300 pF
maximum, and resistive loads to 2 kminimum can be applied.
REV. C
–7–

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부품번호상세설명 및 기능제조사
DAC8426BR

Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference

Analog Devices
Analog Devices

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