AD7841_15 Datasheet, PDF (1/13 Pages) Analog Devices – Octal 14-Bit, Parallel Input, Voltage-Output DAC

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Octal 14-Bit, Parallel Input,
Voltage-Output DAC
AD7841
FEATURES
Eight 14-Bit DACs in One Package
Voltage Outputs
Offset Adjust for Each DAC Pair
Reference Range of ؎5 V
Maximum Output Voltage Range of ؎10 V
؎15 V ؎ 10% Operation
Clear Function to User-Defined Voltage
44-Lead MQFP Package
APPLICATIONS
Automatic Test Equipment
Process Control
General Purpose Instrumentation
GENERAL DESCRIPTION
The AD7841 contains eight 14-bit DACs on one monolithic
chip. It has output voltages with a full-scale range of ± 10 V
from reference voltages of ± 5 V.
The AD7841 accepts 14-bit parallel loaded data from the exter-
nal bus into one of the input registers under the control of the
WR, CS, and DAC channel address pins, A0–A2.
The DAC outputs are updated on reception of new data into
the DAC registers. All the outputs may be updated simulta-
neously by taking the LDAC input low.
Each DAC output is buffered with a gain-of-two amplifier into
which an external DAC offset voltage can be inserted via the
DUTGNDx pins.
The AD7841 is available in a 44-lead MQFP package.
V_CC
V_SS V_DD
FUNCTIONAL BLOCK DIAGRAM
V_REF(+) V_REF(–)
AB
AB
DUTGND
CD
DUTGND
AB
DB13
DB0
WR
CS
A0
A1
A2
LDAC
AD7841
14 _INPUT 14
REG
A
DAC ¹⁴
REG
A
DAC A
14 _INPUT 14
REG
B
DAC ¹⁴
REG
B
DAC B
14 _INPUT 14
REG
C
DAC ¹⁴
REG
C
DAC C
14 _INPUT 14
REG
D
DAC ¹⁴
REG
D
DAC D
14 _INPUT 14
REG
E
DAC ¹⁴
REG
E
DAC E
14 _INPUT 14
REG
F
DAC ¹⁴
REG
F
DAC F
14 _INPUT 14
REG
G
DAC ¹⁴
REG
G
DAC G
14 _INPUT 14
REG
H
DAC ¹⁴
REG
H
DAC H
R
R
R
R
R
R
R
R
V_OUTA
V_OUTB
V_OUTC
V_OUTD
V_OUTE
R
R
V_OUTF
R
R
V_OUTG
R
R
V_OUTH
R
R
GND
REV. B
V_REF(+) V_REF(–)
GH
GH
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V_REF(+) V_REF(–)
CDEF CDEF
CLR ^{DUTGND DUTGND}
EF
GH
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