19-2953; Rev 0; 7/03
Octal, 14-Bit Voltage-Output DAC
with Parallel Interface
General Description
The MX7841 contains eight 14-bit, voltage-output digi-
tal-to-analog converters (DACs). On-chip precision out-
put amplifiers provide the voltage outputs. The device
operates from ±15V supplies. Its bipolar output voltage
swing ranges from (V
SS
+ 2.5V) to (V
DD
- 2.5V) and is
achieved with no external components. The MX7841
has three pairs of differential reference inputs; two of
these pairs are connected to two DACs each, and a
third pair is connected to four DACs. The references
are independently controlled, providing different full-
scale output voltages to the respective DACs.
The MX7841 features double-buffered interface logic
with a 14-bit parallel data bus. Each DAC has an input
latch and a DAC latch. Data in the DAC latch sets the
output voltage. The eight input latches are addressed
with three address lines. Data is loaded to the input
latch with a single write instruction. An asynchronous
load input (LDAC) transfers data from the input latch to
the DAC latch. The
LDAC
input controls all DACs;
therefore, all DACs can be updated simultaneously by
asserting
LDAC.
An asynchronous
CLR
input sets the output of all eight
DACs to the respective DUTGND input of the op amp.
Note that
CLR
is a CMOS input, which is powered by
V
DD
. All other logic inputs are TTL/CMOS compatible.
The MX7841 is pin-for-pin compatible with AD7841.
o
Eight DACs in a Single Package
o
Buffered Voltage Outputs
o
Unipolar or Bipolar Voltage Swing of (V
SS
+ 2.5V)
to (V
DD
- 2.5V)
o
31µs Output Settling Time
o
Low Power Consumption: 8mA (typ)
o
Small 44-Pin MQFP Package
o
Double-Buffered Digital Inputs
o
Asynchronous Load Updates All DACs
Simultaneously
o
Asynchronous
CLR
Forces All DACs to
DUTGND_ _ Potential
Features
o
Full 14-Bit Performance Without Adjustments
MX7841
Ordering Information
PART
MX7841BS
MX7841AS
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
44 MQFP
44 MQFP
INL
(LSB)
±2
±4
Applications
Automatic Test Equipment (ATE)
Industrial Process Controls
Arbitrary Function Generators
Avionics Equipment
Minimum Component Count Analog Systems
Digital Offset/Gain Adjustment
SONET Applications
DUTGNDAB
OUTA
REFAB-
REFAB+
V
DD
V
SS
LDAC
A2
A1
A0
CS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Configuration
TOP VIEW
OUTB
OUTC
44
43
42
41
40
39
38
37
36
35
34
DUTGNDCD
OUTD
REFCDEF-
REFCDEF+
V
DD
OUTE
DUTGNDEF
OUTF
OUTG
33
32
31
30
29
28
27
26
25
24
23
17
18
19
20
21
22
DUTGNDGH
OUTH
REFGH-
REFGH+
CLR
DB13
DB12
DB11
DB10
DB9
DB8
MX7841
Functional Diagram appears at end of data sheet.
WR
V
CC
GND
DB0
DB1
DB2
DB3
MQFP
________________________________________________________________
Maxim Integrated Products
DB4
DB5
DB6
DB7
1
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Octal, 14-Bit Voltage-Output DAC
with Parallel Interface
MX7841
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................-0.3V to +17V
V
SS
to GND ........................................................... -17V to +0.3V
V
CC
to GND ............................................................ -0.3V to +6V
A_, DB_,
WR, CS, LDAC, CLR
to GND .....+0.3V to (V
CC
+ 0.3V)
REF_ _ _ _+, REF_ _ _ _-,
DUTGND_ _ .................................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
OUT_ ..........................................................................V
DD
to V
SS
Maximum Current into REF_ _ _ _ _, DUTGND_ _ ...........±10mA
Maximum Current into Any Signal Pin ..............................±50mA
OUT_ Short-Circuit Duration to V
DD
, V
SS
, and GND ................1s
Continuous Power Dissipation (T
A
= +70°C)
44-Pin MQFP (derate 11.1mW/°C above +70°C).........870mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= +15V ±10%, V
SS
= -15V ±10%, V
CC
= +5V ±5%, V
GND
= V
DUTGND_ _
= 0, V
REF
_ _ _ _+ = +5V, V
REF
_ _ _ _- = -5V, R
L
= 5kΩ,
C
L
= 50pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Resolution
Relative Accuracy
Differential Nonlinearity
Zero-Scale Error
Full-Scale Error
Gain Error
Gain Temperature Coefficient
DC Crosstalk
REFERENCE INPUTS
Input Resistance
Input Current
REF_ _ _ _+ Input Range
REF_ _ _ _- Input Range
(REF_ _ _ _+) - (REF_ _ _ _-)
Range
ANALOG OUTPUTS
Output Voltage Swing
Resistive Load to GND
Capacitive Load to GND
DC Output Impedance
(Note 1)
5
50
0.5
(V
SS
+ 2.5) to
(V
DD
- 2.5)
V
kΩ
pF
Ω
0
-5
2
100
±1
5
0
10
MΩ
µA
V
V
V
(Note 1)
(Note 1)
SYMBOL
N
INL
DNL
MX7841BS
MX7841AS
Guaranteed monotonic
±2
±2
±2
0.5
75
10
120
CONDITIONS
MIN
14
±2
±4
±1
±8
±8
TYP
MAX
UNITS
Bits
LSB
LSB
LSB
LSB
LSB
ppm
FSR/°C
µV
STATIC PERFORMANCE (ANALOG SECTION)
2
_______________________________________________________________________________________
Octal, 14-Bit Voltage-Output DAC
with Parallel Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +15V ±10%, V
SS
= -15V ±10%, V
CC
= +5V ±5%, V
GND
= V
DUTGND_ _
= 0, V
REF
_ _ _ _+ = +5V, V
REF
_ _ _ _- = -5V, R
L
= 5kΩ,
C
L
= 50pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Impedance per DAC
Maximum Input Current per DAC
Input Range
DIGITAL INPUTS
Input Voltage High
Input Voltage Low
Input Capacitance
Input Current
POWER SUPPLIES
V
DD
Analog Power-Supply
Range
V
SS
Analog Power-Supply
Range
V
CC
Digital Power Supply
Positive Supply Current
Negative Supply Current
Digital Supply Current
PSRR,
∆V
OUT
/
∆V
DD
PSRR,
∆V
OUT
/
∆V
SS
V
DD
V
SS
V
CC
I
DD
I
SS
I
CC
R
L
=
∞
R
L
=
∞
(Note 2)
V
DD
= +15V ±5%
V
SS
= -15V ±5%
90
90
13.5
-16.75
4.75
8
8
16.5
-13.5
5.25
10
10
0.5
V
V
V
mA
mA
mA
dB
dB
V
IH
V
IL
C
IN
I
IN
(Note 1)
Digital inputs = 0V or V
CC
±1
2.4
0.8
10
±10
V
V
pF
µA
-2
SYMBOL
CONDITIONS
MIN
TYP
60
±300
+2
MAX
UNITS
kΩ
µA
V
DUTGND_ _ CHARACTERISTICS
MX7841
INTERFACE TIMING CHARACTERISTICS
(V
DD
= +15V ±10%, V
SS
= -15V ±10%, V
CC
= +5V ±5%, V
GND
= V
DUTGND_ _
= 0, V
REF
_ _ _ _+ = +5V, V
REF
_ _ _ _- = -5V, Figure 2a,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
CS
Pulse Width Low
WR
Pulse Width Low
LDAC
Pulse Width Low
CS
Low to
WR
Low
CS
High to
WR
High
Data Valid to
WR
Setup
Data Valid to
WR
Hold
Address Valid to
WR
Setup
Address Valid to
WR
Hold
CLR
Pulse-Activation Time
SYMBOL
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
(Figure 2b)
CONDITIONS
MIN
50
50
50
0
0
20
0
15
0
300
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
_______________________________________________________________________________________
3
Octal, 14-Bit Voltage-Output DAC
with Parallel Interface
MX7841
DYNAMIC CHARACTERISTICS
(V
DD
= +15V ±10%, V
SS
= -15V ±10%, V
CC
= +5V ±5%, V
GND
= V
DUTGND_ _
= 0, V
REF
_ _ _ _+ = +5V, V
REF
_ _ _ _- = -5V, R
L
= 5kΩ,
C
L
= 50pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Output Settling Time
Output Slew Rate
Digital Feedthrough
Digital Crosstalk
Digital-to-Analog Glitch Impulse
DAC-to-DAC Crosstalk
Channel-to-Channel Isolation
Output Noise Spectral Density
Note 1:
Note 2:
Note 3:
Note 4:
V
REF+
= V
REF-
= 0
(Note 3)
(Note 4)
SYMBOL
CONDITIONS
To ±0.5 LSB of full scale
MIN
TYP
31
0.7
0.1
0.2
230
40
99
200
MAX
UNITS
µs
V/µs
nV-s
nV-s
nV-s
nV-s
dB
nV/√Hz
Guaranteed by design. Not production tested.
All digital inputs (DB_, A_,
WR, CS, LDAC,
and
CLR)
at GND or V
CC
potential.
All digital inputs (DB_, A_,
WR, CS, LDAC,
and
CLR)
at +0.8V or +2.4V.
All digital inputs (DB0 to DB13) transition from GND to V
CC
with
WR
= V
CC
Typical Operating Characteristics
(V
DD
= +15V ±10%, V
SS
= -15V ±10%, V
CC
= +5V ±5%, V
GND
= V
DUTGND_ _
= 0, V
REF
_ _ _ _+ = +5V, V
REF
_ _ _ _- = -5V, T
A
=
+25°C, unless otherwise noted.)
INL vs. CODE
MX7841 toc01
DNL vs. CODE
0.400
0.300
0.200
DNL (LSB)
0.100
0
ERROR (LSB)
0.1
0
-0.1
MX7841 toc02
INL AND DNL ERROR
vs. TEMPERATURE
0.3
0.2
INL
MX7841 toc03
0.500
0.400
0.300
0.200
INL (LSB)
0.100
0
0.500
0.4
-0.100
-0.200
-0.300
-0.400
-0.500
0 2048 4096 6144 8192 10240 12288 14336 16384
CODE
-0.100
-0.200
-0.300
-0.400
-0.500
0 2048 4096 6144 8192 10240 12288 14336 16384
CODE
DNL
-0.2
-0.3
-0.4
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Octal, 14-Bit Voltage-Output DAC
with Parallel Interface
Typical Operating Characteristics (continued)
(V
DD
= +15V ±10%, V
SS
= -15V ±10%, V
CC
= +5V ±5%, V
GND
= V
DUTGND_ _
= 0, V
REF
_ _ _ _+ = +5V, V
REF
_ _ _ _- = -5V, T
A
=
+25°C, unless otherwise noted.)
ZERO-SCALE AND FULL-SCALE ERROR
vs. TEMPERATURE
MX7841 toc04
MX7841
I
DD
AND I
SS
vs. TEMPERATURE
MX7841 toc05
DIGITAL SUPPLY CURRENT
vs. TEMPERATURE
DIGITAL SUPPLY CURRENT, I
CC
(µA)
24.5
24.0
23.5
23.0
22.5
22.0
21.5
21.0
20.5
MX7841 toc06
1.2
1.0
0.8
0.6
ERROR (LSB)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
ZERO SCALE
FULL SCALE
8.0
7.5
7.0
6.5
6.0
5.5
5.0
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (°C)
IDD
25.0
I
DD
, I
SS
(mA)
ISS
20.0
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (°C)
REFERENCE INPUT FREQUENCY RESPONSE
MX7841 toc07
SETTLING TIME
vs. CAPACITIVE LOAD
90
80
SETTLING TIME (µs)
70
60
50
40
30
20
10
0
OUT_
5V/div
MX7841 toc08
LARGE-SIGNAL STEP RESPONSE
MX7841 toc09
5
0
-5
AMPLITUDE (dB)
-10
-15
-20
-25
-30
-35
-40
1k
10k
REF_ _ _ _ _ = 200mVp-p
100
LDAC
5V/div
100k
FREQUENCY (Hz)
1M
10M
10
100
1000
10,000
100,000
10µs/div
CAPACITIVE LOAD (pF)
POSITIVE SETTLING TIME
MX7841 toc10
NEGATIVE SETTLING TIME
MX7841 toc11
NOISE VOLTAGE DENSITY
vs. FREQUENCY
MX7841 toc12
1000
NOISE VOLTAGE DENSITY (nV/√Hz)
100
10
LDAC
5V/div
LDAC
5V/div
OUT_
1mV/div
OUT_
1mV/div
10µs/div
10µs/div
100
1k
10k
FREQUENCY (Hz)
_______________________________________________________________________________________
5
NXP MCU
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