DAC0808
8-Bit D/A Converter
General Description
The DAC0808 is an 8-bit monolithic digital-to-analog con-
verter (DAC) featuring a full scale output current settling time
of 150 ns while dissipating only 33 mW with
5V supplies.
No reference current (I
REF
) trimming is required for most
applications since the full scale output current is typically
1
LSB of 255 I
REF
/256. Relative accuracies of better than
0.19% assure 8-bit monotonicity and linearity while zero
level output current of less than 4 A provides 8-bit zero
accuracy for I
REF
2 mA. The power supply currents of the
DAC0808 is independent of bit codes, and exhibits essen-
tially constant device characteristics over the entire supply
voltage range.
The DAC0808 will interface directly with popular TTL, DTL or
CMOS logic levels, and is a direct replacement for the
MC1508/MC1408. For higher speed applications, see
DAC0800 data sheet.
Features
n
Relative accuracy:
0.19% error maximum
n
Full scale current match:
1 LSB typ
n
Fast settling time: 150 ns typ
n
Noninverting digital inputs are TTL and CMOS
compatible
n
High speed multiplying input slew rate: 8 mA/s
n
Power supply voltage range:
4.5V to
18V
n
Low power consumption: 33 mW
@
5V
Block and Connection Diagrams
DS005687-1
Dual-In-Line Package
DS005687-2
Top View
Order Number DAC0808
See NS Package M16A or N16A
May 1999
DAC0808
8-Bit
D/A
Converter
2001 National Semiconductor Corporation
DS005687
www.national.com
Block and Connection Diagrams
(Continued)
Ordering Information
ACCURACY
OPERATING
TEMPERATURE RANGE
N PACKAGE (N16A)
(Note 1)
SO PACKAGE
(M16A)
8-bit
0C
T
A
+75C
DAC0808LCN
MC1408P8
DAC0808LCM
Note 1: Devices may be ordered by using either order number.
Small-Outline Package
DS005687-13
DAC0808
www.national.com
2
Absolute Maximum Ratings
(Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Supply Voltage
V
CC
+18 V
DC
V
EE
-18 V
DC
Digital Input Voltage, V5V12
-10 V
DC
to +18 V
DC
Applied Output Voltage, V
O
-11 V
DC
to +18 V
DC
Reference Current, I
14
5 mA
Reference Amplifier Inputs, V14, V15
V
CC
, V
EE
Power Dissipation (Note 4)
1000 mW
ESD Susceptibility (Note 5)
TBD
Storage Temperature Range
-65C to +150C
Lead Temp. (Soldering, 10 seconds)
Dual-In-Line Package (Plastic)
260C
Dual-In-Line Package (Ceramic)
300C
Surface Mount Package
Vapor Phase (60 seconds)
215C
Infrared (15 seconds)
220C
Operating Ratings
Temperature Range
T
MIN
T
A
T
MAX
DAC0808
0
T
A
+75C
Electrical Characteristics
(V
CC
= 5V, V
EE
= -15 V
DC
, V
REF
/R14 = 2 mA, and all digital inputs at high logic level unless otherwise noted.)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
E
r
Relative Accuracy (Error Relative
(
Figure 4)
%
to Full Scale I
O
)
DAC0808LC (LM1408-8)
0.19
%
Settling Time to Within
1
/
2
LSB
T
A
=25C (Note 7),
150
ns
(Includes t
PLH
)
(
Figure 5)
t
PLH
, t
PHL
Propagation Delay Time
T
A
= 25C, (
Figure 5)
30
100
ns
TCI
O
Output Full Scale Current Drift
20
ppm/C
MSB
Digital Input Logic Levels
(
Figure 3)
V
IH
High Level, Logic "1"
2
V
DC
V
IL
Low Level, Logic "0"
0.8
V
DC
MSB
Digital Input Current
(
Figure 3)
High Level
V
IH
= 5V
0
0.040
mA
Low Level
V
IL
= 0.8V
-0.003
-0.8
mA
I
15
Reference Input Bias Current
(
Figure 3)
-1
-3
A
Output Current Range
(
Figure 3)
V
EE
= -5V
0
2.0
2.1
mA
V
EE
= -15V, T
A
= 25C
0
2.0
4.2
mA
I
O
Output Current
V
REF
= 2.000V,
R14 = 1000
,
(
Figure 3)
1.9
1.99
2.1
mA
Output Current, All Bits Low
(
Figure 3)
0
4
A
Output Voltage Compliance (Note 3)
E
r
0.19%, T
A
= 25C
V
EE
=-5V, I
REF
=1 mA
-0.55, +0.4
V
DC
V
EE
Below -10V
-5.0, +0.4
V
DC
SRI
REF
Reference Current Slew Rate
(
Figure 6)
4
8
mA/s
Output Current Power Supply
-5V
V
EE
-16.5V
0.05
2.7
A/V
Sensitivity
Power Supply Current (All Bits
(
Figure 3)
Low)
I
CC
2.3
22
mA
I
EE
-4.3
-13
mA
Power Supply Voltage Range
T
A
= 25C, (
Figure 3)
V
CC
4.5
5.0
5.5
V
DC
V
EE
-4.5
-15
-16.5
V
DC
Power Dissipation
DAC0808
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3
Electrical Characteristics
(Continued)
(V
CC
= 5V, V
EE
= -15 V
DC
, V
REF
/R14 = 2 mA, and all digital inputs at high logic level unless otherwise noted.)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
All Bits Low
V
CC
= 5V, V
EE
= -5V
33
170
mW
V
CC
= 5V, V
EE
= -15V
106
305
mW
All Bits High
V
CC
= 15V, V
EE
= -5V
90
mW
V
CC
= 15V, V
EE
= -15V
160
mW
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its specified operating conditions.
Note 3: Range control is not required.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
JA
, and the ambient temperature, T
A
. The maximum
allowable power dissipation at any temperature is P
D
= (T
JMAX
- T
A
)/
JA
or the number given in the Absolute Maixmum Ratings, whichever is lower. For this device,
T
JMAX
= 125C, and the typical junction-to-ambient thermal resistance of the dual-in-line J package when the board mounted is 100C/W. For the dual-in-line N
package, this number increases to 175C/W and for the small outline M package this number is 100C/W.
Note 5: Human body model, 100 pF discharged through a 1.5 k
resistor.
Note 6: All current switches are tested to guarantee at least 50% of rated current.
Note 7: All bits switched.
Note 8: Pin-out numbers for the DAL080X represent the dual-in-line package. The small outline package pinout differs from the dual-in-line package.
Typical Application
Typical Performance Characteristics
V
CC
= 5V, V
EE
= -15V, T
A
= 25C, unless otherwise noted
DS005687-3
DS005687-23
FIGURE 1. +10V Output Digital to Analog Converter (Note 8)
Logic Input Current vs
Input Voltage
DS005687-14
Bit Transfer Characteristics
DS005687-15
Logic Threshold Voltage vs
Temperature
DS005687-16
DAC0808
www.national.com
4
Typical Performance Characteristics
V
CC
= 5V, V
EE
= -15V, T
A
= 25C, unless otherwise
noted (Continued)
Unless otherwise specified: R14 = R15 = 1 k
, C = 15 pF, pin 16 to V
EE
; R
L
= 50
, pin 4 to ground.
Curve A: Large Signal Bandwidth Method of
Figure 7, V
REF
= 2 Vp-p offset 1V above ground.
Curve B: Small Signal Bandwidth Method of
Figure 7, R
L
= 250
, V
REF
= 50 mVp-p offset 200 mV above ground.
Curve C: Large and Small Signal Bandwidth Method of
Figure 9 (no op amp, R
L
= 50
), R
S
= 50
, V
REF
= 2V, V
S
= 100 mVp-p
centered at 0V.
Output Current vs Output
Voltage (Output Voltage
Compliance)
DS005687-17
Output Voltage Compliance
vs Temperature
DS005687-18
Typical Power Supply
Current vs Temperature
DS005687-19
Typical Power Supply
Current vs V
EE
DS005687-20
Typical Power Supply
Current vs V
CC
DS005687-21
Reference Input
Frequency Response
DS005687-22
DAC0808
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5
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