REV. A
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.
a
8-Bit, High Speed, Multiplying D/A Converter
(Universal Digital Logic Interface)
DAC08
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
GENERAL DESCRIPTION
The DAC08 series of 8-bit monolithic digital-to-analog convert-
ers provide very high-speed performance coupled with low cost
and outstanding applications flexibility.
Advanced circuit design achieves 85 ns settling times with very
low “glitch” energy and at low power consumption. Monotonic
multiplying performance is attained over a wide 20 to 1 refer-
ence current range. Matching to within 1 LSB between refer-
FEATURES
Fast Settling Output Current: 85 ns
Full-Scale Current Prematched to 61 LSB
Direct Interface to TTL, CMOS, ECL, HTL, PMOS
Nonlinearity to 0.1% Maximum Over
Temperature Range
High Output Impedance and Compliance:
–10 V to +18 V
Complementary Current Outputs
Wide Range Multiplying Capability: 1 MHz Bandwidth
Low FS Current Drift: 610 ppm/8C
Wide Power Supply Range: 64.5 V to 618 V
Low Power Consumption: 33 mW @ 65 V
Low Cost
Available in Die Form
ence and full-scale currents eliminates the need for full-scale
trimming in most applications. Direct interface to all popular
logic families with full noise immunity is provided by the high
swing, adjustable threshold logic input.
High voltage compliance complementary current outputs are
provided, increasing versatility and enabling differential opera-
tion to effectively double the peak-to-peak output swing. In
many applications, the outputs can be directly converted to volt-
age without the need for an external op amp.
All DAC08 series models guarantee full 8-bit monotonicity, and
nonlinearities as tight as ±0.1% over the entire operating tem-
perature range are available. Device performance is essentially
unchanged over the ±4.5 V to ±18 V power supply range, with
33 mW power consumption attainable at ±5 V supplies.
The compact size and low power consumption make the
DAC08 attractive for portable and military/aerospace appli-
cations; devices processed to MIL-STD-883, Level B are
available.
DAC08 applications include 8-bit, 1 µs A/D converters, servo
motor and pen drivers, waveform generators, audio encoders
and attenuators, analog meter drivers, programmable power
supplies, CRT display drivers, high-speed modems and other
applications where low cost, high speed and complete input/out-
put versatility are required.
FUNCTIONAL BLOCK DIAGRAM
ELECTRICAL CHARACTERISTICS
DAC08A/H DAC08E DAC08C
Parameter Symbol Conditions Min Typ Max Min Typ Max Min Typ Max Units
Resolution 8 8 8 Bits
Monotonicity 8 8 8 Bits
Nonlinearity NL ±0.1 ±0.19 ±0.39 % FS
Settling Time t
S
To ±1/2 LSB, 85 135 85 150 85 150 ns
All Bits Switched ON
or OFF, T
A
= 25°C
1
Propagation Delay
Each Bit t
PLH
T
A
= 25°C
1
35 60 35 60 35 60 ns
All Bits Switched t
PHL
35 60 35 60 35 60 ns
Full-Scale Tempco
1
TCI
FS
±10 ±50 ±10 ±80 ±10 ±80 ppm/°C
DAC08E ±50
Output Voltage
Compliance V
OC
Full-Scale Current
(True Compliance) Change <1/2 LSB, –10 +18 –10 +18 –10 +18 V
R
OUT
> 20 MΩ typ
Full Range Current I
FR4
V
REF
= 10.000 V 1.984 1.992 2.000 1.94 1.99 2.04 1.94 1.99 2.04 mA
R14, R15 = 5.000 kΩ
T
A
= +25°C
Full Range Symmetry I
FRS
I
FR4
– I
FR2
±0.5 ±4±1±8±2±16 µA
Zero-Scale Current I
ZS
0.1 1 0.2 2 0.2 4 µA
Output Current Range I
OR1
R14, R15 = 5.000 kΩ2.1 2.1 2.1 mA
I
OR2
V
REF
= +15.0 V,
V– = –10 V
V
REF
= +25.0 V, 4.2 4.2 4.2 mA
V– = –12 V
Output Current Noise I
REF
= 2 mA 25 25 25 nA
Logic Input Levels
Logic “0” V
IL
V
LC
= 0 V 0.8 0.8 0.8 V
Logic Input “1” V
IL
22 2 V
Logic Input Current V
LC
= 0 V
Logic “0” I
IL
V
IN
= –10 V to +0.8 V –2 –10 –2 –10 –2 –10 µA
Logic Input “1” I
IH
V
IN
= 2.0 V to 18 V 0.002 10 0.002 10 0.002 10 µA
Logic Input Swing V
IS
V– = –15 V –10 +18 –10 +18 –10 +18 V
Logic Threshold Range V
THR
V
S
= ±15 V
1
–10 +13.5 –10 +13.5 –10 +13.5 V
Reference Bias Current I
15
–1 –3 –1 –3 –1 –3 µA
Reference Input dI/dt R
EQ
= 200 Ω4 8 4 8 4 8 mA/µs
Slew Rate R
L
= 100 Ω
C
C
= 0 pF See Fast Pulsed Ref. Info Following.
1
Power Supply Sensitivity PSSI
FS+
V+ = 4.5 V to 18 V ±0.0003 ±0.01 ±0.0003 ±0.01 ±0.0003 ±0.01 %∆I
O
/%∆V+
PSSI
FS–
V– = –4.5 V to –18 V ±0.002 ±0.01 ±0.002 ±0.01 ±0.002 ±0.01 %∆I
O
/%∆V–
I
REF
= 1.0 mA
Power Supply Current I+ V
S
= ±5 V, I
REF
= 1.0 mA 2.3 3.8 2.3 3.8 2.3 3.8 mA
I– –4.3 –5.8 –4.3 –5.8 –4.3 –5.8 mA
I+ V
S
= +5 V, –15 V, 2.4 3.8 2.4 3.8 2.4 3.8 mA
I– I
REF
= 2.0 mA –6.4 –7.8 –6.4 –7.8 –6.4 –7.8 mA
I+ V
S
= ±15 V, I
REF
= 2.5 3.8 2.5 3.8 2.5 3.8 mA
I– 2.0 mA –6.5 –7.8 –6.5 –7.8 –6.5 –7.8 mA
Power Dissipation P
d
±5 V, I
REF
= 1.0 mA 33 48 33 48 33 48 mW
+5 V, –15 V, I
REF
=
2.0 mA 108 136 103 136 108 136 mW
±15 V, I
REF
= 2.0 mA 135 174 135 174 135 174 mW
NOTES
1
Guaranteed by design.
Specifications subject to change without notice.
REV. A
–2–
(@ VS = 615 V, IREF = 2.0 mA, –558C ≤ TA ≤ +1258C for DAC08/08A, 08C ≤ TA ≤ +708C for
DAC08C, E & H unless otherwise noted. Output characteristics refer to both IOUT and
I
OUT
.)
DAC08–SPECIFICATIONS
PIN CONNECTIONS
16-Pin Dual-In-Line Package
(Q Suffix)
16-Lead SO
(S Suffix)
DAC08RC/883 20-Lead LCC
(RC Suffix)
NC = NO CONNECT
ABSOLUTE MAXIMUM RATINGS
1
Operating Temperature
DAC08AQ, Q . . . . . . . . . . . . . . . . . . . . . .–55°C to +125°C
DAC08HQ, EQ, CQ, HP, EP, CP, CS . . . . . 0°C to +70°C
Junction Temperature (T
J
) . . . . . . . . . . . . . .–65°C to +150°C
Storage Temperature Q Package . . . . . . . . . .–65°C to +150°C
Storage Temperature P Package . . . . . . . . . .–65°C to +125°C
Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . . 300°C
V+ Supply to V– Supply . . . . . . . . . . . . . . . . . . . . . . . . . .36 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . .V– to V– plus 36 V
V
LC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V– to V+
Analog Current Outputs (at V
S
– = 15 V) . . . . . . . . . . 4.25 mA
Reference Input (V
14
to V
15
) . . . . . . . . . . . . . . . . . . . V– to V+
Reference Input Differential Voltage
(V
14
to V
15
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Reference Input Current (I
14
) . . . . . . . . . . . . . . . . . . . 5.0 mA
Package Type u
JA2
u
JC
Units
16-Pin Hermetic DIP (Q) 100 16 °C/W
16-Pin Plastic DIP (P) 82 39 °C/W
20-Contact LCC (RC) 76 36 °C/W
16-Pin SO (S) 111 35 °C/W
NOTES
1
Absolute maximum ratings apply to both DICE and packaged parts, unless
otherwise noted.
2
θ
JA
is specified for worst case mounting conditions, i.e., θ
JA
is specified for device
in socket for cerdip, P-DIP, and LCC packages; θ
JA
is specified for device soldered
to printed circuit board for SO package.
ORDERING GUIDE
1
16-Pin Dual-In-Line Package Operating
Temperature
NL Hermetic Plastic LCC Range
0.1% DAC08AQ
2
MIL
DAC08HQ DAC08HP COM
0.19% DAC08Q
2
DAC08RC/883 MIL
DAC08EQ DAC08EP COM
0.39% DAC08CQ DAC08CP COM
DAC08CS
3
COM
NOTES
1
Burn-in is available on commercial and industrial temperature range parts in
cerdip, plastic DIP, and TO-can packages.
2
For devices processed in total compliance to MIL-STD-883, add /883 after
part number. Consult factory for 883 data sheet.
3
For availability and burn-in information on SO and PLCC packages, contact
your local sales office.
TYPICAL ELECTRICAL CHARACTERISTICS
All Grades
Parameter Symbol Conditions Typical Units
Reference Input Slew Rate dI/dt 8 mA/µs
Propagation Delay t
PLH
, t
PHL
T
A
= 25°C, Any Bit 35 ns
Settling Time t
S
To +1/2 LSB, All Bits
Switched ON or OFF, 85 ns
T
A
= 25°C
NOTES
For DAC08NT & GT 25 °C characteristics, see DAC08N & G characteristics respectively.
Specifications subject to change without notice
(@ VS = 615 V, and IREF = 2.0 mA, unless otherwise noted. Output
characteristics apply to both IOUT and
I
OUT
.)
DAC08
–3–
REV. A
DAC08
–4– REV. A
WAFER TEST LIMITS
DAC08NT DAC08N DAC08GT DAC08G DAC08GR
Parameter Symbol Conditions Limit Limit Limit Limit Limit Units
Resolution 8 8 8 8 8 Bits min
Monotonicity 8 8 8 8 8 Bits min
Nonlinearity NL ±0.1 ±0.1 ±0.19 ±0.19 ±0.39 % FS max
Output Voltage V
OC
Full-Scale Current +18 +18 +18 +18 +18 V max
Compliance Change < 1/2 LSB –10 –10 –10 –10 –10 V min
Full-Scale Current I
FS4
or V
REF
= 10.000 V 2.04 2.04 2.04 2.04 2.04 mA max
I
FS2
R
14
, R
15
= 5.000 kΩ1.94 1.94 1.94 1.94 1.94 mA min
Full-Scale Symmetry I
FSS
±8±8±8±8±16 µA max
Zero-Scale Current I
ZS
22444µA max
Output Current Range I
FS1
V– = –10 V,
V
REF
= +15 V 2.1 2.1 2.1 2.1 2.1 mA min
V– = –12 V,
I
FS2
V
REF
= +25 V 4.2 4.2 4.2 4.2 4.2 mA min
R
14
, R
15
= 5.000 kΩ
Logic Input “0” V
IL
0.8 0.8 0.8 0.8 0.8 V max
Logic Input “1” V
IH
2 2 2 2 2 V min
Logic Input Current V
LC
= 0 V
Logic “0” I
IL
V
IN
= –10 V to +0.8 V ±10 ±10 ±10 ±10 ±10 µA max
Logic “1” I
IH
V
IN
= 2.0 V to 18 V ±10 ±10 ±10 ±10 ±10 µA max
Logic Input Swing V
IS
V– = –15 V +18 +18 +18 +18 +18 V max
–10 –10 –10 –10 –10 V min
Reference Bias Current I
15
–3 –3 –3 –3 –3 µA max
Power Supply PSSI
FS+
V+ = 4.5 V to 18 V 0.01 0.01 0.01 0.01 0.01 % FS/% V max
Sensitivity PSSI
FS–
V– = –4.5 V to –18 V
I
REF
= 1.0 mA
Power Supply Current I+ V
S
= ±15 V 3.8 3.8 3.8 3.8 3.8 mA max
I
REF
≤ 2.0 mA –7.8 –7.8 –7.8 –7.8 –7.8 µA max
Power Dissipation P
d
V
S
= ±15 V 174 174 174 174 174 mW max
I
REF
≤ 2.0 mA
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 qualification through sample lot assembly and testing.
DICE CHARACTERISTICS
(+125°C Tested Dice Available)
(@ VS = 615 V, IREF = 2.0 mA, TA = 1258C for DAC08NT, DAC08GT devices; TA = 258C for DAC08N,
DAC08G and DAC08GR devices, unless otherwise noted. Output characteristics apply to both IOUT and
I
OUT
.)
DAC08
–5–
REV. A
Figure 4. True and Complimentary
Output Operation Figure 6. Full-Scale Settling Time
Figure 5. LSB Switching
Figure 3. Fast Pulsed Reference
Operation
Figure 1. Pulsed Reference Operation
Figure 2. Burn-in Circuit
DAC08
–6– REV. A
–Typical Performance Characteristics
Figure 7. Full-Scale Current
vs. Reference Current
Figure 10. Reference Amp
Common-Mode Range
Figure 13. Output Current vs.
Output Voltage (Output
Voltage Compliance)
Figure 8. LSB Propagation
Delay vs. I
FS
Figure 11. Logic Input Current vs.
Input Voltage
Figure 14. Output Voltage
Compliance vs. Temperature
Figure 9. Reference Input
Frequency Response
Figure 12. V
TH
–V
LC
vs. Temperature
Figure 15. Bit Transfer Characteristics
DAC08
–7–
REV. A
Figure 16. Power Supply
Current vs. V+ Figure 17. Power Supply
Current vs. V– Figure 18. Power Supply
Current vs. Temperature
BASIC CONNECTIONS
Figure 19. Accomodating Bipolar References Figure 20. Basic Positive Reference Operation
Figure 21. Basic Unipolar Negative Operation
DAC08
–8– REV. A
Figure 22. Basic Bipolar Output Operation
Figure 23. Recommended Full-Scale Adjustment Circuit Figure 24. Basic Negative Reference Operation
Figure 25. Offset Binary Operation
DAC08
–9–
REV. A
APPLICATIONS INFORMATION
REFERENCE AMPLIFIER SET-UP
The DAC08 is a multiplying D/A converter in which the output
current is the product of a digital number and the input refer-
ence current. The reference current may be fixed or may vary
from nearly zero to +4.0 mA. The full-scale output current is a
linear function of the reference current and is given by:
I
FR
=
255
256
× I
REF
, where I
REF
= I
14
.
In positive reference applications, an external positive reference
voltage forces current through R14 into the V
REF(+)
terminal
(pin 14) of the reference amplifier. Alternatively, a negative ref-
erence may be applied to V
REF(–)
at pin 15; reference current
flows from ground through R14 into V
REF(+)
as in the positive
reference case. This negative reference connection has the ad-
vantage of a very high impedance presented at pin 15. The volt-
age at pin 14 is equal to and tracks the voltage at pin 15 due to
the high gain of the internal reference amplifier. R15 (nominally
equal to R14) is used to cancel bias current errors; R15 may be
eliminated with only a minor increase in error.
Bipolar references may be accommodated by offsetting V
REF
or
pin 15. The negative common-mode range of the reference am-
plifier is given by: V
CM
– = V– plus (I
REF
× 1 kΩ) plus 2.5 V. The
positive common-mode range is V+ less 1.5 V.
When a dc reference is used, a reference bypass capacitor is rec-
ommended. A 5.0 V TTL logic supply is not recommended as a
reference. If a regulated power supply is used as a reference, R14
should be split into two resistors with the junction bypassed to
ground with a 0.1 µF capacitor.
For most applications the tight relationship between I
REF
and
I
FS
will eliminate the need for trimming I
REF
. If required,
full-scale trimming may be accomplished by adjusting the value
of R14, or by using a potentiometer for R14. An improved
method of full-scale trimming which eliminates potentiometer
T.C. effects is shown in the recommended full-scale adjustment
circuit.
Using lower values of reference current reduces negative power
supply current and increases reference amplifier negative common-
mode range. The recommended range for operation with a dc
reference current is +0.2 mA to +4.0 mA.
Figure 27. Negative Low Impedance
Output Operation
Figure 26. Positive Low Impedance
Output Operation
Figure 28. Interfacing With Various Logic Families
DAC08
–10– REV. A
REFERENCE AMPLIFIER COMPENSATION FOR
MULTIPLYING APPLICATIONS
AC reference applications will require the reference amplifier to
be compensated using a capacitor from pin 16 to V–. The value
of this capacitor depends on the impedance presented to pin 14:
for R14 values of 1.0, 2.5 and 5.0 kΩ, minimum values of C
C
are 15, 37, and 75 pF. Larger values of R14 require proportion-
ately increased values of C
C
for proper phase margin, such that
the ratio of C
C
(pF) to R14 (kΩ) = 15.
For fastest response to a pulse, low values of R14 enabling small
C
C
values should be used. If pin 14 is driven by a high imped-
ance such as a transistor current source, none of the above val-
ues will suffice and the amplifier must be heavily compensated
which will decrease overall bandwidth and slew rate. For R14 =
1 kΩ and C
C
= 15 pF, the reference amplifier slews at 4 mA/µs
enabling a transition from I
REF
= 0 to I
REF
= 2 mA in 500 ns.
Operation with pulse inputs to the reference amplifier may be
accommodated by an alternate compensation scheme. This
technique provides lowest full-scale transition times. An internal
clamp allows quick recovery of the reference amplifier from a
cutoff (I
REF
= 0) condition. Full-scale transition (0 mA to 2 mA)
occurs in 120 ns when the equivalent impedance at pin 14 is
200 Ω and C
C
= 0. This yields a reference slew rate of 16 mA/µs
which is relatively independent of R
IN
and V
IN
values.
LOGIC INPUTS
The DAC08 design incorporates a unique logic input circuit
which enables direct interface to all popular logic families and
provides maximum noise immunity. This feature is made pos-
sible by the large input swing capability, 2 µA logic input cur-
rent and completely adjustable logic threshold voltage. For V– =
–15 V, the logic inputs may swing between –10 V and +18 V.
This enables direct interface with +15 V CMOS logic, even
when the DAC08 is powered from a +5 V supply. Minimum in-
put logic swing and minimum logic threshold voltage are given
by: V– plus ( I
REF
× 1 kΩ) plus 2.5 V. The logic threshold may
be adjusted over a wide range by placing an appropriate voltage
at the logic threshold control pin (pin 1, V
LC
). The appropriate
graph shows the relationship between V
LC
and V
TH
over the
temperature range, with V
TH
nominally 1.4 above V
LC
. For
TTL and DTL interface, simply ground pin 1. When interfacing
ECL, an I
REF
= 1 mA is recommended. For interfacing other
logic families, see preceding page. For general set-up of the logic
control circuit, it should be noted that pin 1 will source 100 µA
typical; external circuitry should be designed to accommodate
this current.
Fastest settling times are obtained when pin 1 sees a low imped-
ance. If pin 1 is connected to a 1 kΩ divider, for example, it
should be bypassed to ground by a 0.01 µF capacitor.
ANALOG OUTPUT CURRENTS
Both true and complemented output sink currents are provided
where I
O
+
I
O
= I
FS
. Current appears at the “true” (I
O
) output
when a “1” (logic high) is applied to each logic input. As the bi-
nary count increases, the sink current at pin 4 increases propor-
tionally, in the fashion of a “positive logic” D/A converter. When a
“0” is applied to any input bit, that current is turned off at pin 4
and turned on at pin 2. A decreasing logic count increases
I
O
as
in a negative or inverted logic D/A converter. Both outputs may
be used simultaneously. If one of the outputs is not required it
must be connected to ground or to a point capable of sourcing
I
FS
; do not leave an unused output pin open.
Both outputs have an extremely wide voltage compliance en-
abling fast direct current-to-voltage conversion through a resis-
tor tied to ground or other voltage source. Positive compliance
is 36 V above V– and is independent of the positive supply.
Negative compliance is given by V– plus (I
REF
× 1 kΩ) plus 2.5 V.
The dual outputs enable double the usual peak-to-peak load
swing when driving loads in quasi-differential fashion. This fea-
ture is especially useful in cable driving, CRT deflection and in
other balanced applications such as driving center-tapped coils
and transformers.
POWER SUPPLIES
The DAC08 operates over a wide range of power supply volt-
ages from a total supply of 9 V to 36 V. When operating at sup-
plies of ±5 V or less, I
REF
≤ 1 mA is recommended. Low
reference current operation decreases power consumption and
increases negative compliance, reference amplifier negative
common-mode range, negative logic input range, and negative
logic threshold range; consult the various figures for guidance.
For example, operation at –4.5 V with I
REF
= 2 mA is not rec-
ommended because negative output compliance would be re-
duced to near zero. Operation from lower supplies is possible,
however at least 8 V total must be applied to insure turn-on of
the internal bias network.
Symmetrical supplies are not required, as the DAC08 is quite
insensitive to variations in supply voltage. Battery operation is
feasible as no ground connection is required: however, an artifi-
cial ground may be used to insure logic swings, etc. remain be-
tween acceptable limits.
Power consumption may be calculated as follows:
P
d
= (I+) (V+) + (I–) (V–). A useful feature of the DAC08 design
is that supply current is constant and independent of input logic
states; this is useful in cryptographic applications and further
serves to reduce the size of the power supply bypass capacitors.
TEMPERATURE PERFORMANCE
The nonlinearity and monotonicity specifications of the DAC08
are guaranteed to apply over the entire rated operating tempera-
ture range. Full-scale output current drift is low, typically
±10 ppm/°C, with zero-scale output current and drift essentially
negligible compared to 1/2 LSB.
The temperature coefficient of the reference resistor R14 should
match and track that of the output resistor for minimum overall
full-scale drift. Settling times of the DAC08 decrease approxi-
mately 10% at –55°C; at +125°C an increase of about 15%
is typical.
The reference amplifier must be compensated by using a capaci-
tor from pin 16 to V–. For fixed reference operation, a 0.01 µF
capacitor is recommended. For variable reference applications,
see previous section entitled “Reference Amplifier Compensa-
tion for Multiplying Applications”.
DAC08
–11–
REV. A
MULTIPLYING OPERATION
The DAC08 provides excellent multiplying performance with an
extremely linear relationship between I
FS
and I
REF
over a range
of 4 mA to 4 mA. Monotonic operation is maintained over a
typical range of I
REF
from 100 µA to 4.0 mA.
SETTLING TIME
The DAC08 is capable of extremely fast settling times, typically
85 ns at I
REF
= 2.0 mA. Judicious circuit design and careful
board layout must be employed to obtain full performance po-
tential during testing and application. The logic switch design
enables propagation delays of only 35 ns for each of the 8 bits.
Settling time to within 1/2 LSB of the LSB is therefore 35 ns,
with each progressively larger bit taking successively longer. The
MSB settles in 85 ns, thus determining the overall settling time
of 85 ns. Settling to 6-bit accuracy requires about 65 ns to 70 ns.
The output capacitance of the DAC08 including the package is
approximately 15 pF, therefore the output RC time constant
dominates settling time if R
L
> 500 Ω.
Settling time and propagation delay are relatively insensitive to
logic input amplitude and rise and fall times, due to the high
gain of the logic switches. Settling time also remains essentially
constant for I
REF
values. The principal advantage of higher I
REF
values lies in the ability to attain a given output level with lower
load resistors, thus reducing the output RC time constant.
Measurement of settling time requires the ability to accurately
resolve ±4 µA, therefore a 1 kΩ load is needed to provide ad-
equate drive for most oscilloscopes. The settling time fixture
shown in schematic labelled “Settling Time Measurement” uses
a cascode design to permit driving a 1 kΩ load with less than
5 pF of parasitic capacitance at the measurement node. At I
REF
values of less than 1.0 mA, excessive RC damping of the output
is difficult to prevent while maintaining adequate sensitivity.
However, the major carry from 01111111 to 10000000 provides
an accurate indicator of settling time. This code change does
not require the normal 6.2 time constants to settle to within
±0.2% of the final value, and thus settling times may be ob-
served at lower values of I
REF
.
DAC08 switching transients or “glitches” are very low and may
be further reduced by small capacitive loads at the output at a
minor sacrifice in settling time.
Fastest operation can be obtained by using short leads, minimiz-
ing output capacitance and load resistor values, and by adequate
bypassing at the supply, reference and V
LC
terminals. Supplies
do not require large electrolytic bypass capacitors as the supply
current drain is independent of input logic states; 0.1 µF capaci-
tors at the supply pins provide full transient protection.
Figure 30. Settling Time Measurement
DAC08
–12– REV. A
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
000000000
PRINTED IN U.S.A.
N-16
16
18
9
0.840 (21.33)
0.745 (18.93)
0.280 (7.11)
0.240 (6.10)
PIN 1
SEATING
PLANE
0.022 (0.558)
0.014 (0.356)
0.060 (1.52)
0.015 (0.38)
0.210 (5.33)
MAX 0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
0.100
(2.54)
BSC
0.160 (4.06)
0.115 (2.93)
0.325 (8.25)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.115 (2.93)
Q-16
16
18
9
0.310 (7.87)
0.220 (5.59)
PIN 1
0.005 (0.13) MIN 0.080 (2.03) MAX
SEATING
PLANE
0.023 (0.58)
0.014 (0.36)
0.200 (5.08)
MAX
0.840 (21.34) MAX
0.150
(3.81)
MIN
0.070 (1.78)
0.030 (0.76)
0.200 (5.08)
0.125 (3.18) 0.100
(2.54)
BSC
0.060 (1.52)
0.015 (0.38)
15°
0°
0.320 (8.13)
0.290 (7.37)
0.015 (0.38)
0.008 (0.20)
E-20
TOP
VIEW
0.358 (9.09)
0.342 (8.69)
SQ
1
20 4
9
8
13
19
BOTTOM
VIEW
14
3
18
0.028 (0.71)
0.022 (0.56)
45° TYP
0.015 (0.38)
MIN
0.055 (1.40)
0.045 (1.14)
0.050 (1.27)
BSC
0.075 (1.91)
REF
0.011 (0.28)
0.007 (0.18)
R TYP
0.095 (2.41)
0.075 (1.90)
0.100 (2.54) BSC
0.200 (5.08)
BSC
0.150 (3.81)
BSC
0.075
(1.91)
REF
0.358
(9.09)
MAX
SQ
0.100 (2.54)
0.064 (1.63)
0.088 (2.24)
0.054 (1.37)
SO-16
16 9
81
0.3937 (10.00)
0.3859 (9.80)
0.2550 (6.20)
0.2284 (5.80)
0.1574 (4.00)
0.1497 (5.80)
PIN 1
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.0688 (1.75)
0.0532 (1.35)
0.0500
(1.27)
BSC 0.0099 (0.25)
0.0075 (0.19) 0.0500 (1.27)
0.0160 (0.41)
8°
0°
0.0196 (0.50)
0.0099 (0.25) x 45°
Package/Price Information
For detailed packaging information, please select the Datasheets button.
8-Bit, High Speed, Multiplying D/A Converter (Universal Digital Logic Interface)
Model Status Package
Description Pin
Count Temperature
Range Price*
(100-499)
5962-89932012A PRODUCTION CER. LEADLESS CHIP
CARRIER 20 TBD $31.68
DAC08AQ PRODUCTION CERDIP GLASS SEAL 16 MILITARY $6.05
DAC08AQ/883C PRODUCTION CERDIP GLASS SEAL 16 MILITARY $8.25
DAC08CP PRODUCTION PLASTIC/EPOXY DIP 16 MILITARY $1.20
DAC08CQ PRODUCTION CERDIP GLASS SEAL 16 MILITARY $1.38
DAC08CS PRODUCTION STD S.O. PKG (SOIC) 16 MILITARY $1.20
DAC08EP PRODUCTION PLASTIC/EPOXY DIP 16 COMMERCIAL $1.50
DAC08EQ PRODUCTION CERDIP GLASS SEAL 16 INDUSTRIAL $1.87
DAC08ES PRODUCTION STD S.O. PKG (SOIC) 16 COMMERCIAL $1.50
DAC08GBC PRODUCTION CHIPS/DIE SALES - TBD $1.20
DAC08GRBC PRODUCTION CHIPS/DIE SALES - TBD $0.82
DAC08GTBC OBSOLETE CHIPS/DIE SALES - TBD -
DAC08HP PRODUCTION PLASTIC/EPOXY DIP 16 COMMERCIAL $2.25
DAC08HQ PRODUCTION CERDIP GLASS SEAL 16 MILITARY $2.75
DAC08NBC PRODUCTION CHIPS/DIE SALES - TBD $1.90
DAC08NTBC PRODUCTION CHIPS/DIE SALES - TBD $4.00
DAC08Q PRODUCTION CERDIP GLASS SEAL 16 TBD $4.40
DAC08Q/883C PRODUCTION CERDIP GLASS SEAL 16 TBD $6.60
DAC08RC/883C PRODUCTION CER. LEADLESS CHIP
CARRIER 20 TBD $23.80
JM38510/11301BEA PRODUCTION CERDIP GLASS SEAL 16 MILITARY $16.50
* This price is provided for budgetary purposes as recommended list price in U.S. Dollars per unit the
stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing. View
Pricing and Availability (currently available to North American customers) for further information.
Analog Products -- DAC08
file:///F|/cpl_new_images/DAC08.html [7/18/2001 5:35:55 PM]
