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PDF DAC08HQ Data sheet ( Hoja de datos )

Número de pieza DAC08HQ
Descripción 8-Bit/ High-Speed/ Multiplying D/A Converter (Universal Digital Logic Interface)
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



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a 8-Bit, High Speed, Multiplying D/A Converter
(Universal Digital Logic Interface)
DAC08
FEATURES
Fast Settling Output Current: 85 ns
Full-Scale Current Prematched to ؎1 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: ؎10 ppm/؇C
Wide Power Supply Range: ؎4.5 V to ؎18 V
Low Power Consumption: 33 mW @ ؎5 V
Low Cost
Available in Die Form
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-
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
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

1 page




DAC08HQ pdf
DAC08
Figure 1. Pulsed Reference Operation
Figure 3. Fast Pulsed Reference
Operation
Figure 2. Burn-in Circuit
Figure 4. True and Complimentary
Output Operation
Figure 5. LSB Switching
Figure 6. Full-Scale Settling Time
REV. A
–5–

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DAC08HQ arduino
DAC08
MULTIPLYING OPERATION
The DAC08 provides excellent multiplying performance with an
extremely linear relationship between IFS and IREF over a range
of 4 mA to 4 mA. Monotonic operation is maintained over a
typical range of IREF from 100 µA to 4.0 mA.
SETTLING TIME
The DAC08 is capable of extremely fast settling times, typically
85 ns at IREF = 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 RL > 500 .
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 IREF values. The principal advantage of higher IREF
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 kload 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 kload with less than
5 pF of parasitic capacitance at the measurement node. At IREF
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 IREF.
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 VLC 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
REV. A
–11–

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