DAC-08ED ON Semiconductor, DAC-08ED Datasheet - Page 9

• Manufacturer Part Number: DAC-08ED
• Manufacturer: ON Semiconductor

Specifications of DAC-08ED

• Number Of Channels: 1
• Resolution: 8b
• Interface Type: Parallel
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): ±15V
• Settling Time: 0.135us
• Architecture: Current Steering
• Power Supply Requirement: Dual
• Output Type: Current
• Integral Nonlinearity Error: ±0.19LSB
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): ±4.5V
• Dual Supply Voltage (max): ±18V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 16
• Package Type: SOIC
• Lead Free Status / Rohs Status: Not Compliant

Reference Amplifier Drive and Compensation
into Pin 14 regardless of the setup method or reference
supply voltage polarity.
in Figure 2. The reference voltage source supplies the full
reference current. For bipolar reference signals, as in the
multiplying mode, R
corresponding to the minimum input level. R
eliminated with only a small sacrifice in accuracy and
temperature drift.
R
phase margin. For R
minimum capacitor values are 15, 37, and 75 pF,
respectively. The capacitor may be tied to either V
ground, but using V
(Fluctuations in the negative supply have more effect on
accuracy than do any changes in the positive supply.)
grounded and the reference voltage is applied to R
shown. A high input impedance is the main advantage of
this method. The negative reference voltage must be at
least 3.0 V above the V
be handled by connecting R
voltage equal to the peak positive input level at Pin 15.
ground is recommended. The 5.0 V logic supply is not
recommended as a reference voltage, but if a well regulated
5.0 V supply which drives logic is to be used as the
reference, R
the junction of the two resistors bypassed with 0.1 mF to
ground. For reference voltages greater than 5.0 V, a clamp
diode is recommended between Pin 14 and ground.
transistor current source, none of the above compensation
methods applies and the amplifier must be heavily
compensated, decreasing the overall bandwidth.
14
The reference amplifier input current must always flow
Connections for a positive reference voltage are shown
The compensation capacitor value must be increased as
A negative reference voltage may be used if R
When using a DC reference voltage, capacitive bypass to
If Pin 14 is driven by a high impedance such as a
NOTES:
REQ = R
+V
value is increased. This is in order to maintain proper
Typical Values
R
IN
IN
= 5kW
= 10V
IN
FUNCTIONAL DESCRIPTION
14
|| R
Figure 23. Typical Application
0V
P
should be formed of two series resistors with
Pulsed Referenced Operation
EE
15
R
14
IN
EE
increases negative supply rejection.
R
P
can be tied to a negative voltage
+V
values of 1.0, 2.5, and 5.0 kW,
supply. Bipolar input signals may
REF
R
REQ
=200W
REF
OPTIONAL RESISTOR
FOR OFFSET
INPUTS
14
14
15 16
NO CAP
to a positive reference
4
2
15
may be
DAC−08 SERIES
http://onsemi.com
EE
15
14
or
as
is
9
Output Voltage Range
positive than the voltage of the negative supply (Pin 3)
when the reference current is 2.0 mA or less, and at least
8.0 V more positive than the negative supply when the
reference current is between 2.0 mA and 4.0 mA. This is
necessary to avoid saturation of the output transistors,
which would cause serious accuracy degradation.
Output Current Range
negative supply must be at least 8.0 V more negative than
the output voltage. This is due to the increased internal
voltage drops between the negative supply and the outputs
with higher reference currents.
Accuracy
level with respect to its intended value, and is dependent
upon relative accuracy, full-scale accuracy and full-scale
current drift. Relative accuracy is the measure of each
output current level as a fraction of the full-scale current
after zero-scale current has been nulled out. The relative
accuracy of the DAC-08 series is essentially constant over
the operating temperature range due to the excellent
temperature tracking of the monolithic resistor ladder. The
reference current may drift with temperature, causing a
change in the absolute accuracy of output current.
However, the DAC-08 series has a very low full-scale
current drift over the operating temperature range.
"LSB at +25°C at a full-scale output current of 1.992 mA.
The relative accuracy test circuit is shown in Figure 2. The
12-bit converter is calibrated to a full-scale output current
of 1.99219 mA, then the DAC-08 full-scale current is
trimmed to the same value with R
appears at the error amplifier output. The counter is
activated and the error band may be displayed on the
oscilloscope, detected by comparators, or stored in a peak
detector.
a 16-bit accurate D-to-A converter. 16-bit accuracy implies
a total of " part in 65,536, or "0.00076%, which is much
more accurate than the "0.19% specification of the
DAC-08 series.
Monotonicity
analog output greater than or equal to the preceding value
for a corresponding increment in the digital input code. The
DAC-08 series is monotonic for all values of reference
current above 0.5 mA. The recommended range for
operation is a DC reference current between 0.5 mA and
4.0 mA.
The voltage at Pin 4 must always be at least 4.5 V more
Any time the full-scale current exceeds 2.0 mA, the
Absolute accuracy is the measure of each output current
The DAC-08 series is guaranteed accurate to within
Two 8-bit D-to-A converters may not be used to construct
A monotonic converter is one which always provides
14
so that a zero value