DAC8560A BURR-BROWN [Burr-Brown Corporation], DAC8560A Datasheet - Page 23

• Manufacturer Part Number: DAC8560A
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

Long-Term Stability
Long-term stability/aging refers to the change of the
output voltage of a reference over a period of months
or years. This effect lessens as time progresses, as
shown in
curve. The typical drift value for the DAC8560
internal reference is 50ppm from 0 hours to 1900
hours.
powering-up and measuring 20 units at regular
intervals for a period of 1900 hours.
Thermal Hysteresis
Thermal hysteresis for a reference is defined as the
change in output voltage after operating the device
at +25 C, cycling the device through the specified
temperature range, and returning to +25 C. It is
expressed in
Where:
DAC NOISE PERFORMANCE
Typical noise performance for the DAC8560 with the
internal reference enabled is shown in
Figure
versus frequency is depicted in
full-scale, midscale, and zero scale input codes. The
typical noise density for midscale code is 170nV/ Hz
at 1kHz and 100nV/ Hz at 1MHz. High-frequency
noise can be improved by filtering the reference
noise as shown in
capacitor is connected to the V
to the no-load condition. Integrated output noise
between 0.1Hz and 10Hz is close to 50 V
(midscale), as shown in
BIPOLAR OPERATION USING THE DAC8560
The DAC8560 has been designed for single-supply
operation, but a bipolar output range is also possible
using the circuit in either
circuit shown gives an output voltage range of V
Rail-to-rail operation at the amplifier output is
achievable using an
V
HYST
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V
V
pre-temperature cycling.
V
device has been cycled through the temperature
range of –40 C to +120 C, and returned to
+25 C.
HYST
REF_PRE
REF_POST
+
41. Output noise spectral density at pin V
This
= thermal hysteresis.
V
Figure
REF_PRE
Equation
= output voltage measured at +25 C
= output voltage measured after the
parameter
V
REF_NOM
6, the typical long-term stability
* V
OPA703
Figure
3:
REF_POST
Figure
Figure 69
40, where a 4 F load
is
as the output amplifier.
REF
41.
characterized
pin and compared
or
10
Figure 39
6
Figure
(ppm)
Figure 39
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70. The
REF
OUT
for
by
PP
to
.
The output voltage for any input code can be
calculated as using
where D represents the input code in decimal
(0–65535).
With V
This result has an output voltage range of 5V with
0000h corresponding to a –5V output and FFFFh
corresponding to a 5V output, as shown in
Similarly, using the internal reference, a 2.5V output
voltage range can be achieved, as shown in
Figure
V
V
Figure 69. Bipolar Output Range Using External
Figure 70. Bipolar Output Range Using Internal
V
O
O
REF
+ V
+ 10
150nF
REF
10 F
70.
65536
m
Serial Interface
REF
Three-Wire
= 5V, R
V
V
REF
V
DD
DD
D
0.1 F
m
65536
DAC8560
* 5V
Serial Interface
10kW
Three-Wire
D
1
Reference at 5V
V
R
V
REF
V
1
= R
Equation
DD
DD
Reference
DAC8560
2
10kW
GND
= 10k .
R
V
1
V
OUT
FB
R
1
4:
R
) R
GND
V
V
OUT
1
FB
SLAS464 – DECEMBER 2006
2
OPA703
10kW
+6V
-6V
R
* V
2
OPA703
10kW
+6V
-6V
R
REF
2
DAC8560
Figure
±2.5V
R
R
2
1
±5V
69.
23