1
dc2095af
DEMO MANUAL DC2095A
DESCRIPTION
LTC6655
0.25ppm Noise, Low Drift
Precision Reference
Demonstration circuit 2095A features the
, a
precision low drift reference packaged in a hermetic LS8.
The demonstration circuit is available with the 2.5V, 4.096V
or 5V output voltage option parts.
The demo board circuit shows the optimal layout for overall
reference performance. The LTC6655 has a maximum
drift of 2ppm/°C and an initial accuracy of ±0.025%. The
hermetic package further improves the Long Term Drift
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
performance of the reference to 20ppm/
√kHr
. Another
benefit of the hermetic package is improved humidity
performance. Testing has shown that humidity can cause
the PCB to deform and stress the package. To reduce this
effect the ground plane is removed directly under the
reference. Doing this reduces output voltage shift as a
result of humidity to less than 10ppm.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2095A
Specifications are at T
A
= 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Input Supply Range
V
OUT
+ 0.5
13
V
V
OUT
Output Voltage Accuracy
–0.025
+0.025
%
Long-Term Drift of Output Voltage
20
ppm/√
kHr
I
Q
Supply Current
5
mA
