Linear Technology LTC6655 Demo Manual

DESCRIPTION
Demonstration circuit 2095A features the
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
PERFORMANCE SUMMARY
SYMBOL
V
IN
V
OUT
Long-Term Drift of Output Voltage
I
Q
LTC 6655, a
®
Specifications are at T
PARAMETER
Input Supply Range
Output Voltage Accuracy
Supply Current
DEMO MANUAL DC2095A
0.25ppm Noise, Low Drift
Precision Reference
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
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.
= 25°C
A
CONDITIONS MIN
V + 0.5
OUT
–0.025
LTC6655
TYP MAX UNITS
13
+0.025
20 ppm/√kHr
5
dc2095af
V
%
mA
1