®
®
ADS-118/118A
THERMAL REQUIREMENTS
All DATEL sampling A/D converters are fully characterized
and specified over operating temperature (case) ranges of
0 to +70°C and –55 to +125°C. All room temperature
(T
A
= +25°C) production testing is performed without the use
of heat sinks or forced air cooling. Thermal impedance
figures for each device are listed in their respective
specification tables.
These devices do not normally require heat sinks, however,
standard precautionary design and layout procedures should
be used to ensure devices do not overheat. The ground and
power planes beneath the package, as well as all pcb signal
runs to and from the device, should be as heavy as possible
to help conduct heat away from the package.
0
–10
Electrically-insulating, thermally-conductive "pads" may be
installed underneath the package. Devices should be soldered
to boards rather than socketed, and of course, minimal air flow
over the surface can greatly help reduce the package
temperature.
In more severe ambient conditions, the package/junction
temperature of a given device can be reduced dramatically
(typically 35%) by using one of DATEL's HS Series heat sinks.
See Ordering Information for the assigned part number. See
page 1-183 of the DATEL Data Acquisition Components
Catalog for more information on the HS Series. Request
DATEL Application Note AN8, "Heat Sinks for DIP Data
Converters",
or contact DATEL directly, for additional information.
Amplitude Relative to Full Scale (dB)
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
250
kHz
500
kHz
750
kHz
1
MHz
1.25
MHz
1.5
MHz
1.75
MHz
2
MHz
2.25
MHz
2.5
MHz
Frequency
(fs = 5MHz, fin = 2.45MHz, Vin = –0.5dB, 4,096-point FFT)
Figure 5. FFT Analysis of ADS-118
+0.67
DNL
(LSB's)
Number of Occurences
0
0.47
0
Digital
Output Code
4096
0
Digital
Output Code
4096
Figure 6. ADS-118 Histogram and Differential Nonlinearity
6
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
