ADS-B946 查看數據表（PDF） - Murata Power Solutions
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ADS-B946 Datasheet PDF : 8 Pages
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ADS-946
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
(TA = +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.
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 AN-8, "Heat Sinks for DIP Data Converters," or
contact DATEL directly, for additional information.
START
CONVERT
INTERNAL S/H
EOC
N
20ns
typ.
10ns typ.
70ns typ.
Hold
N+1
Acquisition Time
55ns typ.
60ns max.
20ns typ.
Conversion Time
78ns min., 85ns typ., 90ns max.
25ns typ.
OUTPUT
DATA
Data N-1 Valid
95ns typ.
30ns typ.
Invalid Data
10ns typ.
Data N Valid
Notes:
1. Scale is approximately 5ns per division. Sampling rate = 8MHz.
2. The start convert positive pulse width must be between 10 and 50ns or between 80 and 110ns (when sampling at 8MHz)
to ensure proper operation. For sampling rates less than 8MHz, the start pulse can be wider than 110nsec, however a
minimum pulse width low of 15nsec should be maintained. An 8MHz clock with a 20nsec positive pulse width is used
for all production testing.
Figure 4. ADS-946 Timing Diagram
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