®
®
ADS-926
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.
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.
N
START
CONVERT
200ns
±25ns
N+1
10ns typ.
INTERNAL S/H
Hold
610ns typ.
Acquisition Time
1390ns ±55ns
10ns typ.
Conversion Time
EOC
480ns ±20ns
70ns ±10ns
35ns max.
115ns max.
OUTPUT
DATA
Data (N – 1) Valid
Invalid
Data
Notes: 1. f
s
= 500kHz.
2. The ADS-926 is a pulse-triggered device. Its internal operations
are triggered by both the rising and falling edges of the start
convert pulse. When sampling at 500kHz, the start pulse must be
between 175 and 225nsec wide. For lower sampling rates, wider
start pulses may be used, however, a 50nsec minimum pulse
width low must be maintained.
Figure 4. ADS-926 Timing Diagram
Data N Valid (1885ns min.)
5
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
