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參數(shù)資料
| 型號： | ADS-883 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 串行ADC |
| 英文描述： | 14-Bit, 2MHz, Low-Power Sampling A/D Converters |
| 中文描述： | 14位，2MHz的，低功耗采樣A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 190K |
| 代理商： | ADS-883 |
ADS -929
5
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.
Figure 4. ADS-929 Timing Diagram
START
CONVERT
OUTPUT
DATA
N
N + 1
Data (N – 1) Valid
200ns
typ.
INTERNAL S/H
Acquisition Time
10ns typ.
Hold
310ns typ.
Data N Valid
EOC
30ns typ.
Conversion Time
75ns max.
70ns ±10ns
35ns max.
425ns min.
Invalid
Data
360ns ±20ns
190ns
±40ns
Notes: 1. f
s
= 2MHz.
2. The ADS-929 is an edge-triggered device. All internal operations
are triggered by the rising edge of the start convert pulse, which
may be as narrow as 20nsec. All production testing is performed
at a 2MHz sampling rate with 200nsec wide start pulses. For
lower sampling rates, wider start pulses may be used, however, a
minimum pulse width low of 20nsec must be maintained.
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