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參數(shù)資料
| 型號： | E670-EDGE670 |
| 英文描述： | 500 MHz Window Comparator |
| 中文描述： | 500兆赫窗口比較器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 124K |
| 代理商： | E670-EDGE670 |
5
2000 Semtech Corp.
www.semtech.com
HIGH-PERFORMANCE PRODUCTS – ATE
PRELIMINARY
Edge670
Circuit Description (continued)
Figure 3. Input Protection
For a wider protected input range, an additional external
series resistor may be added.
Comparator PECL Output Capability
PECL is a variable analog voltage power supply that
determines the common mode voltage of the comparator
digital outputs.
With PECL connected to ground, the
Edge670 generates standard differential ECL outputs.
However, the outputs will track the PECL input, and
remaining one diode drop below it as PECL is varied
between ground and +5V. By setting PECL appropriately,
a fully differential comparator output may interface
directly to a CMOS ASIC without any translators.
Input Power Down
The Edge670 comparator has a mechanism where it can
drastically reduce the input bias current flowing into the
VINP pin, while still maintaining a functional comparator.
In this mode, however, the comparator slows down
significantly and can no longer track fast edges, in
particular, fast falling edges.
The IPD pin is a TTL compatible input which controls the
two modes. With IPD = low, the comparator is in its
normal high speed mode, supporting maximum AC
performance.
With IPD = high, the comparator is in Power Down Mode.
The input bias current decreases to < 100 nA.
The
comparator still functions, but can track edges only up
to 25 mV/ns.
Thermal Monitor
The Edge670 includes an on-chip thermal monitor
accessible through the CATHODE and ANODE. These
nodes connect to five diodes in series (see Figure 4)
and may be used to accurately measure the junction
temperature at any time.
An external bias current of 100
A is injected through
the string, and the measured voltage corresponds to a
specific junction temperature with the following equation:
Tj[
°C] = {(ANODE - CATHODE)/5 - .7} / (-.00208).
Figure 4. Thermal Diode String
Bias Current
Temperature coefficient = –10 mV/C
ANODE
CATHODE
VINP
VCC
VEE
–
+
–
+
50
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