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参数资料
| 型号： | E672-EDGE672 |
| 英文描述： | 500 MHz Pin Electronics Window Comparator and Load |
| 中文描述： | 500兆赫引脚电子窗口比较器和负载 |
| 文件页数： | 13/15页 |
| 文件大小： | 118K |
| 代理商： | E672-EDGE672 |
7
2000 Semtech Corp.
www.semtech.com
EDGE HIGH-PERFORMANCE PRODUCTS
PRELIMINARY
Edge672
Circuit Description (continued)
Figure 8. 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
outputs generate standard differential ECL levels.
However, the outputs will track the PECL input, 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 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 < 250 nA.
The
comparator still functions, but can track edges only up
to 25 mV/ns.
Thermal Monitor
An on-chip thermal monitor is accessible through the
CATHODE and ANODE pins. These nodes connect to
five diodes in series (see Figure 9) 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 9. Thermal Diode String
VINP
VCC
VEE
–
+
–
+
50
Bias Current
Temperature coefficient = –10 mV/C
ANODE
CATHODE
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