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| 型号： | E710-EDGE710 |
| 英文描述： | 500 MHz Pin Electronics Driver. Window Comparator. and Load |
| 中文描述： | 500兆赫引脚电子驱动器。窗口比较器。和负载 |
| 文件页数： | 16/18页 |
| 文件大小： | 186K |
| 代理商： | E710-EDGE710 |
7
2000 Semtech Corp.
www.semtech.com
HIGH-PERFORMANCE PRODUCTS – ATE
Edge710
Circuit Description (continued)
Window Comparator
Two comparators are connected on-chip to form a window
comparator to determine whether the DUT is high, low, or
in an indeterminant state. VINP is tied to the positive
inputs of both comparators.
The selection of either comparator A or B for the DUT high
versus the DUT low is arbitrary. However, because the
positive input is used on both comparators, the comparator
used to detect DUT low will have an inversion at it digital
outputs.
The figure below shows the correct polarity for the
comparator connections.
Thresholds
CVA and CVB are the two comparator threshold levels.
These inputs are high impedance voltage controlled inputs
that determine at which VINP voltage the comparators
will change output states.
PECL Level Capability
PECL is the power supply level for the output stage of the
comparators. When connected to ground, the comparator
outputs will be standard ECL outputs. However, by making
PECL more positive, QA / QA* and QB / QB* will track
PECL and also become more positive.
By raising these voltage levels, the comparators may
connect directly with CMOS ICs.
QA*
QA
QB
QB*
IPD_C
PECL
CVA
VINP
CVB
The power supply driving the PECL pin must be capable of
sourcing all the current flowing out of the QA/QA* and QB/
QB* open emitter outputs.
Comparator Input Protection
VINP connect to over-voltage diodes connected to the
positive and negative power supplies. These diodes are
sized to handle up to 100 mA current.
Thermal Monitor
An on-chip thermal diode string of five diodes in series
exists (see figure below). This string allows accurate die
temperature measurements.
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 – .7752} / (–.0018).
ANODE
CATHODE
Temperature Coefficient = –9 mV / C
Bias Current
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