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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)： | 7/12頁 |
| 文件大?。?/td> | 124K |
| 代理商： | E670-EDGE670 |
4
2000 Semtech Corp.
www.semtech.com
HIGH-PERFORMANCE PRODUCTS – ATE
Edge670
PRELIMINARY
Circuit Description
Window Comparator
Introduction
The Edge670 has two comparators connected on-chip
as a window comparator to determine whether the DUT
is in a high, low, or indeterminate state.
Power Supply Sequencing
The following sequence should be used when powering
up the Edge670.
1. VEE
2. VCC
3. Analog Inputs (VINP, CVA, CVB)
Functionality
The VINP pin is tied to the positive inputs of both
comparators (see Figure 1).
Input Condition
Output Condition
VINP > CVA
QA = High; QA* = Low
VINP < CVA
QA = Low;
QA* = High
VINP > CVB
QB = High; QB* = Low
VINP < CVB
QB = Low;
QB* = High
Figure 1. Comparator Functionality
Thresholds
CVA and CVB are the two comparator threshold levels.
These inputs are high impedance voltage controlled
inputs that determine at which VINP input voltage the
comparator will change states.
Hysteresis
Hysteresis is a measure of the change in threshold
voltage as a function of the comparator output state
(see Figure 2). Typically, hysteresis is used to prevent
multiple comparator output transitions due to slow input
slew rates in a noisy environment. These slower inputs
remain in the transition region for longer periods of time,
allowing any noise present to cause repeated threshold
crossings.
The Edge670 is designed with 4 mV of hysteresis. This
hysteresis is non-adjustable and requires no external
support. The amount of hysteresis was chosen to allow
stable and reliable transitions in most system
environments, without noticeably affecting the
comparator performance.
Figure 2. Hysteresis
The effects of hysteresis are visible in two categories -
offset voltage and propagation delay. The amount of
hysteresis must be large enough to overcome the system
noise floor, yet small enough not to increase offset
voltage effects significantly.
Input Protection
The VINP pin has an internal 50
series resistor and
two over-voltage diodes capable of shunting up to 100
mA (see Figure 3) and, therefore, requires no external
protection circuitry. The over-voltage input range that
the comparator can withstand is determined by the power
supply rails and the following equations:
VEE – .7 – (100 mA * 50
) < VINP <
VCC + .7 + (100 mA * 50
)
or
VEE – 5.7V < VINP < VCC + 5.7V.
QA*
VINP
CVA
CVB
QA
QB
QB*
–
+
–
+
Actual Threshold Voltage
Programmed Threshold
Voltage
2 mV
4 mV
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