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| 型号： | E646-EDGE646 |
| 英文描述： | Pin Electronics Driver. Window Comparator. and Switch Matrix |
| 中文描述： | 引脚电子驱动程序。窗口比较器。和开关矩阵 |
| 文件页数： | 10/14页 |
| 文件大小： | 140K |
| 代理商： | E646-EDGE646 |
5
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge646
Load
The Edge646 provides a total of 3 analog switches.
Individual switches vary in both their on resistance and
their on/off time (see Table 4).
Like the driver digital inputs, the switch matrix control inputs
SW0-3 EN* are technology independent as VBB
determines their threshold level. The switch control is
documented in Table 3.
Table 3. Switch Matrix Truth Table
Table 4. Switch Matrix Characteristics
Do NOT leave any digital input pins floating.
Circuit Description (continued)
Receiver Functionality
The Edge646 supports an on-board window comparator.
CVB and CVA are high impedance analog inputs which
establish the threshold voltages. COMPA and COMPB are
the digital outputs which reflect the real time status of
VINP. Table 2 summarizes the relationship between the
threshold levels, VINP, and the output signals.
Table 2. Comparator Truth Table
Comparator Outputs
The comparator outputs are 50
output impedance non-
tristatable drivers designed to cleanly drive 50
transmission lines without requiring any external series
termination resistors. Input pins LOW LEVEL and HIGH
LEVEL establish the logic 0 and 1 levels respectively. In
normal operation, LOW LEVEL would be connected to
ground and HIGH LEVEL would be connected to a system
VDD supply, producing CMOS digital swings at the output.
However, the comparator outputs are technology
independent in that they can drive PECL, 3V CMOS, ECL,
LV CMOS, GTL, and custom levels by varying LOW LEVEL
and HIGH LEVEL. For example, should a 3V swing be
desired, HIGH LEVEL could be connected to a 3.0V power
supply.
Notice that HIGH LEVEL and LOW LEVEL provide both the
voltage level and the current for the comparator outputs.
HIGH LEVEL and LOW LEVEL may be varied between +5V
and -2V.
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