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參數(shù)資料
| 型號： | E846-EDGE846 |
| 英文描述： | Pin Electronics Driver. Window Comparator. and Switch Matrix |
| 中文描述： | 引腳電子驅動程序。窗口比較器。和開關矩陣 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 100K |
| 代理商： | E846-EDGE846 |
6
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
Circuit Description (continued)
Power Supplies
The Edge846 uses two power supplies for circuit operation;
VCC and VEE. In order to protect the Edge846 and avoid
damaging it, the following power supply requirements must
be satisifed at all times:
VEE
≤ All Inputs ≤ VCC
The sequence below can be used as a guideline when
operating the Edge846:
Power-On Sequencing
Power-Off Sequencing
1. VCC (substrate)
1. Inputs
2. VEE
3. Inputs
3. VCC
The three diode configuration shown in Figure 2 should
be used on a once-per-board basis to ensure power supply
sequence and fault tolerance.
Figure 2. Power Supply Protection Scheme
Warning: It is extremely important that the voltage
on any device pin does not exceed the range of VEE
–0.5V to VCC +0.5V at any time, either during power
up, normal operation, or during power down. Failure
to adhere to this requirement could result in latchup
of the device, which could be destructive if the
system power supplies are capable of supplying large
amounts of current. Even if the device is not
immediately destroyed, the cumulative damage
caused by the stress of repeated latchup may affect
device reliability.
Power Supplies Decoupling
A .1
F capacitor is recommended between VCC and VEE.
In addition, solid VCC and VEE planes are recommended
to provide a low inductance path for the power supply
currents. These planes will reduce any inductive supply
drops associated with swtiching currents on the power
supply pins. If solid planes are not possible, then wide
power busses are preferable.
VH, VL, and VTT Decoupling
As the VH, VL, and VTT inputs are unbuffered and must
supply the driver output current, decoupling capacitors
for these inputs are recommended in proportion to the
amount of output current the application requires.
In
general, a surge current of 50 mA (5V swings series
terminated with 50 Ohms into a 50 Ohm transmission
line) are the maximum dynamic output currents the driver
should see. The decoupling capacitors should be able to
provide this current for the duration of the round trip time
between the pin electronics and the DUT, and then
recharge themselves before the next such transition would
occur. Once this condition is satisfied, the VH, VL, and
VTT supply voltages are more responsible for establishing
the DC levels associated with each function and recharging
the capacitors, rather than providing the actual dynamic
currents required to drive the DUT transmission line.
Ideally, VH, VL, and VTT would each have a dedicated
power layer on the PC board for the lowest possible
inductance power supply distribution.
VCC
VDD
VEE
1N5820 or
Equivalent
External
System
Ground
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