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參數(shù)資料
| 型號： | E211-EDGE211 |
| 英文描述： | Dual Pin Electronics Driver |
| 中文描述： | 雙引腳電子驅(qū)動器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 88K |
| 代理商： | E211-EDGE211 |
6
2000 Semtech Corp.
www.semtech.com
HIGH-PERFORMANCE PRODUCTS – ATE
Edge211
Application Information
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
into a 50 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.
Power Supply Sequencing
The following sequence should be used when powering
up the Edge211.
1.
VCC
2.
VEE
3.
Analog inputs (VH, VL , VTT)
4.
Digital inputs (VTTEN, DVREN, DATA)
Latchup Protection
The Edge211 has several power supply requirements to
protect the part in power supply fault situations, as well
as during power up and power down sequences. VCC
must remain greater than or equal to VDD (external supply
for the digital logic) at all times. Both VCC and VDD must
always be positive (above ground), and VEE must always
be negative (at or below ground).
The three diode configuration shown in Figure 2 should
be used on a once-per-board basis.
Figure 2.
Power Supply Protection Scheme
gure 5.
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.
VCC
VDD
VEE
1N5820 or
Equivalent
External
System
Ground
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