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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： | 14/18页 |
| 文件大小： | 186K |
| 代理商： | E710-EDGE710 |
5
2000 Semtech Corp.
www.semtech.com
HIGH-PERFORMANCE PRODUCTS – ATE
Edge710
Circuit Description (continued)
Driver Slew Rate Adjustment
The driver rising and falling transition times are
independently adjustable. The RADJ and FADJ pins are
analog current inputs which establish the driver rise and
fall times.
Ideally, an external current source would be used for RADJ
and FADJ. However, for most applications (where the rise
and fall times are fixed), precision external resistors to a
positive voltage are acceptable. The currents into RADJ
and FADJ follow the equation:
RADJ, FADJ = (VCC - 0.7) / (Rext + 1.5).
Input Power Down
IPD_D is a TTL compatible input which affects both the
driver speed as well as high impedance leakage. With
IPD_D = 0, the driver functions normally. With IPD_D =
1, the driver is in IPD mode, where it still functions,
although with slower rise and fall times, but with an
extremely low HiZ leakage current.
Do not leave IPD_D floating !! If IPD_D is not used,
connect it to ground.
LOAD > VCM_IN
1.5K
Rise/Fall ¤
Adjust Current
RADJ (FADJ)
Load
The load is capable of sourcing and sinking at least 35
mA dynamically, or being placed into a high impedance
state. The load may also be configured with separate
commutating voltage to act as a programmable voltage
clamp.
In addition, the load may act as a 50
transmission line termination.
Load Enable
The load enable input determines whether the load is active
or in high impedance. If LD_EN is more positive than
LD_EN*, the load is active and is capable of sourcing and
sinking currents. If LD_EN is more negative than LD_EN*,
the load is placed into a high impedance state.
LD_EN / LD_EN* are "Flex In" - wide voltage differential
inputs capable of receiving ECL, TTL, CMOS, or custom
levels. Single-ended operation is supported by connecting
the inverting input to the appropriate DC threshold level.
Do NOT leave LD_EN / LD_EN* floating.
Commutating Voltage
VCM_IN is a high input impedance analog voltage input
which sets the commutating voltage of the load. If LOAD
is more positive than VCM_IN, the bridge will sink current
from the DUT into the load. If LOAD is more negative than
VCM_IN, the load will source current from the load into
the DUT.
LOAD < VCM_IN
VCM_IN
DUT
VCM_IN
DUT
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