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参数资料
| 型号： | E749-EDGE749 |
| 英文描述： | Octal Pin Electronics Driver / Receiver |
| 中文描述： | 八路引脚电子驱动器/接收器 |
| 文件页数： | 12/15页 |
| 文件大小： | 152K |
| 代理商： | E749-EDGE749 |
6
Revision 3 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge749
Application Information
Power Supplies
The Edge749 uses three power supplies: VDD, VCC and
VEE. VDD is the digital supply for all of the data inputs
and outputs. VCC and VEE are the analog power supplies
for the Edge749 drivers and comparators. In order to
protect the Edge749 and avoid damaging it, the following
power supply requirements must be satisifed at all times:
VEE
≤ GND ≤ VDD ≤ VCC
Also,
VEE
≤ All Inputs ≤ VCC at all times
The three-Schottky diode configuration shown in Figure
5, used on a once-per-board basis, insures power supply
sequence and fault tolerance.
Figure 5. Power Supply Protection Scheme
Power-On Sequencing
Power-Off Sequencing
1. VCC (substrate)
1. Inputs
2. VEE
2. VDD
3. VDD
3. VEE
4. Inputs
4. VCC
Power Supplies Decoupling
VDD, which provides the digital power, should be
decoupled to GND with a .1
F chip capacitor in parallel
with a .001
F chip capacitor. The bypass capacitors
should be as close to the device as possible. Power and
ground planes are recommended to provide a low
inductance return path.
VCC and VEE, which power the DUT drivers and receivers,
should also be decoupled to GND with a .1
F chip
capacitor in parallel with a .001
F chip capacitor. A
VCC and VEE plane, or at least a solid power bus, is
recommended for optimal performance.
VHIGH and VLOW Decoupling
As the VHIGH and VLOW 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.
Expanding the Common Mode Range
Although the Edge749 can drive and receive 18 V swings,
these 18 V signals can be adjusted over an 21 V range.
By using programmable regulators V1 and V2 for the
VCC and VEE supplies (feasible because these two
analog power supplies do not supply driver output
current), the Edge749 I/O range can be optimized for a
variety of applications (see Figure 6).
Figure 6.
There are three rules which govern the supplies V1 and
V2:
1) +10V < V1 < +18V
2) –3V < V2 < 0V
3) (V1 – V2) < +18V.
VCC
VDD
VEE
1N5820 or
Equivalent
V1
Edge 749
V2
VCC
VDD
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