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PDF Edge693 Data sheet ( Hoja de datos )
| Número de pieza | Edge693 | |
| Descripción | 500 MHz Monolithic Dual Pin Electronics Driver | |
| Fabricantes | Semtech | |
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EDGE HIGH-PERFORMANCE PRODUCTS
Description
Edge693
500 MHz Monolithic
Dual Pin Electronics Driver
Applications
The Edge693 is a dual pin electronics driver solution • Memory Test Equipment
manufactured in a high-performance, complementary • Instrumentation
bipolar process. In Automatic Test Equipment (ATE)
applications, the Edge693 offers two pin drivers suitable
for drive-only channels in memory testers, as well as for
bidirectional channels in memory, VLSI, and mixed- signal
test systems.
Each driver is completely isolated from the other. There
are separate data, enable, slew rate adjust, high and
low levels; as well as power supply inputs for each driver.
The driver output slew rate is adjustable from 3 V/ns to
1 V/ns, allowing the matching of edges from channel-to-
channel, as well as slowing down edges for noise
sensitive applications.
Each driver is capable of driving 9 V signals over a 12 V
range, in addition to going into a high impedance state.
The Edge693 can generate ECL signals up to 500 MHz
and 3V signals in excess of 300 MHz.
Combining two independent drivers into a 28-pin PLCC
package offers a highly integrated solution appropriate
where speed and density are at a premium.
Features
• >2.5 V/ns Driver Slew Rates
• Adjustable Driver Slew Rates
• HiZ Capability
• 12 V Output Range
• 9 V Output Swings
• 28-Pin PLCC with an Internal
Heat Spreader
Functional Block Diagram
DRVENA
DRVENA*
DHIA
DHIA*
DVHA
DVLA
BIAS
DRVENB
DRVENB*
DHIB
DHIB*
DVHB
DVLB
SLEWADJA VCCA GNDA VEEA
DRIVER A
EN
DOUTA
DRIVER B
EN
DOUTB
SLEWADJB VCCB GNDB VEEB
Revision 1 / August 4, 2000
1
www.semtech.com
1 page  
EDGE HIGH-PERFORMANCE PRODUCTS
Circuit Description (continued)
Edge693
For system level flexibility, the SLEWADJ input is designed
to allow a voltage DAC, a current DAC, or a resistor to a
fixed voltage as possible slew rate control mechanisms
(see Figure 3).
SLEWADJ
1.5KΩ
DVLCAP / DVHCAP
These two analog nodes are brought out to better
stabilize the high and low driver levels. Much like placing
decoupling capacitors on the DVL and DVH input pins,
the DVLCAP and DVHCAP pins require a fixed .01 µF
chip capacitor (with good high frequency characteristics)
to ground (see Figure 5). A tight layout with minimum
etch is recommended.
Edge693
Rise/Fall
Adjust Current
.01 µF
DVLCAP DVHCAP
.01 µF
Figure 3. SLEWADJ Inputs
Driver Bias
The BIAS pin is an analog current input that requires a
1.2 mA fixed reference current for the driver. Several
circuit configurations are usable to satisfy this
requirement, the most simple being a fixed resistor to a
fixed power supply, typically VCC (see Figure 4). Looking
into the BIAS node shows a .7 V voltage source with a
1.5 KW impedance, so the equation to select the fixed
resistor is:
Figure 5. DVLCAP and DVHCAP
Thermal Monitor
The Edge693 includes an on-chip thermal monitor
accessible through the THERMAL DIODE pin. This node
connects to 5 diodes in series to VEE (see Figure 6) and
may be used to accurately measure the junction
temperature at any time.
Thermal Diode
(VCC – .7) / (R + 1.5) = 1.2 mA
Bias Current
Alternatively, a current DAC could be used to either
program the BIAS current or to perform subtle
adjustments in the fixed value.
˚Temperature coefficient = –10 mV/ C
VCC
Edge693
1.2 mA
R
Bias
Figure 4. Bias Current Generation
VEE
Figure 6. Thermal Diode String
A bias current of 100 µA is injected into this node, and
the measured voltage corresponds to a specific junction
temperature with the following equation:
TJ(˚C) = {(VTHERMAL DIODE – VEE) / 5 – .7} / (–.00208).
2000 Semtech Corp.
5 www.semtech.com
5 Page 
EDGE HIGH-PERFORMANCE PRODUCTS
Ordering Information
Model Number
E693AHJ
EVM693AHJ
Package
28-Pin PLCC
(with Internal Heat Spreader)
Edge693 Evaluation Module
Edge693
Contact Information
2000 Semtech Corp.
Semtech Corporation
Edge High-Performance Division
10021 Willow Creek Rd., San Diego, CA 92131
Phone: (858)695-1808 FAX (858)695-2633
11
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11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet Edge693.PDF ] | |
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