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參數(shù)資料
| 型號： | E720-EDGE720 |
| 英文描述： | 500 MHz Pin Electronics Driver. Window Comparator. and Load |
| 中文描述： | 500兆赫引腳電子驅(qū)動器。窗口比較器。和負載 |
| 文件頁數(shù)： | 4/31頁 |
| 文件大?。?/td> | 221K |
| 代理商： | E720-EDGE720 |
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Edge720
TEST AND MEASUREMENT PRODUCTS
Revision 4 / September 24, 2002
Commutating Voltage Compensation
The VCM_CAP_A(B) pins are internal commutating buffer
compensation pins that require a fixed 0.01
F chip
capacitor (with good high frequency characteristics)
connected to GND.
Commutating Buffer Outputs
VCM_OUT_A(B) are connected to the outputs of the on-
chip commutating buffer, whose output voltages are
determined by VCM_IN_A(B) (see Figure 12).
The
connection scheme of these pins will determine the
configuration of the Edge720 load circuit. This allows the
Edge720’s load circuit to be quite versatile in that it can
be configured in multiple ways.
Standard Active Load Configuration
One way to configure the load circuit of the Edge720 is as
a standard active load. In order to operate the load as a
standard active load, VCM_IN_A can be connected to
VCM_IN_B and driven with the same source as shown in
Figure 15.
The 0.01
F bypass capacitors shown in
Figure 15 are needed to supply current to the diode bridge
during fast transients. These capacitors should be placed
as close to the VCM_OUT_A(B) pins as possible to ensure
stability and quick response to fast transitions on the LOAD
output pin.
Figure 15. Edge720 Load Circuit Connected
as a Standard Active Load
Programmable Clamp Configuration
Another way to configure the load circuit of the Edge720
is as a programmable voltage clamp.
Using this
configuration allows the Edge720 load circuitry to be used
as a transmission line termination scheme to minimize
the reflections caused by an unmatched line. Using the
Edge720 load circuit in this configuration offers a superior
clamping solution to the more traditional voltage controlled
diode clamp method. To configure the Edge720 load circuit
as a programmable clamp, the load circuit should be
configured as in Figure 16. The 0.01
F bypass capacitors
shown in Figure 16 are needed to supply current to the
diode bridge during fast transients.
These capacitors
should be placed as close to the VCM_OUT_A(B) pins as
possible to ensure stability and quick response to fast
transitions on the LOAD output pin.
Figure 16. Edge720 Load Circuit Connected
as a Programmable Voltage Clamp
With the load configured in this manner, the voltage at
the LOAD pin will be clamped within a range determined
by the voltage at VCM_OUT_A and VCM_OUT_B.
The
voltage at VCM_OUT_A determines the low voltage-
clamping limit, while the voltage at VCM_OUT_B
determines the high voltage-clamping limit. It is important
to note that when using the load circuit in this manner,
ISC_IN and ISK_IN should be set to their maximum values.
External Diode Bridge Connections
The Edge720 features two pins, BRIDGE_SC and
BRIDGE_SK, which allow access to the top and bottom of
the diode bridge through 1 k
series resistors (see Figure
12). These pins can be connected to external current
sources whenever it is desired to use sources that are
more accurate than the on-chip sources. Connecting these
pins may degrade the high impedance characteristics of
the load when it is not enabled unless isolation relays are
used to isolate the external current sources from the diode
bridge.
Circuit Description (continued)
VCM_IN_A
VCM_IN_B
VCM_OUT_A
VCM_OUT_B
LOAD
+
–
+
–
0.01
F
0.01
F
ISC
ISK
Edge720
VCM_IN_A
VCM_IN_B
VCM_OUT_A
VCM_OUT_B
LOAD
+
–
+
–
0.01
F
0.01
F
ISC
ISK
Edge720
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