max9687cse Maxim Integrated Products, Inc., max9687cse Datasheet - Page 3

• Manufacturer Part Number: max9687cse
• Description: Dual, Ultra-fast Ecl-output Comparator
• Manufacturer: Maxim Integrated Products, Inc.

Because of the MAX9687’s large gain-bandwidth charac-
teristic, special precautions need to be taken if its high-
speed capabilities are to be used. A PC board with a
ground plane is mandatory. Mount all decoupling capaci-
tors as close to the power-supply pins as possible, and
process the ECL outputs in microstrip fashion, consistent
with the load termination of 50 to 120 . For low-imped-
SWITCHING CHARACTERISTICS
(V
Note 2:
Note 3:
Figure 1. High-speed receiver application with 50 input and out-
put termination. With this configuration, in which a ground plane and
microstrip PC board was used, the minimum slew rate for clean out-
put switching is 1.6V/µs. For sine-wave inputs, this implies a mini-
mum signal size of 360mV
E RMS =
__________Applications Information
Input to Output High
(Notes 2, 3)
Input to Output Low
(Notes 2, 3)
Latch-Enable to Output High
(Notes 2, 3)
Latch-Enable to Output Low
(Notes 2, 3)
Latch-Enable Pulse Width (Note 2)
Minimum Setup Time
Minimum Hold Time
S
= ±5V, T
Slew Rate
2
Not tested, guaranteed by design.
V IN = 100mV, V OD = 10mV.
PARAMETER
V
2 f
IN
A
= +25°C, unless otherwise noted.)
50
50
_______________________________________________________________________________________
Dual, Ultra-Fast ECL-Output Comparator
RMS
R
at 500MHz and 90mV at 2MHz.
f
LE
C
f
SYMBOL
t
t
t
pd+
pd-
pw
t
50
t
pd+
pd-
t
t
h
50
s
(E)
(E)
(E)
-2V
T
T
T
T
T
T
T
T
T
T
T
T
A
A
A
A
A
A
A
A
A
A
A
A
= +25°C
= 0°C to +70°C
= -55°C to +125°C
= +25°C
= 0°C to +70°C
= -55°C to +125°C
= +25°C
= 0°C to +70°C
= -55°C to +125°C
= +25°C
= 0°C to +70°C
= -55°C to +125°C
Layout
CONDITIONS
ance applications, microstrip layout at the input may also
be helpful. Pay close attention to the bandwidth of the
decoupling and terminating components. Chip compo-
nents can be used to minimize lead inductance.
As with all high-speed comparators, the high gain-
bandwidth product of these devices creates oscillation
problems when the input traverses through the linear
region. For clean switching without oscillation or steps
in the output waveform, the input must meet certain
Figure 2. As a high-speed receiver, the MAX9687 is capable of
processing signals in excess of 600MHz. Figure 2 is a 100MHz
example with an input signal level of 14mV
OUTPUT
INPUT
MIN
3.0
MAX9687C/E
20mV/div
INPUT
TYP
1.4
1.6
1.4
1.6
1.3
1.4
1.4
1.6
2.0
0.5
0.5
Input Slew-Rate Requirement
MAX
1.9
2.2
1.9
2.2
1.8
2.0
1.8
1.9
1.0
1.0
500mV/div
OUTPUT
MIN
3.0
2ns/div
MAX9687M
RMS.
TYP
1.4
1.7
1.4
1.9
1.3
1.5
1.3
1.7
2.0
0.5
0.5
MAX
1.9
2.6
1.9
2.6
1.8
2.0
1.8
2.6
1.0
1.0
-1.7V
0V
-0.9V
UNITS
ns
ns
ns
ns
ns
3