MAX9687MJE 查看數據表（PDF） - Maxim Integrated
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MAX9687MJE Datasheet PDF : 4 Pages
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Dual, Ultra-Fast ECL-Output Comparator
SWITCHING CHARACTERISTICS
(VS = ±5V, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Input to Output High
(Notes 2, 3)
tpd+
Input to Output Low
(Notes 2, 3)
tpd-
Latch-Enable to Output High
(Notes 2, 3)
tpd+(E)
Latch-Enable to Output Low
(Notes 2, 3)
tpd-(E)
Latch-Enable Pulse Width (Note 2)
Minimum Setup Time
Minimum Hold Time
tpw(E)
ts
th
Note 2: Not tested, guaranteed by design.
Note 3: VIN = 100mV, VOD = 10mV.
TA = +25°C
TA = 0°C to +70°C
TA = -55°C to +125°C
TA = +25°C
TA = 0°C to +70°C
TA = -55°C to +125°C
TA = +25°C
TA = 0°C to +70°C
TA = -55°C to +125°C
TA = +25°C
TA = 0°C to +70°C
TA = -55°C to +125°C
MAX9687C/E
MIN TYP MAX
1.4 1.9
1.6 2.2
1.4 1.9
1.6 2.2
1.3 1.8
1.4 2.0
1.4 1.8
1.6 1.9
3.0 2.0
0.5 1.0
0.5 1.0
MAX9687M
MIN TYP MAX
UNITS
1.4 1.9
ns
1.7 2.6
1.4 1.9
ns
1.9 2.6
1.3 1.8
ns
1.5 2.0
1.3 1.8
ns
1.7 2.6
3.0 2.0
0.5 1.0 ns
0.5 1.0
50Ω
VIN
LE
50Ω
-2V
50Ω
Rf
Cf
50Ω
INPUT
20mV/div
OUTPUT
500mV/div 2ns/div
INPUT
0V
OUTPUT
-0.9V
Figure 1. High-speed receiver application with 50Ω 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 360mVRMS at 500MHz and 90mV at 2MHz.
Slew Rate
E RMS =
2 2 πf
__________Applications Information
Layout
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 50Ω to 120Ω. For low-imped-
-1.7V
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 14mVRMS.
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.
Input Slew-Rate Requirement
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
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