19-2401; Rev 3; 3/97
Ultra-Fast ECL-Output Comparator
_______________General Description
The MAX9690 is an ultra-fast ECL comparator manufac-
tured with a high-frequency bipolar process (f
T
= 6GHz)
capable of very short propagation delays. This design
maintains the excellent DC matching characteristics nor-
mally found only in slower comparators. The MAX9690 is
similar in function to the MAX9685, except the latch-
enable input is eliminated.
The MAX9690 is pin-compatible with the CMP-08 but
exceeds the AC characteristics of that device.
The MAX9690 has differential inputs and complemen-
tary outputs that are fully compatible with ECL-logic lev-
els. Output current levels are capable of driving 50Ω
terminated transmission lines. The ultra-fast operation
makes signal processing possible at frequencies in
excess of 600MHz.
____________________________Features
o
1.3ns Propagation Delay
o
+5V, -5.2V Power Supplies
o
Pin-Compatible with CMP-08
o
Available in Commercial, Extended-Industrial,
and Military Temperature Ranges
o
Available in Small-Outline Package
MAX9690
______________Ordering Information
PART
MAX9690CPA-4
MAX9690CSA
MAX9690CJA
MAX9690EPA
MAX9690ESA
MAX9690MJA-4
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 CERDIP
8 Plastic DIP
8 SO
8 CERDIP
________________________Applications
High-Speed A/D Converters
High-Speed Line Receivers
Peak Detectors
Threshold Detectors
________________Functional Diagram
__________________Pin Configuration
TOP VIEW
IN+
Q OUT
IN-
R
L
R
L
Q OUT
V+ 1
IN+ 2
IN- 3
MAX9690
8
7
6
5
GND1
GND2
Q OUT
Q OUT
V
T
V- 4
DIP/SO
THE OUTPUTS ARE OPEN EMITTERS, REQUIRING
EXTERNAL PULL-DOWN RESISTORS. THESE RESISTORS
MAY BE WITHIN 50Ω–200Ω CONNECTED TO -2.0V, OR
240Ω–2kΩ CONNECTED TO -5.2V.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Ultra-Fast ECL-Output Comparator
MAX9690
ABSOLUTE MAXIMUM RATINGS
Supply Voltages.....................................................................±6V
Input Voltages........................................................................±5V
Differential Input Voltages...................................................±3.5V
Output Current ....................................................................30mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C)...........727mW
SO (derate 5.88mW/°C above +70°C) .......................471mW
CERDIP (derate 8.00mW/°C above +70°C) ...............640mW
Operating Temperature Ranges
MAX9690C_ A ...................................................0°C to +70°C
MAX9690E_ A ................................................-40°C to +85°C
MAX9690MJA ..............................................-55°C to +125°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = +5V, V- = -5.2V, R
L
= 50Ω, V
T
= -2V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage
Temperature Coefficient
Input Offset Current
Input Bias Current
Input Voltage Range
Common-Mode
Rejection Ratio
Power-Supply
Rejection Ratio
Input Resistance
Input Capacitance
SYMBOL
V
OS
∆V
OS
/∆T
I
OS
I
B
V
CM
CMRR
PSRR
R
IN
C
IN
(Note 1)
T
A
= T
MIN
T
A
= T
MAX
T
A
= +25°C
T
A
= T
MIN
MAX9690E
T
A
= T
MAX
T
A
= +25°C
MAX9690C,
MAX9690M
Logic Output
Low Voltage
V
OL
MAX9690E
Positive Supply
Current
Negative Supply
Current
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
20
T
A
= T
MIN
T
A
= T
MAX
T
A
= +25°C
T
A
= T
MIN
T
A
= T
MAX
T
A
= +25°C
60
3
-1.05
-0.89
-0.96
-1.14
-0.88
-0.96
-1.83
-1.89
-1.85
-1.90
-1.83
-1.85
16
-0.87
-0.70
-0.81
-0.88
-0.70
-0.81
-1.57
-1.65
-1.65
-1.65
-1.57
-1.65
22
24
32
36
20
16
22
25
32
37
mA
mA
-1.82
-1.90
-1.85
-1.55
-1.65
-1.65
V
-1.16
-0.88
-0.96
MAX9690C,
MAX9690M
Logic Output
High Voltage
V
OH
CONDITIONS
T
A
= +25°C
T
A
= T
MIN
to T
MAX
(Note 1)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
(Note 1)
(Note 1)
MAX9690C/E
MIN
TYP MAX
-5
5
-7
7
10
5
8
10
20
30
-2.5
+2.5
80
60
60
3
-0.89
-0.69
-0.81
V
MAX9690M
MIN
TYP MAX
-5
5
-8
8
15
5
12
10
20
40
-2.5
+2.5
80
60
UNITS
mV
µV/°C
µA
µA
V
dB
dB
kΩ
pF
2
_______________________________________________________________________________________
Ultra-Fast ECL-Output Comparator
SWITCHING CHARACTERISTICS
(V+ = +5V, V- = -5.2V, R
L
= 50Ω, V
T
= -2V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Input to Output High
(Notes 1, 2)
Input to Output Low
(Notes 1, 2)
SYMBOL
CONDITIONS
T
A
= +25°C
t
pd+
T
A
= 0°C to +70°C
T
A
= -55°C to +125°C
T
A
= +25°C
t
pd-
T
A
= 0°C to +70°C
T
A
= -55°C to +125°C
Note 1:
Not tested, guaranteed by design.
Note 2:
V
IN
= 100mV, V
OD
= 10mV.
1.3
1.5
1.8
2.0
1.7
2.4
MAX9690C/E
MIN
TYP MAX
1.3
1.5
1.8
2.0
1.7
1.3
2.4
1.8
ns
MAX9690M
MIN
TYP MAX
1.3
1.8
ns
UNITS
MAX9690
__________Applications Information
Layout
Because of the MAX9690’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 capac-
itors 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-
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.
____________________Timing Diagram
The timing diagram illustrates the series of events that
completes the compare function, under worst-case
conditions. The leading edge of the input signal (illus-
trated as a large-amplitude, small-overdrive pulse)
–
–
switches the comparator. Outputs Q and Q are similar
in timing.
Definition of Terms
V
OS
Input Offset Voltage—The voltage required
between the input terminals to obtain 0V differ-
ential at the output.
Input Voltage Pulse Amplitude
Input Voltage Overdrive
Input to Output High Delay—The propagation
delay measured from the time the input signal
crosses the input offset voltage to the 50% point
of an output low-to-high transition.
Input to Output Low Delay—The propagation
delay measured from the time the input signal
crosses the input offset voltage to the 50% point
of an output high-to-low transition.
Input Slew-Rate Requirements
As with all high-speed comparators, the high gain-band-
width product of these devices creates oscillation prob-
lems when the input traverses through the linear region.
For clean switching without oscillation or steps in the out-
put waveform, the input must meet certain minimum slew-
rate requirements. The tendency of the part to oscillate is
a function of the layout and source impedance of the cir-
cuit employed. Both poor layout and larger source imped-
ance increase the minimum slew-rate requirement.
V
IN
V
OD
t
pd+
t
pd-
_______________________________________________________________________________________
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Ultra-Fast ECL-Output Comparator
MAX9690
DIFFERENTIAL
INPUT
VOLTAGE
V
IN
V
OS
V
OD
t
pd
Q
50%
Q
50%
Figure 1. Timing Diagram
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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