_______________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 char- acteristics normally 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 50 terminated transmission lines. the ultra-fast operation makes signal processing possible at frequencies in excess of 600mhz. ________________________applications high-speed a/d converters high-speed line receivers peak detectors threshold detectors ____________________________features ? 1.3ns propagation delay ? +5v, -5.2v power supplies ? pin-compatible with cmp-08 ? available in commercial, extended-industrial, and military temperature ranges ? available in small-outline package ______________ordering information MAX9690 ultra-fast ecl-output comparator ________________________________________________________________ maxim integrated products 1 top view MAX9690
dip/so
1
2
3
4 8
7
6
5 gnd1
gnd2
q out
q out v+
in+ in-
v-
__________________pin configuration in+ r l r l in- v t q out q out the outputs are open emitters, requiring
external pull-down resistors. these resistors
may be within 50 w -200 w connected to -2.0v, or
240 w -2k w connected to -5.2v.
________________functional diagram 19-2401; rev 2; 8/96 for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 part temp. range pin-package* MAX9690cpa-4 0? to +70? 8 plastic dip MAX9690csa 0? to +70? 8 so MAX9690cja 0? to +70? 8 cerdip MAX9690epa -40? to +85? 8 plastic dip MAX9690esa -40? to +85? 8 so MAX9690mja-4 -55? to +125? 8 cerdip
MAX9690 ultra-fast ecl-output comparator 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v+ = +5v, v- = -5.2v, r l = 50 w , v t = -2v, t a = +25?, unless otherwise noted.) stresses beyond those listed under ?bsolute 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. common-mode rejection ratio cmrr db input voltage range v cm v input bias current i b ? input offset current i os ? power-supply rejection ratio psrr db input resistance r in k input capacitance c in pf v oh v input offset voltage v os mv temperature coefficient ? v os / ? t ?/? (note 1) (note 1) t a = +25? t a = +25? (note 1) t a = +25? t a = t min to t max (note 1) 80 -2.5 +2.5 10 20 5 60 60 3 -1.05 -0.87 -5 5 -7 7 10 parameter symbol units MAX9690c/e min typ max conditions 80 -2.5 +2.5 10 20 5 60 60 3 -1.16 -0.89 -5 5 -8 8 15 MAX9690m min typ max -0.88 -0.69 -0.89 -0.70 -0.96 -0.81 -0.96 -0.81 MAX9690c, MAX9690m positive supply current 16 22 ma 16 22 t a = +25? 25 24 t a = t min to t max logic output high voltage -0.88 -0.70 -0.96 -0.81 MAX9690e -1.14 -0.88 negative supply current 20 32 ma 20 32 t a = +25? 37 36 t a = t min to t max logic output low voltage -1.83 -1.57 -1.85 -1.65 MAX9690e -1.90 -1.65 v ol -1.82 -1.55 v -1.90 -1.65 -1.89 -1.65 -1.85 -1.65 -1.85 -1.65 MAX9690c, MAX9690m -1.83 -1.57 supply voltages.....................................................................?v input voltages........................................................................?v differential input voltages...................................................?.5v output current ....................................................................30ma continuous power dissipation (t a = +70?) plastic dip (derate 9.09mw/? above +70?)...........727mw so (derate 5.88mw/? above +70?) .......................471mw cerdip (derate 8.00mw/? above +70?) ...............640mw operating temperature ranges MAX9690c_ a ...................................................0? to +70? MAX9690e_ a ................................................-40? to +85? MAX9690mja ..............................................-55? to +125? storage temperature range .............................-55? to +150? lead temperature (soldering, 10sec) .............................+300? t a = t min to t max t a = t min to t max 8 30 12 40 t a = t min t a = t max t a = +25? t a = t min t a = t max t a = +25? t a = t min t a = t max t a = t min t a = t max t a = +25? t a = +25?
MAX9690 ultra-fast ecl-output comparator _______________________________________________________________________________________ 3 __________applications information layout because of the MAX9690? 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 50 w to 120 w . 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. 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 will increase the minimum slew-rate requirement. ____________________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?he voltage required between the input terminals to obtain 0v differ- ential at the output. v in input voltage pulse amplitude v od input voltage overdrive t pd+ input to output high delay?he 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. t pd- input to output low delay?he 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. switching characteristics (v+ = +5v, v- = -5.2v, r l = 50 w , v t = -2v, t a = +25?, unless otherwise noted.) note 1: not tested, guaranteed by design. note 2: v in = 100mv, v od = 10mv. parameter symbol MAX9690c/e min typ max MAX9690m min typ max units 1.3 1.8 1.3 1.8 1.5 2.0 input to output high (notes 1, 2) t pd+ 1.7 2.4 ns 1.3 1.8 1.3 1.8 1.5 2.0 conditions t a = +25? t a = 0? to +70? t a = -55? to +125? t a = +25? t a = 0? to +70? input to output low (notes 1, 2) t pd- 1.7 2.4 ns t a = -55? to +125?
MAX9690 ultra-fast ecl-output comparator 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. 4 ___________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 1996 maxim integrated products printed usa is a registered trademark of maxim integrated products. differential
input
voltage q q v od v in v os 50% 50% t pd figure 1. timing diagram
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