AD96685BR ,Ultrafast ComparatorsFEATURES AD96685 FUNCTIONAL BLOCK DIAGRAMFast: 2.5 ns Propagation DelayLow Power: 118 mW per Compar ..
AD96685TQ ,Ultrafast ComparatorsCHARACTERISTICS4Input Offset Voltage +25°CI 1 2 12 12 12 mVFull VI 3333mVInput Offset Drift Full V ..
AD96687BP ,Ultrafast ComparatorsGENERAL DESCRIPTION families. The outputs provide sufficient drive current to directlyThe AD96685 a ..
AD96687BQ ,Ultrafast ComparatorsGENERAL DESCRIPTION families. The outputs provide sufficient drive current to directlyThe AD96685 a ..
AD96687BR ,Ultrafast ComparatorsSPECIFICATIONS1ABSOLUTE MAXIMUM RATINGS EXPLANATION OF TEST LEVELSTest LevelPositive Supply Voltage ..
AD96687BR-REEL ,Ultrafast ComparatorsSPECIFICATIONS1ABSOLUTE MAXIMUM RATINGS EXPLANATION OF TEST LEVELSTest LevelPositive Supply Voltage ..
ADS821U ,SpeedPlus 10-Bit, 40MHz Sampling Analog-to-Digital ConverterPIN CONFIGURATION PIN DESCRIPTIONSPIN DESIGNATOR DESCRIPTIONTop View SO1 GND Ground2 B1 Bit 1, Most ..
ADS821UG4 ,10-Bit, 40 MSPS ADC SE/Diff Inputs with Int References and 9.3 bit ENOB 28-SOIC -40 to 85MAXIMUM RATINGSELECTROSTATIC+V .... +6VSDISCHARGE SENSITIVITYAnalog Input ...... 0V to (+V + 300mV) ..
ADS822 ,10-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTERS(1)ABSOLUTE
ADS822E ,10-Bit/ 40MHz Sampling ANALOG-TO-DIGITAL CONVERTERSFEATURES* POWER DOWN: 20mW* HIGH SNR: 60dB* SSOP-28 PACKAGE* HIGH SFDR: 72dBFS* LOW POWER: 190mWAPP ..
ADS822E/1KG4 ,10-Bit, 40 MSPS ADC SE/Diff Inputs, Int/Ext References w/Powerdown, pin compatible to ADS823/6/8 28-SSOP -40 to 85Maximum Ratings” and installation procedures can cause damage.may cause permanent damage to the dev ..
ADS822EG4 ,10-Bit, 40 MSPS ADC SE/Diff Inputs, Int/Ext References w/Powerdown, pin compatible to ADS823/6/8 28-SSOP -40 to 85MAXIMUM RATINGSELECTROSTATIC+V .... +6VSDISCHARGE SENSITIVITYAnalog Input ....... –0.3V to (+V + 0. ..
AD96685BH-AD96685BP-AD96685BQ-AD96685BR-AD96685TQ-AD96687BP-AD96687BQ-AD96687BR-AD96687BR-REEL-AD96687TQ
Ultrafast Comparators
REV.C
Ultrafast Comparators
AD96685 FUNCTIONAL BLOCK DIAGRAM
AD96687 FUNCTIONAL BLOCK DIAGRAM
FEATURES
Fast: 2.5 ns Propagation Delay
Low Power: 118 mW per Comparator
Packages: DIP, TO-100, SOIC, PLCC
Power Supplies: +5 V, –5.2 V
Logic Compatibility: ECL
MIL-STD-883 Versions Available
50 ps Delay Dispersion
APPLICATIONS
High Speed Triggers
High Speed Line Receivers
Threshold Detectors
Window Comparators
Peak Detectors
GENERAL DESCRIPTIONThe AD96685 and AD96687 are ultrafast voltage comparators.
The AD96685 is a single comparator with 2.5 ns propagation
delay; the AD96687 is an equally fast dual comparator. Both
devices feature 50 ps propagation delay dispersion which is a
particularly important characteristic of high speed comparators.
It is a measure of the difference in propagation delay under dif-
fering overdrive conditions.
A fast, high precision differential input stage permits consistent
propagation delay with a wide variety of signals in the common-
mode range from –2.5 V to +5 V. Outputs are complementary
digital signals fully compatible with ECL 10 K and 10 KH logic
families. The outputs provide sufficient drive current to directly
drive transmission lines terminated in 50 Ω to –2 V. A level sen-
sitive latch input is included which permits tracking, track-hold,
or sample-hold modes of operation.
The AD96685 and AD96687 are available in both industrial,
–25°C to +85°C, and military temperature ranges. Industrial
range devices are available in 16-pin DIP, SOIC, and 20-lead
PLCC; additionally, the AD96685 is available in a 10-pin,
TO-100 metal can.
AD96685/AD96687–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (Positive Supply Voltage = +5.0 V; Negative Supply Voltage = –5.2 V, unless otherwise noted)NOTESAbsolute maximum ratings are limiting values, may be applied individually, and beyond which serviceability
of the circuit may be impaired. Functional operation under any of these conditions is not necessarily implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2Under no circumstances should the input voltages exceed the supply voltages .Typical thermal impedances . . .
AD96685 Metal CanθJA = 172°C/W; θJC = 52°C/W
AD96685 CeramicθJA = 115°C/W; θJC = 57°C/W
AD96685 SOICθJA = 170°C/W; θJC = 60°C/W
ABSOLUTE MAXIMUM RATINGS1Positive Supply Voltage (+VS) . . . . . . . . . . . . . . . . . . . .+6.5 V
Negative Supply Voltage (–VS) . . . . . . . . . . . . . . . . . . .–6.5 V
Input Voltage Range2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .±5 V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . .5.5 V
Latch Enable Voltage . . . . . . . . . . . . . . . . . . . . . . . .–VS to 0 V
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 mA
Operating Temperature Range3
AD96685/87/BH/BQ/BP/BR . . . . . . . . . . . .–25°C to +85°C
AD96685/87/TQ . . . . . . . . . . . . . . . . . . . .–55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . .–55°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . .+175°C
Lead Soldering Temperature (10 sec) . . . . . . . . . . . . .+300°C
EXPLANATION OF TEST LEVELSTest Level–100% production tested.–100% production tested at +25°C, and sample tested at
specified temperatures.
III–Sample tested only.–Parameter is guaranteed by design and characterization
testing.–Parameter is a typical value only.–All devices are 100% production tested at +25°C; 100%
production tested at temperature extremes for extended
temperature devices; sample tested at temperature ex-
tremes for commercial/industrial devices.RS = 100 Ω.
5Input Voltage Range can be extended to –3.3 V if –VS = –6.0 V.Outputs terminated through 50 Ω to –2.0 V.
7Propagation delays measured with 100 mV pulse (10 mV overdrive), to
50% transition point of the output.
8Change in propagation Delay from 100 mV to 1 V input overdrive.Supply voltages should remain stable within ±5% for normal operation.
10Measured at ±5% of +VS and –VS.
Specifications subject to change without notice.
FUNCTIONAL DESCRIPTION
PIN DESIGNATIONS
AD96685BQ/TQ/BRAD96687BQ/TQ/BR
AD96685BPAD96685BHAD96687BP
NC = NO CONNECT
AD96685/AD96687
SYSTEM TIMING DIAGRAM–Minimum Setup Time–Minimum Hold Time
tPD–Input to Output Delay
tPD(E)–LATCH ENABLE to Output Delay
tPW(E)–Minimum LATCH ENABLE Pulse Width
VOS–Input Offset Voltage
VOD–Overdrive Voltage
DIE LAYOUT AND MECHANICAL INFORMATIONDie Dimensions (AD96687) . . . . . . . .77 3 60 3 15 (±2) mils
Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3 4 mils
Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Aluminum
Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .None
Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–VS
Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oxynitride
Die Attach . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Gold Eutectic
Bond Wire . . . . . . . .1.25 mil, Aluminum; Ultrasonic Bonding
or 1 mil, Gold, Gold Ball Bonding
Die Dimensions (AD96685) . . . . . . . .44 3 50 3 15 (±2) mils
Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3 4 mils
Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Aluminum
Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .None
Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–VS
Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oxynitride
Die Attach . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Gold Eutectic
Bond Wire . . . . . . . .1.25 mil, Aluminum; Ultrasonic Bonding
or 1 mil, Gold, Gold Ball Bonding
APPLICATIONS INFORMATIONThe AD96685/87 comparators are very high speed devices.
Consequently, high speed design techniques must be employed
to achieve the best performance. The most critical aspect of any
AD96685/87 design is the use of a low impedance ground
plane.
Another area of particular importance is power supply
decoupling. Normally, both power supply connections should
be separately decoupled to ground through 0.1 μF ceramic and
0.001 μF mica capacitors. The basic design of comparator cir-
cuits makes the negative supply somewhat more sensitive to
variations. As a result more attention should be placed on insur-
ing a “clean” negative supply.
The LATCH ENABLE input is active LOW (latched). If the
latching function is not used, the LATCH ENABLE input
should be grounded (ground is an ECL logic HIGH). The
LATCH ENABLE input of the AD96687 should be tied to
–2.0 V or left “floating,” to disable the latching function. An
alternate use of the LATCH ENABLE input is as a hysteresis
control input. By varying the voltage at the LATCH ENABLE
input for the AD96685 and the differential voltage between both
latch inputs for the AD96687, small variations in the hysteresis
can be achieved.
Occasionally, one of the two comparator stages within the
AD96687 will not be used. The inputs of the unused compara-
tor should not be allowed to “float.” The high internal gain may
cause the output to oscillate (possibly affecting the other com-
parator which is being used) unless the output is forced into a
fixed state. This is easily accomplished by insuring that the two
inputs are at least one diode drop apart, while also grounding
the LATCH ENABLE input.
The best performance will be achieved with the use of proper
ECL terminations. The open-emitter outputs of the
AD96685/87 are designed to be terminated through 50 Ω resis-
tors to –2.0 V, or any other equivalent ECL termination. If high
speed ECL signals must be routed more than a few centimeters,
MicroStrip or StripLine techniques may be required to insure
proper transition times and prevent output ringing.
The AD96685/87 have been specifically designed to reduce
propagation delay dispersion over an input overdrive range of
100 mV to 1 V. Propagation delay dispersion is the change in
propagation delay which results from a change in the degree of
overdrive (how far the switching point is exceeded by the input).
The overall result is a higher degree of timing accuracy since the
AD96685/87 is far less sensitive to input variations than most
comparator designs.
Typical Applications
HIGH SPEED SAMPLING CIRCUIT
HIGH SPEED WINDOW COMPARATOR
ORDERING GUIDE
AD96685/AD96687
OUTLINE DIMENSIONSDimensions shown in inches and (mm).
C1096b–2–9/96
PRINTED IN U.S.A.
16-Pin Ceramic DIP
20-Pin LCC
16-Pin SOIC
20-Pin PLCC
10-Pin TO-100 Metal Can
