VV
VV
Voltaolta
oltaolta
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gg
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
1
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
GENERAL DESCRIPTION
The AS111 is a voltage comparator that has input currents
nearly a thousand times lower than other similar devices like. It
is also designed to operate over a wider range of supply
voltages: from standard ±15V op amp supplies down to the
single 5V supply used for IC logic. Their output is compatible
with R TL, DTL and TTL as well as MOS circuits. Further , they
can drive lamps or relays, switching voltages up to 50V at
currents as high as 50 mA.
Both the inputs and the outputs of the AS111 can be
isolated from system ground, and the output can drive loads
referred to ground, the positive supply or the negative supply.
Offset balancing and strobe capability are provided and
outputs can be wire OR’ed. Although slower than some
devices (200 ns response time vs 40 ns), this device is also
much less prone to spurious oscillations.
FEATURES
• Operates from single 5V supply
• Input current: 150 nA max. over temperature
• Offset current: 20 nA max. over temperature
• Differential input voltage range: ±30V
• Power consumption: 135 mW at ±15V
OPTIONS MARKINGS
• Packages
8 pin Ceramic DIP C008
14 pin Ceramic DIP C014
20 pin Ceramic LCC E020
8 Lead Metal Can TO08
• T emperature Ranges
Extended (-55oC to +125oC) XT
MIL-STD-883 paragraph 1.2.1
(-55oC to +125oC) /883
AVAILABLE AS MILITARY
SPECIFICATIONS
• SMD 5962-86877
• M38510/10304B
• MIL-STD-883, 1.2.1
V oltage Comparator
For more products and information
please visit our web site at
www.austinsemiconductor.com
PIN ASSIGNMENT
(Top View)
1
2
3
4
8
7
6
5
GND
INPUT+
INPUT-
V-
V+
OUTPUT
BALANCE/
STROBE
BALANCE
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
GND
INPUT+
INPUT-
NC
V-
BALANCE
NC
NC
NC
V+
NC
OUTPUT
BALANCE/
STROBE
8 Pin Ceramic DIP (C008)
14 Pin Ceramic DIP (C014)
8 Lead Metal Can (TO08)
20 Pin Ceramic LCC (E020)
V+
GND
INPUT+
INPUT- BALANCE
V-
BALANCE/STROBE
OUTPUT
1
2
3
45
6
7
8
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
2
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL APPLICATIONS3
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
3
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL APPLICATIONS (CONTINUED)3
NOTE: Do Not Ground Strobe Pin
NOTE 2: Typical input current is 50pV with inputs strobed off.
NOTE 3: Pin connections shown on schematic diagram and typical applications are for TO08 metal can package.
*Stresses greater than those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
these or any other conditions above those indicated in the
operation section of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods
may affect reliability .
ABSOLUTE MAXIMUM RATINGS*,5
T otal Supply Voltage (V84).............................................................36V
Output to Negative Supply Voltage (V74)....................................50V
Ground to Negative Supply Voltage (V14)...................................30V
Differential Input V oltage.............................................................±30V
Input V oltage4................................................................................±15V
Output Short Circuit Duration..................................................10 sec
Lead T emperature (Soldering, 10 sec).......................................260°C
Voltage at Stobe Pin................................................................V+ -5V
Note 4: This rating applies for ±15 supplies. The positive input voltage limit is 30V above the negative supply. The negative input voltage limit
is equal to the negative supply voltage or 30V below the positive supply, whichever is less.
Note 5: The maximum junction temperature of the AS111 is 150°C. For operating at elevated temperatures, devices in the TO08 package must
be derated based on a thermal resistance of 165°C/W, junction to ambient, or 20°C/W, junction to case. The thermal resistance of the dual-in-line
package is 110°C/W, junction to ambient.
VV
VV
Voltaolta
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oltagg
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gee
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
4
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
ELECTRICAL CHARACTERISTICS6
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Offset Voltage7TA = 25°C, RS < 50K 0.7 3.0 mV
Input Offset Current TA = 25°C 4.0 10 nA
Input Bias Current TA = 25°C 60 100 nA
Voltage Gain TA = 25°C 40 200 V/mV
Response Time8TA = 25°C 200 ns
Saturation Voltage VIN < -5mV, IOUT = 50mA, TA = 25°C 0.75 1.5 V
Strobe ON Current9TA = 25°C 2.0 5.0 mA
Output Leakage Current VIN > 5mV, IOUT = 35V, TA = 25°C, ISTROBE = 3mA 0.2 10 nA
Input Offset Voltage7RS < 50k 4.0 mV
Input Offset Current720 nA
Input Bias Current 150 nA
Input Voltage Range V+ = 15V, V- = -15V, Pin 7 Pull-Up May Go To 5V -14.5 13.8, -14.7 13.0 V
Saturation Voltage V+ > 4.5V, V- = 0, VIN < -6mV, IOUT < 8mA 0.23 0.4 V
Output Leakage Current VIN > 5mV, IOUT = 35V 0.1 0.5 µA
Positive Supply Current TA = 25°C 5.1 6.0 mA
Negative Supply Current TA = 25°C 4.1 5.0 mA
Note 6: These specifications apply for VS=±15V and Ground pin at ground, and -55°C < TA < +125°C, unless otherwise stated.
The offset voltage, offset current and bias current specifications apply for any supply voltage from a single 5V supply up to
±15V supplies.
Note 7: The offset voltages and offset currents given are the maximum values required to drive the output within a volt of
either supply with a 1mA load. Thus, these parameters define an error band and take into account the worst-case effects of
voltage gain and RS.
Note 8: The response time specified (see definitions) is for a 100 mV input step with 5 mV overdrive.
Note 9: This specification gives the range of current which must be drawn from the strobe pin to ensure the output is properly
disabled. Do not short the strobe pin to ground; it should be current driven at 3 to 5 mA.
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
5
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
6
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
VV
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Voltaolta
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
7
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
CIRCUIT TECHNIQUES FOR AVOIDING
OSCILLATIONS IN COMPARATOR
APPLICATIONS
When a high-speed comparator such as the AS111 is used
with fast input signals and low source impedances, the output
response will normally be fast and stable, assuming that the
power supplies have been bypassed (with 0.1 µF
disccapacitors), and that the output signal is routed well away
from the inputs (pins 2 and 3) and also away from pins 5 and 6.
However , when the input signal is a voltage ramp or a slow
sine wave, or if the signal source impedance is high (1 kW to
100 kW), the comparator may burst into oscillation near the
crossing-point. This is due to the high gain and wide
bandwidth of comparators like the AS1 1 1. T o avoid oscillation
or instability in such a usage, several precautions are recom
mended, as shown in Figure 1 below .
1. The trim pins (pins 5 and 6) act as unwanted auxiliary
inputs. If these pins are not connected to a trim-pot, they
should be shorted together . If they are connected to a trim-
pot, a 0.01 µF capacitor C1 between pins 5 and 6 will
minimize the susceptibility to AC coupling. A smaller
capacitor is used if pin 5 is used for positive feedback as in
Figure 1.
2. Certain sources will produce a cleaner comparator
out put waveform if a 100 pF to 1000 pF capacitor C2 is
connected directly across the input pins.
3. When the signal source is applied through a resistive
network, RS, it is usually advantageous to choose an RS’ of
substantially the same value, both for DC and for dynamic
(AC) considerations. Carbon, tin-oxide, and metal-film
resistors have all been used successfully in comparator
input circuitry. Inductive wirewound resistors are not
suitable.
(continued)
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
8
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
APPLICATION HINTS (CONTINUED)
4. When comparator circuits use input resistors (eg.
summing resistors), their value and placement are
particularly important. In all cases the body of the resistor
should be close to the device or socket. In other words
there should be very little lead length or printed-circuit foil
run between comparator and resistor to radiate or pick up
signals. The same applies to capacitors, pots, etc. For
example, if RS=10 kW, as little as 5 inches of lead between
the resistors and the input pins can result placing resistors
close to the comparator.
5. Since feedback to almost any pin of a comparator can
result in oscillation, the printed-circuit layout should be
engineered thoughtfully. Preferably there should be a
groundplane under the AS111 circuitry, for example, one
side of a double-layer circuit card. Ground foil (or, positive
supply or negative supply foil) should extend between the
output and the inputs, to act as a guard. The foil
connections for the inputs should be as small and compact
as possible, and should be essentially surrounded by
ground foil on all sides, to guard against capacitive
coupling from any high-level signals (such as the output).
If pins 5 and 6 are not used, they should be shorted
together. If they are connected to a trim-pot, the trim-pot
should be located, at most, a few inches away from the
AS111, and the 0.01 µF capacitor should be installed. If
this capacitor cannot be used, a shielding printed-circuit
foil may be advisable between pins 6 and 7. The power
supply bypass capacitors should be located within a couple
inches of the AS111. (Some other comparators require the
power-supply bypass to be located immediately adjacent
to the comparator .)
6. It is a standard procedure to use hysteresis (positive
feedback) around a comparator , to prevent oscillation, and
to avoid excessive noise on the output because the
comparator is a good amplifier for its own noise. In the
circuit of Figure 2, the feedback from the output to the
positive input will cause about 3 mV of hysteresis.
However, if RS is larger than 100Ω, such as 50 kΩ, it would
not be reasonable to simply increase the value of the
positive feedback resistor above 510 kΩ. The circuit of
Figure 3 could be used, but it is rather awkward. See the
notes in paragraph 7 below.
7. When both inputs of the AS111 are connected to active
signals, or if a high-impedance signal is driving the
positive input of the AS111 so that positive feedback would
be disruptive, the circuit of Figure 1 is ideal. The positive
feedback is to pin 5 (one of the offset adjustment pins). It is
sufficient to cause 1 to 2 mV hysteresis and sharp
transitions with input triangle waves from a few Hz to
hundreds of kHz. The positive-feedback signal across the
82Ω resistor swings 240 mV below the positive supply.
This signal is centered around the nominal voltage at pin 5,
so this feedback does not add to the VOS of the
comparator . As much as 8 mV of VOS can be trimmed out,
using the 5 kΩ pot and 3 kΩ resistor as shown.
8. These application notes apply specifically to the AS111
family of comparators, and are applicable to all high-speed
comparators in general, (with the exception that not all
comparators have trim pins).
NOTE: Pin connections shown are for the TO08 can package.
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
9
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
APPLICATION HINTS (CONTINUED)
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can p ackage)
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
10
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
10Hz to 10kHz Voltage Controlled Oscillator
VV
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
11
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
VV
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
12
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
VV
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
13
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
VV
VV
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
14
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
VV
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
15
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
SCHEMATIC DIAGRAM20
NOTE 20: Pin connections shown on schematic diagram are for the TO08 can package.
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
16
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
ASI Case (Package Designator C008)
SMD 5962-86877, Case Outline P
MECHANICAL DEFINITIONS*
*All measurements are in inches.
MIN MAX
A --- 0.200
b 0.014 0.026
b2 0.045 0.065
c 0.008 0.018
D --- 0.405
E 0.220 0.310
e
eA
L 0.125 0.200
Q 0.015 0.060
S1 0.005 ---
S2 0.005 ---
SYMBOL ASI SPECIFICATIONS
0.100 BCS
0.300 BSC
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
17
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
ASI Case (Package Designator C014)
M38510/10304B, Case Outline C
MECHANICAL DEFINITIONS*
*All measurements are in inches.
MIN MAX
A --- 0.200
b 0.014 0.026
b2 0.045 0.065
c 0.008 0.018
D --- 0.785
E 0.220 0.310
e
eA
L 0.125 0.200
Q 0.015 0.060
S1 0.005 ---
S2 0.005 ---
SYMBOL ASI SPECIFICATIONS
0.100 BCS
0.300 BSC
VV
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
18
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
ASI Case (Package Designator E020)
SMD 5962-86877, Case Outline 2
MECHANICAL DEFINITIONS*
*All measurements are in inches.
E2
L1
B1
D2
L
e
E
D1
E1
D
A
A1
MIN MAX
A 0.060 0.100
A1 0.050 0.088
B1 0.022 0.028
D/E 0.342 0.358
D1/E1 --- 0.358
D2/E2
e
L 0.045 0.055
L1 0.075 0.095
0.050 BSC
SYMBOL ASI SPECIFICATIONS
0.200 BSC
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
19
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
ASI Case (Package Designator TO08)
SMD 5962-86877, Case Outline G
MECHANICAL DEFINITIONS*
*All measurements are in inches.
MIN MAX
A 0.165 0.185
b 0.016 0.019
b1 0.016 0.021
b2 0.016 0.024
D 0.335 0.375
D1 0.305 0.335
D2 0.110 0.160
e
e1
F --- 0.040
k 0.027 0.034
k1 0.027 0.045
L 0.500 0.750
L1 --- 0.050
L2 0.250 ---
Q 0.010 0.045
α
β
0.200 BSC
0.100 BSC
45° BSC
45° BSC
SYMBOL ASI SPECIFICATIONS
VV
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ComparatorComparator
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AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
20
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
*AVAILABLE PROCESSES:
XT = Extended Temperature Range -55oC to +125oC
/883C = MIL-STD-883 paragraph 1.2.1 -55oC to +125oC
ORDERING INFORMA TION
EXAMPLE: AS111C008/883C
Device Number Package Type Process
AS111 C008 /*
EXAMPLE: AS111C014/XT
Device Number Package Type Process
AS111 C014 /*
EXAMPLE: AS111E020/XT
Device Number Package Type Process
AS111 E020 /*
EXAMPLE: AS111TO08/883C
Device Number Package Type Process
AS111 TO08 /*
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ComparatorComparator
ComparatorComparator
Comparator
AS111
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
21
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc.
ASI TO DSCC PART NUMBER
CROSS REFERENCE
* ASI part number is for reference only. Orders received referencing the SMD part number will be processed per the SMD.
ASI PART NUMBER DSCC PART NUMBER
AS111C008/883C 5962-8687701PA
AS111E020/883C 5926-86877012A
AS111TO08/883C 5962-8687701GA
AS111C008/883C M38510/10304BPA
AS111E020/883C M38510/10304B2A
AS111TO08/883C M38510/10304BGA
AS111C014/883C M38510/10304BCA
