Austin AS111TO08/XT Voltage comparator Datasheet

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Austin Semiconductor, Inc.
Voltage Comparator
AS111
PIN ASSIGNMENT
(Top View)
AVAILABLE AS MILITARY
SPECIFICATIONS
8 Pin Ceramic DIP (C008)
• SMD 5962-86877
• M38510/10304B
• MIL-STD-883, 1.2.1
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
• Packages
8 pin Ceramic DIP
14 pin Ceramic DIP
20 pin Ceramic LCC
8 Lead Metal Can
• Temperature Ranges
Extended (-55oC to +125oC)
MIL-STD-883 paragraph 1.2.1
(-55oC to +125oC)
GND
1
8
V+
INPUT+
2
7
OUTPUT
INPUT-
3
6
BALANCE/
STROBE
V-
4
5
BALANCE
14 Pin Ceramic DIP (C014)
MARKINGS
C008
C014
E020
TO08
NC
1
14
NC
GND
2
13
NC
INPUT+
3
12
NC
INPUT-
4
11
V+
NC
5
10
NC
V-
6
9
OUTPUT
BALANCE
7
8
BALANCE/
STROBE
8 Lead Metal Can (TO08)
XT
V+
/883
8
GND 1
INPUT+
INPUT-
GENERAL DESCRIPTION
7
2
OUTPUT
6
3
5
4
BALANCE/STROBE
BALANCE
V-
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 RTL, 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.
20 Pin Ceramic LCC (E020)
For more products and information
please visit our web site at
www.austinsemiconductor.com
AS111
Rev. 1.6 6/05
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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AS111
TYPICAL APPLICATIONS3
AS111
Rev. 1.6 6/05
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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.
ABSOLUTE MAXIMUM RATINGS*,5
*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.
Total Supply Voltage (V84).............................................................36V
Output to Negative Supply Voltage (V74)....................................50V
Ground to Negative Supply Voltage (V14)...................................30V
Differential Input Voltage.............................................................±30V
Input Voltage4................................................................................±15V
Output Short Circuit Duration..................................................10 sec
Lead Temperature (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.
AS111
Rev. 1.6 6/05
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AS111
ELECTRICAL CHARACTERISTICS6
CONDITIONS
PARAMETER
TYP
MAX
UNITS
TA = 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
Input Offset Voltage
7
MIN
200
V/mV
TA = 25°C
200
ns
VIN < -5mV, IOUT = 50mA, TA = 25°C
0.75
1.5
V
TA = 25°C
2.0
5.0
mA
0.2
10
nA
RS < 50k
4.0
mV
V+ = 15V, V- = -15V, Pin 7 Pull-Up May Go To 5V
13.8, -14.7
20
150
13.0
nA
nA
V
0.23
0.4
V
0.1
0.5
µA
TA = 25°C
5.1
6.0
mA
Negative Supply Current TA = 25°C
4.1
5.0
mA
Response Time
8
Saturation Voltage
Strobe ON Current
9
40
Output Leakage Current VIN > 5mV, IOUT = 35V, TA = 25°C, ISTROBE = 3mA
Input Offset Voltage
7
7
Input Offset Current
Input Bias Current
Input Voltage Range
Saturation Voltage
+
-
V > 4.5V, V = 0, VIN < -6mV, IOUT < 8mA
Output Leakage Current VIN > 5mV, IOUT = 35V
Positive Supply Current
-14.5
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.
AS111
Rev. 1.6 6/05
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AS111
TYPICAL PERFORMANCE CHARACTERISTICS
AS111
Rev. 1.6 6/05
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AS111
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
AS111
Rev. 1.6 6/05
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AS111
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
should be shorted together. If they are connected to a trimpot, 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.
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 AS111. To 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
AS111
Rev. 1.6 6/05
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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APPLICATION HINTS (CONTINUED)
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.
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.)
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 V OS 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.
AS111
Rev. 1.6 6/05
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AS111
APPLICATION HINTS (CONTINUED)
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)
AS111
Rev. 1.6 6/05
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AS111
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
10Hz to 10kHz Voltage Controlled Oscillator
AS111
Rev. 1.6 6/05
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AS111
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
AS111
Rev. 1.6 6/05
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AS111
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
AS111
Rev. 1.6 6/05
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AS111
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
AS111
Rev. 1.6 6/05
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AS111
TYPICAL APPLICATIONS (Pin numbers refer to TO08 can package)(Continued)
AS111
Rev. 1.6 6/05
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AS111
SCHEMATIC DIAGRAM20
NOTE 20: Pin connections shown on schematic diagram are for the TO08 can package.
AS111
Rev. 1.6 6/05
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AS111
MECHANICAL DEFINITIONS*
ASI Case (Package Designator C008)
SMD 5962-86877, Case Outline P
SYMBOL
A
b
b2
c
D
E
e
eA
L
Q
S1
S2
ASI SPECIFICATIONS
MIN
MAX
--0.200
0.014
0.026
0.045
0.065
0.008
0.018
--0.405
0.220
0.310
0.100 BCS
0.300 BSC
0.125
0.200
0.015
0.060
0.005
--0.005
---
*All measurements are in inches.
AS111
Rev. 1.6 6/05
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AS111
MECHANICAL DEFINITIONS*
ASI Case (Package Designator C014)
M38510/10304B, Case Outline C
SYMBOL
A
b
b2
c
D
E
e
eA
L
Q
S1
S2
ASI SPECIFICATIONS
MIN
MAX
--0.200
0.014
0.026
0.045
0.065
0.008
0.018
--0.785
0.220
0.310
0.100 BCS
0.300 BSC
0.125
0.200
0.015
0.060
0.005
--0.005
---
*All measurements are in inches.
AS111
Rev. 1.6 6/05
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AS111
MECHANICAL DEFINITIONS*
ASI Case (Package Designator E020)
SMD 5962-86877, Case Outline 2
D2
A
L1
E2
E1
e
E
L
B1
D1
D
A1
SYMBOL
A
A1
B1
D/E
D1/E1
D2/E2
e
L
L1
ASI SPECIFICATIONS
MIN
MAX
0.060
0.100
0.050
0.088
0.022
0.028
0.342
0.358
--0.358
0.200 BSC
0.050 BSC
0.045
0.055
0.075
0.095
*All measurements are in inches.
AS111
Rev. 1.6 6/05
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AS111
MECHANICAL DEFINITIONS*
ASI Case (Package Designator TO08)
SMD 5962-86877, Case Outline G
SYMBOL
A
b
b1
b2
D
D1
D2
e
e1
F
k
k1
L
L1
L2
Q
α
β
ASI SPECIFICATIONS
MIN
MAX
0.165
0.185
0.016
0.019
0.016
0.021
0.016
0.024
0.335
0.375
0.305
0.335
0.110
0.160
0.200 BSC
0.100 BSC
--0.040
0.027
0.034
0.027
0.045
0.500
0.750
--0.050
0.250
--0.010
0.045
45° BSC
45° BSC
*All measurements are in inches.
AS111
Rev. 1.6 6/05
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AS111
ORDERING INFORMATION
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
/*
*AVAILABLE PROCESSES:
XT = Extended Temperature Range
/883C = MIL-STD-883 paragraph 1.2.1
AS111
Rev. 1.6 6/05
-55oC to +125oC
-55oC to +125oC
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AS111
ASI TO DSCC PART NUMBER
CROSS REFERENCE
ASI PART NUMBER
DSCC PART NUMBER
AS111C008/883C
AS111E020/883C
AS111TO08/883C
5962-8687701PA
5926-86877012A
5962-8687701GA
AS111C008/883C
AS111E020/883C
AS111TO08/883C
AS111C014/883C
M38510/10304BPA
M38510/10304B2A
M38510/10304BGA
M38510/10304BCA
* ASI part number is for reference only. Orders received referencing the SMD part number will be processed per the SMD.
AS111
Rev. 1.6 6/05
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21