LT1011ACN8#PBF [Linear]
LT1011/LT1011A - Voltage Comparator; Package: PDIP; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT1011ACN8#PBF |
| 厂家： | 
Linear |
| 描述： | LT1011/LT1011A - Voltage Comparator; Package: PDIP; Pins: 8; Temperature Range: 0°C to 70°C 放大器 光电二极管 |
| 文件： | 总20页 (文件大小：289K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1011/LT1011A
Voltage Comparator
FeaTures
DescripTion
The LT®1011 is a general purpose comparator with sig-
nificantly better input characteristics than the LM111.
Although pin compatible with the LM111, it offers four
times lower bias current, six times lower offset voltage
and five times higher voltage gain. Offset voltage drift,
a previously unspecified parameter, is guaranteed at
15µV/°C. Additionally, the supply current is lower by
a factor of two with no loss in speed. The LT1011 is
several times faster than the LM111 when subjected to
large overdrive conditions. It is also fully specified for DC
parameters and response time when operating on a single
5V supply. The LT1011 retains all the versatile features of
the LM111, including single 3V to 1ꢀV supply operation,
and a floating transistor output with 50mA source/sink
capability. It can drive loads referenced to ground, nega-
tive supply or positive supply, and is specified up to 50V
n
Pin Compatible with LM111 Series Devices
n
Guaranteed Max 0.5mV Input Offset Voltage
n
Guaranteed Max 25nA Input Bias Current
n
Guaranteed Max 3nA Input Offset Current
n
Guaranteed Max 250ns Response Time
n
Guaranteed Min 200,000 Voltage Gain
n
50mA Output Current Source or Sink
n
30V Differential Input Voltage
n
Fully Specified for Single 5V Operation
n
Available in ꢀ-Lead PDIP and SO Packages
applicaTions
n
SAR A/D Converters
n
Voltage-to-Frequency Converters
n
Precision RC Oscillator
–
n
Peak Detector
between V and the collector output. A differential input
n
Motor Speed Control
voltage up to the full supply voltage is allowed, even with
1ꢀV supplies, enabling the inputs to be clamped to the
supplies with simple diode clamps.
n
Pulse Generator
n
Relay/Lamp Driver
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
10µs 12-Bit A/D Converter
3.9k
Response Time vs Overdrive
R1
1k
15V
LM329
7V
500
450
FULL-SCALE
TRIM
*R2 AND R4
SHOULD TC TRACK
–15V
R2*
6.49k
R3
6.98k
400
350
0.001µF
15V
INPUT
0V TO 10V
300
250
5V
FALLING
OUTPUT
6012
12-BIT
D/A CONVERTER
R4*
2.49k
R5
1k
200
150
100
50
RISING
OUTPUT
+
R6
LT1011A
820Ω
–
PARALLEL
OUTPUTS
PARALLEL
OUTPUTS
0
0.1
1
10
100
SERIAL OUTPUT
OVERDRIVE (mV)
1011 TA02
7475
LATCH
D
AM2504
SAR REGISTER
5V
CC
S
E
S
CP
START
CLOCK f = 1.4MHz
1011 TA01
1011afe
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For more information www.linear.com/LT1011
LT1011/LT1011A
absoluTe MaxiMuM raTings
(Note 1)
Supply Voltage (Pin ꢀ to Pin 4) .................................36V
Output to Negative Supply (Pin 7 to Pin 4)
Input Voltage (Note 2)..........................Equal to Supplies
Output Short-Circuit Duration...............................10 sec
Operating Temperature Range (Note 3)
LT1011AC, LT1011C.................................. 0°C to 70°C
LT1011AI, LT1011I................................–40°C to ꢀ5°C
LT1011AM, LT1011M (OBSOLETE)..... –55°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
LT1011AC, LT1011C...............................................40V
LT1011AI, LT1011I.................................................40V
LT1011AM, LT1011M (OBSOLETE)........................50V
Ground to Negative Supply (Pin 1 to Pin 4) ..............30V
Differential Input Voltage ........................................ 36V
Voltage at STROBE Pin (Pin 6 to Pin ꢀ).......................5V
pin conFiguraTion
TOP VIEW
+
V
TOP VIEW
+
8
GND
+
1
3
7
5
OUTPUT
BALANCE/
GND
1
2
3
4
V
8
7
6
5
+
INPUT
OUTPUT
BALANCE/
STROBE
+
–
+
–
INPUT
2
6
STROBE
–
INPUT
–
BALANCE
INPUT
–
V
BALANCE
4
–
V
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
H PACKAGE
8-LEAD TO-5 METAL CAN
T
= 150°C, θ = 130°C/W(Nꢀ)
JA
= 150°C, θ = 150°C/W(Sꢀ)
JA
JMAX
T
JMAX
T
= 150°C, θ = 150°C/W, θ = 45°C/W
JA JC
JMAX
OBSOLETE PACKAGE
Consider the Nꢀ or Sꢀ Packages for Alternate Source
1011afe
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For more information www.linear.com/LT1011
LT1011/LT1011A
orDer inForMaTion
LEAD FREE FINISH
LT1011ACNꢀ#PBF
LT1011CNꢀ#PBF
LT1011AISꢀ#PBF
LT1011CSꢀ#PBF
LT1011ISꢀ#PBF
TAPE AND REEL
PART MARKING*
LT1011
PACKAGE DESCRIPTION
ꢀ-Lead Plastic DIP
ꢀ-Lead Plastic DIP
ꢀ-Lead Plastic SO
ꢀ-Lead Plastic SO
ꢀ-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
N/A
N/A
LT1011
0°C to 70°C
LT1011AISꢀ#TRPBF
LT1011CSꢀ#TRPBF
LT1011ISꢀ#TRPBF
1011AI
–40°C to ꢀ5°C
0°C to 70°C
1011
1011I
–40°C to ꢀ5°C
OBSOLETE PACKAGES
LT1011ACH#PBF
LT1011CH#PBF
LT1011AMH#PBF
LT1011MH#PBF
LT1011ACJꢀ#PBF
LT1011CJꢀ#PBF
LT1011AMJꢀ#PBF
LT1011MJꢀ#PBF
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
ꢀ-Lead TO-5 Metal Can
ꢀ-Lead TO-5 Metal Can
ꢀ-Lead TO-5 Metal Can
ꢀ-Lead TO-5 Metal Can
ꢀ-Lead CERDIP
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
ꢀ-Lead CERDIP
ꢀ-Lead CERDIP
ꢀ-Lead CERDIP
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
1011afe
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For more information www.linear.com/LT1011
LT1011/LT1011A
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 15V, VCM = 0V, RS = 0Ω, VGND = –15V, output at pin 7 unless
otherwise noted.
LT1011AC/AI/AM
LT1011C/I/M
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX UNITS
V
Input Offset Voltage
*Input Offset Voltage
*Input Offset Current
(Note 4)
0.3
0.5
1
0.6
1.5
3
mV
mV
OS
●
●
●
R ≤ 50k (Note 5)
S
0.75
1.5
2
3
mV
mV
I
I
(Note 5)
0.2
3
5
0.2
4
6
nA
nA
OS
Input Bias Current
*Input Bias Current
(Note 4)
(Note 5)
15
20
25
20
25
50
nA
B
35
50
65
ꢀ0
nA
nA
●
●
∆V
∆T
Input Offset Voltage Drift
(Note 6)
T
≤ T ≤ T
MAX
4
15
4
25
µV/°C
V/mV
V/mV
OS
MIN
A
*Large-Signal Voltage Gain
R = 1k Connected to 15V,
200
50
500
300
200
50
500
300
VOL
L
–10V ≤ V
≤ 14.5V
OUT
R = 500Ω Connected to 5V,
L
V = Single 5V, V
= 0V,
S
GND
≤ 4.5V
0.5V ≤ V
OUT
CMRR
Common Mode Rejection Ratio
*Input Voltage Range (Note 9)
94
115
90
115
dB
●
●
V = 15V
S
–14.5
0.5
13
3
–14.5
0.5
13
3
V
V
S
V = Single 5V
t
D
*Response Time
(Note 7)
150
250
150
250
ns
V
OL
*Output Saturation Voltage,
GND
V
IN
V
IN
V
IN
= –5mV, I
= –5mV, I
= –5mV, I
= ꢀmA, T ≤ 100°C
0.25
0.25
0.7
0.4
0.45
1.5
0.25
0.25
0.7
0.4
0.45
1.5
V
V
V
SINK
SINK
SINK
J
V
= 0
= ꢀmA
●
●
= 50mA
*Output Leakage Current
V
V
= 5mV, V
OUT
= –15V,
GND
0.2
10
500
0.2
10
500
nA
nA
IN
= 20V
●
*Positive Supply Current
*Negative Supply Current
*Strobe Current (Note ꢀ)
V
V
= 0
3.2
1.7
4
3.2
1.7
4
mA
mA
µA
GND
GND
= 0
2.5
2.5
Minimum to Ensure Output Transistor is Off,
= 0
500
500
V
GND
Input Capacitance
6
6
pF
*Indicates parameters which are guaranteed for all supply voltages, including a single 5V supply. See Note 5.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
defines a worst-case error band that includes effects due to common
mode signals, voltage gain and output load.
Note 6: Drift is calculated by dividing the offset voltage difference
measured at min and max temperatures by the temperature difference.
Note 2: Inputs may be clamped to supplies with diodes so that
maximum input voltage actually exceeds supply voltage by one diode
drop. See Input Protection in the Applications Information section.
Note 7: Response time is measured with a 100mV step and 5mV
overdrive. The output load is a 500Ω resistor tied to 5V. Time
measurement is taken when the output crosses 1.4V.
Note 3: TJMAX = 150°C.
Note 4: Output is sinking 1.5mA with VOUT = 0V.
Note 5: These specifications apply for all supply voltages from a single
5V to 15V, the entire input voltage range, and for both high and low
output states. The high state is ISINK = 100µA, VOUT = (V+ – 1V) and
the low state is ISINK = ꢀmA, VOUT = 0.ꢀV. Therefore, this specification
Note 8: Do not short the STROBE pin to ground. It should be current
driven at 3mA to 5mA for the shortest strobe time. Currents as low
as 500µA will strobe the LT1011A if speed is not important. External
leakage on the STROBE pin in excess of 0.2µA when the strobe is “off”
can cause offset voltage shifts.
Note 9: See graph “Input Offset Voltage vs Common Mode Voltage.”
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For more information www.linear.com/LT1011
LT1011/LT1011A
Typical perForMance characTerisTics
Input Bias Current
Input Offset Current
Worst-Case Offset Error
100
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
45
40
35
30
25
20
15
10
5
I
FLOWS OUT
B
OF INPUTS
LM311
(FOR COMPARISON)
10
1
LT1011M
LT1011C
LT1011AM
LT1011AC
0.1
0
0
–50 –25
25 50 75 100 125 150
0
1k
10k
100k
1M
–50 –25
25 50 75 100 125 150
SOURCE RESISTANCE (Ω)
TEMPERATURE (°C)
TEMPERATURE (°C)
1011 G03
1011 G02
1011 G01
Input Characteristics*
Common Mode Limits
Transfer Function (Gain)
+
50
40
30
20
10
0
5
0
V
T
= 25°C
A
*EITHER INPUT.
–0.5
–1.0
–1.5
–2.0
0.4
REMAINING INPUT GROUNDED.
CURRENT FLOWS OUT OF INPUT.
COLLECTOR
OUTPUT
POSITIVE LIMIT
–5
V
= 15V
S
R
L
= 1k
–10
–15
–20
–25
–30
–35
–40
REFERRED TO SUPPLIES
NEGATIVE LIMIT
0.3
0.2
EMITTER
OUTPUT
0.1
R
L
= 600Ω
–
V
– 0.5
–0.3
–0.1
0.1
0.3
0.5
–10
0
150
–20 –15
–5
0
5
10 15 20
–50 –25
25 50 75 100 125
TEMPERATURE (°C)
DIFFERENTIAL INPUT VOLTAGE (mV)
INPUT VOLTAGE (V)
1011 G04
1011 G05
1011 G06
Collector Output Saturation
Voltage
Response Time—Collector Output
Response Time—Collector Output
6
5
4
3
2
1
0
6
5
4
3
2
1
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
=
15V
V
=
S
15V
PIN 1 GROUNDED
S
15V
5V
500Ω
V
IN
–
+
OVERDRIVE
20mV
T
= 125°C
OVERDRIVE
20mV
A
15V
5V
5mV
2mV
T
= 25°C
A
5mV
2mV
500Ω
V
IN
–
+
–15V
T
= –55°C
A
–15V
100mV
0
0
INPUT = 100mV STEP
INPUT = 100mV STEP
–100mV
0
50 100 150 200 250 300 350 400 450
0
50 100 150 200 250 300 350 400 450
0
5
10 15 20 25 30 35 40 45 50
TIME (ns)
TIME (ns)
SINK CURRENT (mA)
1011 G07
1011 G08
1011 G09
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For more information www.linear.com/LT1011
LT1011/LT1011A
Typical perForMance characTerisTics
Response Time Using GND Pin
as Output
Response Time Using GND Pin
as Output
Output Limiting Characteristics*
140
120
100
80
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
+
V
T = 25°C
A
15
10
15
10
–
20mV
5mV
2mV
–
V
IN
+
POWER
DISSIPATION
V
5
5
+
V
V
IN
OUT
0
0
2k
–5
–5
+
V
OUT
–
V
–10
–15
0
–10
–15
–100
–50
0
2k
=
60
SHORT-CIRCUIT
CURRENT
5mV
2mV
20mV
–
V
40
V
=
15V
S
A
–50
–100
T
= 25°C
20
V
15V
S
A
*MEASURED 3 MINUTES
AFTER SHORT
T
= 25°C
0
0
2
TIME (µs)
3
4
0
2
3
4
0
10
5
OUTPUT VOLTAGE (V)
15
1
1
TIME (µs)
1011 G10
1011 G11
1011 G12
Supply Current vs Supply Voltage
Supply Current vs Temperature
Output Leakage Current
–7
–8
–9
5
4
3
2
6
5
4
3
10
10
10
V
= 15V
S
POSITIVE SUPPLY
COLLECTOR OUTPUT “LO”
POSITIVE SUPPLY
COLLECTOR OUTPUT “LO”
V
V
= 35V
= –15V
OUT
GND
POSITIVE AND NEGATIVE SUPPLY
COLLECTOR OUTPUT “HI”
2
1
0
–10
–11
10
10
1
0
POSITIVE AND NEGATIVE SUPPLY
COLLECTOR OUTPUT “HI”
50
TEMPERATURE (˚C)
100 125
0
10
15
20
25
30
–50 –25
0
25
75
5
25
45
65
85
105
125
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
1011 G13
1011 G14
1011 G15
Output Saturation—
Ground Output
Output Saturation Voltage
Response Time vs Input Step Size
5
4
3
2
1
0
1000
800
0.6
+
V
= 15V
REFERRED TO V
I
= 8mA
S
+
SINK
V
2
+
8
R = 500Ω TO 5V
L
+
OVERDRIVE = 5mV
0.5
0.4
0.3
0.2
0.1
0
7
LT1011
T
J
= 125°C
–
5V
3
1
R
L
–
3
500Ω
7
INPUT
4
–
V
600
OUT
V
T = –55°C
J
2
+
T
= 25°C
J
1
400
200
0
T = 25°C
J
RISING INPUT
FALLING INPUT
T
= –55°C
J
T = 125°C
J
0
10
20
30
40
50
5
6
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
7
8
INPUT OVERDRIVE (mV)
OUTPUT CURRENT (mA)
INPUT STEP (V)
1011 G16
1011 G18
1011 G17
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LT1011/LT1011A
Typical perForMance characTerisTics
Input Offset Voltage
vs Common Mode Voltage
Offset Pin Characteristics
2.5
2.0
0.8
0.6
0.4
0.2
0
T = 25°C
J
1.5
CHANGE IN V FOR CURRENT
OS
1.0
UPPER
INTO PINS 5 OR 6
COMMON MODE
+
0.5
LIMIT = V – (1.5V)
0
VOLTAGE ON PINS 5 AND 6
–0.5
–1.0
–1.5
–2.0
–2.5
+
WITH RESPECT TO V
–150mV
–100mV
–50mV
–
V
(OR GND WITH
SINGLE SUPPLY)
0
–
+
V
0.1 0.2 0.3 0.4 0.5 0.6 0.7
COMMON MODE VOLTAGE (V)
V
25
150
50 75 100 125
–50 –25
0
TEMPERATURE (°C)
1011 G19
1011 G20
pin FuncTions
GND (PIN 1): Ground.
BALANCE/STROBE (PIN 6): Strobe Input Pin. Using this
pin, the output transistor can be forced to an “off” state,
giving a “hi” output at the collector (Pin 7). This input can
be used to adjust the input voltage offset or used to add
hysteresis. If offset balancing or hysteresis is not used,
the BALANCE pins should be connected together with a
0.1µF capacitor.
+
INPUT (PIN 2): Non-Inverting Input of Comparator
–
INPUT (PIN 3): Inverting Input of Comparator
–
V (PIN 4): Negative Supply Voltage
OUT (PIN 7): Open-Collector Output of Comparator
+
BALANCE (PIN 5): Balance Input. This input can be used
to adjust the input voltage offset or to add hysteresis. If
offset balancing or hysteresis is not used, the BALANCE
pins should be connected together with a 0.1µF capacitor.
V (PIN 8): Positive Supply Voltage
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LT1011/LT1011A
applicaTions inForMaTion
Preventing Oscillation Problems
3. Bypass any slow moving or DC input with a capaci-
tor (≥0.01µF) close to the comparator to reduce high
frequency source impedance.
Oscillation problems in comparators are nearly always
caused by stray capacitance between the output and
inputs or between the output and other sensitive pins
on the comparator. This is especially true with high
gain bandwidth comparators like the LT1011, which are
designed for fast switching with millivolt input signals.
The gain bandwidth product of the LT1011 is over 10GHz.
Oscillation problems tend to occur at frequencies around
5MHz, wheretheLT1011hasagainof≈2000. Thisimplies
thatattenuationofoutputsignalsmustbeatleast2000:1at
5MHz as measured at the inputs. If the source impedance
is1kΩ, theeffectivestraycapacitancebetweenoutputand
input must have a reactance of more than (2000)(1kΩ) =
2MΩ,orlessthan0.02pF.Theactualinterleadcapacitance
between input and output pins on the LT1011 is less than
0.002pFwhencuttoprintedcircuitmountlength.Additional
stray capacitance due to printed circuit traces must be
minimized by routing the output trace directly away from
input lines and, if possible, running ground traces next
to input traces to provide shielding. Additional steps to
ensure oscillation-free operation are:
4. Keep resistive source impedance as low as possible. If
a resistor is added in series with one input to balance
source impedances for DC accuracy, bypass it with a
capacitor. The low input bias current of the LT1011
usually eliminates any need for source resistance bal-
ancing. A 5kΩ imbalance, for instance, will create only
0.25mV DC offset.
5. Use hysteresis. This consists ofshifting theinput offset
voltage of the comparator when the output changes
state.Hysteresisforcesthecomparatortomovequickly
through its linear region, eliminating oscillations by
“overdriving”thecomparatorunderallinputconditions.
Hysteresis may be either AC or DC. AC techniques do
not shift the apparent offset voltage of the compara-
tor, but require a minimum input signal slew rate to be
effective. DC hysteresis works for all input slew rates,
but creates a shift in offset voltage dependent on the
previousconditionoftheinputsignal.Thecircuitshown
in Figure 1 is an excellent compromise between AC and
DC hysteresis.
1. BypasstheSTROBE/BALANCEpinswitha0.01µFcapaci-
tor connected from Pin 5 to Pin 6. This eliminates stray
capacitive feedback from the output to the BALANCE
pins, which are nearly as sensitive as the inputs.
15V
+
2µF
C1
R
TANT
L
R2
15M
2. Bypassthenegativesupply(Pin4)witha0.1µFceramic
capacitor close to the comparator. 0.1µF can also be
used for the positive supply (Pin ꢀ) if the pull-up load
is tied to a separate supply. When the pull-up load is
tied directly to Pin ꢀ, use a 2µF solid tantalum bypass
capacitor.
0.003µF
8
–
+
3
2
6
5
7
OUTPUT
INPUTS
LT1011
1
4
–15V
0.1µF
1011 F01
Figure 1. Comparator with Hysteresis
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For more information www.linear.com/LT1011
LT1011/LT1011A
applicaTions inForMaTion
This circuit is especially useful for general purpose
comparator applications because it does not force
any signals directly back onto the input signal source.
Instead, it takes advantage of the unique properties
of the BALANCE pins to provide extremely fast, clean
output switching even with low frequency input signals
in the millivolt range. The 0.003µF capacitor from Pin
6 to Pin ꢀ generates AC hysteresis because the voltage
on the BALANCE pins shifts slightly, depending on the
state of the output. Both pins move about 4mV. If one
pin (6) is bypassed, AC hysteresis is created. It is only
a few millivolts referred to the inputs, but is sufficient
to switch the output at nearly the maximum speed of
which the comparator is capable. To prevent problems
fromlowvaluesofinputslewrate,aslightamountofDC
hysteresis is also used. The sensitivity of the BALANCE
pins to current is about 0.5mV input referred offset for
each microampere of BALANCE pin current. The 15M
resistortiedfromOUTPUTtoPin5generates0.5mVDC
hysteresis. The combination of AC and DC hysteresis
creates clean oscillation-free switching with very small
input errors. Figure 2 plots input referred error versus
switching frequency for the circuit as shown.
Input Protection
The inputs to the LT1011 are particularly suited to general
purposecomparatorapplicationsbecauselargedifferential
and/or common mode voltages can be tolerated without
damage to the comparator. Either or both inputs can be
raised 40V above the negative supply, independent of the
positive supply voltage. Internal forward biased diodes
will conduct when the inputs are taken below the negative
supply. In this condition, input current must be limited to
1mA. If very large (fault) input voltages must be accom-
modated, series resistors and clamp diodes should be
used (see Figure 3).
8
C8 TO C6 = 0.003µF
7
6
5
4
3
2
OUTPUT “LO” TO “HI”
1
0
OUTPUT “HI” TO “LO”
–1
–2
(50kHz)
10
(5kHz)
100
1
1000
Note that at low frequencies, the error is simply the
DC hysteresis, while at high frequencies, an addi-
tional error is created by the AC hysteresis. The high
TIME/FREQUENCY (µs)
1011 F02
Figure 2. Input Offset Voltage vs Time to Last Transition
frequency error can be reduced by reducing C , but
H
lower values may not provide clean switching with very
low slew rate input signals.
+
V
R3*
D1
D3
D2
R1**
R2**
300Ω
3
2
8
LT1011
4
–
+
R4*
300Ω
INPUTS
D4
D1 TO D4: 1N4148
*MAY BE ELIMINATED FOR I
–
V
≤ 1mA
FAULT
**SELECT ACCORDING TO ALLOWABLE
1011 F03
FAULT CURRENT AND POWER DISSIPATION
Figure 3. Limiting Fault Input Currents
1011afe
9
For more information www.linear.com/LT1011
LT1011/LT1011A
applicaTions inForMaTion
15V
8
5V
Theinputresistorsshouldlimitfaultcurrenttoareasonable
value (0.1mA to 20mA). Power dissipation in the resis-
tors must be considered for continuous faults, especially
whentheLT1011suppliesareoff.Onefinalcaution:lightly
loaded supplies may be forced to higher voltages by large
fault currents flowing through D1-D4.
3
2
R
L
–
+
7
LT1011
OUTPUT
1
6
4
TTL OR
CMOS DRIVE
(5V SUPPLY)
–15
R3 and R4 limit input current to the LT1011 to less than
3k
–
1mA when the input signals are held below V . They may
1011 F04
be eliminated if R1 and R2 are large enough to limit fault
current to less than 1mA.
Figure 4. Typical Strobe Circuit
level inputs. A 1pF capacitor between the output and Pin
5 will greatly reduce oscillation problems without reduc-
ing strobe speed.
Input Slew Rate Limitations
The response time of a comparator is typically measured
with a 100mV step and a 5mV to 10mV overdrive. Unfor-
tunately, thisdoesnotsimulatemanyrealworldsituations
where the step size is typically much larger and overdrive
can be significantly less. In the case of the LT1011, step
size is important because the slew rate of internal nodes
will limit response time for input step sizes larger than
1V. At 5V step size, for instance, response time increases
from 150ns to 360ns. See the curve “Response Time vs
Input Step Size for more detail.
DC hysteresis can also be added by placing a resistor
from the output to Pin 5. See step 5 under “Preventing
Oscillation Problems.”
Thepin(6)usedforstrobingisalsooneoftheoffsetadjust
pins. Current flow into or out of Pin 6 must be kept very
low (<0.2µA) when not strobing to prevent input offset
voltage shifts.
Output Transistor
If response time is critical and large input signals are ex-
pected,clampdiodesacrosstheinputsarerecommended.
The slew rate limitation can also affect performance when
differential input voltage is low, but both inputs must
slew quickly. Maximum suggested common mode slew
rate is 10V/µs.
The LT1011 output transistor is truly floating in the sense
that no current flows into or out of either the collector
or emitter when the transistor is in the “off” state. The
equivalent circuit is shown in Figure 5.
+
V
Strobing
I
1
The LT1011 can be strobed by pulling current out of the
STROBE pin. The output transistor is forced to an “off”
state, giving a “hi” output at the collector (Pin 7). Currents
as low as 250µA will cause strobing, but at low strobe
currents, strobe delay will be 200ns to 300ns. If strobe
current is increased to 3mA, strobe delay drops to about
60ns.ThevoltageattheSTROBEpinisabout150mVbelow
0.5mA
D1
D2
COLLECTOR
(OUTPUT)
Q1
R1
170Ω
OUTPUT
Q2
+
+
TRANSISTOR
–
V at zero strobe current and about 2V below V for 3mA
strobe current. Do not ground the STROBE pin. It must
be current driven. Figure 4 shows a typical strobe circuit.
V
R2
470Ω
EMITTER
(GND PIN) 1011 F05
Figure 5. Output Transistor Circuitry
Note that there is no bypass capacitor between Pins 5 and
6. This maximizes strobe speed, but leaves the compara-
tor more sensitive to oscillation problems for slow, low
1011afe
10
For more information www.linear.com/LT1011
LT1011/LT1011A
applicaTions inForMaTion
+
In the “off” state, I is switched off and both Q1 and Q2
is tied to V , the voltage at the emitter in the “on” state is
1
+
turn off. The collector of Q2 can be now held at any voltage
about 2V below V (see curves).
–
above V without conducting current, including voltages
Input Signal Range
above the positive supply level. Maximum voltage above
–
V is 50V for the LT1011M and 40V for the LT1011C/I.
The common mode input voltage range of the LT1011 is
about300mVabovethenegativesupplyand1.5Vbelowthe
positive supply, independent of the actual supply voltages
(seecurveintheTypicalPerformanceCharacteristics).This
is the voltage range over which the output will respond
correctly when the common mode voltage is applied to
one input and a higher or lower signal is applied to the
remaining input. If one input is inside the common mode
range and one is outside, the output will be correct. If the
inputs are outside the common mode range in opposite
directions, the outputwillstill becorrect. If both inputs are
outside the common mode range in the same direction,
the output will not respond to the differential input; for
temperatures of 25°C and above, the output will remain
unconditionally high (collector output), for temperatures
below 25°C, the output becomes undefined.
+
The emitter can be held at any voltage between V and
–
V as long as it is negative with respect to the collector.
In the “on” state, I is connected, turning on Q1 and Q2.
1
DiodesD1andD2preventdeepsaturationofQ2toimprove
speed and also limit the drive current of Q1. The R1/R2
dividersetsthesaturationvoltageofQ2andprovidesturn-
off drive. Either the collector or emitter pin can be held at
+
–
a voltage between V and V . This allows the remaining
pin to drive the load. In typical applications, the emitter is
–
connected to V or ground and the collector drives a load
+
tied to V or a separate positive supply.
When the emitter is used as the output, the collector is
+
typically tied to V and the load is connected to ground
–
or V . Note that the emitter output is phase reversed with
respect to the collector output so that the “+” and “–”
input designations must be reversed. When the collector
Typical applicaTions
Offset Balancing
Driving Load Referenced
to Positive Supply
Driving Load Referenced
to Negative Supply
R2
3k
+
++
+
V
V
V
V
3
2
8
R1
2
3
8
R
–
+
LOAD
+
–
+
20k
V
7
7
LT1011
5
INPUTS*
LT1011
1
2
3
6
1
+
–
4
8
7
R
LOAD
LT1011
4
V
V
OR
GROUND
1011 TA03
V
1011 TA06
++
+
V
CAN BE GREATER OR LESS THAN V
*INPUT POLARITY IS REVERSED
WHEN USING PIN 1 AS OUTPUT
1011 TA05
1011afe
11
For more information www.linear.com/LT1011
LT1011/LT1011A
Typical applicaTions
Strobing
Driving Ground Referred Load
Window Detector
++**
+
+
V
V
V
2
+
7
2
3
R
L
HIGH
LT1011
2
3
+
–
8
LIMIT
–
+
3
7
7
LT1011
–
6
INPUTS*
LT1011
OUTPUT HIGH
1
1
INSIDE “WINDOW”
AND LOW ABOVE
HIGH LIMIT OR
TTL
STROBE
L1
4
–
V
IN
BELOW LOW LIMIT
1k
2
3
V
1011 TA07
+
–
7
1011 TA04
*INPUT POLARITY IS REVERSED
WHEN USING PIN 1 AS OUTPUT
LT1011
LOW
LIMIT
NOTE: DO NOT GROUND STROBE PIN
++
–
**V MAY BE ANY VOLTAGE ABOVE V .
1
++
PIN 1 SWINGS TO WITHIN ≈2V OF V
1011 TA08
Crystal Oscillator
Using Clamp Diodes to Improve Frequency Response*
CURRENT MODE
2
3
5V
INPUT
+
–
10k
(DAC, ETC)
7
LT1011
OUTPUT
D1
D2
1k
50k
2
8
+
VOLTAGE
INPUT
7
85kHz
100pF
LT1011
OUT
R1
3
4
GROUND OR
LOW IMPEDANCE
REFERENCE
–
1
10k
*SEE CURVE, “RESPONSE TIME vs INPUT STEP SIZE”
1011 TA09
10k
1011 TA10
Noise Immune 60Hz Line Sync**
High Efficiency** Motor Speed Controller
5V
15V
R3
1k
R2
75k
+
C1
50µF
R1
1k
2V
RMS
Q1
TO
25V
5V
2N6667
R1*
RMS
330k
3
60Hz
INPUT
8
–
1N4002
7
OUTPUT
60Hz
C1
0.22µF
MOTOR-TACH
GLOBE 397A120-2
LT1011
2
1
+
R2
R3*
10k
R4
470Ω
4
27k
MOTOR TACH
R6
27k
15V
8
1011 TA11
R6
2k
5V
R5
100k
R5
10k
2
3
+
–
*INCREASE R1 FOR LARGER INPUT VOLTAGES
**LT1011 SELF OSCILLATES AT ≈60Hz CAUSING
IT TO “LOCK” ONTO INCOMING LINE SIGNAL
7
C2*
0.1µF
C3
0.1µF
R7
1k
LT1011
1
1011 TA12
R4
1k
4
*R3/C2 DETERMINES OSCILLATION
FREQUENCY OF CONTROLLER
**Q1 OPERATES IN SWITCH MODE
–5V TO
–15V
0V TO 10V
INPUT
1011afe
12
For more information www.linear.com/LT1011
LT1011/LT1011A
Typical applicaTions
Combining Offset Adjust and Strobe
Combining Offset Adjustment and Hystersis
+
+
V
V
5k
R *
10k
2R **
H
H
*HYSTERESIS IS ≈0.45mV/µA OF
CURRENT CHANGE IN R
20k
H
6
20k
5
**THIS RESISTOR CAUSES HYSTERESIS
R
L
–
3
TTL OR CMOS
5V
TO BE CENTERED AROUND V
OS
–
3
5
7
1011 TA15
6
2 +LT1011
2 +LT1011
1k
1
1011 TA13
Direct Strobe Drive When CMOS* Logic
Uses Same V+ Supply as LT1011
Low Drift R/C Oscillator†
+
V
**
15V
15V
8
–
3
74HC04
×6
2
3
6
8
1k
+
2 +LT1011
C1
0.015µF
7
BUFFERED
OUTPUT
1011 TA14
LT1011
4
–
*NOT APPLICABLE FOR TTL LOGIC
1
Positive Peak Detector
15V
10k*
10k*
15V
2k
3
2
8
*1% METAL FILM
INPUT
***
+
–
10k*
**TRW TYPE MTR-5/120ppm/°C, 25k ≤ R ≤ 200k
S
7
LT1011
C1: 0.015µF = POLYSTYRENE, –120ppm/°C,
30ppm WESCO TYPE 32-P
1011 TA16
2
1
–
NOTE: COMPARATOR CONTRIBUTES ≤10ppm/°C DRIFT
FOR FREQUENCIES BELOW 10kHz
LOW DRIFT AND ACCURATE FREQUENCY ARE
OBTAINED BECAUSE THIS CONFIGURATION
REJECTS EFFECTS DUE TO INPUT OFFSET
VOLTAGE AND BIAS CURRENT OF THE
COMPARATOR
6
OUTPUT
LT1008
4
10k
3
†
+
8
1M**
+
100pF
C1*
2µF
1011 TA17
–15V
*MYLAR
**SELECT FOR REQUIRED RESET TIME CONSTANT
***INPUT POLARITY IS REVERSED WHEN USING PIN 1 AS OUTPUT
Negative Peak Detector
15V
2
–
+
1M**
2k
3
2
6
8
OUTPUT
–
+
LT1008
8
10k
7
3
LT1011
1
+
100pF
INPUT
C1*
2µF
1011 TA18
4
*MYLAR
**SELECT FOR REQUIRED RESET TIME CONSTANT
–15V
1011afe
13
For more information www.linear.com/LT1011
LT1011/LT1011A
Typical applicaTions
4-Digit (10,000 Count) A/D Converter
15V
INPUT
0V TO 10V
15V
ZERO
TRIM
R1
1k
C4
0.01µF
R5
4.7k
5V
R2
18k
8
C5
0.01µF
R6
2
1
+
4.7K
6
1
7
LT1011
2
OUTPUT = 1 COUNT
PER mV, f = 1MHz
3
3
5
CLOCK
1MHz
LF398
4
–
6
R7
4
5V
7
22Ω
D1
D2
–15V
R3
8
3.9k
15V
–15V
C1*
0.1µF
C2**
15pF
C3
0.1µF
R11
6.8K
R4
5.6k
R8
3k
R10
D3
1k
15V
R9
3.65k
FULL-SCALE
TRIM
R12
6.8k
D4
2N3904
C6
50pF
LM329
ALL DIODES: 1N4148
*POLYSTYRENE
**NPO
1011 TA19
START
≥12ms
Capacitance to Pulse Width Converter
T
T
≥ [C
(pF)][1µs/pF]
MAX
H
L
MAX
≥ 10 • C
• (1µs/pF)
D1
TTL OR CMOS
(OPERATING
ON 5V)
GAIN ADJ
5V
R2
100k
R1
5k
R1 + R4
R1
*PW = (R2 + R3)(C)
, INPUT CAPACITANCE OF
(
)
R3
86.6k
8
0.01µF
7
R5
4.7k
LT1011 IS ≈6pF. THIS IS AN OFFSET TERM.
2
3
+
–
+
6
1
**TYPICAL 2 SECTIONS OF 365pF VARIABLE
CAPACITOR WHEN USED AS SHAFT ANGLE
INDICATION
†
OUTPUT
1µs/pF
10µF
LT1011
4
†
THESE COMPONENTS MAY BE ELIMINATED IF
NEGATIVE SUPPLY IS AVAILABLE (–1V TO –15V)
C**
†
D3
†
†
10µF
D2
+
1011 TA20
1011afe
14
For more information www.linear.com/LT1011
LT1011/LT1011A
Typical applicaTions
Fast Settling Filter
100pF
1M
15V
7
2
3
1M
6
LT1008C
OUTPUT
4.7k
8
V
IN
1
4
4.7k
1µF
–15V 15V
4
OFM-1A
1.5k
–15V 100pF
0.1µF
100k
2
3
8
–
7
1
LT1011
5
+
6
INPUT*
15V
15V
COMPARATORS DRIVE OPTO-COUPLED FET
“ON” WHEN DIFFERENCE BETWEEN OUTPUT
AND INPUT EXCEEDS THRESHOLD. WHEN
OUTPUT APPROACHES INPUT, THE GATE TURNS
“OFF” AND LOW PASS FILTERING OCCURS.
5k
THRESHOLD
5k
6
+
3
2
5
7
*INPUT POLARITY IS REVERSED WHEN USING
PIN 1 AS OUTPUT
1
LT1011
–
8
4
10k
–15V 15V
1011 TA21
100kHz Precision Rectifier
0.033µF
100Ω
5V
5V
5V
5V
2
3
8
1k
AC INPUT
+
–
12k
74C04
5k
820Ω
5V
7
LT1011
ZERO
CROSS
TRIM
HP5082-2800
×4
1
–5V
RECTIFIED
OUTPUT
4
–5V
1k
820Ω
74C04
–5V
12k
–5V
1011 TA23
1011afe
15
For more information www.linear.com/LT1011
LT1011/LT1011A
scheMaTic DiagraM
+
OFFSET
OFFSET/STROBE
6
V
5
8
R8
800Ω
R9
800Ω
Q6
Q10
R1
1.3k
R2
1.3k
R4
300Ω
R3
300Ω
R23
4k
R27
3k
R5
160Ω
Q11
Q5
Q31
Q12
R10
4k
R6
3.2k
R7
3.2k
Q13
D1 D2
Q30
R11
170Ω
INPUT
(+)
Q8
Q7
D4
OUTPUT
7
D6
Q29
Q14
2
Q3
Q20
R22
200Ω
Q1
Q15
Q9 Q19
Q28
R12
470Ω
INPUT
(–)
D5
Q4
D7
Q27
R16
800Ω
3
Q2
Q24
Q16
R17
200Ω
R24
400Ω
R13
4Ω
Q26
Q23
Q21
Q25
R15
700Ω
R20
940Ω
1
Q22
Q18
Q17
GND
R25
1.6k
R26
1.6k
R19
500Ω
R18
275Ω
R21
960Ω
R14
4.8k
D3
4
1011 SD
–
V
1011afe
16
For more information www.linear.com/LT1011
LT1011/LT1011A
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
H Package
8-Lead TO-5 Metal Can (.230 Inch PCD)
(Reference LTC DWG # 05-0ꢀ-1321)
0.335 – 0.370
OBSOLETE PACKAGE
(8.509 – 9.398)
DIA
0.027 – 0.045
(0.686 – 1.143)
0.305 – 0.335
(7.747 – 8.509)
45°TYP
PIN 1
0.040
(1.016)
MAX
0.028 – 0.034
(0.711 – 0.864)
0.050
(1.270)
MAX
0.165 – 0.185
(4.191 – 4.699)
0.230
(5.842)
REFERENCE
PLANE
SEATING
PLANE
TYP
GAUGE
PLANE
0.500 – 0.750
(12.700 – 19.050)
0.010 – 0.045*
(0.254 – 1.143)
H8 (TO-5) 0.230 PCD 1197
0.110 – 0.160
(2.794 – 4.064)
INSULATING
STANDOFF
0.016 – 0.021**
(0.406 – 0.533)
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
0.016 – 0.024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-0ꢀ-1110)
OBSOLETE PACKAGE
0.405
(10.287)
MAX
CORNER LEADS OPTION
(4 PLCS)
0.005
(0.127)
MIN
6
5
8
7
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.025
0.220 – 0.310
(5.588 – 7.874)
0.045 – 0.068
(0.635)
RAD TYP
(1.143 – 1.727)
FULL LEAD
OPTION
1
2
3
4
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
0.015 – 0.060
(0.381 – 1.524)
0.008 – 0.018
(0.203 – 0.457)
0° – 15°
0.045 – 0.065
(1.143 – 1.651)
0.125
3.175
MIN
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
0.014 – 0.026
(0.360 – 0.660)
0.100
(2.54)
BSC
J8 1298
1011afe
17
For more information www.linear.com/LT1011
LT1011/LT1011A
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-0ꢀ-1510)
.400ꢁ
(10.160)
MAX
.130 .005
.300 – .325
.045 – .065
(3.302 0.12ꢀ)
(1.143 – 1.651)
(ꢀ.620 – 8.255)
8
1
ꢀ
6
5
4
.065
(1.651)
TYP
.255 .015ꢁ
(6.4ꢀꢀ 0.381)
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
–.015
2
3
.325
.018 .003
(0.45ꢀ 0.0ꢀ6)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1002
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
ꢁTHESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-0ꢀ-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.010 – .020
(0.254 – 0.508)
7
5
8
6
× 45°
.053 – .069
(1.346 – 1.752)
.045 .005
.160 .005
.050 BSC
.004 – .010
(0.101 – 0.254)
.008 – .010
0°– 8° TYP
(0.203 – 0.254)
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.016 – .050
(0.406 – 1.270)
.245
MIN
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
1
2
3
4
.030 .005
TYP
SO8 0303
RECOMMENDED SOLDER PAD LAYOUT
1011afe
18
For more information www.linear.com/LT1011
LT1011/LT1011A
revision hisTory (Revision history begins at Rev D)
REV
DATE
DESCRIPTION
PAGE NUMBER
D
10/12 Update to Product Description
Addition of Order Information
1
2, 3
7
Addition of Pin Function Information
Correction to Positive Peak Detector Circuit
13
2, 7
3
E
4/13
Correction to Pin Function descriptions
Correction to Order Information and Obsolete Packages
Correction to Graphs:
5, 6
Response Time—Collector Output – high to low
Response Time Using GND Pin as Output – low to high
Response Time Using GND Pin as Output – high to low
Output Saturation—Ground Output
Correction to input pin polarity
10, 13, 15
1011afe
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LT1011/LT1011A
Typical applicaTion
10Hz to 100kHz Voltage to Frequency Converter
R7
4.7k
R4
1M
15V
15V
R1
C1
0.002µF
4.7k
POLYSTYRENE
LT1009
2.5V
15V
R2
5k
R5
R6
15V
8
2k
FULL-SCALE
TRIM
R3
2k
LINEARITY ≈0.01%
8.06k
3
2
INPUT
0V TO 10V
–
+
R8
4.7k
C2
0.68µF
7
LT1011
1
15V
–15V
4
†
1.5µs
R17
22M
6
R16
50k
10Hz TRIM
4.4V
–15V
15V
15V
0.002µF
10pF
–15V
R9
5k
TTL OUTPUT
10HZ TO 100kHz
–15V
R11
20k
1.5µs
Q2
R10
2.7k
ALL DIODES 1N4148
R15 R14
22k 1k
TRANSISTORS 2N3904
USED ONLY TO GUARANTEE
START-UP
*
†
R12
100k
1011 TA22
Q1*
MAY BE INCREASED FOR BETTER
10Hz TRIM RESOLUTION
+
R13
620k
2µF
–15V
relaTeD parTs
PART NUMBER
LT1016
DESCRIPTION
COMMENTS
UltraFast™ Precision Comparator
Industry Standard 10ns Comparator
Single Supply Version of the LT1016
7ns, 6mA Single Supply Comparator
450µA Single Supply Comparator
LT1116
12ns Single Supply Ground-Sensing Comparator
UltraFast Single Supply Comparator
60ns, Low Power Comparator
LT1394
LT1671
UltraFast is a trademark of Linear Technology Corporation.
1011afe
LT 0413 REV E • PRINTED IN USA
20 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
LINEAR TECHNOLOGY CORPORATION 1991
(40ꢀ)432-1900 FAX: (40ꢀ) 434-0507 www.linear.com/LT1011
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