LT1116
12ns, Single Supply
Ground-Sensing Comparator
FEATURES
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DESCRIPTIO
Ultra Fast (12ns Typ)
Operates off
Single
5V Supply or
±5V
Input Common Mode Extends to Negative Supply
No Minimum Input Slew Rate Requirement
Complementary TTL Output
Inputs Can Exceed the Positive Supply Up to 15V
without Damaging the Comparator
Low Offset Voltage
Pin-Compatible with LT1016
Output Latch Capability
Available in 8-Lead PDIP and SO Packages
The LT
®
1116 is an ultra fast (12ns) comparator designed
for sensing signals near the negative supply. The input
common mode range extends from 2.5V below the
positive supply down to the negative supply rail. Like the
LT1016, this comparator is specifically designed to
interface directly to TTL logic with complementary
outputs. The comparator may operate from either a single
5V supply or dual
±5V
supplies. Tight offset voltage
specifications and high gain allow the LT1116 to be used
in precision applications.
The LT1116 is designed for improved speed and stability
for a wide range of operating conditions. The output stage
provides active drive in both directions for maximum
speed into TTL logic or passive loads, yet it has minimal
cross-conduction current. Unlike other fast comparators,
the LT1116 remains stable even for slow transitions
through the active region, which eliminates the need to
specify a minimum input slew rate.
The LT1116 has an internal, TTL compatible latch for
retaining data at the outputs. The latch holds data as
long as the latch pin is held high. Device parameters
such as gain, offset, and negative power supply current
are not significantly affected by variations in negative
supply voltage.
APPLICATIO S
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High Speed A/D Converters
Zero Crossing Detectors
Current Sense for Switching Regulators
Extended Range V to F Converters
Fast Pulse Height/Width Discriminators
High Speed Triggers
Line Receivers
High Speed Sampling Circuits
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
V
IN
100mV STEP
5mV OVERDRIVE
Fast Current Comparator for
Current Mode Switching Regulator
LOGIC
5V
DRIVER
M1
Comparator Response Time
THRESHOLD
LT1116
–
Q
C1
R
SENSE
–
R1
OUTPUT
VOLTAGE V
OUT
1V/DIV
Q
+
12ns
0
0
20
TIME (ns)
BLANKING
CONTROL INPUT
LT1116 • TA01
U
12ns
20
LT1116 • TA02
U
U
1116fb
1
LT1116
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
+
1
+IN 2
–IN 3
V
–
4
8
–
Q OUT
Q OUT
GND
LATCH
ENABLE
V
+
1
+IN 2
–IN 3
V
–
4
TOP VIEW
8
Supply Voltage (V
+
) to GND ...................................... 7V
Negative Supply Voltage (V
–
) ...................... –7V to GND
Voltage
Differential Input Voltage ...................................
±15V
Inputs Voltage (Either Input) ......... (V
–
) –0.3V to 15V
Latch Pin Voltage ........................... Equal to Supplies
Output Current (Continuous) ..............................
±20mA
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
–
Q OUT
Q OUT
GND
LATCH
ENABLE
+
–
7
6
5
+
–
7
6
5
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 100°C,
θ
JA
= 130°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 100°C,
θ
JA
= 160°C/W
ORDER PART
NUMBER
LT1116CN8
ORDER PART
NUMBER
LT1116CS8
S8 PART MARKING
1116
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
∆V
OS
∆T
I
OS
l
B
PARAMETERS
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current, Sourcing
Input Voltage Range
CMRR
PSRR
A
V
I
+
I
–
V
OH
V
OL
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Small Signal Voltage Gain
Positive Supply Current
Negative Supply Current
Output High Voltage
Output Low Voltage
(Note 2)
(Note 3)
The
●
denotes the specifications which apply over full operating temperature
+
= 5V, V
–
= 5V, V
range, otherwise specifications are at T
A
= 25°C. V
OUT
(Q) = 1.4V, LATCH = 0V. Specifications for V
OS
, I
B
, CMRR, and
+
= 5V, V
–
= 0V, unless noted.
Voltage Gain are valid for single supply operation, V
CONDITIONS
R
S
≤
100Ω (Note 2)
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
1.0
5
0.5
10
MAX
±3.0
3.5
UNITS
mV
mV
µV/°C
2
20
(V
+
) –2.5
2.5
Arbitrary Supply Range
Single 5V Supply
–5V
≤
V
CM
≤
2.5V, V
S
=
±5V
0V
≤
V
CM
≤
2.5V
Positive Supply, 4.6V
≤
V
+
≤
5.4V
Negative Supply, –7
≤
V
–
≤
–2V
1V
≤
V
OUT
≤
2V
V
–
0
75
65
60
80
1400
90
90
75
100
3000
27
5
2.7
2.4
3.4
3.0
0.3
0.4
38
7
I
SOURCE
= 1mA
I
SOURCE
= 10mA
l
SINK
= 4mA
I
SINK
= 10mA
●
●
●
0.5
2
U
µA
µA
V
V
dB
dB
dB
dB
V/V
mA
mA
V
V
V
V
1116fb
W
U
U
W W
W
LT1116
The
●
denotes the specifications which apply over full operating temperature
range, otherwise specifications are at T
A
= 25°C. V = 5V, V
+
= –5V, V
OUT
= (Q) = I .4V, LATCH = 0V, unless noted.
SYMBOL
V
IH
V
IL
I
IL
t
PD
t
PD
∆t
PD
t
SU
t
H
PARAMETERS
+ Positive Latch Threshold
– Latch Threshold
Latch Input Current
Propagation Delay
Propagation Delay
Differential Propagation Delay
Latch Set-Up Time
Latch Hold Time
V
LATCH
= 0V
∆V
IN
= 100mV, OD = 5mV (Note 4)
●
ELECTRICAL CHARACTERISTICS
+
CONDITIONS
●
●
●
MIN
2.0
TYP
MAX
UNITS
V
0.8
–20
12
10
–500
16
18
14
16
3
2
2
V
µA
ns
ns
ns
ns
ns
ns
ns
∆V
IN
= 100mV, OD = 20mV (Note 4)
●
∆V
IN
= 100mV, OD = 5mV (Note 4)
(Note 5)
(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
reliabilty and lifetime.
Note 2:
Input offset voltage is defined as the average of two offset
voltages measured by forcing first the Q output to 1.4V then forcing
the Q output to 1.4V.
Note 3:
Input bias current is defined as the average of the two input
currents.
Note 4:
t
PD
and
∆t
PD
cannot be measured in automatic handling
equipment with low values of overdrive. The LT1116 is sample tested with
a 1V step and 500mV overdrive. Correlation tests have shown that t
PD
and
∆t
PD
can be guaranteed with this test if additional DC tests are performed
to verify internal bias conditions are correct. For low overdrive conditions
V
OS
is added to the measured overdrive.
Note 5:
Input latch set-up time, t
SU
, is the interval in which the input signal
must be stable prior to asserting the latch signal. The hold time,
t
H
, is the interval after the latch is asserted in which the input signal must
be stable.
TYPICAL PERFOR A CE CHARACTERISTICS
Gain CharacteristIcs
5.0
4.5
4.0
OUTPUT VOLTAGE (V)
T
J
= 125°C
3.5
DELAY (ns)
3.0
2.5
2.0
1.5
1.0
0.5
0
–2.5
T
J
= –55°C
DELAY (ns)
T
J
= 25°C
–1.5
1.5
– 0.5 0 0.5
DIFFERENTIAL INPUT VOLTAGE (mV)
U W
V
S
=
±5V
I
OUT
= 0
LT1116 • TPC01
Propagation Delay vs Overdrive
25
T
J
= 25°C
STEP SIZE = 100mV
20
18
16
14
15
t
PDLH
12
10
8
6
5
4
2
0
Propagation Delay
vs Load Capacitance
STEP = 100mV, OVERDRIVE = 5mV
20
t
PDHL
t
PDLH
10
t
PDHL
2.5
0
10
30
40
20
OVERDRIVE VOLTAGE (mV)
50
0
0
10
30
40
20
OUTPUT LOAD CAPACITANCE (pF)
50
LT1116 • TPC02
LT1116 • TPC03
1116fb
3
LT1116
TYPICAL PERFOR A CE CHARACTERISTICS
Propagation Delay
vs Source Resistance
80
70
60
STEP SIZE = 800mV
DELAY (ns)
20
t
PDHL
RISING OUTPUT
t
PDLH
FALLING OUTPUT
V
S
=
±5V,
OVERDRIVE = 20mV
DELAY (ns)
400mV
40
200mV
30
20
STEP SIZE = 100mV
10
0
0
0.5
2.0
2.5
1.5
SOURCE RESISTANCE (kΩ)
1.0
15
DELAY (ns)
50
Common Mode Rejection
120
110
V
IN
= 2V
P-P
V
S
=
±5V
T
J
= 25°C
REJECTION RATIO (dB)
TIME (ns)
90
80
70
60
50
40
10k
100k
1M
FREQUENCY (Hz)
10M
2
0
–2
–4
–6
50
100
–50 –25
25
75
0
JUNCTION TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
100
Output Low Voltage (V
OL
)
0.8
0.7
0.6
VOLTAGE (V)
V
S
=
±5V,
V
IN
= 30mV
0.5
0.4
0.3
0.2
0.1
0
0
2
T
J
= –55°C
T
J
= 25°C
T
J
= 125°C
CURRENT (mA)
20
15
10
NEGATIVE SUPPLY CURRENT
5
0
–60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (°C)
LT1116 • TPC11
CURRENT (mA)
4 6 8 10 12 14 16 18 20
OUTPUT SINK CURRENT (mA)
LT1116 • TPC10
4
U W
LT1116 • TPC04
LT1116 • TPC07
Propagation Delay
vs Positive Supply
25
Propagation Delay
vs Temperature
30
STEP = 100mV
OVERDRIVE = 5mV
25
C
LOAD
= 10pF
V
S
=
±5V
20
15
10
t
PDHL
t
PDLH
10
5
5
0
–50 –30 –10 10 30 50 70 90 110 130
JUNCTION TEMPERATURE (°C)
LT1116 • TPC06
0
3.0
4.4
4.8
5.0
5.2
5.4
4.6
POWER SUPPLY VOLTAGE (V)
5.6
LT1116 • TPC05
Latch Set-Up Time
6
4
Output High Voltage (V
OH
)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
125
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
0
2
4 6 8 10 12 14 16 18 20
OUTPUT SOURCE CURRENT (mA)
LT1116 • TPC09
LT1116 • TPC08
Supply Current vs Temperature
35
30
25
POSITIVE SUPPLY CURRENT
60
50
40
30
20
Positive Supply Current
V
–
= 0
T
J
= 125°C
10
T
J
= 25°C
T
J
= –55°C
0
0
6
2
4
POSITIVE SUPPLY VOLTAGE (V)
LT1116 • TPC12
8
1116fb
LT1116
TYPICAL PERFOR A CE CHARACTERISTICS
Positive Supply Current
50
45
40
35
CURRENT (mA)
30
25
20
15
10
5
0
1
10
SWITCHING FREQUENCY (MHz)
100
T
J
= –55°C
T
J
= 125°C
T
J
= 25°C
COMMON MODE VOLTAGE (V)
INPUT BIAS CURRENT (µA)
Negative Common Mode Limit
0
V
S
= 5V, OV
COMMON MODE VOLTAGE (V)
–1
–2
–3
–4
–5
V
S
=
±5V
1.4
1.0
0.6
0.2
50
100
25
75
–50 –25
0
JUNCTION TEMPERATURE (°C)
OUTPUT UNAFFECTED
CURRENT (µA)
VOLTAGE (V)
–6
– 60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (°C)
LT1116 • TPC16
TI I G DIAGRA S
V
OD
LATCH
ENABLE
t
SU
t
H
V
IN
∆V
IN
t
PD
V
OUT
LT1116 • TD01
U W
LT1116 • TPC13
Input Bias Current
10
T
J
= 25°C
V
S
=
±5V
5
Positive Common Mode Limit
V
S
=
±5V
0
4
–10
3
– 20
2
– 30
1
– 40
–6
–4
0
–2
INPUT VOLTAGE (V)
2
4
0
– 60 – 40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (°C)
LT1116 • TPC15
LT1116 • TPC14
Latch Pin Threshold
2.6
2.2
1.8
OUTPUT LATCHED
Latch Pin Current*
300
250
200
150
100
50
0
50
100
–50 –25
25
75
0
JUNCTION TEMPERATURE (°C)
*CURRENT COMES OUT OF LATCH PIN
BELOW THRESHOLD
V
S
=
±5V
125
125
LT1116 • TPC17
LT1116 • TPC18
W
UW
V
IN
t
PD
V
OUT
LT1116 • TD02
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