FEATURES
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LT1797
10MHz, Rail-to-Rail
Input and Output
Op Amp in SOT-23
DESCRIPTION
The LT
®
1797 is a unity-gain stable 10MHz op amp available
in the small SOT-23 package that operates on all single
and split supplies with a total voltage of 2.7V to 12V. The
amplifier draws 1mA of quiescent current and has a slew
rate of 2.25V/μs.
The input common mode range of the LT1797 includes
both rails, making it ideal for current sensing applications.
The input stage incorporates phase reversal protection
to prevent false outputs from occurring when the inputs
are driven beyond the supplies. Protective resistors are
included in the input leads so that current does not become
excessive when the inputs are forced above or below the
supplies.
The output of the LT1797 can swing to within 50mV of V
+
and 8mV of V
–
without drawing excess current in either
condition. The amplifier can drive loads up to 25mA and
still maintain rail-to-rail capability.
The LT1797 op amp is available in the space saving 5-lead
SOT-23 package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and Over-The-Top are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Rail-to-Rail Input and Output
Small SOT-23 Package
Gain Bandwidth Product: 10MHz
–40°C to 85°C Operation
Slew Rate: 2.25V/μs
Low Input Offset Voltage: 1.5mV Max
High Output Current: 25mA Min
Specified on 3V, 5V and ±5V Supplies
High Voltage Gain: 1000V/mV 10k Load
High CMRR: 96dB Typ
High PSRR: 90dB Typ
Input Bias Current: 300nA Max
Input Offset Current: 25nA Max
Low Profile (1mm) SOT-23 (ThinSOT™) Package
APPLICATIONS
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Portable Instrumentation
Rail-to-Rail Buffer Amplifiers
Low Voltage Signal Processing
Driving A/D Converters
Battery-Powered Systems
TYPICAL APPLICATION
Fast Compact –48V Current Sense
V
OUT
= 3V – 0.1Ω • I
SENSE
I
SENSE
= 0A TO 30A
ACCURACY ≈ 3%
V
OUT
Q1
FMMT493
30.1Ω
1%
3.3k
0805
3
R1
4.7k
1k
1%
V
S
= 3V
Small-Signal Response
BZX84C6V8
V
Z
= 6.8V
–48V SUPPLY
(–42V TO –56V)
0.003Ω
1% 3W
–
I
SENSE
+
+
1797 TA01
–
LT1797
0.1μF
–48V LOAD
R1 REDUCES Q1 DISSIPATION
1797 TA01b
SETTLES TO 1% IN 2μs,
1V OUTPUT STEP
V
S
= ±2.5V
A
V
= 1
R
L
= 10k
1797fb
1
LT1797
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
OUT 1
V
–
2
+IN 3
+ –
Total Supply Voltage (V
+
to V
–
) .............................. 12.6V
Input Differential Voltage ....................................... 12.6V
Input Current........................................................ ±10mA
Output Short-Circuit Duration (Note 2) ........ Continuous
Operating Temperature Range (Note 3) ...–40°C to 85°C
Specified Temperature Range ..................–40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
5
V
+
4
–IN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1797CS5#PBF
LT1797IS5#PBF
TAPE AND REEL
LT1797CS5#TRPBF
LT1797IS5#TRPBF
PART MARKING
LTLM
LTTL
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard 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/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 3V, 0V; V
S
= 5V, 0V, V
CM
= V
OUT
= half supply, pulse power tested,
unless otherwise specified. (Note 3)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
Input Offset Voltage Drift (Note 4)
I
B
Input Bias Current
Input Bias Current Drift
I
OS
Input Offset Current
Input Noise Voltage
e
n
i
n
R
IN
C
IN
CMRR
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Common Mode Rejection Ratio
V
CM
= 0V to V
S
– 1.3V
V
S
= 5V, V
CM
= 0V to 5V
V
S
= 3V, V
CM
= 0V to 3V
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ELECTRICAL CHARACTERISTICS
CONDITIONS
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MIN
TYP
1
MAX
1.5
2.5
3.0
20
100
25
25
UNITS
mV
mV
mV
μV/°C
nA
nA
nA/°C
nA
nA
μV
P-P
nV/√Hz
pA/√Hz
pA/√Hz
kΩ
MΩ
pF
dB
dB
dB
1797fb
5
–300
–150
50
0.1
10
10
1.5
20
0.23
0.15
200
330
100
4
82
64
60
96
72
68
V
CM
= V
–
V
CM
= V
+
V
CM
= V
–
V
CM
= V
+
0.1Hz to 10Hz
f = 10kHz
f = 10kHz
f = 10kHz, V
CM
= V
CC
– 0.3V
Differential
Common Mode, V
CM
= 0V to V
S
– 1.3V
2
LT1797
ELECTRICAL CHARACTERISTICS
SYMBOL
A
VOL
PARAMETER
Input Voltage Range
Large-Signal Voltage Gain
V
S
= 3V, V
O
= 0.5V to 2.5V, R
L
= 10k
V
S
= 5V, V
O
= 0.5V to 4.5V, R
L
= 10k
PSRR
V
OL
Power Supply Rejection Ratio
Minimum Supply Voltage
Output Voltage Swing LOW
No Load, Input Overdrive = 30mV
I
SINK
= 5mA
I
SINK
= 10mA
No Load, Input Overdrive = 30mV
I
SOURCE
= 5mA
I
SOURCE
= 10mA, V
S
= 5V
I
SOURCE
= 10mA, V
S
= 3V
V
S
= 5V
V
S
= 3V
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 3V, 0V; V
S
= 5V, 0V, V
CM
= V
OUT
= half supply, pulse power tested,
unless otherwise specified. (Note 3)
CONDITIONS
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MIN
0
200
150
400
300
80
TYP
1000
1000
90
2.5
8
80
150
MAX
V
S
UNITS
V
V/mV
V/mV
V/mV
V/mV
dB
V
S
= 2.7V to 12V, V
CM
= V
O
= 1V
2.7
30
160
250
V
mV
mV
mV
V
V
V
V
mA
mA
V
OH
Output Voltage Swing HIGH
V
S
– 0.14 V
S
– 0.05
V
S
– 0.30 V
S
– 0.2
V
S
– 0.39 V
S
– 0.3
V
S
– 0.59 V
S
– 0.3
25
15
45
25
1.1
6.0
5.0
4.5
1.3
1.1
1.0
10
1.5
2.0
I
SC
I
S
GBW
Short-Circuit Current
Supply Current
Gain Bandwidth Product (Note 5)
mA
mA
MHz
MHz
MHz
V/μs
V/μs
V/μs
ns
ns
μs
%
kHz
f = 100kHz
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
A
V
= –1
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
10% to 90%, 0.1V Step, R
L
= 10k
10% to 90%, 0.1V Step, R
L
= 10k
V
S
= 5V, ΔV
OUT
= 2V to 0.1%, A
V
= –1
V
S
= 3V, V
OUT
= 1.8V
P-P
, A
V
= 1, R
L
= 10k, f = 1kHz
V
OUT
= 2V
P-P
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SR
Slew Rate (Note 5)
2.25
t
r
t
f
t
S
THD
FPBW
Output Rise Time
Output Fall Time
Settling Time
Distortion
Full-Power Bandwidth (Note 6)
55
55
1.6
0.001
360
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= ±5V, V
CM
= 0V, V
OUT
= 0V, pulse power tested unless otherwise specified. (Note 3)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
Input Offset Voltage Drift (Note 4)
I
B
Input Bias Current
Input Bias Current Drift
I
OS
Input Offset Current
Input Noise Voltage
e
n
i
n
Input Noise Voltage Density
Input Noise Current Density
V
CM
= V
–
V
CM
= V
+
0.1Hz to 10Hz
f = 10kHz
f = 10kHz
f = 10kHz, V
CM
= 4.7V
V
CM
= V
–
V
CM
= V
+
CONDITIONS
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MIN
TYP
1
MAX
1.5
2.5
3.0
20
100
25
25
UNITS
mV
mV
mV
μV/°C
nA
nA
nA/°C
nA
nA
μV
P-P
nV/√Hz
pA/√Hz
pA/√Hz
1797fb
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–300
–150
50
0.1
10
10
1
20
0.23
0.15
3
LT1797
ELECTRICAL CHARACTERISTICS
SYMBOL
R
IN
C
IN
CMRR
A
VOL
V
OL
PARAMETER
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing LOW
V
CM
= –5V to 3.7V
V
CM
= –5V to 5V
V
O
= ±4V, R
L
= 10k
No Load, Input Overdrive = 30mV
I
SINK
= 5mA
I
SINK
= 10mA
No Load, Input Overdrive = 30mV
I
SOURCE
= 5mA
I
SOURCE
= 10mA
Short to GND
V
S
= ±1.35V to ±6V
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The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
S
= ±5V, V
CM
= 0V, V
OUT
= 0V, pulse power tested unless otherwise
specified. (Note 3)
CONDITIONS
Differential
Common Mode, V
CM
= –5V to 3.7V
MIN
200
TYP
330
100
4
–5
78
66
400
300
96
76
1000
–4.99
–4.92
–4.85
4.84
4.70
4.61
30
80
4.95
4.80
4.70
50
90
1.40
6.5
5.5
5.0
1.50
1.25
1.10
11
2.25
3.00
–4.97
–4.87
–4.79
5
MAX
UNITS
kΩ
MΩ
pF
V
dB
dB
V/mV
V/mV
V
V
V
V
V
V
mA
dB
mA
mA
MHz
MHz
MHz
V/μs
V/μs
V/μs
ns
ns
μs
kHz
V
OH
Output Voltage Swing HIGH
I
SC
PSRR
I
S
GBW
Short-Circuit Current (Note 2)
Power Supply Rejection Ratio
Supply Current
Gain Bandwidth Product
f = 100kHz
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
A
V
= –1, RL = ∞, V
O
= ±4V, Measured at V
O
= ±2V
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
10% to 90%, 0.1V Step, R
L
= 10k
10% to 90%, 0.1V Step, R
L
= 10k
ΔV
OUT
= 4V to 0.1%, A
V
= 1
V
OUT
= 8V
P-P
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SR
Slew Rate
2.50
t
r
t
f
t
S
FPBW
Output Rise Time
Output Fall Time
Settling Time
Full-Power Bandwidth (Note 6)
55
55
2.6
100
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.
Note 2:
A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 3:
The LT1797C is guaranteed to meet 0°C to 70°C specifications and
is designed, characterized and expected to meet the extended temperature
limits, but is not tested at –40°C and 85°C. The LT1797I is guaranteed to
meet specified performance from –40°C to 85°C.
Note 4:
This parameter is not 100% tested.
Note 5:
V
S
= 3V limit guaranteed by correlation to 5V tests.
Note 6:
Full-power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP
1797fb
4
LT1797
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
1.8
1.6
SUPPLY CURRENT (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2 3 4 5 6 7 8 9 10 11 12
TOTAL SUPPLY VOLTAGE (V)
1797 G01
Minimum Supply Voltage
300
100
50
INPUT BIAS CURRENT (nA)
0
–50
–100
–150
–200
INPUT OFFSET VOLTAGE CHANGE (μV)
200
100
0
–100
–200
–300
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
TOTAL SUPPLY VOLTAGE (V)
1797 G02
Input Bias Current
vs Common Mode Voltage
V
S
= 5V, 0V
T
A
= 125°C
T
A
= –55°C
T
A
= 25°C
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
COMMON MODE VOLTAGE (V)
1797 G03
Output Saturation Voltage
vs Load Current (Output High)
1
OUTPUT SATURATION VOLTAGE (V)
OUTPUT SATURATION VOLTAGE (V)
V
S
= ±2.5V
V
OD
= 30mV
1
Output Saturation Voltage
vs Load Current (Output Low)
OUTPUT SATURATION VOLTAGE (mV)
V
S
= ±2.5V
V
OD
= 30mV
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Output Saturation Voltage
vs Input Overdrive
V
S
= ±2.5V
I
OUT
= 0
0.1
0.1
T
A
= 25°C
T
A
= 125°C
T
A
= –55°C
0.01
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
OUTPUT HIGH
OUTPUT LOW
0
10 20 30 40 50 60 70 80 90 100
INPUT OVERDRIVE (mV)
1797 G06
0.01
1μ
0.001
10μ
100μ
1m
SOURCING LOAD CURRENT (A)
10m
1797 G04
1μ
10μ
100μ
1m
SINKING LOAD CURRENT (A)
10m
1797 G05
Output Short-Circuit Current
vs Temperature
50
45
OUTPUT CURRENT (mA)
40
SINKING CURRENT
35
30
25
20
–50 –25
V
S
= ±2.5V
SOURCING CURRENT
NOISE VOLTAGE (1μV/DIV)
0.1Hz to 10Hz Noise Voltage
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
V
S
= ±5V
100
Input Noise Voltage Density
vs Frequency
V
S
= ±2.5V
80
60
40
20
0
50
25
75
0
TEMPERATURE (°C)
100
125
0
1
2
3
4 5 6
TIME (SEC)
7
8
9
10
10
100
1k
10k
FREQUENCY (Hz)
100k
1797 G09
1797 G07
1797 G08
1797fb
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