LT1797
10MHz, Rail-to-Rail
Input and Output
Op Amp in SOT-23
FEATURES
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DESCRIPTIO
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: 88dB Min
High PSRR: 80dB Min
Input Bias Current: 300nA Max
Input Offset Current: 25nA Max
The LT
®
1797 is a unity-gain stable 10MHz op amp avail-
able 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 in-
cluded 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
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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
R1 REDUCES Q1 DISSIPATION
LT1797
0.1µF
SETTLES TO 1% IN 2µs,
1V OUTPUT STEP
BZX84C6V8
V
Z
= 6.8V
–48V SUPPLY
(–42V TO –56V)
0.003Ω
1% 3W
–
I
SENSE
+
1797 TA01
–48V LOAD
U
+
–
U
U
1
LT1797
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
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
ORDER PART
NUMBER
5
V
+
LT1797CS5
LT1797IS5
S5 PART MARKING
LTLM
LTTL
4
–IN
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the specified temperature range, otherwise specifications are 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 PARAMETER
V
OS
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
Input Voltage Range
A
VOL
Large-Signal Voltage Gain
V
S
= 3V, V
O
= 0.5V to 2.5V, R
L
= 10k
q
q
q
q
CONDITIONS
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
5
–300
–150
50
0.1
10
10
1.5
20
0.23
0.15
200
330
100
4
96
72
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
– 1.2V
V
CM
= 0V to V
S
– 1.2V
V
CM
= 0V to V
S
q
q
q
q
q
q
q
q
88
64
0
200
150
400
300
V
S
1000
1000
V/mV
V/mV
V/mV
V/mV
V
S
= 5V, V
O
= 0.5V to 4.5V, R
L
= 10k
q
2
U
V
W
U
U
W W
W
LT1797
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the specified temperature range, otherwise specifications are 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 PARAMETER
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
V
S
= 3V
q
CONDITIONS
V
S
= 2.7V to 12V, V
CM
= V
O
= 1V
q
q
q
q
q
MIN
80
TYP
90
2.5
8
80
150
MAX
2.7
15
160
250
UNITS
dB
V
mV
mV
mV
V
V
V
mA
mA
V
OH
Output Voltage Swing HIGH
q
V
S
– 0.14 V
S
– 0.05
q
V
S
– 0.30 V
S
– 0.2
q
V
S
– 0.39 V
S
– 0.3
I
SC
I
S
GBW
Short-Circuit Current
Supply Current
Gain Bandwidth Product (Note 5)
25
15
45
25
1.1
1.5
2.0
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,
∆V
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
q
q
q
q
6.0
5.0
4.5
1.3
1.1
1.0
10
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
q
denotes specifications which apply over the specified temperature range, otherwise specifications are T
A
= 25°C.
V
S
=
±5V,
V
CM
= 0V, V
OUT
= 0V, pulse power tested unless otherwise specified. (Note 3)
SYMBOL PARAMETER
V
OS
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
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
q
q
q
q
CONDITIONS
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
5
–300
–150
50
0.1
10
10
1
20
0.23
0.15
200
330
100
4
–5
V
CM
= V
–
V
CM
= V
+
V
CM
= V
–
V
CM
= V
+
0.1Hz to 10Hz
f = 10kHz
f = 10kHz
f = 10kHz, V
CM
= 4.7V
Differential
Common Mode, V
CM
= – 5V to 3.8V
q
q
q
q
q
5
V
3
LT1797
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the specified temperature range, otherwise specifications are T
A
= 25°C.
V
S
=
±5V,
V
CM
= 0V,V
OUT
= 0V, pulse power tested unless otherwise specified. (Note 3)
SYMBOL PARAMETER
CMRR
A
VOL
V
OL
Common Mode Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing LOW
CONDITIONS
V
CM
= – 5V to 3.8V
V
CM
= – 5V to 5V
V
O
=
±4V,
R
L
= 10k
q
q
q
MIN
83
66
400
300
TYP
96
76
1000
– 4.99
– 4.92
– 4.85
MAX
UNITS
dB
dB
V/mV
V/mV
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
q
q
q
q
q
q
– 4.98
– 4.87
– 4.79
V
V
V
V
V
V
mA
dB
V
OH
Output Voltage Swing HIGH
4.84
4.70
4.61
30
80
4.95
4.80
4.70
50
90
1.40
2.25
2.70
I
SC
PSRR
I
S
GBW
Short-Circuit Current (Note 2)
Power Supply Rejection Ratio
Supply Current
q
q
mA
mA
MHz
MHz
MHz
V/µs
V/µs
V/µs
ns
ns
µs
kHz
Gain Bandwidth Product
f = 100kHz
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
A
V
= – 1, R
L
=
∞,
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
∆V
OUT
= 4V to 0.1%, A
V
= 1
V
OUT
= 8V
P-P
q
q
q
q
6.5
5.5
5.0
1.50
1.25
1.10
11
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:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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/2πV
P
4
LT1797
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
1.8
1.6
T
A
= 125°C
INPUT OFFSET VOLTAGE CHANGE (µV)
INPUT BIAS CURRENT (nA)
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
T
A
= 25°C
T
A
= –55°C
Output Saturation Voltage
vs Load Current (Output High)
1
OUTPUT SATURATION VOLTAGE (V)
V
S
=
±2.5V
V
OD
= 30mV
OUTPUT SATURATION VOLTAGE (V)
0.1
0.1
T
A
= 25°C
T
A
= 125°C
T
A
= –55°C
OUTPUT SATURATION VOLTAGE (mV)
0.01
1µ
10µ
100µ
1m
SOURCING LOAD CURRENT (A)
Output Short-Circuit Current
vs Temperature
50
45
OUTPUT CURRENT (mA)
SOURCING CURRENT
NOISE VOLTAGE (1µV/DIV)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
V
S
=
±2.5V
40
SINKING CURRENT
35
30
25
20
–50 –25
50
25
75
0
TEMPERATURE (°C)
U W
1797 G04
Minimum Supply Voltage
300
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
100
50
0
–50
–100
–150
–200
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
V
S
= 5V, 0V
T
A
= –55°C
T
A
= 25°C
T
A
= 125°C
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
Output Saturation Voltage
vs Load Current (Output Low)
1
V
S
=
±2.5V
V
OD
= 30mV
Output Saturation Voltage
vs Input Overdrive
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
V
S
=
±2.5V
I
OUT
= 0
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
10m
0.001
1µ
100µ
1m
10µ
SINKING LOAD CURRENT (A)
10m
1797 G05
0.1Hz to 10Hz Noise Voltage
V
S
=
±5V
100
Input Noise Voltage Density
vs Frequency
V
S
=
±2.5V
80
60
40
20
0
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
5
嵌入式系统
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