FEATURES
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LT1784
2.5MHz, Over-The-Top
Low Power, Rail-to-Rail Input
and Output Op Amp in SOT-23
DESCRIPTION
The LT
®
1784 is a 2.5MHz op amp available in the small
SOT-23 package that operates on all single and split supplies
with a total voltage of 2.5V to 18V. The amplifier draws less
than 750μA of quiescent current and has reverse battery
protection, drawing negligible current for reverse supply
voltages up to 18V.
The input range of the LT1784 includes ground, and a
unique feature of this device is its Over-The-Top
®
opera-
tion capabilitity with either or both of its inputs above the
positive rail. The inputs handle 18V both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring even when the inputs are 9V
below the negative supply.
The LT1784 can drive loads up to 15mA and still maintain
rail-to-rail capability. A shutdown feature on the 6-lead
version can disable the part, making the output high
impedance and reducing quiescent current to 5μA. The
LT1784 op amp is available in the 5- and 6-lead SOT-23
packages. For applications requiring lower power, refer to
the LT1782 and LT1783 data sheets.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Over-The-Top are registered
trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Operates with Inputs Above V
+
Rail-to-Rail Input and Output
Gain Bandwidth Product: 2.5MHz
Slew Rate: 2.1V/μs
Low Input Offset Voltage: 3.5mV Max
High Voltage Gain: 1000V/mV
Single Supply Input Range: 0V to 18V
Specified on 3V, 5V and ±5V Supplies
Reverse Battery Protection to 18V
Low Power: 750μA Supply Current Max
Output Shutdown on 6-Lead Version
High Output Current: 15mA Min
Operating Temperature Range: –40°C to 85°C
Low Profile (1mm) ThinSOT™ Package
APPLICATIONS
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Portable Instrumentation
Battery-Powered Systems
Sensor Conditioning
Supply Current Sensing
MUX Amplifiers
4mA to 20mA Transmitters
TYPICAL APPLICATION
Programmable Gain, A
V
= 2, A
V
= 20, 100kHz Amplifier
V
CC
A
V
= 20
A
V
= 2
SHDN
IN
SHDN
V
CC
V
CC
Programmable Gain Amplifier
Frequency Response
30
25
20
15
A
V
= 20
+
LT1784
OUT
GAIN (dB)
10
5
0
–5
–10
A
V
= 2
–
V
EE
+
LT1782
–
V
EE
R1
R2
10k
9.09k
R3
1k
A
V
= 1+
OR 1+
(
(
R1 + R2
R3
R1
R2 + R3
)
)
1784 TA01a
–15
–20
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1784 TA01b
1784fa
1
LT1784
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V
+
to V
–
) .................................18V
Input Differential Voltage ..........................................18V
Input Pin Voltage to V
–
................................ +24V/–10V
Shutdown Pin Voltage Above V
–
..............................18V
Shutdown Pin Current .........................................±10mA
Output Short-Circuit Duration (Note 2) ............ Indefinite
Operating Temperature Range (Note 10).. –40°C to 85°C
Specified Temperature Range (Note 11) .. –40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
OUT 1
V
–
2
+IN 3
+ –
TOP VIEW
5 V
+
OUT 1
V
–
2
4 –IN
+IN 3
+ –
+
6 V
5 SHDN
4 –IN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/W
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 230°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1784CS5#PBF
LT1784IS5#PBF
LT1784CS6#PBF
LT1784IS6#PBF
TAPE AND REEL
LT1784CS5#TRPBF
LT1784IS5#TRPBF
LT1784CS6#TRPBF
LT1784IS6#TRPBF
PART MARKING
LTJD
LTSN
LTIW
LTIX
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
SPECIFIED TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–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 specified
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 3V, 0V; V
S
= 5V, 0V, V
CM
= V
OUT
= half supply, for the 6-lead part
V
PIN5
= 0V, pulse power tested unless otherwise specified.
SYMBOL
V
OS
ΔV
OS
/ΔT
I
OS
PARAMETER
Input Offset Voltage
CONDITIONS
T
A
= 25°C
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 85°C
V
CM
= 18V (Note 3)
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l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
1.5
MAX
3.5
4.2
4.5
15
50
50
UNITS
mV
mV
mV
μV/°C
nA
μA
Input Offset Voltage Drift (Note 7)
Input Offset Current
5
25
1784fa
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LT1784
ELECTRICAL CHARACTERISTICS
SYMBOL
I
B
ΔI
B
/ΔT
e
n
i
n
R
IN
PARAMETER
Input Bias Current
V
CM
= 18V (Note 3)
SHDN or V
S
= 0V, V
CM
= 0V to 18V
–40°C ≤ T
A
≤ 85°C
0.1Hz to 10Hz
f = 10kHz
f = 10kHz
Differential
Common Mode, V
CM
= 0V to (V
CC
– 1.2V)
Common Mode, V
CM
= 0V to 18V
l
The
l
denotes the specifications which apply over the specified
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 3V, 0V; V
S
= 5V, 0V, V
CM
= V
OUT
= half supply, for the 6-lead part
V
PIN5
= 0V, pulse power tested unless otherwise specified.
CONDITIONS
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l
l
MIN
TYP
250
225
0.1
0.4
1.5
25
0.3
200
150
80
5
MAX
500
400
UNITS
nA
μA
nA
nA/°C
μV
P-P
nV/√Hz
pA/√Hz
kΩ
MΩ
kΩ
pF
V
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
mV
mV
mV
V
V
V
V
mA
mA
mA
mA
V
V
μA
μA
μA
nA
μA
μA
μA
μA
V
V
μs
μs
Input Bias Current Drift
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
100
45
0
84
60
90
133
90
60
266
180
120
C
IN
V
CM
CMRR
PSRR
A
VOL
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
(Note 3)
Power Supply Rejection Ratio
Large-Signal Voltage Gain
18
95
70
100
1000
V
OL
Output Voltage Swing LOW
V
OH
Output Voltage Swing HIGH
I
SC
Short-Circuit Current (Note 2)
V
CM
= 0V to V
CC
– 1.2V
V
CM
= 0V to 18V (Note 6)
V
S
= 3V to 12.5V, V
CM
= V
O
= 1V
V
S
= 3V, V
O
= 500mV to 2.5V, R
L
= 10k
V
S
= 3V, 0°C ≤ T
A
≤ 70°C
V
S
= 3V, –40°C ≤ T
A
≤ 85°C
V
S
= 5V, V
O
= 500mV to 4.5V, R
L
= 10k
V
S
= 5V, 0°C ≤ T
A
≤ 70°C
V
S
= 5V, –40°C ≤ T
A
≤ 85°C
No Load
I
SINK
= 5mA
V
S
= 5V, I
SINK
= 10mA
V
S
= 3V, No Load
V
S
= 3V, I
SOURCE
= 3mA
V
S
= 5V, No Load
V
S
= 5V, I
SOURCE
= 10mA
V
S
= 3V, Short to GND
V
S
= 3V, Short to V
CC
V
S
= 5V, Short to GND
V
S
= 5V, Short to V
CC
I
S
= –100μA
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l
1000
2.885
2.600
l
4.885
l
4.400
4
15
12.5
20.0
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l
l
I
S
I
SHDN
Minimum Supply Voltage
Reverse Supply Voltage
Supply Current
(Note 4)
Supply Current, Shutdown
SHDN Pin Current
4
200
350
2.93
2.8
4.93
4.7
7.5
30
22
40
2.5
500
7
0.5
2.0
5.0
0.05
10
10
400
600
2.7
750
900
18
8
1
30
0.3
18
V
PIN5
= 2V, No Load (Note 8)
V
PIN5
= 0.3V (On), No Load (Note 8)
V
PIN5
= 2V (Shutdown), No Load (Note 8)
V
PIN5
= 5V (Shutdown), No Load (Note 8)
V
PIN5
= 2V, No Load (Note 8)
V
PIN5
= 18V, No Load (Note 8)
(Note 8)
(Note 8)
V
PIN5
= 5V to 0V, R
L
= 10k (Note 8)
V
PIN5
= 0V to 5V, R
L
= 10k (Note 8)
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l
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l
V
IL
V
IH
t
ON
t
OFF
Output Leakage Current, Shutdown
Maximum SHDN Pin Current
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
Turn-On Time
Turn-Off Time
2
18
2.2
1784fa
3
LT1784
ELECTRICAL CHARACTERISTICS
SYMBOL
GBW
PARAMETER
Gain Bandwidth Product
(Note 4)
Slew Rate
(Note 5)
Full-Power Bandwidth (Note 9)
Settling Time
Distortion
The
l
denotes the specifications which apply over the specified
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 3V, 0V; V
S
= 5V, 0V, V
CM
= V
OUT
= half supply, for the 6-lead part
V
PIN5
= 0V, pulse power tested unless otherwise specified.
CONDITIONS
f = 5kHz
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
A
V
= –1, R
L
=
∞
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
V
OUT
= 2V
P-P
V
S
= 5V,
ΔV
OUT
= 2V to 0.1%, A
V
= –1
V
S
= 3V, V
O
= 1.8V
P-P
, A
V
= 1, R
L
= 10k, f = 1kHz
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MIN
1.5
1.2
1.1
1.2
1.1
1.0
TYP
2.5
MAX
UNITS
MHz
MHz
MHz
V/μs
V/μs
V/μs
kHz
μs
%
SR
2.1
FPBW
t
S
THD
350
3.7
0.001
The
l
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= ±5V, V
CM
= 0V, V
OUT
= 0V, for the 6-lead part V
PIN5
= V
–
, pulse power tested unless otherwise specified.
SYMBOL
V
OS
ΔV
OS
/ΔT
I
OS
I
B
ΔI
B
/ΔT
e
n
i
n
R
IN
C
IN
V
CM
CMRR
A
VOL
V
OL
PARAMETER
Input Offset Voltage
CONDITIONS
T
A
= 25°C
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 85°C
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l
l
l
l
MIN
TYP
1.6
MAX
3.75
4.50
4.80
15
50
500
UNITS
mV
mV
mV
μV/°C
nA
nA
nA/°C
μV
P-P
nV/√Hz
pA/√Hz
kΩ
kΩ
pF
V
dB
V/mV
V/mV
V
V
V
V
V
V
mA
mA
dB
μA
μA
μA
nA
μA
μA
μA
1784fa
Input Offset Voltage Drift (Note 7)
Input Offset Current
Input Bias Current
Input Bias Current Drift
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing LOW
5
25
250
0.4
1.5
25
0.3
200
80
5
0°C ≤ T
A
≤ 70°C
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= –5V to 13V
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l
l
l
100
45
–5
60
50
35
13
70
100
–4.996
–4.800
–4.650
4.92
4.75
4.65
27
100
540
8
0.5
2.0
10
0.05
–4.99
–4.60
–4.40
V
OH
Output Voltage Swing HIGH
I
SC
PSRR
I
S
Short-Circuit Current (Note 2)
Power Supply Rejection Ratio
Supply Current
Supply Current, Shutdown
SHDN Pin Current
Maximum SHDN Pin Current
Output Leakage Current, Shutdown
V
CM
= –5V to 13V
V
O
= ±4V, R
L
= 10k
0°C ≤ T
A
≤ 70°C
No Load
I
SINK
= 5mA
I
SINK
= 10mA
No Load
I
SOURCE
= 5mA
I
SOURCE
= 10mA
Short to GND
0°C ≤ T
A
≤ 70°C
V
S
= ±1.5V to ±9V
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l
l
l
l
l
l
4.885
4.550
4.400
15
l
10
l
90
l
I
SHDN
V
PIN5
= –3V, V
S
= ±5V, No Load (Note 8)
V
PIN5
= –4.7V (On), V
S
= ±5V, No Load (Note 8)
V
PIN5
= –3V (Shutdown), V
S
= ±5V, No Load (Note 8)
V
PIN5
= 9V, V
S
= ±9V (Note 8)
V
PIN5
= –7V, V
S
= ±9V, No Load (Note 8)
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l
l
800
975
20
8
30
1
4
LT1784
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IL
V
IH
t
ON
t
OFF
GBW
PARAMETER
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
Turn-On Time
Turn-Off Time
Gain Bandwidth Product
The
l
denotes the specifications which apply over the specified
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= ±5V, V
CM
= 0V, V
OUT
= 0V, for the 6-lead part V
PIN5
= V
–
,
pulse power tested unless otherwise specified.
CONDITIONS
V
S
= ±5V (Note 8)
V
S
= ±5V (Note 8)
V
PIN5
= 0V to –5V, R
L
= 10k (Note 8)
V
PIN5
= –5V to 0V, R
L
= 10k (Note 8)
f = 5kHz
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
V
OUT
= 8V
P-P
V
S
= 5V,
ΔV
OUT
= 4V to 0.1%, A
V
= 1
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MIN
–3
TYP
MAX
–4.7
UNITS
V
V
μs
μs
MHz
MHz
MHz
V/μs
V/μs
V/μs
kHz
μs
SR
Slew Rate
1.55
1.30
1.20
1.3
1.2
1.1
18
2.2
2.6
2.2
FPBW
t
S
Full-Power Bandwidth (Note 9)
Settling Time
94
3.4
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:
V
S
= 5V limits are guaranteed by correlation to V
S
= 3V and
V
S
= ±5V or V
S
= ±9V tests.
Note 4:
V
S
= 3V limits are guaranteed by correlation to V
S
= 5V and
V
S
= ±5V or V
S
= ±9V tests.
Note 5:
Guaranteed by correlation to slew rate at V
S
= ±5V, and GBW at
V
S
= 5V and V
S
= ±5V tests.
Note 6:
This specification implies a typical input offset voltage of 5.7mV at
V
CM
= 18V and a maximum input offset voltage of 18mV at V
CM
= 18V.
Note 7:
This parameter is not 100% tested.
Note 8:
Specifications apply to 6-lead SOT-23 with shutdown.
Note 9:
Full-power bandwidth is calculated from the slew rate.
FPBW = SR/2πV
P
.
Note 10:
The LT1784C is guaranteed functional over the operating
temperature range –40°C to 85°C.
Note 11:
The LT1784C is guaranteed to meet specified performance from
0°C to 70°C. The LT1784C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. LT1784I is guaranteed to meet specified
performance from –40°C to 85°C.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
700
INPUT OFFSET VOLTAGE CHANGE (μV)
650
SUPPLY CURRENT (μA)
600
550
500
450
400
350
300
2
4
6
8 10 12 14
SUPPLY VOLTAGE (V)
16
18
T
A
= –55°C
T
A
= 125°C
T
A
= 25°C
400
300
4
200
V
OUT
(V)
100
0
–100
–200
–300
–400
1
3
2
4
TOTAL SUPPLY VOLTAGE (V)
5
1784 G02
Minimum Supply Voltage
5
Output Voltage
vs Large Input Voltage
V
S
= 5V, 0V
T
A
= 125°C
T
A
= –55°C
T
A
= 25°C
3
2
V
IN
1
+
–
5V
0
–10
–6
–2
6
2
V
IN
(V)
10
14
18
1784 G01
1784 G03
1784fa
5
51单片机
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