FEATURES
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LT1784
2.5MHz, Over-The-Top
Low Power, Rail-to-Rail Input
and Output Op Amp in SOT-23
DESCRIPTIO
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
TM
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top and ThinSOT are trademarks of Linear Technology Corporation.
Operates with Inputs Above V
+
Rail-to-Rail Input and Output
Low Profile (1mm) ThinSOT
TM
Package
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
APPLICATIO S
s
s
s
s
s
s
Portable Instrumentation
Battery-Powered Systems
Sensor Conditioning
Supply Current Sensing
MUX Amplifiers
4mA to 20mA Transmitters
TYPICAL APPLICATIO
V
CC
A
V
= 20
A
V
= 2
SHDN
IN
SHDN
V
CC
Programmable Gain, A
V
= 2, A
V
= 20, 100kHz Amplifier
Programmable Gain Amplifier
Frequency Response
30
25
A
V
= 20
V
CC
20
15
+
LT1784
OUT
GAIN (dB)
10
5
0
–5
A
V
= 2
–
V
EE
+
LT1782
–
V
EE
R2
9.09k
R3
1k
R1
10k
A
V
= 1+
OR
1+
(
(
R1 + R2
R3
R1
R2 + R3
)
)
1784 TA01
–10
–15
–20
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1784 TA01a
U
U
U
1
LT1784
ABSOLUTE
MAXIMUM
RATINGS
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
PACKAGE/ORDER INFORMATION
TOP VIEW
OUT 1
V
–
2
+IN 3
+ –
ORDER PART
NUMBER
5 V
+
OUT 1
4 –IN
LT1784CS5
LT1784IS5
S5 PART MARKING
LTJD
LTSN
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
Consult LTC marketing 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, for the 6-lead part V
PIN5
= 0V, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
V
OS
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)
I
B
Input Bias Current
V
CM
= 18V (Note 3)
SHDN or V
S
= 0V, V
CM
= 0V to 18V
∆I
B
/∆T
e
n
i
n
R
IN
Input Bias Current Drift
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
– 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
q
q
q
q
q
q
q
q
q
∆V
OS
/∆T Input Offset Voltage Drift (Note 7)
I
OS
Input Offset Current
C
IN
V
CM
Input Capacitance
Input Voltage Range
0
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
+
6 V
+ –
ORDER PART
NUMBER
5 SHDN
4 –IN
V
–
2
+IN 3
LT1784CS6
LT1784IS6
S6 PART MARKING
LTIW
LTIX
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 230°C/ W
MIN
TYP
1.5
MAX
3.5
4.2
4.5
15
50
50
500
400
UNITS
mV
mV
mV
µV/°C
nA
µA
nA
µA
nA
nA/°C
µV
P-P
nV/√Hz
pA/√Hz
kΩ
MΩ
kΩ
pF
5
25
250
225
0.1
0.4
1.5
25
0.3
100
45
200
150
80
5
18
V
LT1784
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, for the 6-lead part V
PIN5
= 0V, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
CMRR
PSRR
A
VOL
Common Mode Rejection Ratio
(Note 3)
Power Supply Rejection Ratio
Large-Signal Voltage Gain
CONDITIONS
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
V
OL
Output Voltage Swing LOW
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
I
SC
Short-Circuit Current (Note 2)
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
Minimum Supply Voltage
Reverse Supply Voltage
I
S
Supply Current
(Note 4)
Supply Current, Shutdown
I
SHDN
SHDN Pin Current
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)
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,
∆V
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
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
84
60
90
133
90
60
266
180
120
TYP
95
70
100
1000
MAX
UNITS
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
1000
4
200
350
2.885
2.600
4.885
4.400
4
15
12.5
20.0
2.93
2.8
4.93
4.7
7.5
30
22
40
2.5
18
500
10
400
600
mV
mV
mV
V
V
V
V
mA
mA
mA
mA
V
OH
Output Voltage Swing HIGH
2.7
750
900
18
8
1
30
0.3
V
V
µA
µA
µA
nA
µA
µA
µA
µA
V
V
µs
µs
MHz
MHz
MHz
V/µs
V/µs
V/µs
kHz
µs
%
I
S
= –100µA
q
q
q
q
q
q
q
q
q
7
0.5
2.0
5.0
0.05
10
2
18
2.2
1.5
1.2
1.1
1.2
1.1
1.0
2.5
Output Leakage Current, Shutdown
Maximum SHDN Pin Current
V
IL
V
IH
t
ON
t
OFF
GBW
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
Turn-On Time
Turn-Off Time
Gain Bandwidth Product
(Note 4)
Slew Rate
(Note 5)
Full-Power Bandwidth (Note 9)
Settling Time
Distortion
SR
2.1
FPBW
t
S
THD
350
3.7
0.001
3
LT1784
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, for the 6-lead part V
PIN5
= V
–
, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
V
OS
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
q
q
q
q
q
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
OS
/∆T Input Offset Voltage Drift (Note 7)
I
OS
I
B
∆I
B
/∆T
e
n
i
n
R
IN
C
IN
V
CM
CMRR
A
VOL
V
OL
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
0°C
≤
T
A
≤
70°C
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= –5V to 13V
q
q
q
100
45
–5
60
50
35
200
80
5
13
70
100
– 4.996
– 4.800
– 4.650
– 4.99
– 4.60
– 4.40
q
V
dB
V/mV
V/mV
V
V
V
V
V
V
mA
mA
dB
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
q
q
q
q
q
q
q
q
q
q
q
V
OH
Output Voltage Swing HIGH
4.885
4.550
4.400
15
10
90
4.92
4.75
4.65
27
100
540
800
975
20
8
30
1
– 4.7
I
SC
PSRR
I
S
Short-Circuit Current (Note 2)
Power Supply Rejection Ratio
Supply Current
Supply Current, Shutdown
µA
µA
µA
nA
µA
µA
µA
V
V
µs
µs
MHz
MHz
MHz
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)
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
q
q
q
q
q
q
q
q
q
q
q
8
0.5
2.0
10
0.05
–3
18
2.2
1.55
1.30
1.20
2.6
I
SHDN
SHDN Pin Current
Maximum SHDN Pin Current
Output Leakage Current, Shutdown
V
IL
V
IH
t
ON
t
OFF
GBW
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
Turn-On Time
Turn-Off Time
Gain Bandwidth Product
4
LT1784
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, for the 6-lead part V
PIN5
= V
–
, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
SR
Slew Rate
CONDITIONS
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,
∆V
OUT
= 4V to 0.1%, A
V
= 1
q
q
MIN
1.3
1.2
1.1
TYP
2.2
MAX
UNITS
V/µs
V/µs
V/µs
kHz
µs
FPBW
t
S
Full-Power Bandwidth (Note 9)
Settling Time
94
3.4
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:
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 PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
700
650
SUPPLY CURRENT (µA)
INPUT OFFSET VOLTAGE CHANGE (µV)
600
550
500
450
400
350
300
2
T
A
= 125°C
T
A
= 25°C
0
–100
–200
–300
–400
1
T
A
= 125°C
T
A
= –55°C
T
A
= 25°C
V
OUT
(V)
4
8 10 12 14
6
SUPPLY VOLTAGE (V)
U W
16
1784 G01
Minimum Supply Voltage
400
300
4
200
100
T
A
= –55°C
3
5
Output Voltage vs Large Input
Voltage
V
S
= 5V, 0V
2
V
IN
1
+
–
5V
18
3
2
4
TOTAL SUPPLY VOLTAGE (V)
5
1784 G02
0
–10
–6
–2
6
2
V
IN
(V)
10
14
18
1784 G03
5
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