LT1784IS5#TR [Linear]
LT1784 - 2.5MHz, Over-The-Top Low Power, Rail-to-Rail Input and Output Op Amp in SOT-23; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C;
| 型号： | LT1784IS5#TR |
| 厂家： | 
Linear |
| 描述： | LT1784 - 2.5MHz, Over-The-Top Low Power, Rail-to-Rail Input and Output Op Amp in SOT-23; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C 放大器 光电二极管 |
| 文件： | 总12页 (文件大小：196K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1784
2.5MHz, Over-The-Top
Low Power, Rail-to-Rail Input
and Output Op Amp in SOT-23
DESCRIPTION
FEATURES
+
The LT®1784 is a 2.5MHz op amp available in the small
SOT-23packagethatoperatesonallsingleandsplitsupplies
withatotalvoltageof2.5Vto18V. Theamplifierdrawsless
than 750μA of quiescent current and has reverse battery
protection, drawing negligible current for reverse supply
voltages up to 18V.
n
Operates with Inputs Above V
n
Rail-to-Rail Input and Output
Gain Bandwidth Product: 2.5MHz
Slew Rate: 2.1V/μs
n
n
n
n
n
n
n
n
n
n
n
n
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
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.
Operating Temperature Range: –40°C to 85°C
Low Profile (1mm) ThinSOT™ Package
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.
APPLICATIONS
n
Portable Instrumentation
n
Battery-Powered Systems
n
Sensor Conditioning
n
Supply Current Sensing
MUX Amplifiers
n
n
4mA to 20mA Transmitters
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.
TYPICAL APPLICATION
Programmable Gain, AV = 2, AV = 20, 100kHz Amplifier
Programmable Gain Amplifier
Frequency Response
V
CC
30
A
= 20
A = 2
V
V
25
A
V
= 20
SHDN
20
15
V
CC
IN
+
10
OUT
LT1784
SHDN
5
V
CC
A
V
= 2
–
0
+
V
EE
–5
LT1782
–10
–15
–20
–
R1 + R2
R3
A
= 1+
V
(
(
)
)
V
EE
1k
10k
100k
FREQUENCY (Hz)
1M
10M
R1
R1
10k
R2
9.09k
OR 1+
R2 + R3
1784 TA01b
R3
1k
1784 TA01a
1784fa
1
LT1784
ABSOLUTE MAXIMUM RATINGS
(Note 1)
+
–
Total Supply Voltage (V to V ).................................18V
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
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
PIN CONFIGURATION
TOP VIEW
+
TOP VIEW
+
V
OUT 1
–
6
5
4
1
2
3
5
4
OUT
V
–
SHDN
–IN
V
2
V
+IN 3
+IN
–IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C, θ = 230°C/W
T
= 150°C, θ = 250°C/W
JA
JA
JMAX
ORDER INFORMATION
LEAD FREE FINISH
LT1784CS5#PBF
LT1784IS5#PBF
LT1784CS6#PBF
LT1784IS6#PBF
TAPE AND REEL
PART MARKING
LTJD
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
LT1784CS5#TRPBF
LT1784IS5#TRPBF
LT1784CS6#TRPBF
LT1784IS6#TRPBF
LTSN
–40°C to 85°C
LTIW
–40°C to 85°C
LTIX
–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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part
VPIN5 = 0V, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
T = 25°C
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
1.5
3.5
4.2
4.5
mV
mV
mV
OS
A
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
l
Input Offset Voltage Drift (Note 7)
Input Offset Current
–40°C ≤ T ≤ 85°C
5
15
μV/°C
ΔV /ΔT
A
OS
l
l
I
25
50
50
nA
μA
OS
V
CM
= 18V (Note 3)
1784fa
2
LT1784
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part
VPIN5 = 0V, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
I
Input Bias Current
250
225
0.1
500
400
nA
μA
nA
B
V
= 18V (Note 3)
CM
SHDN or V = 0V, V = 0V to 18V
S
CM
l
Input Bias Current Drift
Input Noise Voltage
–40°C ≤ T ≤ 85°C
0.4
1.5
25
nA/°C
ΔI /ΔT
A
B
0.1Hz to 10Hz
f = 10kHz
μV
P-P
e
n
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
nV/√Hz
pA/√Hz
i
n
f = 10kHz
0.3
R
IN
Differential
100
45
200
150
80
kΩ
MΩ
kΩ
Common Mode, V = 0V to (V – 1.2V)
CM
CC
Common Mode, V = 0V to 18V
CM
C
V
Input Capacitance
5
pF
V
IN
l
Input Voltage Range
0
18
CM
l
l
CMRR
Common Mode Rejection Ratio
(Note 3)
V
V
= 0V to V – 1.2V
84
60
95
70
dB
dB
CM
CM
CC
= 0V to 18V (Note 6)
l
PSRR
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V = 3V to 12.5V, V = V = 1V
90
100
dB
S
CM
O
A
VOL
V = 3V, V = 500mV to 2.5V, R = 10k
133
90
60
1000
V/mV
V/mV
V/mV
S
S
O
L
l
l
V = 3V, 0°C ≤ T ≤ 70°C
A
V = 3V, –40°C ≤ T ≤ 85°C
S
A
V = 5V, V = 500mV to 4.5V, R = 10k
266
180
120
1000
V/mV
V/mV
V/mV
S
O
L
l
l
V = 5V, 0°C ≤ T ≤ 70°C
S
A
V = 5V, –40°C ≤ T ≤ 85°C
S
A
l
l
l
V
V
Output Voltage Swing LOW
Output Voltage Swing HIGH
No Load
4
10
400
600
mV
mV
mV
OL
I
= 5mA
200
350
SINK
V = 5V, I
= 10mA
SINK
S
l
l
V = 3V, No Load
2.885
2.600
2.93
2.8
V
V
OH
S
V = 3V, I
= 3mA
SOURCE
S
l
l
V = 5V, No Load
S
4.885
4.400
4.93
4.7
V
V
S
V = 5V, I
= 10mA
SOURCE
I
Short-Circuit Current (Note 2)
V = 3V, Short to GND
4
15
7.5
30
mA
mA
SC
S
V = 3V, Short to V
S
CC
V = 5V, Short to GND
12.5
20.0
22
40
mA
mA
S
V = 5V, Short to V
S
CC
l
l
Minimum Supply Voltage
Reverse Supply Voltage
2.5
2.7
V
V
I = –100μA
S
18
I
I
Supply Current
(Note 4)
500
7
750
900
μA
μA
S
l
l
Supply Current, Shutdown
SHDN Pin Current
V
= 2V, No Load (Note 8)
18
μA
PIN5
l
l
V
PIN5
V
PIN5
V
PIN5
= 0.3V (On), No Load (Note 8)
= 2V (Shutdown), No Load (Note 8)
= 5V (Shutdown), No Load (Note 8)
0.5
2.0
5.0
nA
μA
μA
SHDN
8
l
l
l
l
Output Leakage Current, Shutdown
Maximum SHDN Pin Current
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
Turn-On Time
V
V
= 2V, No Load (Note 8)
= 18V, No Load (Note 8)
0.05
10
1
μA
μA
V
PIN5
PIN5
30
0.3
V
V
(Note 8)
(Note 8)
IL
IH
2
V
t
t
V
V
= 5V to 0V, R = 10k (Note 8)
18
μs
μs
ON
OFF
PIN5
PIN5
L
Turn-Off Time
= 0V to 5V, R = 10k (Note 8)
2.2
L
1784fa
3
LT1784
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part
VPIN5 = 0V, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
GBW
Gain Bandwidth Product
(Note 4)
f = 5kHz
1.5
1.2
1.1
2.5
MHz
MHz
MHz
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
SR
Slew Rate
(Note 5)
1.2
1.1
1.0
2.1
V/μs
V/μs
V/μs
A = –1, R = ∞
V
L
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
FPBW
Full-Power Bandwidth (Note 9)
Settling Time
V
= 2V
350
3.7
kHz
μs
OUT
P-P
t
V = 5V, ΔV
S
= 2V to 0.1%, A = –1
V
S
OUT
THD
Distortion
V = 3V, V = 1.8V , A = 1, R = 10k, f = 1kHz
0.001
%
S
O
P-P
V
L
The l denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
VS = 5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
T = 25°C
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
1.6
3.75
4.50
4.80
mV
mV
mV
A
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
l
l
l
l
Input Offset Voltage Drift (Note 7)
Input Offset Current
–40°C ≤ T ≤ 85°C
5
15
50
μV/°C
nA
ΔV /ΔT
A
OS
I
OS
I
B
25
Input Bias Current
250
0.4
1.5
25
500
nA
Input Bias Current Drift
Input Noise Voltage
0°C ≤ T ≤ 70°C
nA/°C
ΔI /ΔT
B
A
0.1Hz to 10Hz
f = 1kHz
μV
P-P
e
n
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
nV/√Hz
pA/√Hz
i
n
f = 1kHz
0.3
l
l
R
IN
Differential
100
45
200
80
kΩ
kΩ
Common Mode, V = –5V to 13V
CM
C
V
Input Capacitance
5
pF
V
IN
l
l
Input Voltage Range
–5
60
13
CM
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –5V to 13V
70
dB
CM
A
VOL
V = 4V, R = 10k
50
35
100
V/mV
V/mV
O
L
l
0°C ≤ T ≤ 70°C
A
l
l
l
V
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current (Note 2)
No Load
–4.996
–4.800
–4.650
–4.99
–4.60
–4.40
V
V
V
OL
OH
I
I
= 5mA
SINK
SINK
= 10mA
l
l
l
V
No Load
4.885
4.550
4.400
4.92
4.75
4.65
V
V
V
I
I
= 5mA
SOURCE
SOURCE
= 10mA
I
Short to GND
0°C ≤ T ≤ 70°C
15
10
27
mA
mA
SC
l
l
A
PSRR
Power Supply Rejection Ratio
Supply Current
V = 1.5V to 9V
S
90
100
540
dB
I
800
975
μA
μA
S
l
l
Supply Current, Shutdown
SHDN Pin Current
V
PIN5
= –3V, V = 5V, No Load (Note 8)
8
20
μA
S
l
l
I
V
PIN5
V
PIN5
= –4.7V (On), V = 5V, No Load (Note 8)
= –3V (Shutdown), V = 5V, No Load (Note 8)
0.5
2.0
nA
μA
SHDN
S
8
30
1
S
l
l
Maximum SHDN Pin Current
V
PIN5
V
PIN5
= 9V, V = 9V (Note 8)
10
μA
μA
S
Output Leakage Current, Shutdown
= –7V, V = 9V, No Load (Note 8)
0.05
S
1784fa
4
LT1784
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–,
pulse power tested unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
V = 5V (Note 8)
MIN
TYP
MAX
UNITS
l
l
l
l
V
V
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
Turn-On Time
–4.7
V
V
IL
IH
S
V = 5V (Note 8)
S
–3
t
t
V
V
= 0V to –5V, R = 10k (Note 8)
18
2.2
2.6
μs
μs
ON
OFF
PIN5
PIN5
L
Turn-Off Time
= –5V to 0V, R = 10k (Note 8)
L
GBW
Gain Bandwidth Product
f = 5kHz
0°C ≤ T ≤ 70°C
1.55
1.30
1.20
MHz
MHz
MHz
l
l
A
–40°C ≤ T ≤ 85°C
A
SR
Slew Rate
1.3
1.2
1.1
2.2
V/μs
V/μs
V/μs
A = –1, R = ∞, V = 4V, Measured at V = 2V
V
L
O
O
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
FPBW
Full-Power Bandwidth (Note 9)
Settling Time
V
= 8V
94
kHz
μs
OUT
P-P
t
S
3.4
V = 5V, ΔV
S
= 4V to 0.1%, A = 1
V
OUT
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 6: This specification implies a typical input offset voltage of 5.7mV at
= 18V and a maximum input offset voltage of 18mV at V = 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.
V
CM
CM
FPBW = SR/2πV .
P
Note 3: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
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.
V = 5V or V = 9V tests.
S
S
Note 4: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
V = 5V or V = 9V tests.
S
S
Note 5: Guaranteed by correlation to slew rate at V = 5V, and GBW at
S
V = 5V and V = 5V tests.
S
S
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage
vs Large Input Voltage
Supply Current vs Supply Voltage
Minimum Supply Voltage
5
4
3
2
1
0
400
300
700
650
600
550
500
450
400
350
300
V
= 5V, 0V
S
200
T
= 125°C
A
T
= 25°C
T
100
A
T
= –55°C
A
T
= 125°C
A
0
T
= 25°C
A
5V
–100
–200
–300
–400
= –55°C
A
+
–
V
IN
3
TOTAL SUPPLY VOLTAGE (V)
1
2
4
5
–10
–2
2
V
6
(V)
10
14
18
–6
10
SUPPLY VOLTAGE (V)
2
4
6
8
12 14 16 18
IN
1784 G02
1784 G03
1784 G01
1784fa
5
LT1784
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current
Output Saturation Voltage
Output Saturation Voltage
vs Common Mode Voltage
vs Load Current (Output High)
vs Load Current (Output Low)
1
300,000
250,000
200,000
150,000
100,000
1
0.1
V
V
=
S
OD
2.5V
= 30mV
V
V
= p2.5V
OD
V
= 5V, 0V
S
S
= 30mV
T
= 125oC
A
T
= 25°C
A
0.1
800
600
400
200
0
T
= 25oC
T
= 125°C
A
A
T
= –55°C
A
T
= 25°C
0.01
0.001
A
T
= 125°C
A
T
= –55°C
A
T
= –55oC
A
–200
–400
0.01
3.5
4.5
5
5.5
14 16 18
4
1
10
100
1000
10000
1
10
100
1000
10000
COMMON MODE VOLTAGE (V)
SOURCING LOAD CURRENT (μA)
SINKING LOAD CURRENT (µA)
1784 G05
1784 G06
1784 G04
Output Saturation Voltage
vs Input Overdrive
Output Short-Circuit Current
vs Temperature
0.1Hz to 10Hz Noise Voltage
100
10
1
50
45
40
35
30
25
V
= 2.5V
V
= 5V
S
S
OUTPUT HIGH
SINKING
OUTPUT LOW
V
= 2.5V
S
SOURCING
NO LOAD
0
10
20
30
40
50
60
0
1
2
3
4
5
6
7
8
9
10
–50
0
25
50
75
100 125
–25
INPUT OVERDRIVE (mV)
TIME (sec)
TEMPERATURE (°C)
1784 G07
1784 G09
1784 G08
Noise Voltage Density
vs Frequency
Gain and Phase Shift
vs Frequency
Input Noise Current vs Frequency
70
60
120
100
80
100
90
80
70
60
50
40
30
20
10
0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
= 2.5V
V
= 2.5V
V
=
2.5V
S
S
S
50
PHASE
40
60
30
40
20
20
GAIN
10
0
0
–20
–40
–60
–80
–10
–20
–30
1
10
100
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
1M
1
10
100
1k
10k
100k
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
1784 G12
1784 G11
1784 G10
1784fa
6
LT1784
TYPICAL PERFORMANCE CHARACTERISTICS
Gain Bandwidth Product
vs Temperature
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
Slew Rate vs Temperature
65
60
55
2.8
2.7
2.6
2.5
2.4
2.3
2.2
3.0
2.5
2.0
1.5
A
= –1
G
V
=
2.5V
V
= 5V
V
F
S
PHASE MARGIN
S
R
= R = 10k
f = 5kHz
f = 5kHz
RISING
FALLING
GAIN BANDWIDTH
PRODUCT
2.7
2.6
2.5
2.4
50
TEMPERATURE (°C)
100 125
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
–50 –25
0
25
75
0
2
4
6
8
10 12 14 16 18
TOTAL SUPPLY VOLTAGE (V)
1784 G13
1784 G14
1784 G15
Gain Bandwidth and Phase
Margin vs Load Resistance
PSRR vs Frequency
CMRR vs Frequency
120
65
90
80
70
60
50
40
30
20
10
0
V
=
2.5V
V = 2.5V
S
S
110
100
90
80
70
60
50
40
30
20
60
55
PHASE MARGIN
POSITIVE SUPPLY
GAIN BANDWIDTH
PRODUCT
NEGATIVE SUPPLY
2.6
2.4
2.2
2.0
V
A
= 2.5V
S
V
F
= –1
R
= R = 10k
G
f = 5kHz
–10
1k
10k
LOAD RESISTANCE (Ω)
100k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
1784 G17
1784 G18
1784 G16
Disabled Output Impedance
vs Frequency
Settling Time to 0.1%
vs Output Step
Output Impedance vs Frequency
1k
100
10
5
4
1M
V
= 2.5V
V
V
=
PIN 5
2.5V
= 2.5V
V
= 5V
S
S
S
A
= 1
V
3
100k
A
= –1
V
A
= 100
V
2
1
10k
1k
0
A
= 10
V
–1
–2
–3
–4
–5
1
A
= –1
V
A
= 1
V
A
= 1
2
V
0.1
100
100
0.01
0
4
6
7
1
3
5
8
1k
10k
100k
1M
100
1k
10k
FREQUENCY (Hz)
100k
1M
SETTLING TIME (μs)
FREQUENCY (Hz)
1784 G20
1784 G19
1784 G21
1784fa
7
LT1784
TYPICAL PERFORMANCE CHARACTERISTICS
Capacitive Load Handling
Undistorted Output Swing
vs Frequency
Total Harmonic Distortion + Noise
vs Frequency
Overshoot vs Capacitive Load
70
60
50
40
30
20
10
0
12
10
8
0.1
0.01
DISTORTION ≤ 1%
= 1
V
V
= 5V, 0V
= 2.5V
R
V
= 10k
L
S
CM
A
= 3V, 0V
V
V
=
5V
S
S
A
= 1
V
V
V
= 1.8V
OUT
CM
P-P
= 1V
A
= 5
V
6
V
=
2.5V
A
= –1
S
V
A
= 1
V
4
0.001
A
= 10
V
2
0
0.0001
10
100
CAPACITIVE LOAD (pF)
1000
1k
10k
100k
1M
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
1784 G22
1784 G24
1784 G23
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage Amplitude
Open-Loop Gain
10
1
1
FREQUENCY = 1kHz
A
V
V
= 1
V
S
V
S
= 5V
V
= HALF SUPPLY
= 3V TOTAL
CM
V
V
=
IN
1.5V
1V
S
= 2V AT 1kHz
IN
P-P
=
R
= 2k
L
0.1
A
V
= 1
= 3V, 0V
V
S
R
= 10k
L
0.1
0.01
0.01
A
V
= –1
V
S
R
= 50k
L
= 3V, 0V
A
V
= 1
=
V
S
RF = RG = 10k
1.5V
V
V
= 3V, 0V
IN
S
= 0.1V TO 2.1V
0.001
A
V
= –1
1.5V
V
S
=
RF = RG = 10k
0.0001
0.001
–6 –5 –4 –3 –2 –1
0
1
2
3
4
5
6
100
1k
10k
100k
0
1
2
3
OUTPUT VOLTAGE AMPLITUDE (V
)
OUTPUT VOLTAGE (V)
P-P
LOAD RESISTANCE TO GROUND (Ω)
1784 G26
1784 G27
1784 G25
Supply Current
vs SHDN Pin Voltage
Large Signal Response
Small Signal Response
600
550
500
450
400
350
300
250
200
150
100
50
V
= 5V, 0V
S
T
= 125°C
A
T
= 25°C
A
T
= –55°C
A
20mV/DIV
2V/DIV
1784 G29
1784 G30
V
A
C
=
= 1
= 15pF
5V
5μs/DIV
V
A
C
=
= 1
= 15pF
5V
2μs/DIV
S
V
L
S
V
L
0
0
0.5
1
1.5
2
2.5
SHUTDOWN PIN VOLTAGE (V)
1784 G28
1784fa
8
LT1784
APPLICATIONS INFORMATION
Supply Voltage
Output
The positive supply pin of the LT1784 should be bypassed
with a small capacitor (typically 0.1μF) within an inch of
the pin. When driving heavy loads, and additional 4.7μF
electrolytic capacitor should be used. When using split
supplies the same is true for the negative supply pin.
The output of the LT1784 can swing to within 80mV of the
positive rail and within 4mV of the negative rail with no
load. When monitoring input voltages within 80mV of the
positive rail or within 4mV of the negative rail, gain should
be taken to keep the output from clipping. The LT1784
can typically sink and source over 25mA at 5V supplies,
sourcing current is reduced to 7.5mA at 3V total supplies
as noted in the Electrical Characteristics section.
The LT1784 is protected against reverse battery voltages
up to 18V. In the event a reverse battery condition occurs
the supply current is less than 1nA.
The LT1784 is internally compensated to drive at least
400pF of capacitance under any output loading condi-
tions. A 0.22μF capacitor in series with a 150ꢀ resistor
between the output and ground will compensate these
amplifiers for larger capacitive loads, up to 10,000pF at
all output currents.
Inputs
The LT1784 has two input stages, NPN and PNP (see the
SimplifiedSchematic),resultinginthreedistinctoperating
regions as shown in the “Input Bias Current vs Common
Mode” Typical Performance Characteristic curve.
+
For input voltages about 1V or more below V , the PNP
Distortion
input stage is active and the input bias current is typically
–250nA. When the input common mode voltage is within
0.6V of the positive rail, the NPN stage is operating and
the input bias current is typically 500nA. Increases in
temperature will cause the voltage at which operation
switches from the PNP input stage to the NPN input stage
There are two main contributors to distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current, and distortion caused by non-
linear common mode rejection. If the op amp is operating
inverting, there is no common mode induced distortion.
If the op amp is operating in the PNP input stage (input
+
to move towards V . The input offset voltage of the NPN
+
not within 1V of V ), the CMRR is very good, typically
stage is untrimmed and is typically 3mV.
95dB. When the LT1784 switches between input stages,
there is significant nonlinearity in the CMRR. Lower load
resistance increases the output crossover distortion but
has no effect on the input stage transition distortion. For
lowest distortion, the LT1784 should be operated single
supply, with the output always sourcing current and with
A Schottky diode in the collector of the input transistors,
along with special geometries for these NPN transistors,
allowtheLT1784tooperatewitheitherorbothofitsinputs
+
+
above V . At about 0.3V above V , the NPN input transis-
tors is fully saturated and the input bias current is typically
200μA at room temperature. The input offset voltage is
+
theinputvoltageswingbetweengroundand(V –1V).See
+
typically 3mV when operating above V . The LT1784 will
operate with inputs 18V above V regardless of V .
TypicalPerformanceCharacteristicscurve,“TotalHarmonic
Distortion + Noise vs Output Voltage Amplitude.”
–
+
The inputs are protected against excursions as much as
Gain
–
10V below V by an internal 1k resistor in series with each
input and a diode from the input to the negative supply.
The input stage of the LT1784 incorporates phase reversal
protection to prevent the output from phase reversing for
The open-loop gain is almost independent of load when
theoutputissourcingcurrent.Thisoptimizesperformance
in single supply applications where the load is returned
to ground. The Typical Performance Characteric curve
“Open-Loop Gain” for various loads shows the details.
–
inputs up to 9V below V . There are no clamping diodes
between the inputs and the maximum differential input
voltage is 18V.
1784fa
9
LT1784
APPLICATIONS INFORMATION
Shutdown
–
the SHDN pin 1.2V or more above V . When shut down,
–
+
the supply current is less than 1μA (V ≤ V
≤ V ). In
OUT
The 6-lead part includes a shutdown feature that disables
thepart,reducingquiescentcurrentandmakingtheoutput
high impedance. The part can be shut down by bringing
–
normal operation, the SHDN pin can be tied to V or left
floating. See Typical Performance Characteristics curve,
“Supply Current vs SHDN pin Voltage.”
TYPICAL APPLICATIONS
Negative Rectifier
Adjustable Clamp
+
V
–
LT1784
V
+
IN
+
V
- ~80mV
CLAMP
OUT
LT1784
–
V
IN
–
+
V
10k
V
LT1784
WORKS WELL
TO 100kHz
OUT
–
V
- ~80mV
CLAMP
V
–
10k
WORKS WELL
TO 100kHz
–
V
1784 TA02
SIMPLIFIED SCHEMATIC
+
V
Q2
Q1
Q3
Q22
D1
SHDN
R1
6k
D3
R2
1k
Q19
–IN
+IN
Q4
R6
R7
1.5k
1.5k
Q17
Q18
Q20
J1
+
OUT
Q7
Q8
Q11
Q12
R3
1k
20μA
Q16
R8
0.75k
R9
0.75k
Q15
Q9
D5
Q10
Q26
Q13
Q14
Q21
R4
2k
R5
2k
Q25 Q23
Q24
Q5
Q6
D4
–
V
1784 SS
1784fa
10
LT1784
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635 Rev B)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.4 MIN
1.50 – 1.75
(NOTE 4)
2.80 BSC
3.85 MAX 2.62 REF
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 TSOT-23 0302 REV B
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636 Rev B)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302 REV B
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1784fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT1784
TYPICAL APPLICATIONS
Protected Fault Conditions
–18V
5V
5V
5V
+
+
V
V
+
+
–
+
–
+
–
+
LT1784
LT1784
LT1784
LT1784
18V
–
+
10V
+
24V
1784 TA03
REVERSE BATTERY
INPUT OVERVOLTAGE
INPUT DIFFERENTIAL VOLTAGE
INPUTS BELOW GROUND
Simple Peak Detector
Simple Supply Full Wave Rectifier
1k
5V
OUT
ACCURACY
BANDWIDTH
V
+
IN
BAT54
5V
98%
90%
3dB
3kHz TO 5.7kHz
116Hz TO 47kHz
34Hz TO 96kHz
LT1784
1k
1k
–
BAT54
1μF
IN
–
+
LT1784
V
OUT
WORKS WELL
TO 15kHz
100k
V
IN
= 3V , V = 2.5V
P-P CM
1784 TA04
1785 TA05
Simple Polarity Selector
1k
+
V
IN
1k
IN
1V/DIV
–
+
OUT
1V/DIV
LT1784
OUT
FOLLOW
SHDN
0V
–
V
SHDN
5V/DIV
INVERT
–
V
1785 TA06a
1785 TA06b
100μs/DIV
= 3V AT 5kHz
V
V
= 5V
S
IN
P-P
RELATED PARTS
PART NUMBER
LT1782
DESCRIPTION
COMMENTS
Micropower Over-The-Top Rail-to-Rail In/Out Op Amp in SOT-23
1.25MHz Over-The-Top Rail-to-Rail In/Out Op Amp in SOT-23
10MHz Rail-to-Rail In/Out Op Amp in SOT-23
55μA Max Supply Current, 800μV Max Offset Voltage
300μA Max Supply Current, 800μV Max Offset Voltage
Unity-Gain Stable, 2.25μV/μs Slew Rate
Micropower, 0.4V/μs Slew Rate
LT1783
LT1797
LT1637
1.1MHz Over-The-Top Rail-to-Rail In/Out Op Amp
LT1638/LT1639
LT1880
Dual/Quad 1.2MHz Over-The-Top Rail-to-Rail In/Out Op Amp
SOT-23 Pico Amp Input, Precision, Rail-to-Rail Output Op Amp
Micropower 230μA Max, 0.4V/μs Slew Rate
150μV Offset, 900pA Bias Current
1784fa
LT 0609 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
© LINEAR TECHNOLOGY CORPORATION 2000
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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