LT1784CS6#PBF [Linear]
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| 型号： | LT1784CS6#PBF |
| 厂家： | 
Linear |
| 描述： | 暂无描述 运算放大器 放大器电路 |
| 文件： | 总12页 (文件大小：194K) |
| 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
U
FEATURES
DESCRIPTIO
Operates with Inputs Above V+
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.
■
■
Rail-to-Rail Input and Output
Low Profile (1mm) ThinSOTTM Package
■
■
Gain Bandwidth Product: 2.5MHz
■
Slew Rate: 2.1V/µs
■
Low Input Offset Voltage: 3.5mV Max
■
High Voltage Gain: 1000V/mV
The input range of the LT1784 includes ground, and a
unique feature of this device is its Over-The-TopTM 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.
■
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
U
APPLICATIO S
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-23packages.Forapplicationsrequiringlowerpower,
refer to the LT1782 and LT1783 data sheets.
■
Portable Instrumentation
■
Battery-Powered Systems
■
Sensor Conditioning
■
Supply Current Sensing
■
MUX Amplifiers
■
4mA to 20mA Transmitters
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top and ThinSOT are trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Programmable Gain, AV = 2, AV = 20, 100kHz Amplifier
Programmable Gain Amplifier
Frequency Response
V
CC
30
A
V
= 20
A = 2
V
25
A
V
= 20
SHDN
20
15
V
CC
EE
IN
+
10
OUT
LT1784
V
SHDN
5
V
CC
A
V
= 2
–
0
+
–5
–10
–15
–20
LT1782
–
R1 + R2
R3
A
V
= 1+
(
(
)
)
V
EE
1k
10k
100k
FREQUENCY (Hz)
1M
10M
R1
R1
10k
R2
9.09k
OR 1+
R2 + R3
1784 TA01a
R3
1k
1784 TA01
1
LT1784
W W
U W
(Note 1)
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
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
U
W U
PACKAGE/ORDER INFORMATION
ORDER PART
ORDER PART
TOP VIEW
TOP VIEW
NUMBER
NUMBER
+
+
1
2
5
4
OUT
V
V
OUT 1
–
6
5
4
–
V
LT1784CS5
LT1784IS5
LT1784CS6
LT1784IS6
SHDN
–IN
V
2
+IN 3
–IN
+IN 3
S5 PACKAGE
5-LEAD PLASTIC SOT-23
S6 PACKAGE
6-LEAD PLASTIC SOT-23
S5 PART MARKING
S6 PART MARKING
TJMAX = 150°C, θJA = 250°C/ W
TJMAX = 150°C, θJA = 230°C/ W
LTJD
LTSN
LTIW
LTIX
Consult LTC marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the specified temperature range, otherwise specifications are 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
Input Offset Voltage
CONDITIONS
T = 25°C
MIN
TYP
MAX
UNITS
V
1.5
3.5
4.2
4.5
mV
mV
mV
OS
A
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
∆V /∆T Input Offset Voltage Drift (Note 7)
OS
–40°C ≤ T ≤ 85°C
●
5
15
µV/°C
A
I
Input Offset Current
●
●
25
50
50
nA
µA
OS
V
V
= 18V (Note 3)
= 18V (Note 3)
CM
I
Input Bias Current
●
●
250
225
0.1
500
400
nA
µA
nA
B
CM
SHDN or V = 0V, V = 0V to 18V
S
CM
∆I /∆T Input Bias Current Drift
–40°C ≤ T ≤ 85°C
●
0.4
1.5
25
nA/°C
B
A
Input Noise Voltage
0.1Hz to 10Hz
f = 10kHz
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
nV/√Hz
pA/√Hz
n
i
f = 10kHz
0.3
n
R
Differential
100
45
200
150
80
kΩ
MΩ
kΩ
IN
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
Input Voltage Range
●
0
18
CM
2
LT1784
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the specified temperature range, otherwise specifications are 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
CMRR
Common Mode Rejection Ratio
(Note 3)
V
V
= 0V to V – 1.2V
= 0V to 18V (Note 6)
●
●
84
60
95
70
dB
dB
CM
CM
CC
PSRR
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V = 3V to 12.5V, V = V = 1V
●
90
100
dB
S
CM
O
A
V = 3V, V = 500mV to 2.5V, R = 10k
133
90
60
1000
V/mV
V/mV
V/mV
VOL
S
O
L
V = 3V, 0°C ≤ T ≤ 70°C
●
●
S
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
V = 5V, 0°C ≤ T ≤ 70°C
●
●
S
A
V = 5V, –40°C ≤ T ≤ 85°C
S
A
V
V
Output Voltage Swing LOW
Output Voltage Swing HIGH
No Load
●
●
●
4
200
350
10
400
600
mV
mV
mV
OL
OH
I
= 5mA
SINK
V = 5V, I
S
= 10mA
SINK
V = 3V, No Load
●
●
2.885
2.600
2.93
2.8
V
V
S
V = 3V, I
S
= 3mA
SOURCE
V = 5V, No Load
●
●
4.885
4.400
4.93
4.7
V
V
S
V = 5V, I
= 10mA
S
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
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
●
●
Supply Current, Shutdown
SHDN Pin Current
V
= 2V, No Load (Note 8)
18
µA
PIN5
V
V
V
= 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
PIN5
PIN5
PIN5
8
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
2.2
2.5
µs
µs
ON
OFF
PIN5
PIN5
L
Turn-Off Time
= 0V to 5V, R = 10k (Note 8)
L
GBW
Gain Bandwidth Product
(Note 4)
f = 5kHz
0°C ≤ T ≤ 70°C
–40°C ≤ T ≤ 85°C
1.5
1.2
1.1
MHz
MHz
MHz
●
●
A
A
SR
Slew Rate
(Note 5)
A = –1, R = ∞
1.2
1.1
1.0
2.1
V/µs
V/µs
V/µs
V
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, ∆V
= 2V to 0.1%, A = –1
OUT V
S
S
THD
Distortion
V = 3V, V = 1.8V , A = 1, R = 10k, f = 1kHz
0.001
%
S
O
P-P
V
L
3
LT1784
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = ±5V, VCM = 0V,VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS
T = 25°C
MIN
TYP
MAX
UNITS
V
1.6
3.75
4.50
4.80
mV
mV
mV
OS
A
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
∆V /∆T Input Offset Voltage Drift (Note 7)
–40°C ≤ T ≤ 85°C
●
●
●
●
5
15
50
µV/°C
nA
OS
A
I
I
Input Offset Current
Input Bias Current
25
OS
B
250
0.4
1.5
25
500
nA
∆I /∆T Input Bias Current Drift
B
0°C ≤ T ≤ 70°C
nA/°C
A
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.3
n
R
Differential
●
●
100
45
200
80
kΩ
kΩ
IN
Common Mode, V = –5V to 13V
CM
C
V
Input Capacitance
5
pF
V
IN
Input Voltage Range
●
●
–5
60
13
CM
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –5V to 13V
70
dB
CM
A
V = ±4V, R = 10k
0°C ≤ T ≤ 70°C
50
35
100
V/mV
V/mV
VOL
O
L
●
A
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
I
I
= 5mA
= 10mA
SINK
SINK
V
No Load
●
●
●
4.885
4.550
4.400
4.92
4.75
4.65
V
V
V
OH
I
I
= 5mA
= 10mA
SOURCE
SOURCE
I
Short to GND
0°C ≤ T ≤ 70°C
15
10
27
mA
mA
SC
●
●
A
PSRR
Power Supply Rejection Ratio
Supply Current
V = ±1.5V to ±9V
S
90
100
540
dB
I
I
800
975
µA
µA
S
●
●
Supply Current, Shutdown
SHDN Pin Current
V
= –3V, V = ±5V, No Load (Note 8)
8
20
µA
PIN5
S
V
V
= –4.7V (On), V = ±5V, No load (Note 8)
= –3V (Shutdown), V = ±5V, No Load (Note 8)
●
●
0.5
2.0
nA
µA
SHDN
PIN5
PIN5
S
8
30
S
Maximum SHDN Pin Current
Output Leakage Current, Shutdown
SHDN Pin Input Low Voltage
SHDN Pin Input High Voltage
Turn-On Time
V
V
= 9V, V = ±9V (Note 8)
●
●
●
●
●
●
10
µA
µA
V
PIN5
PIN5
S
= –7V, V = ±9V, No Load (Note 8)
0.05
1
S
V
V
V = ±5V (Note 8)
S
–4.7
IL
IH
V = ±5V (Note 8)
S
–3
V
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
●
●
A
–40°C ≤ T ≤ 85°C
A
4
LT1784
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the specified temperature range, otherwise specifications are 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
A = –1, R = ∞, V = ±4V, Measured at V = ±2V
MIN
TYP
MAX
UNITS
SR
Slew Rate
1.3
1.2
1.1
2.2
V/µs
V/µs
V/µs
V
L
O
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
FPBW
Full-Power Bandwidth (Note 9)
Settling Time
V
= 8V
94
kHz
OUT
P-P
t
V = 5V, ∆V
= 4V to 0.1%, A = 1
3.4
µs
S
S
OUT
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 6: This specification implies a typical input offset voltage of 5.7mV at
V = 18V and a maximum input offset voltage of 18mV at V = 18V.
CM
CM
Note 2: A heat sink may be required to keep the junction temperature
Note 7: This parameter is not 100% tested.
below absolute maximum.
Note 8: Specifications apply to 6-lead SOT-23 with shutdown.
Note 9: Full-power bandwidth is calculated from the slew rate.
Note 3: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
V = ±5V or V = ±9V tests.
S
S
FPBW = SR/2πV .
P
Note 4: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
Note 10: The LT1784C is guaranteed functional over the operating
temperature range –40°C to 85°C.
V = ±5V or V = ±9V tests.
S
S
Note 5: Guaranteed by correlation to slew rate at V = ±5V, and GBW at
S
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 and V = ±5V tests.
S
S
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Large Input
Voltage
Supply Current vs Supply Voltage
Minimum Supply Voltage
5
4
3
2
1
0
700
650
600
550
500
450
400
350
300
400
300
V
S
= 5V, 0V
T
A
= 125°C
200
T
A
= 25°C
100
T
A
= –55°C
T
A
= 125°C
0
T
= 25°C
A
5V
T
A
= –55°C
–100
–200
–300
–400
+
–
V
IN
10
SUPPLY VOLTAGE (V)
3
6
18
2
4
6
8
12 14 16 18
1
2
4
5
–10
–2
2
10
–6
14
V
IN
(V)
TOTAL SUPPLY VOLTAGE (V)
1784 G01
1784 G02
1784 G03
5
LT1784
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Input Bias Current vs Common
Mode Voltage
Output Saturation Voltage vs
Load Current (Output Low)
Output Saturation Voltage vs
Load Current (Output High)
300,000
250,000
200,000
150,000
100,000
1
1
0.1
V
V
= ±2.5V
V
S
= 5V, 0V
S
V
V
= ±2.5V
S
= 30mV
OD
= 30mV
OD
T
A
= 125°C
T
A
= 25°C
800
600
400
200
0
0.1
T
= 125°C
T
= 25°C
A
A
T
= –55°C
A
T
= 25°C
A
0.01
0.001
T
= 125°C
A
T
= –55°C
A
T
A
= –55°C
–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 G04
1784 G06
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
S
V
S
= ±5V
OUTPUT HIGH
SINKING
OUTPUT LOW
V
= ±2.5V
S
SOURCING
NO LOAD
0
1
2
3
4
5
6
7
8
9
10
0
10
20
30
40
50
60
–50
0
25
50
75
100 125
–25
TIME (sec)
INPUT OVERDRIVE (mV)
TEMPERATURE (°C)
1784 G07
1784 G09
DC194 G02
Noise Voltage Density vs
Frequency
Input Noise Current vs
Frequency
Gain and Phase Shift 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
S
= ±2.5V
V
= ±2.5V
S
S
50
PHASE
40
60
30
40
20
20
GAIN
10
0
0
–20
–40
–60
–80
–10
–20
–30
1k
10k
100k
FREQUENCY (Hz)
1M
1
10
100
1k
10k
100k
1
10
100
1k
10k
100k
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
1784 G12
1784 G10
1784 G11
6
LT1784
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Gain Bandwidth Product vs
Temperature
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
Slew Rate vs Temperature
2.8
2.7
2.6
2.5
2.4
2.3
2.2
3.0
2.5
2.0
1.5
65
60
55
V
= ±2.5V
A
= –1
V
= ±5V
S
V
S
PHASE MARGIN
f = 5kHz
R = R = 10k
F G
f = 5kHz
RISING
FALLING
GAIN BANDWIDTH
PRODUCT
2.7
2.6
2.5
2.4
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
50
TEMPERATURE (°C)
100 125
–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
100k
1M
1k
10k
LOAD RESISTANCE (Ω)
100k
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
5
4
1k
100
10
1M
V
V
= ±2.5V
V
= ±2.5V
V = ±5V
S
S
S
= 2.5V
PIN 5
A
V
= 1
3
100k
A
V
= –1
A
= 100
V
2
1
10k
1k
0
A
= 10
V
–1
–2
–3
–4
–5
1
A
= –1
V
A
= 1
V
A
V
= 1
0.1
100
100
0.01
0
4
6
7
1
2
3
5
8
1k
10k
100k
1M
100
1k
10k
FREQUENCY (Hz)
100k
1M
SETTLING TIME (µs)
FREQUENCY (Hz)
1784 G20
1784 G21
1784 G19
7
LT1784
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Capacitive Load Handling
Total Harmonic Distortion +
Noise vs Frequency
Undistorted Output Swing vs
Frequency
Overshoot vs Capacitive Load
0.1
0.01
70
60
50
40
30
20
10
0
12
10
8
DISTORTION ≤ 1%
= 1
R
V
= 10k
V
V
= 5V, 0V
= 2.5V
L
S
S
CM
A
= 3V, 0V
= 1.8V
V
V
= ±5V
S
A
= 1
V
V
V
OUT
CM
P-P
= 1V
A
= 5
V
6
V
= ±2.5V
A = –1
V
S
A
= 1
V
0.001
0.0001
4
A
= 10
V
2
0
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
= ±5V
S
V
= HALF SUPPLY
= 3V TOTAL
CM
V
V
= ±1.5V
= ±1V
S
IN
= 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 (V)
OUTPUT VOLTAGE AMPLITUDE (V
)
P-P
LOAD RESISTANCE TO GROUND (Ω)
1784 G26
1784 G27
1784 G25
Supply Current vs SHDN Pin
Voltage
Small Signal Response
Large 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
V
S
A
V
C
L
= ±5V
= 1
= 15pF
2µs/DIV
V
S
A
V
C
L
= ±5V
= 1
= 15pF
5µs/DIV
0
0
0.5
1
1.5
2
2.5
SHUTDOWN PIN VOLTAGE (V)
1784 G28
8
LT1784
W U U
APPLICATIO S I FOR ATIO
U
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.
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 150Ω 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 Simplified Schematic), resulting in three distinct
operating regions as shown in the “Input Bias Current vs
CommonMode”TypicalPerformanceCharacteristicCurve.
For input voltages about 1V or more below V+, the PNP
input stage is active and the input bias current is typically
–250nA. When the input common mode voltage is within
0.6Vofthepositiverail, theNPNstageisoperatingandthe
input bias current is typically 500nA. Increases in tem-
peraturewillcausethevoltageatwhichoperationswitches
from the PNP input stage to the NPN input stage to move
towards V+. The input offset voltage of the NPN stage is
untrimmed and is typically 3mV.
Distortion
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
nonlinear common mode rejection. If the op amp is
operating inverting, there is no common mode induced
distortion.IftheopampisoperatinginthePNPinputstage
(input not within 1V of V+), the CMRR is very good,
typically 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 the input voltage swing between ground
and (V+ –1V). See Typical Performance Characteristics
Curve, “Total Harmonic Distortion + Noise vs Output
Voltage Amplitude.”
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
typically 3mV when operating above V+. The LT1784 will
operate with inputs 18V above V– regardless of V+.
The inputs are protected against excursions as much as
10V below V– by an internal 1k resistor in series with each
input and a diode from the input to the negative supply.
TheinputstageoftheLT1784incorporatesphasereversal
protection to prevent the output from phase reversing for
inputs up to 9V below V–. There are no clamping diodes
between the inputs and the maximum differential input
voltage is 18V.
Gain
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes perfor-
mance 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.
9
LT1784
W U U
U
APPLICATIO S I FOR ATIO
Shutdown
bringing the SHDN pin 1.2V or more above V–. When shut
down,thesupplycurrentislessthan1µA(V– ≤VOUT ≤V +).
In normal operation, the SHDN pin can be tied to V– or left
floating. See Typical Performance Characteristics Curve,
“Supply Current vs SHDN pin Voltage.”
The 6-lead part includes a shutdown feature that disables
the part, reducing quiescent current and making the
output high impedance. The part can be shut down by
U
TYPICAL APPLICATIO S
Adjustable Clamp
Negative Rectifier
+
V
–
LT1784
V
+
IN
+
V
- ~80mV
CLAMP
OUT
LT1784
–
V
–
+
IN
V
10k
V
LT1784
OUT
WORKS WELL
TO 100kHz
–
V
- ~80mV
CLAMP
V
–
10k
WORKS WELL
TO 100kHz
–
1784 TA07
V
W
W
SI PLIFIED SCHE ATIC
+
V
Q2
Q1
Q3
Q22
D1
SHDN
R1
6k
D3
R2
1k
Q19
–IN
Q4
R6
1.5k
R7
1.5k
Q17
Q20
J1
+
OUT
Q7
Q8
Q11
Q12
R3
1k
20µA
Q16
Q18
+IN
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
10
LT1784
U
PACKAGE DESCRIPTIO
S5 Package
5-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1633)
(Reference LTC DWG # 05-08-1635)
2.80 – 3.10
(.110 – .118)
(NOTE 3)
SOT-23
(Original)
SOT-23
(ThinSOT)
.90 – 1.45
1.00 MAX
A
A1
A2
L
(.035 – .057)
(.039 MAX)
2.60 – 3.00
1.50 – 1.75
.00 – .15
(.00 – .006)
.01 – .10
(.0004 – .004)
(.102 – .118) (.059 – .069)
(NOTE 3)
.90 – 1.30
(.035 – .051)
.80 – .90
(.031 – .035)
.35 – .55
(.014 – .021)
.30 – .50 REF
(.012 – .019 REF)
PIN ONE
.95
(.037)
REF
.25 – .50
(.010 – .020)
(5PLCS, NOTE 2)
.20
(.008)
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
A2
A
MILLIMETERS
(INCHES)
2. DIMENSIONS ARE IN
DATUM ‘A’
L
3. DRAWING NOT TO SCALE
4. DIMENSIONS ARE INCLUSIVE OF PLATING
5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
6. MOLD FLASH SHALL NOT EXCEED .254mm
7. PACKAGE EIAJ REFERENCE IS:
SC-74A (EIAJ) FOR ORIGINAL
JEDEC MO-193 FOR THIN
1.90
(.074)
REF
.09 – .20
(.004 – .008)
(NOTE 2)
A1
S5 SOT-23 0401
S6 Package
6-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1634)
(Reference LTC DWG # 05-08-1636)
2.80 – 3.10
(.110 – .118)
(NOTE 3)
SOT-23
(Original)
SOT-23
(ThinSOT)
.90 – 1.45
1.00 MAX
A
A1
A2
L
(.035 – .057)
(.039 MAX)
.00 – 0.15
(.00 – .006)
.01 – .10
(.0004 – .004)
2.60 – 3.00
1.50 – 1.75
(.102 – .118) (.059 – .069)
(NOTE 3)
.90 – 1.30
(.035 – .051)
.80 – .90
(.031 – .035)
PIN ONE ID
.35 – .55
(.014 – .021)
.30 – .50 REF
(.012 – .019 REF)
.95
(.037)
REF
.25 – .50
(.010 – .020)
(6PLCS, NOTE 2)
NOTE:
.20
(.008)
1. CONTROLLING DIMENSION: MILLIMETERS
A2
MILLIMETERS
(INCHES)
A
2. DIMENSIONS ARE IN
DATUM ‘A’
3. DRAWING NOT TO SCALE
4. DIMENSIONS ARE INCLUSIVE OF PLATING
5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
6. MOLD FLASH SHALL NOT EXCEED .254mm
7. PACKAGE EIAJ REFERENCE IS:
1.90
(.074)
REF
L
.09 – .20
(.004 – .008)
(NOTE 2)
A1
S6 SOT-23 0401
SC-74A (EIAJ) FOR ORIGINAL
JEDEC MO-193 FOR THIN
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1784
U
TYPICAL APPLICATIO S
Protected Fault Conditions
–18V
5V
5V
5V
+
+
V
V
+
+
–
+
–
+
–
+
LT1784
LT1784
LT1784
LT1784
18V
–
+
10V
+
24V
1784 TA02
REVERSE BATTERY
INPUT OVERVOLTAGE
INPUT DIFFERENTIAL VOLTAGE
INPUTS BELOW GROUND
Simple Peak Detector
Single Supply Full Wave Rectifier
1k
5V
OUT
ACCURACY
BANDWIDTH
BAT54
V
IN
+
–
5V
98%
90%
3dB
3kHz TO 5.7kHz
116Hz TO 47kHz
34Hz TO 96kHz
1k
LT1784
1k
BAT54
IN
–
+
LT1784
V
OUT
WORKS WELL
TO 15kHz
1µF
100k
V
= 3V , V = 2.5V
P-P CM
1785 TA05
IN
1784 TA04
Simple Polarity Selector
1k
+
IN
1V/DIV
V
1k
IN
–
OUT
1V/DIV
LT1784
OUT
FOLLOW
SHDN
+
0V
SHDN
5V/DIV
–
V
INVERT
–
V
1785 TA06a
1785 TA06b
100µs/DIV
= 3V AT 5kHz
V
V
= ±5V
S
IN
P-P
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1782
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
1784f LT/TP 0601 2K • 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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