LT1637 - 1.1MHz, 0.4V/µs Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp

LT1637
1.1MHz, 0.4V/µs
Over-The-Top Micropower, Rail-To-Rail
Input and Output Op Amp
DESCRIPTIO
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FEATURES
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Operates with Inputs Above V +
Rail-to-Rail Input and Output
Micropower: 250µA Supply Current Max
Operating Temperature Range: – 55°C to 125°C
Gain-Bandwidth Product: 1.1MHz
Slew Rate: 0.4V/µs
Low Input Offset Voltage: 350µV Max
Single Supply Input Range: – 0.4V to 44V
High Output Current: 25mA Min
Specified on 3V, 5V and ±15V Supplies
Output Shutdown
Output Drives 4700pF with Output Compensation
Reverse Battery Protection to 25V
High Voltage Gain: 800V/mV
High CMRR: 110dB
Available in 8-Lead MSOP, PDIP and SO Packages;
and a Tiny (3mm × 3mm × 0.8mm) DFN Package
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APPLICATIO S
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Battery or Solar Powered Systems:
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
MUX Amplifiers
4mA to 25mA Transmitters
The LT1637 has a unique input stage that operates and
remains high impedance when above the positive supply.
The inputs take 44V both differential and common mode,
even when operating on a 3V supply. Built-in resistors
protect the inputs for faults below the negative supply up
to 22V. There is no phase reversal of the output for inputs
5V below VEE or 44V above VEE, independent of VCC.
The LT1637 op amp is available in the 8-pin MSOP, PDIP
and SO packages. For space limited applications, the
LT1637 is available in a 3mm × 3mm × 0.8mm dual fine
pitch leadless package (DFN).
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Over-The-Top is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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The LT®1637 is a rugged op amp that operates on all single
and split supplies with a total voltage of 2.7V to 44V. The
LT1637 has a gain-bandwidth product of 1.1MHz while
drawing less than 250µA of quiescent current. The LT1637
can be shut down, making the output high impedance and
reducing the quiescent current to only 3µA. The LT1637 is
reverse supply protected: it draws virtually no current for reverse supply up to 25V. The input range of the LT1637 includes both supplies and the output swings to both supplies.
Unlike most micropower op amps, the LT1637 can drive
heavy loads; its rail-to-rail output drives 25mA. The LT1637
is unity-gain stable into all capacitive loads up to 4700pF
when optional 0.22µF and 150Ω compensation is used.
TYPICAL APPLICATIO
Over-The-Top® Current Source with Shutdown
Current Source Timing
Switchable Precision Current Source
6V
4V TO 44V
+
4.7µF
VSHDN
LT1004-1.2
2k
4V
2V
R
0V
R*
+
LT1637
TP0610
–
IOUT
SHDN
10mA
IOUT = 1.2
R
e.g., 10mA = 120Ω
*OPTIONAL FOR LOW OUTPUT CURRENTS,
R* = R
IOUT 5mA
0mA
1637 TA01
100µs/DIV
1637 TA01b
1637fd
1
LT1637
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W W
W
ABSOLUTE
AXI U RATI GS
(Note 1)
Total Supply Voltage (V + to V –) .............................. 44V
Input Differential Voltage ......................................... 44V
Input Current ...................................................... ±25mA
Shutdown Pin Voltage Above V – ..................................... 32V
Shutdown Pin Current ........................................ ±10mA
Output Short-Circuit Duration (Note 2) ......... Continuous
Operating Temperature Range (Note 3)
LT1637C/LT1637I .............................. – 40°C to 85°C
LT1637H .......................................... – 40°C to 125°C
LT1637MP ......................................... –55°C to 125°C
Specified Temperature Range (Note 4)
LT1637C/LT1637I .............................. – 40°C to 85°C
LT1637H .......................................... – 40°C to 125°C
LT1637MP ......................................... –55°C to 125°C
Junction Temperature ........................................... 150°C
Junction Temperature (DD Package) ................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Storage Temperature Range
(DD Package) ....................................... – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U
W
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
NULL 1
8
NULL
–IN A 2
7
V+
+IN A 3
6
OUT
V– 4
5
SHDN
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 160°C/W (NOTE 2)
TOP VIEW
NULL
–IN
+IN
V–
1
2
3
4
8
7
6
5
NULL 1
8
NULL
–IN 2
7
V+
+IN 3
6
OUT
V– 4
5
SHDN
NULL
V+
OUT
SHDN
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 250°C/W
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
UNDERSIDE METAL CONNECTED TO V –
ORDER PART
NUMBER
DD PART*
MARKING
ORDER PART
NUMBER
MS8 PART*
MARKING
LT1637CDD
LT1637IDD
LAAK
LAAK
LT1637CMS8
LT1637IMS8
LTIE
LTIE
ORDER PART
NUMBER
S8 PART
MARKING
1637
1637I
1637H
1637MP
LT1637CN8
LT1637CS8
LT1637IN8
LT1637IS8
LT1637HS8
LT1637MPS8
*The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges.
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3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise
specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4)
LT1637C/LT1637I
MIN
TYP
MAX
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8, S8 Packages
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
●
●
MS8 Package
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
●
●
DD Package
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
●
●
UNITS
100
350
550
700
µV
µV
µV
100
350
750
1100
µV
µV
µV
125
550
950
1100
µV
µV
µV
1637fd
2
LT1637
U
3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise
specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4)
SYMBOL
IOS
IB
PARAMETER
Input Offset Voltage Drift (Note 9)
LT1637C/LT1637I
MIN
TYP
MAX
1
3
2
6
2
6
CONDITIONS
N8, S8 Packages, – 40°C ≤ TA ≤ 85°C
MS8 Package, – 40°C ≤ TA ≤ 85°C
DDPackage, – 40°C ≤ TA ≤ 85°C
●
●
●
●
●
0.4
VCM = 44V (Note 5)
6.0
2.5
nA
µA
●
●
20
23
0.1
50
60
nA
µA
nA
Input Offset Current
Input Bias Current
VCM = 44V (Note 5)
VS = 0V
UNITS
µV/°C
µV/°C
µV/°C
Input Noise Voltage
0.1Hz to 10Hz
0.6
µVP-P
en
Input Noise Voltage Density
f = 1kHz
27
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.08
pA/√Hz
RIN
Input Resistance
Differential
Common Mode, VCM = 0V to 44V
2.6
1.4
MΩ
MΩ
CIN
Input Capacitance
4
pF
Input Voltage Range
1
0.7
●
0
44
V
CMRR
Common Mode Rejection Ratio
(Note 5)
VCM = 0V to (VCC – 1V)
VCM = 0V to 44V (Note 8)
●
●
88
80
110
98
dB
dB
AVOL
Large-Signal Voltage Gain
VS = 3V, VO = 500mV to 2.5V, RL = 10k
VS = 3V, 0°C ≤ TA ≤ 70°C
VS = 3V, – 40°C ≤ TA ≤ 85°C
150
100
75
400
●
●
V/mV
V/mV
V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
VS = 5V, 0°C ≤ TA ≤ 70°C
VS = 5V, – 40°C ≤ TA ≤ 85°C
300
200
150
800
●
●
V/mV
V/mV
V/mV
VOL
Output Voltage Swing LOW
No Load
ISINK = 5mA
VS = 5V, ISINK = 10mA
●
●
●
VOH
Output Voltage Swing HIGH
VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
●
●
2.94
2.25
2.975
2.67
V
V
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
●
●
4.94
3.80
4.975
4.45
V
V
VS = 3V, Short Output to Ground
VS = 3V, Short Output to VCC
10
15
14
45
mA
mA
VS = 5V, Short Output to Ground
VS = 5V, Short Output to VCC
15
15
22
60
mA
mA
90
98
dB
25
40
ISC
PSRR
Short-Circuit Current (Note 2)
Power Supply Rejection Ratio
VS = 3V to 12.5V, VCM = VO = 1V
●
Minimum Supply Voltage
Reverse Supply Voltage
IS
ISHDN
●
3
325
580
IS = – 100µA
Supply Current
(Note 6)
●
8
700
1300
2.7
mV
mV
mV
V
V
190
250
295
µA
µA
●
Supply Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
3
12
µA
Shutdown Pin Current
VPIN5 = 0.3V, No Load (Note 6)
VPIN5 = 2V, No Load (Note 5)
VPIN5 = 3.3V
VPIN5 = 5V
●
●
0.2
1.0
2.5
4.3
15
5
nA
µA
µA
µA
Output Leakage Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
0.02
1
µA
1637fd
3
LT1637
U
3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise
specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –, VCM = VOUT = half supply unless otherwise specified. (Note 4)
SYMBOL
LT1637C/LT1637I
MIN
TYP
MAX
PARAMETER
CONDITIONS
Maximum Shutdown Pin Current
VPIN5 = 32V, No Load (Note 5)
tON
Turn-On Time
VPIN5 = 5V to 0V, RL = 10k
45
µs
tOFF
Turn-Off Time
VPIN5 = 0V to 5V, RL = 10k
3
µs
tSETTLING
Settling Time
0.1% AV = 1, ∆VO = 2V
9
µs
GBW
Gain-Bandwidth Product
(Note 5)
f = 10kHz
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
650
550
500
1000
●
●
kHz
kHz
kHz
Slew Rate
(Note 7)
AV = – 1, RL = ∞
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
0.210
0.185
0.170
0.35
●
●
V/µs
V/µs
V/µs
SR
●
20
150
UNITS
µA
±15V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise
specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4)
LT1637C/LT1637I
MIN
TYP
MAX
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8, S8 Packages
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
●
●
MS8 Package
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
●
●
DD Package
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
●
●
N8, S8 Packages, – 40°C ≤ TA ≤ 85°C
MS8 Package, – 40°C ≤ TA ≤ 85°C
DD Package, – 40°C ≤ TA ≤ 85°C
Input Offset Voltage Drift (Note 9)
IOS
Input Offset Current
IB
Input Bias Current
UNITS
100
450
650
800
µV
µV
µV
100
450
800
1150
µV
µV
µV
125
650
1000
1150
µV
µV
µV
●
●
●
1
2
2
3
6
6
µV/°C
µV/°C
µV/°C
●
1
6
nA
17
50
●
nA
Input Noise Voltage
0.1Hz to 10Hz
0.6
µVP-P
en
Input Noise Voltage Density
f = 1kHz
27
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.08
pA/√Hz
RIN
Input Resistance
Differential
Common Mode, VCM = – 15V to 14V
3
2200
MΩ
MΩ
CIN
Input Capacitance
1
4
Input Voltage Range
●
– 15
pF
29
V
CMRR
Common Mode Rejection Ratio
VCM = – 15V to 29V
●
80
110
dB
AVOL
Large-Signal Voltage Gain
VO = ±14V, RL = 10k
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
100
75
50
400
●
●
V/mV
V/mV
V/mV
No Load
ISINK = 5mA
ISINK = 10mA
●
●
●
VOL
Output Voltage Swing LOW
– 14.997
– 14.680
– 14.420
– 14.95
– 14.25
– 13.65
V
V
V
1637fd
4
LT1637
±15V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise
specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4)
LT1637C/LT1637I
MIN
TYP
MAX
SYMBOL
PARAMETER
CONDITIONS
VOH
Output Voltage Swing HIGH
No Load
ISOURCE = 5mA
ISOURCE = 10mA
●
●
●
14.9
14.2
13.7
14.967
14.667
14.440
V
V
V
ISC
Short-Circuit Current (Note 2)
Short Output to GND
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
±25
±20
±15
±31.7
●
●
mA
mA
mA
VS = ±1.5V to ±22V
●
90
115
dB
PSRR
Power Supply Rejection Ratio
IS
±1.35
V
230
300
370
µA
µA
●
Minimum Supply Voltage
Supply Current
●
ISHDN
UNITS
Positive Supply Current, SHDN
VPIN5 = – 20V, VS = ±22V, No Load
●
6
40
µA
Shutdown Pin Current
VPIN5 = – 21.7V, VS = ±22V, No Load
VPIN5 = – 20V, VS = ±22V, No Load
●
●
0.3
0.9
15
8
nA
µA
Maximum Shutdown Pin Current
VPIN5 = 32V, VS = ±22V
●
20
150
µA
0.02
2
µA
Output Leakage Current, SHDN
VPIN5 = – 20V, VS = ±22V, No Load
●
VL
Shutdown Pin Input Low Voltage
VS = ±22V
●
VH
Shutdown Pin Input High Voltage
VS = ±22V
●
tON
Turn-On Time
VPIN5 = – 10V to – 15V, RL = 10k
35
µs
tOFF
Turn-Off Time
VPIN5 = – 15V to – 10V, RL = 10k
3
µs
GBW
Gain-Bandwidth Product
f = 10kHz
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
750
650
600
1100
●
●
kHz
kHz
kHz
AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
0.225
0.200
0.180
0.4
●
●
V/µs
V/µs
V/µs
SR
Slew Rate
– 21.7
– 21.6
– 20.8
V
–20.0
V
1637fd
5
LT1637
U
3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and
–55°C ≤ TA ≤ 125°C for LT1637MP. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
LT1637H/LT1637MP
MIN
TYP
MAX
CONDITIONS
100
●
IOS
IB
UNITS
450
3
µV
mV
Input Offset Voltage Drift (Note 9)
●
10
µV/°C
Input Offset Current
VCM = 44V (Note 5)
●
●
15
10
nA
µA
VCM = 44V (Note 5)
●
●
150
100
nA
µA
44
V
Input Bias Current
Input Voltage Range
CMRR
Common Mode Rejection Ratio
(Note 5)
VCM = 0.3V to (VCC – 1V)
VCM = 0.3V to 44V
AVOL
Large-Signal Voltage Gain
VS = 3V, VO = 500mV to 2.5V, RL = 10k
3
●
0.3
●
●
72
74
150
20
400
●
V/mV
V/mV
300
35
800
●
V/mV
V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
dB
dB
VOL
Output Voltage Swing LOW
No Load
ISINK = 5mA
VS = 5V, ISINK = 10mA
●
●
●
VOH
Output Voltage Swing HIGH
VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
●
●
2.90
2.05
V
V
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
●
●
4.90
3.50
V
V
VS = 3V to 12.5V, VCM = VO = 1V
●
80
dB
●
2.7
V
●
23
V
PSRR
Power Supply Rejection Ratio
Minimum Supply Voltage
IS
ISHDN
GBW
SR
Reverse Supply Voltage
IS = – 100µA
Supply Current
(Note 6)
15
900
1500
mV
mV
mV
●
250
400
µA
µA
190
Supply Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
15
µA
Shutdown Pin Current
VPIN5 = 0.3V, No Load (Note 6)
VPIN5 = 2V, No Load (Note 5)
●
●
200
7
nA
µA
Output Leakage Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
5
µA
Maximum Shutdown Pin Current
VPIN5 = 32V, No Load (Note 5)
●
200
µA
Gain-Bandwidth Product
f = 10kHz (Note 5)
Slew Rate
650
350
1000
●
kHz
kHz
0.210
0.1
0.35
●
V/µs
V/µs
AV = – 1, RL = ∞ (Note 7)
1637fd
6
LT1637
±15V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and
–55°C ≤ TA ≤ 125°C for LT1637MP. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V –, unless otherwise specified. (Note 4)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
LT1637H/LT1637MP
MIN
TYP
MAX
CONDITIONS
100
●
UNITS
550
3.4
µV
mV
Input Offset Voltage Drift (Note 9)
●
11
µV/°C
IOS
Input Offset Current
●
25
nA
IB
Input Bias Current
●
250
nA
CMRR
Common Mode Rejection Ratio
VCM = –14.7V to 29V
AVOL
Large-Signal Voltage Gain
VO = ±14V, RL = 10k
3
●
72
●
100
4
Output Voltage Swing
No Load
IOUT = ±5mA
IOUT= ±10mA
●
●
●
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to 22V
●
84
●
±1.35
Minimum Supply Voltage
Supply Current
V
V
V
dB
V
230
●
ISHDN
V/mV
V/mV
±14.8
±14.0
±13.4
VO
IS
dB
400
300
500
µA
µA
Positive Supply Current, SHDN
VPIN5 = –20V, VS = ±22V, No Load
●
60
µA
Shutdown Pin Current
VPIN5 = –21.7V, VS = ±22V, No Load
VPIN5 = –20V, VS = ±22V, No Load
●
●
200
10
nA
µA
Maximum Shutdown Pin Current
VPIN5 = 32V, VS = ±22V
●
200
µA
Output Leakage Current, SHDN
VPIN5 = –20V, VS = ±22V, No Load
●
100
µA
VL
Shutdown Pin Input Low Voltage
VS = ±22V
●
–21.7
V
VH
Shutdown Pin Input High Voltage
VS = ±22V
●
–20
GBW
Gain-Bandwidth Product
f = 10kHz
750
400
1100
●
kHz
kHz
0.225
0.1
0.4
●
V/µs
V/µs
SR
Slew Rate
AV = – 1, RL = ∞, VO = ±10V,
Measure at VO = ±5V
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. The θJA specified for the DD package is with
minimal PCB heat spreading metal. Using expanded metal area on all layers
of a board reduces this value.
Note 3: The LT1637C and LT1637I are guaranteed functional over the
operating temperature range of – 40°C to 85°C. The LT1637H is guaranteed
functional over the operating temperature range of –40°C to 125°C. The
LT1637MP is guaranteed functional over the operating temperature range
–55°C to 125°C.
Note 4: The LT1637C is guaranteed to meet specified performance from
0°C to 70°C. The LT1637C is designed, characterized and expected to meet
V
specified performance from – 40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1637I is guaranteed to meet
specified performance from – 40°C to 85°C. The LT1637H is guaranteed to
meet specified performance from –40°C to 125°C and the LT1637MP is
guaranteed to meet specified performance from –55°C to 125°C.
Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and
VS = ±15V or VS = ±22V tests.
Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and
VS = ±15V or VS = ±22V tests.
Note 7: Guaranteed by correlation to slew rate at VS = ±15V and GBW at
VS = 3V and VS = ±15V tests.
Note 8: This specification implies a typical input offset voltage of 650µV at
VCM = 44V and a maximum input offset voltage of 5.4mV at VCM = 44V.
Note 9: This parameter is not 100% tested.
1637fd
7
LT1637
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
300
TA = 125°C
200
TA = 25°C
150
TA = –55°C
100
50
0
40
300
30
200
100
0
TA = 125°C
–100
TA = –55°C
–200
–300
10
20
30
40
TOTAL SUPPLY VOLTAGE (V)
0.08
0.04
1
2
3
4
TOTAL SUPPLY VOLTAGE (V)
5
4
1
Output Saturation Voltage
vs Input Overdrive
10
OUTPUT SATURATION VOLTAGE (V)
TA = 25°C
TA = – 55°C
0.01
0.1
1
10
0.0001 0.001 0.01
SOURCING LOAD CURRENT (mA)
100
100
VS = 5V, 0V
VOD = 30mV
1
0.1
TA = 125°C
TA = 25°C
0.01
TA = – 55°C
0.001
0.1
1
10
0.0001 0.001 0.01
SINKING LOAD CURRENT (mA)
1637 G04
3
4 5 6
TIME (s)
7
8
50
40
30
9
10
1637 G07
OUTPUT HIGH
20
10
OUTPUT LOW
0
10 20 30 40 50 60 70 80 90 100
INPUT OVERDRIVE (mV)
Input Noise Current vs Frequency
1.4
INPUT NOISE CURRENT DENSITY (pA/√Hz)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
NOISE VOLTAGE (200nV/DIV)
2
60
Noise Voltage Density
vs Frequency
VS = ±15V
60
50
40
30
20
1
70
1637 G06
70
0
80
0
100
VS = 5V, 0V
NO LOAD
90
1637 G05
0.1Hz to 10Hz Noise Voltage
VS = ± 2.5V
4.2 4.4 4.6 4.8 5 10 20 30 40 50
COMMON MODE VOLTAGE (V)
1637 G03
Output Saturation Voltage
vs Load Current (Output Low)
TA = 125°C
TA = 25°C
0
1637 G02
Output Saturation Voltage
vs Load Current (Output High)
0.1
TA = 125°C
0.04
0.08
0
VS = 5V, 0V
VOD = 30mV
TA = –55°C
0.12
TA = 25°C
1637 G01
OUTPUT SATURATION VOLTAGE (V)
10
–400
0
VS = 5V, 0V
20
OUTPUT SATURATION VOLTAGE (mV)
SUPPLY CURRENT (µA)
350
400
INPUT BIAS CURRENT (µA)
CHANGE IN INPUT OFFSET VOLTAGE (µV)
400
250
Input Bias Current
vs Common Mode Voltage
Minimum Supply Voltage
1
10
100
FREQUENCY (Hz)
1000
1637 G08
VS = ±15V
1.2
1.0
0.8
0.6
0.4
0.2
0
1
10
100
FREQUENCY (Hz)
1000
1637 G09
1637fd
8
LT1637
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Open-Loop Gain and Phase Shift
vs Frequency
Gain-Bandwidth Product
vs Temperature
VS = ±2.5V
80
PHASE
40
60
30
40
GAIN
20
20
10
0
0
PHASE SHIFT (DEG)
GAIN (dB)
50
100
–10
–20
1300
0.7
1200
0.6
1000
–30
1k
10k
100k
FREQUENCY (Hz)
VS = ±15V
1100
VS = ±1.5V
900
700
– 50 –25
1M
50
25
75
0
TEMPERATURE (°C)
100
1637 G10
50
PHASE MARGIN
45
40
GAIN BANDWIDTH
1100
35
1050
30
5
10 15 20 25 30 35 40
TOTAL SUPPLY VOLTAGE (V)
45
COMMON MODE REJECTION RATIO (dB)
1250
0
25
80
VS = ±15V
70
60
VS = ±1.5V
50
40
30
20
10
50
75
25
TEMPERATURE (°C)
100
70
60
POSITIVE SUPPLY
50
40
30
NEGATIVE SUPPLY
20
10
0
10k
100k
FREQUENCY (Hz)
1M
1k
10k
100k
FREQUENCY (Hz)
1M
1637 G15
Undistorted Output Swing
vs Frequency
Output Impedance vs Frequency
10k
35
VS = ± 2.5V
30
PHASE MARGIN
125
VS = ± 2.5V
80
1637 G14
45
Vs = ±15V
DISTORTION ≤ 1%
AV = 1
1100
35
1000
30
GAIN BANDWIDTH
900
25
800
20
700
100
AV = 100
10
AV = 10
1
AV = 1
OUTPUT SWING (VP-P)
40
OUTPUT IMPEDANCE (Ω)
1k
1200
10
100k
1637 G16
0.1
100
1k
25
20
15
10
5
15
10k
LOAD RESISTANCE (Ω)
0
–10
1k
50
VS = ± 2.5V
– 25
1637 G12
0
PHASE MARGIN (DEG)
GAIN-BANDWIDTH PRODUCT (kHz)
1400
1k
FALLING, VS = ±1.5V
PSRR vs Frequency
90
Gain-Bandwidth Product and
Phase Margin vs Load Resistance
600
0.3
90
1637 G13
1300
FALLING, VS = ±15V
0.1
– 50
125
100
PHASE MARGIN (DEG)
GAIN-BANDWIDTH PRODUCT (kHz)
55
1150
RISING, VS = ±1.5V
0.4
CMRR vs Frequency
1300
1000
0.5
1637 G11
Gain-Bandwidth Product and
Phase Margin vs Supply Voltage
1200
RISING, VS = ±15V
0.2
800
POWER SUPPLY REJECTION RATIO (dB)
60
Slew Rate vs Temperature
SLEW RATE (V/µs)
120
GAIN-BANDWIDTH PRODUCT (kHz)
70
10k
100k
FREQUENCY (Hz)
1M
1637 G17
0
100
Vs = ± 2.5V
1k
10k
FREQUENCY (Hz)
100k
1637 G18
1637fd
9
LT1637
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Capacitive Load Handling,
Overshoot vs Capacitive Load
Settling Time to 0.1%
vs Output Step
100
VS = ±15V
8
90
80
AV = – 1
AV = 1
OVERSHOOT (%)
OUTPUT STEP (V)
6
4
2
0
–2
–4
AV = 1
–6
10
VS = ±2.5V
NO OUTPUT COMPENSATION
AV = – 1
AV = 1
60
AV = 5
50
AV = 10
40
30
20
–8
VS = 3V, 0V
VOUT = 1.8VP-P
VCM = 1.2V
RL =10k
1
AV = 2
70
THD + NOISE (%)
10
Total Harmonic Distortion + Noise
vs Frequency
0.1
0.01
AV = –1
0.001
AV = 1
10
–10
0
10
0
30
20
SETTLING TIME (µs)
40
0.0001
10
100
1000
CAPACITIVE LOAD (pF)
10000
Total Harmonic Distortion + Noise
vs Load Resistance
10
VS = 3V, 0V
VIN = 0.6V TO 2.4V
0.01
1637 G21
RL = 10k
VCM = HALF SUPPLY
f = 1kHz
FOR AV = –1, RG = 100k
1
THD + NOISE (%)
THD + NOISE (%)
0.1
100k
Total Harmonic Distortion + Noise
vs Output Voltage
VS = 3V TOTAL
AV = 1
VIN = 1.8VP-P AT 1kHz
VS = ±1.5V
VIN = ±0.9V
1k
10k
FREQUENCY (Hz)
1637 G20
1637 G19
1
100
10
0.001
AV = 1
VS = 3V, 0V
AV = –1
VS = ±1.5V
AV = 1
VS = ±1.5V
0.1
AV = 1
VS = 3V, 0V
0.01
VS = 3V, 0V
VIN = 0.3V TO 2.1V
AV = –1, VS = 3V, 0V
0.001
0.0001
100
1k
10k
LOAD RESISTANCE TO GROUND (Ω)
0
100k
1
2
OUTPUT VOLTAGE (VP-P)
1637 G23
1637 G22
CHANGE IN INPUT OFFSET VOLTAGE
(50µV/DIV)
Open-Loop Gain
Large-Signal Response
Small-Signal Response
VS = ±15V
AV = – 1
VS = ±15V
VS = ±15V
AV = 1
10V
A
A
B
C
3
50mV
B
C
– 50mV
A: RL = 2k
B: RL = 10k
C: RL = 50k
–10V
0V
10V
OUTPUT VOLTAGE (5V/DIV)
– 10V
1637 G24
1637 G25
1637 G26
1637fd
10
LT1637
U
W
U
U
APPLICATIO S I FOR ATIO
Supply Voltage
The positive supply pin of the LT1637 should be bypassed
with a small capacitor (about 0.01µF) within an inch of the
pin. When driving heavy loads an additional 4.7µF electrolytic capacitor should be used. When using split supplies,
the same is true for the negative supply pin.
The LT1637 is protected against reverse battery voltages
up to 25V. In the event a reverse battery condition occurs,
the supply current is typically less than 1nA.
When operating the LT1637 on total supplies of 30V or
more, the supply must not be brought up faster than 1µs.
This is especially true if low ESR bypass capacitors are
used. A series RLC circuit is formed from the supply lead
inductance and the bypass capacitor. 5Ω of resistance in
the supply or the bypass capacitor will dampen the tuned
circuit enough to limit the rise time.
Inputs
The LT1637 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 Common
Mode typical performance curve.
For input voltages about 0.9V or more below V +, the PNP
input stage is active and the input bias current is typically
– 20nA. When the input voltage is about 0.5V or less from
V +, the NPN input stage is operating and the input bias
current is typically 80nA. Increases in temperature will
cause the voltage at which operation switches from the
PNP stage to the NPN stage to move towards V +. The input
offset voltage of the NPN stage is untrimmed and is
typically 600µV.
A Schottky diode in the collector of each NPN transistor of
the NPN input stage allows the LT1637 to operate with
either or both of its inputs above V +. At about 0.3V above
V + the NPN input transistor is fully saturated and the input
bias current is typically 23µA at room temperature. The
input offset voltage is typically 600µV when operating
above V +. The LT1637 will operate with its input 44V above
V – regardless of V +.
The inputs are protected against excursions as much as
22V below V – by an internal 1.3k resistor in series with
each input and a diode from the input to the negative
supply. There is no output phase reversal for inputs up to
5V below V –. There are no clamping diodes between the
inputs and the maximum differential input voltage is 44V.
Output
The output voltage swing of the LT1637 is affected by
input overdrive as shown in the typical performance
curves. When monitoring input voltages within 100mV of
V +, gain should be taken to keep the output from clipping.
The output of the LT1637 can be pulled up to 25V beyond
V + with less than 1nA of leakage current, provided that V +
is less than 0.5V.
The normally reverse biased substrate diode from the
output to V – will cause unlimited currents to flow when the
output is forced below V –. If the current is transient and
limited to 100mA, no damage will occur.
The LT1637 is internally compensated to drive at least
200pF of capacitance under any output loading conditions. 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 4700pF, at all
output currents.
Distortion
There are two main contributors of distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current and distortion caused by
nonlinear common mode rejection. Of course, if the op
amp is operating inverting there is no common mode
induced distortion. When the LT1637 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 LT1637 should be
operated single supply, with the output always sourcing
current and with the input voltage swing between ground
and (V + – 0.9V). See the Typical Performance Characteristics curves.
1637fd
11
LT1637
U
U
W
U
APPLICATIO S I FOR ATIO
The shutdown pin can be taken up to 32V above V –. The
shutdown pin can be driven below V –, however the pin
current through the substrate diode should be limited with
an external resistor to less than 10mA.
Gain
The open-loop gain is less sensitive to load resistance
when the output is sourcing current. This optimizes performance in single supply applications where the load is
returned to ground. The typical performance photo of
Open-Loop Gain for various loads shows the details.
Input Offset Nulling
The input offset voltage can be nulled by placing a 10k
potentiometer between Pins 1 and 8 with its wiper to V –
(see Figure 1). The null range will be at least ±3mV.
Shutdown
The LT1637 can be shut down two ways: using the
shutdown pin or bringing V + to within 0.5V of V –. When V +
is brought to within 0.5V of V – both the supply current and
output leakage current drop to less than 10nA. When the
shutdown pin is brought 1.2V above V –, the supply
current drops to about 3µA and the output leakage current
is less than 1µA, independent of V +. In either case the input
bias current is less than 0.1nA (even if the inputs are 44V
above the negative supply).
LT1637
8
1
10k
V–
1637 F01
Figure 1. Input Offset Nulling
W
W
SI PLIFIED SCHE ATIC
7 V+
Q1
Q13
D1
– IN
SHDN
10µA
Q25
Q23
R3
1.3k
R2
6k
5
Q19
D2
2
Q2
R1
1M
D3
Q21
R4
1.3k
+ IN
Q9
Q10
Q14 Q15
Q18
Q20
Q24
6 OUT
Q22
3
Q11
Q12
Q17
Q16
Q26
Q3
Q4
Q5
Q6 Q7
Q8
D4
D5
NULL
R5
7k
R6
7k
R7
400Ω
R8
400Ω
1
8 NULL
4 V–
1637 SS
1637fd
12
LT1637
U
TYPICAL APPLICATIO S
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
Positive Supply Rail Current Sense
5V
+
VIN
200Ω
LT1637
CL ≤ 4700pF
–
0.2Ω
+
LOAD
Q1
2N3904
LT1637
200Ω
–
0.22µF
0V TO 4.3V
150Ω
2k
ILOAD
1637 TA03
1637 TA02
VOUT = (2Ω)(ILOAD)
Lamp Outage Detector
3V
5V TO 44V
1M
LAMP
ON/OFF
100k
5k
0.5Ω
–
LT1637
OUT
+
OUT = 0V FOR GOOD BULB
3V FOR OPEN BULB
1637 TA05
Over-The-Top Comparator with Hysteresis
Over-The-Top Current Sense
3V TO 44V
R1
200Ω
1M
3V TO 44V
IN1
(0V TO 44V)
10k
3V
+
VOUT
LT1637
–
RS
0.2Ω
+
LT1637
1M
–
1M
2N5087
IN2
(0V TO 44V)
10k
ILOAD
1M
LOAD
V
HYSTERESIS = CC
100
2N5210
ILOAD =
VOUT
(RS)(R2/R1)
Q1
2N3904
VOUT
(0V TO 2.7V)
R2
2k
1637 TA06
1637 TA04
1637fd
13
LT1637
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115
TYP
5
0.38 ± 0.10
8
0.675 ±0.05
1.65 ± 0.10
(2 SIDES)
3.00 ±0.10
(4 SIDES)
3.5 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
PACKAGE
OUTLINE
(DD) DFN 1203
0.75 ±0.05
0.200 REF
0.25 ± 0.05
4
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
1
0.50 BSC
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.42 ± 0.038
(.0165 ± .0015)
TYP
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.65
(.0256)
BSC
8
7 6 5
0.52
(.0205)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ± 0.152
(.021 ± .006)
DETAIL “A”
1
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.127 ± 0.076
(.005 ± .003)
MSOP (MS8) 0204
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
1637fd
14
LT1637
U
PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
.255 ± .015*
(6.477 ± 0.381)
.300 – .325
(7.620 – 8.255)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
(
+.035
.325 –.015
8.255
+0.889
–0.381
.130 ± .005
(3.302 ± 0.127)
.045 – .065
(1.143 – 1.651)
)
.120
(3.048) .020
MIN (0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
N8 1002
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
8
.245
MIN
7
6
5
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
1637fd
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1637
U
TYPICAL APPLICATIO S
Sample-and-Hold
3V
VIN
3V
+
+
LT1637
–
0.22µF
SHDN
VSAMPLE
LT1636
150Ω
VOUT
–
3V
1637 TA07
0V
DROOP (LT1636 BUFFER): 200mV/s
DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s
MUX Amplifier
MUX Amplifier Waveforms
5V
VIN1
5kHz AT 4VP-P
+
VOUT
LT1637
–
VOUT
2V/DIV
SHDN
5V
–
INPUT
SELECT
5V/DIV
LT1637
VIN2
10kHz AT 2VP–P
+
0.2ms/DIV
SHDN
1637 TA08
INPUT SELECT
1kHz AT 5VP–P
74HC04
1637 TA09
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PART NUMBER
DESCRIPTION
COMMENTS
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Micropower, Over-The-Top, SOT-23, Rail-to-Rail
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LT1783
1.2MHz, Over-The-Top, Micropower, Rail-to-Rail
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1637fd
16
Linear Technology Corporation
LT 0107 REV D • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
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www.linear.com
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