FEATURES
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LT1638/LT1639
1.2MHz, 0.4V/μs
Over-The-Top Micropower
Rail-to-Rail Input and Output
Op Amps
DESCRIPTIO
The LT
®
1638 is a low power dual rail-to-rail input and output
operational amplifier available in the standard 8-pin PDIP and
SO packages as well as the 8-lead MSOP package. The
LT1639 is a low power quad rail-to-rail input and output
operational amplifier offered in the standard 14-pin PDIP and
surface mount packages. For space limited applications the
LT1638 is available in a 3mm x 3mm x 0.8mm dual fine pitch
leadless package (DFN).
The LT1638/LT1639 op amps operate on all single and
split supplies with a total voltage of 2.5V to 44V drawing
only 170μA of quiescent current per amplifier. These
amplifiers are reverse battery protected and draw no
current for reverse supply up to 18V.
The input range of the LT1638/LT1639 includes both
supplies, and a unique feature of this device is its capability
to operate over the top with either or both of its inputs
above V
+
. The inputs handle 44V, both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring when the inputs are below
the negative supply. Protective resistors are included in
the input leads so that current does not become excessive
when the inputs are forced below the negative supply. The
LT1638/LT1639 can drive loads up to 25mA and still
maintain rail-to-rail capability. The op amps are unity-gain
stable and drive all capacitive loads up to 1000pF when
optional output compensation is used.
Output Voltage vs Input Voltage
Operates with Inputs Above V
+
Rail-to-Rail Input and Output
Low Power: 230
μ
A per Amplifier Max
Gain Bandwidth Product: 1.2MHz
Slew Rate: 0.4V/μs
High Output Current: 25mA Min
Specified on 3V, 5V and
±15V
Supplies
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
Single Supply Input Range: – 0.4V to 44V
High CMRR: 98dB
No Phase Reversal
Available in 14-Lead SO, 8-Lead MSOP and DFN
Packages
APPLICATIO S
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Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
, 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.
TYPICAL APPLICATIO
10k
V1
V
CC
1M
Over-The-Top
®
Comparator with
100mV Hysteresis Centered at 0mV
V
CC
1M
V
CC
5V
+
A
1/2 LT1638
+
B
1/2 LT1638
1M
V0
–
10k
V2
1M
–
0V
1638/39 TA01
V
CC
= 5V, V
CM
= 0V TO 44V, t
PD
= 27μs
U
U
U
20mV/DIV
1638/39 TA02
16389fd
1
LT1638/LT1639
ABSOLUTE
MAXIMUM
RATINGS
Total Supply Voltage (V
+
to V
–
) .............................. 44V
Input Differential Voltage ......................................... 44V
Input Current ......................................................
±25mA
Output Short-Circuit Duration (Note 2) .........Continuous
Operating Temperature Range (Note 3)
LT1638C/LT1639C ............................. – 40°C to 85°C
LT1638I/LT1639I ................................ – 40°C to 85°C
LT1638H/LT1639H ........................... – 40°C to 125°C
PACKAGE/ORDER INFORMATION
ORDER
PART NUMBER
TOP VIEW
TOP VIEW
OUT A
–IN A
+IN A
V
–
1
2
3
4
8
7
6
5
V+
OUT B
–IN B
+IN B
LT1638CMS8
LT1638IMS8
MS8 PART
MARKING*
LTCY
A
B
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 300°C/W (MS8)
ORDER
PART NUMBER
TOP VIEW
OUT A
–IN A
+IN A
V
–
1
2
3
4
A
B
8
7
6
5
V
+
OUT B
–IN B
+IN B
LT1638CDD
LT1638IDD
DD PART MARKING*
LAAL
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 160°C/W (NOTE 10)
UNDERSIDE METAL INTERNALLY CONNECTED TO V
–
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
*The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
W W
U
W
(Note 1)
Specified Temperature Range (Note 4)
LT1638C/LT1639C ............................. – 40°C to 85°C
LT1638I/LT1639I ................................ – 40°C to 85°C
LT1638H/LT1639H ........................... – 40°C to 125°C
Junction Temperature ........................................... 150°C
DD Package ...................................................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
DD Package ...................................... – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER
PART NUMBER
OUT A
–IN A
+IN A
V
–
1
2
A
3
B
4
5
+IN B
6
–IN B
8
7
V
+
OUT B
LT1638CN8
LT1638IN8
LT1638CS8
LT1638IS8
LT1638HS8
S8 PART MARKING
1638
1638I
1638H
ORDER
PART NUMBER
LT1639CN
LT1639IN
LT1639CS
LT1639IS
LT1639HS
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S8)
TOP VIEW
OUT A
–IN A
+IN A
V
+
1
2
3
4
5
6
7
B
C
A
D
14 OUT D
13 –IN D
12 +IN D
11 V
–
10 +IN C
9
8
– IN C
OUT C
+IN B
–IN B
OUT B
N PACKAGE
14-LEAD PDIP
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 160°C/W (S)
16389fd
LT1638/LT1639
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= 3V, 0V; V
S
= 5V, 0V; V
CM
= V
OUT
= half supply, unless otherwise noted. (Note 4)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
LT1638 N, S Packages
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
LT1639 N, S Packages
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
LT1638 MS8 Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
LT1638 DD Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
Input Offset Voltage Drift
(Note 9)
I
OS
I
B
Input Offset Current
V
CM
= 44V (Note 5)
Input Bias Current
V
CM
= 44V (Note 5)
V
S
= 0V
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= 0V to 44V
●
●
●
●
●
●
●
LT1638C/LT1639C, LT1638I/LT1639I
MIN
TYP
MAX
200
600
850
950
300
700
950
1050
350
900
1150
1450
1100
1350
1450
6
7
6
2.5
50
30
UNITS
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV/°C
μV/°C
nA
μA
nA
μA
nA
μV
P-P
nV/√Hz
pA/√Hz
MΩ
MΩ
400
●
●
●
●
●
●
●
●
LT1638/LT1639 N, S Packages
LT1638MS8, LT1638DD
2
2.5
1
20
8
0.1
1
20
0.3
1
1.4
0
88
80
200
133
100
400
250
200
98
88
1500
2.5
5.5
5
Input Noise Voltage
e
n
i
n
R
IN
C
IN
CMRR
A
VOL
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Large-Signal Voltage Gain
44
pF
V
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
V
CM
= 0V to V
CC
– 1V
V
CM
= 0V to 44V (Note 8)
V
S
= 3V, V
O
= 500mV to 2.5V, R
L
= 10k
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
V
S
= 5V, V
O
= 500mV to 4.5V, R
L
= 10k
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
V
S
= 3V, No Load
V
S
= 3V, I
SINK
= 5mA
V
S
= 5V, No Load
V
S
= 5V, I
SINK
= 10mA
●
●
●
●
●
●
●
●
●
●
●
●
●
●
1500
V
OL
Output Voltage Swing Low
3
250
3
500
2.94
2.25
4.94
3.8
10
15
15
15
2.98
2.40
4.98
4.0
15
25
20
25
8
450
8
700
mV
mV
mV
mV
V
V
V
V
mA
mA
mA
mA
V
OH
Output Voltage Swing High
V
S
= 3V, No Load
V
S
= 3V, I
SOURCE
= 5mA
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
16389fd
3
LT1638/LT1639
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= 3V, 0V; V
S
= 5V, 0V; V
CM
= V
OUT
= half supply, unless otherwise noted. (Note 4)
SYMBOL
PSRR
PARAMETER
Power Supply Rejection Ratio
Reverse Supply Voltage
Minimum Operating Supply Voltage
I
S
GBW
Supply Current per Amplifier
(Note 6)
Gain Bandwidth Product
(Note 5)
Slew Rate
(Note 7)
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
CONDITIONS
V
S
= 3V to 12.5V, V
CM
= V
O
= 1V
I
S
= – 100μA per Amplifier
LT1638C/LT1639C, LT1638I/LT1639I
MIN
TYP
MAX
●
90
100
●
●
●
●
●
●
●
UNITS
dB
V
V
μA
μA
kHz
kHz
kHz
V/μs
V/μs
V/μs
18
27
2.4
170
2.7
230
275
SR
650
550
500
0.210
0.185
0.170
1075
0.38
The
●
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
=
±
15V, V
CM
= 0V, V
OUT
= 0V, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
LT1638 N, S Packages
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
LT1639 N, S Packages
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
LT1638 MS8 Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
LT1638 DDPackage
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
Input Offset Voltage Drift
(Note 9)
I
OS
I
B
e
n
i
n
R
IN
C
IN
CMRR
A
VOL
Input Offset Current
Input Bias Current
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
●
MIN
●
●
TYP
250
350
●
●
MAX
800
1000
1100
900
1100
1200
1050
1250
1550
1250
1450
1550
6
7
6
50
UNITS
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV/°C
μV/°C
nA
nA
μV
P-P
nV/√Hz
pA/√Hz
MΩ
MΩ
pF
400
●
●
450
●
●
●
●
●
●
LT1638/LT1639 N, S Packages
LT1638MS8, LT1638DD
2
2.5
1
20
1
20
1
0.3
2.5
500
4.5
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= – 15V to 14V
V
CM
= –15V to 29V
V
O
=
±14V,
R
L
= 10k
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
No Load
I
OUT
=
±10mA
●
●
●
●
●
– 15
80
200
125
100
±14.9
±13.7
29
88
500
V
dB
V/mV
V/mV
V/mV
V
V
V
O
Output Voltage Swing
±14.95
±14.0
16389fd
4
LT1638/LT1639
ELECTRICAL CHARACTERISTICS
SYMBOL
I
SC
PARAMETER
Short-Circuit Current (Note 2)
The
●
denotes the specifications which apply over the specified temperature
range, otherwise specifications are at T
A
= 25°C. V
S
=
±
15V, V
CM
= 0V, V
OUT
= 0V, unless otherwise noted. (Note 4)
LT1638C/LT1639C, LT1638I/LT1639I
CONDITIONS
Short to GND
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
V
S
=
±1.5V
to
±22V
●
●
●
●
MIN
25
20
15
90
TYP
40
MAX
UNITS
mA
mA
mA
dB
PSRR
I
S
GBW
Power Supply Rejection Ratio
Supply Current per Amplifier
Gain Bandwidth Product
100
205
280
350
μA
μA
kHz
kHz
kHz
V/μs
V/μs
V/μs
f = 5kHz
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
A
V
= – 1, R
L
=
∞,
V
O
=
±10V,
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
●
●
●
●
750
650
600
0.225
0.2
0.18
1200
SR
Slew Rate
0.4
The
●
denotes the specifications which apply over the full operating temperature range of –40°C
≤
T
A
≤
125°C.
V
S
= 3V, 0V; V
S
= 5V, 0V; V
CM
= V
OUT
= Half Supply unless otherwise specified. (Note 4)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
LT1638S8
●
LT1639S
●
Input Offset Voltage Drift (Note 9)
I
OS
I
B
Input Offset Current
V
CM
= 44V (Note 5)
Input Bias Current
V
CM
= 44V (Note 5)
CMRR
A
VOL
Input Voltage Range
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
CM
= 0.3V to V
CC
– 1V
V
CM
= 0.3V to 44V
V
S
= 3V, V
O
= 500mV to 2.5V, R
L
= 10k
V
S
= 5V, V
O
= 500mV to 4.5V, R
L
= 10k
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
= 5mA
V
S
= 5V, No Load
V
S
= 5V, I
SOURCE
= 10mA
PSRR
Power Supply Rejection Ratio
Minimum Supply Voltage
Reverse Supply Voltage
Supply Current
(Note 6)
Gain Bandwidth Product
(Note 5)
Slew Rate
(Note 7)
V
S
= 3V to 12.5V, V
CM
= V
O
= 1V
I
S
= – 100μA
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
LT1638H/LT1639H
MIN
TYP
MAX
200
650
3
300
750
3.2
15
15
10
150
100
0.3
76
72
200
20
400
35
44
UNITS
μV
mV
μV
mV
μV/°C
nA
μA
nA
μA
V
dB
dB
V/mV
V/mV
V/mV
V/mV
mV
mV
mV
1500
1500
15
900
1500
V
OH
Output Voltage Swing High
2.9
2
4.9
3.5
80
2.7
18
170
230
450
V
V
V
V
dB
V
V
μA
μA
kHz
kHz
V/μs
V/μs
16389fd
I
S
GBW
SR
f = 5kHz
●
A
V
= – 1, R
L
=
∞
●
650
350
0.21
0.1
1075
0.38
5
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