LTC6244
Dual 50MHz, Low Noise,
Rail-to-Rail, CMOS Op Amp
FEATURES
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DESCRIPTION
The LTC
®
6244 is a dual high speed, unity-gain stable CMOS
op amp that features a 50MHz gain bandwidth, 40V/μs slew
rate, 1pA of input bias current, low input capacitance and
rail-to-rail output swing. The 0.1Hz to 10Hz noise is just
1.5μV
P-P
and 1kHz noise is guaranteed to be less than
12nV/√Hz. This excellent AC and noise performance is
combined with wide supply range operation, a maximum
offset voltage of just 100μV and drift of only 2.5μV/°C,
making it suitable for use in many fast signal processing
applications, such as photodiode amplifiers.
This op amp has an output stage that swings within 35mV
of either supply rail to maximize the signal dynamic range
in low supply applications. The input common mode
range extends to the negative supply. It is fully specified
on 3V and 5V, and an HV version guarantees operation
on supplies of ±5V.
The LTC6244 is available in the 8-pin MSOP and for com-
,
pact designs, it is packaged in the tiny dual fine pitch lead
free (DFN) package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Input Bias Current: 1pA (Typ at 25°C)
Low Offset Voltage: 100μV Max
Low Offset Drift: 2.5μV/°C Max
0.1Hz to 10Hz Noise: 1.5μV
P-P
Slew Rate: 40V/μs
Gain Bandwidth Product: 50MHz
Output Swings Rail-to-Rail
Supply Operation:
2.8V to 6V LTC6244
2.8V to ±5.25V LTC6244HV
Low Input Capacitance: 2.1pF
Available in 8-Pin MSOP and Tiny DFN Packages
APPLICATIONS
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Photodiode Amplifiers
Charge Coupled Amplifiers
Low Noise Signal Processing
Active Filters
Medical Instrumentation
High Impedance Transducer Amplifier
TYPICAL APPLICATION
Very Low Noise Large Area Photodiode
0.25pF
5V
PHILIPS
BF862
JFET
5V
4.99k
–5V
4.7μF*
4.99k
V
BB
HAMAMATSU LARGE AREA
PHOTODIODE
S1227-1010BQ
C
PD
= 3000pF
* CAN BE MICROPHONIC, FILM, X7R, IF NEEDED.
I
PD
120
110
100
NUMBER OF UNITS
1M
V
OUT
= 1M • I
PD
BW = 350kHz
NOISE = 291nV AT 10kHz
V
OUT
90
80
70
60
50
40
30
–5V
6244 TA01a
20
10
0
–60
20
40
–40 –20
0
INPUT OFFSET VOLTAGE (μV)
60
6244 TA01b
V
OS
Distribution
LTC6244MS8
V
S
= 5V, 0V
V
CM
= 2.5V
T
A
= 25°C
–
1/2
LTC6244HV
+
6244fb
1
LTC6244
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V
+
to V
–
)
LTC6244..................................................................7V
LTC6244HV ...........................................................12V
Input Voltage.......................... (V
+
+ 0.3V) to (V
–
– 0.3V)
Input Current........................................................±10mA
Output Short Circuit Duration (Note 2)............. Indefinite
Operating Temperature Range
LTC6244C ............................................ –40°C to 85°C
LTC6244I.............................................. –40°C to 85°C
LTC6244H .......................................... –40°C to 125°C
Specified Temperature Range (Note 3)
LTC6244C ................................................ 0°C to 70°C
LTC6244I.............................................. –40°C to 85°C
LTC6244H .......................................... –40°C to 125°C
Junction Temperature ........................................... 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
–
9
A
B
8 V
+
7 OUT B
6 –IN B
5 +IN B
OUT A
–IN A
+IN A
V
–
1
2
3
4
TOP VIEW
8
7
6
5
V
+
OUT B
–IN B
+IN B
4
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 9) CONNEECTED TO V
–
(PCB CONNECTION OPTIONAL)
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC6244CDD#PBF
LTC6244HVCDD#PBF
LTC6244IDD#PBF
LTC6244HVIDD#PBF
LTC6244HDD#PBF
LTC6244HVHDD#PBF
LTC6244CMS8#PBF
LTC6244HVCMS8#PBF
LTC6244IMS8#PBF
LTC6244HVIMS8#PBF
LTC6244HMS8#PBF
TAPE AND REEL
LTC6244CDD#TRPBF
LTC6244HVCDD#TRPBF
LTC6244IDD#TRPBF
LTC6244HVIDD#TRPBF
LTC6244HDD#TRPBF
LTC6244HVHDD#TRPBF
LTC6244CMS8#TRPBF
LTC6244IMS8#TRPBF
LTC6244HVIMS8#TRPBF
LTC6244HMS8#TRPBF
PART MARKING
LCCF
LCGD
LCCF
LCGD
LCCF
LCGD
LTCCM
LTCCM
LTCGF
LTCCM
PACKAGE DESCRIPTION
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
LTC6244HVCMS8#TRPBF LTCGF
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/
6244fb
2
LTC6244
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Input Offset Voltage (Note 4)
(LTC6244C/I, LTC6244HVC/I) The
l
denotes the specifications which apply
over the specified temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 5V, 0V, V
CM
= 2.5V unless otherwise noted.
CONDITIONS
MS8 Package
0°C to 70°C
–40°C to 85°C
DD Package
0°C to 70°C
–40°C to 85°C
V
OS
Match Channel-to-Channel (Note 5) MS8 Package
0°C to 70°C
–40°C to 85°C
DD Package
0°C to 70°C
–40°C to 85°C
TC V
OS
I
B
I
OS
Input Offset Voltage Drift, MS8 (Note 6)
Input Bias Current (Notes 4, 7)
Input Offset Current (Notes 4, 7)
Input Noise Voltage
e
n
i
n
R
IN
C
IN
Input Noise Voltage Density
Input Noise Current Density (Note 8)
Input Resistance
Input Capacitance
Differential Mode
Common Mode
Input Voltage Range
Common Mode Rejection
CMRR Match
Channel-to-Channel (Note 5)
A
VOL
Large Signal Voltage Gain
V
O
= 1V to 4V
R
L
= 10k to V
S
/2
0°C to 70°C
–40°C to 85°C
V
O
= 1.5V to 3.5V
R
L
= 1k to V
S
/2
0°C to 70°C
–40°C to 85°C
V
OL
Output Voltage Swing Low (Note 9)
No Load
I
SINK
= 1mA
I
SINK
= 5mA
No Load
I
SOURCE
= 1mA
I
SOURCE
= 5mA
V
S
= 2.8V to 6V, V
CM
= 0.2V
Common Mode
f = 100kHz
3.5
2.1
Guaranteed by CMRR
0V ≤ V
CM
≤ 3.5V
l
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l
l
l
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l
l
l
l
l
l
l
l
MIN
TYP
40
MAX
100
225
300
650
800
950
160
275
325
800
900
1.1
2.5
75
UNITS
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
mV
μV/°C
pA
pA
pA
pA
μV
P-P
nV/√Hz
fA/√Hz
Ω
pF
pF
100
40
150
0.7
1
0.5
75
1.5
8
0.56
10
12
12
0.1Hz to 10Hz
f = 1kHz
V
CM
CMRR
0
74
72
1000
600
450
300
200
150
105
100
2500
3.5
V
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
l
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l
l
l
l
l
l
l
l
l
l
l
l
1000
15
40
150
15
45
175
75
73
2.8
25
35
6.25
105
100
35
75
300
35
75
325
mV
mV
mV
mV
mV
mV
dB
dB
V
mA
V
OH
Output Voltage Swing High (Note 9)
PSRR
Power Supply Rejection
PSRR Match
Channel-to-Channel (Note 5)
Minimum Supply Voltage (Note 10)
I
SC
I
S
Short-Circuit Current
Supply Current per Amplifier
7.4
mA
6244fb
3
LTC6244
ELECTRICAL CHARACTERISTICS
SYMBOL
GBW
SR
FPBW
t
s
PARAMETER
Gain Bandwidth Product
Slew Rate (Note 11)
Full Power Bandwidth (Note 12)
Settling Time
(LTC6244C/I, LTC6244HVC/I) The
l
denotes the specifications which apply
over the specified temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 5V, 0V, V
CM
= 2.5V unless otherwise noted.
CONDITIONS
Frequency = 100kHz, R
L
= 1kΩ
A
V
= –2, R
L
= 1kΩ
V
OUT
= 3V
P-P
, R
L
= 1kΩ
V
STEP
= 2V, A
V
= –1, R
L
= 1kΩ, 0.1%
l
l
l
MIN
35
18
1.9
TYP
50
35
3.7
535
MAX
UNITS
MHz
V/μs
MHz
ns
(LTC6244C/I, LTC6244HVC/I) The
l
denotes the specifications which apply over the specified temperature range, otherwise
specifications are at T
A
= 25°C. V
S
= 3V, 0V, V
CM
= 1.5V unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage (Note 4)
CONDITIONS
MS8 Package
0°C to 70°C
–40°C to 85°C
DD Package
0°C to 70°C
–40°C to 85°C
V
OS
Match Channel-to-Channel (Note 5) MS8 Package
0°C to 70°C
–40°C to 85°C
DD Package
0°C to 70°C
–40°C to 85°C
I
B
I
OS
Input Bias Current (Notes 4, 7)
Input Offset Current (Notes 4, 7)
Input Noise Voltage
e
n
i
n
V
CM
CMRR
Input Noise Voltage Density
Input Noise Current Density (Note 8)
Input Voltage Range
Common Mode Rejection
CMRR Match
Channel-to-Channel (Note 5)
A
VOL
Large Signal Voltage Gain
V
O
= 1V to 2V
R
L
= 10k to V
S
/2
0°C to 70°C
–40°C to 85°C
No Load
I
SINK
= 1mA
No Load
I
SOURCE
= 1mA
V
S
= 2.8V to 6V, V
CM
= 0.2V
Guaranteed by CMRR
0V ≤ V
CM
≤ 1.5V
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
TYP
40
MAX
175
250
325
650
800
950
200
300
350
800
900
1.1
75
UNITS
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
mV
pA
pA
pA
pA
μV
P-P
nV/√Hz
fA/√Hz
V
dB
dB
V/mV
V/mV
V/mV
100
40
150
1
0.5
75
1.5
8
0.56
0
70
68
200
100
85
105
100
800
1.5
12
0.1Hz to 10Hz
f = 1kHz
l
l
l
l
l
l
l
l
l
l
V
OL
V
OH
PSRR
Output Voltage Swing Low (Note 9)
Output Voltage Swing High (Note 9)
Power Supply Rejection
PSRR Match
Channel-to-Channel (Note 5)
Minimum Supply Voltage (Note 10)
12
45
12
50
75
73
2.8
8
15
105
100
30
110
30
110
mV
mV
mV
mV
dB
dB
V
mA
I
SC
Short-Circuit Current
6244fb
4
LTC6244
ELECTRICAL CHARACTERISTICS
SYMBOL
I
S
GBW
PARAMETER
Supply Current per Amplifier
Gain Bandwidth Product
Frequency = 100kHz, R
L
= 1kΩ
(LTC6244C/I, LTC6244HVC/I) The
l
denotes the specifications which apply
over the specified temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 3V, 0V, V
CM
= 1.5V unless otherwise noted.
CONDITIONS
l
l
MIN
35
TYP
4.8
50
MAX
5.8
UNITS
mA
MHz
(LTC6244HVC/I) The
l
denotes the specifications which apply over the specified temperature range, otherwise specifications are at
T
A
= 25°C. V
S
= ±5V, 0V, V
CM
= 0V unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage (Note 4)
CONDITIONS
MS8 Package
0°C to 70°C
–40°C to 85°C
DD Package
0°C to 70°C
–40°C to 85°C
V
OS
Match Channel-to-Channel (Note 5) MS8 Package
0°C to 70°C
–40°C to 85°C
DD Package
0°C to 70°C
–40°C to 85°C
TC V
OS
I
B
I
OS
Input Offset Voltage Drift, MS8 (Note 6)
Input Bias Current (Notes 4, 7)
Input Offset Current (Notes 4, 7)
Input Noise Voltage
e
n
i
n
R
IN
C
IN
Input Noise Voltage Density
Input Noise Current Density (Note 8)
Input Resistance
Input Capacitance
Differential Mode
Common Mode
Input Voltage Range
Common Mode Rejection
CMRR Match
Channel-to-Channel (Note 5)
A
VOL
Large Signal Voltage Gain
V
O
= –3.5V to 3.5V
R
L
= 10k
0°C to 70°C
–40°C to 85°C
R
L
= 1k
0°C to 70°C
–40°C to 85°C
V
OL
Output Voltage Swing Low (Note 9)
No Load
I
SINK
= 1mA
I
SINK
= 10mA
No Load
I
SOURCE
= 1mA
I
SOURCE
= 10mA
Common Mode
f = 100kHz
3.5
2.1
Guaranteed by CMRR
–5V ≤ V
CM
≤ 3.5V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
TYP
50
MAX
220
275
375
700
800
1050
250
325
400
900
1000
1100
2.5
75
UNITS
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV
μV/°C
pA
pA
pA
pA
μV
P-P
nV/√Hz
fA/√Hz
Ω
pF
pF
100
50
150
0.7
1
0.5
75
1.5
8
0.56
10
12
12
0.1Hz to 10Hz
f = 1kHz
V
CM
CMRR
–5
80
78
2500
1500
1200
700
400
300
105
95
6000
3.5
V
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
l
l
l
l
l
l
l
l
l
l
3500
15
45
360
15
45
360
40
75
550
40
75
550
mV
mV
mV
mV
mV
mV
6244fb
V
OH
Output Voltage Swing High (Note 9)
5
FPGA/CPLD
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