LT6010
135µA, 14nV/√Hz,
Rail-to-Rail Output Precision
Op Amp with Shutdown
U
FEATURES
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DESCRIPTIO
35µV Maximum Offset Voltage
110pA Maximum Input Bias Current
135µA Supply Current
Rail-to-Rail Output Swing
12µA Supply Current in Shutdown
120dB Minimum Voltage Gain (VS = ±15V)
0.8µV/°C Maximum VOS Drift
14nV/√Hz Input Noise Voltage
2.7V to ±18V Supply Voltage Operation
Operating Temperature Range: – 40°C to 85°C
Space Saving 3mm × 3mm DFN Package
U
APPLICATIO S
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Thermocouple Amplifiers
Precision Photo Diode Amplifiers
Instrumentation Amplifiers
Battery-Powered Precision Systems
The LT®6010 op amp combines low noise and high precision input performance with low power consumption and
rail-to-rail output swing.
Input offset voltage is trimmed to less than 35µV. The low
drift and excellent long-term stability guarantee a high
accuracy over temperature and over time. The 110pA
maximum input bias current and 120dB minimum voltage
gain further maintain this precision over operating
conditions.
The LT6010 works on any power supply voltage from 2.7V
to 36V, and draws only 135µA of supply current on a 5V
supply. A power saving shutdown feature reduces supply
current to 12µA. The output voltage swings to within
40mV of either supply rail, making the amplifier a good
choice for low voltage single supply operation.
The LT6010 is fully specified at 5V and ±15V supplies and
from –40°C to 85°C. The device is available in SO-8 and
space-saving 3mm × 3mm DFN packages. This op amp
is also available in dual (LT6011) and quad (LT6012)
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Single Supply Current Source for Platinum RTD
Distribution of Offset Voltage Drift
R5
1k, 5%
20
VS = ±2.5V
SO-8 PACKAGES
+
VOUT = 100mV AT 0°C + 385µV/°C
– –50°C TO 600°C
1k
AT 0°C
RTD*
R4
1k, 5%
R1
12.4k
0.1%
C1
0.1µF
2
3
VS
–
+
7
6
LT6010
R2
100Ω
1%
VS = 2.7V TO 20V
ICC ≈ 320µA
4
PERCENTAGE OF UNITS (%)
18
16
14
12
10
8
6
4
2
6
1µF
LT1790-1.25
1
2
4
VS
0
–0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6
DISTRIBUTION (µV/°C)
0.8
6010 TA01b
*OMEGA F3141 1kΩ, 0.1% PLATINUM RTD
(800) 826-6342
6010 TA01a
sn6010 6010fs
1
LT6010
W W
W
AXI U
U
ABSOLUTE
RATI GS (Note 1)
Total Supply Voltage (V+ to V–) .............................. 40V
Differential Input Voltage (Note 2) .......................... 10V
Input Voltage, Shutdown Voltage ..................... V+ to V–
Input Current (Note 2) ....................................... ±10mA
Output Short-Circuit Duration (Note 3) ........... Indefinite
Operating Temperature Range (Note 4) .. – 40°C to 85°C
Specified Temperature Range (Note 5) ... – 40°C to 85°C
Maximum Junction Temperature
DD Package ..................................................... 125°C
SO-8 Package .................................................. 150°C
Storage Temperature Range
DD Package ..................................... – 65°C to 125°C
SO-8 Package .................................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U
U
W
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
NULL 1
–IN 2
+IN 3
V
–
4
–
+
8
NULL
7
V+
6
OUT
5
SHDN
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
LT6010CDD
LT6010IDD
LT6010ACDD
LT6010AIDD
DD PART MARKING*
TJMAX = 125°C, θJA = 160°C/W
UNDERSIDE METAL INTERNALLY CONNECTED TO V–
(PCB CONNECTION OPTIONAL)
ORDER PART
NUMBER
TOP VIEW
NULL 1
–IN 2
+IN 3
V– 4
LADU
–
+
8
NULL
7
V+
6
OUT
5
SHDN
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 190°C/W
LT6010CS8
LT6010IS8
LT6010ACS8
LT6010AIS8
S8 PART MARKING
6010
6010I
6010A
6010AI
*Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, 0V; VCM = 2.5V; RL to 0V; SHDN = 0.2V, unless otherwise
specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage (Note 7)
LT6010AS8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010S8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010ADD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010DD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010AS8, LT6010S8
LT6010ADD,LT6010DD
●
●
∆VOS/∆T
Input Offset Voltage Drift (Note 6)
MIN
TYP
MAX
UNITS
10
35
60
75
µV
µV
µV
20
55
85
110
µV
µV
µV
20
60
85
100
µV
µV
µV
30
80
110
135
µV
µV
µV
0.2
0.2
0.8
1.3
µV/°C
µV/°C
sn6010 6010fs
2
LT6010
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, 0V; VCM = 2.5V; RL to 0V; SHDN = 0.2V, unless otherwise
specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
IOS
Input Offset Current (Note 7)
LT6010AS8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010S8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010ADD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010DD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010AS8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010S8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010ADD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010DD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
IB
Input Bias Current (Note 7)
MIN
Input Noise Voltage
0.1Hz to 10Hz
en
Input Noise Voltage Density
in
Input Noise Current Density
RIN
Input Resistance
Common Mode, VCM = 1V to 3.8V
Differential
CIN
Input Capacitance
V CM
Input Voltage Range (Positive)
Input Voltage Range (Negative)
Guaranteed by CMRR
Guaranteed by CMRR
●
●
3.8
107
CMRR
TYP
MAX
UNITS
20
110
150
200
pA
pA
pA
40
200
300
400
pA
pA
pA
20
200
300
400
pA
pA
pA
40
300
400
500
pA
pA
pA
20
±110
±150
±200
pA
pA
pA
40
±200
±300
±400
pA
pA
pA
20
±200
±300
±400
pA
pA
pA
40
±300
±400
±500
pA
pA
pA
400
nVP-P
f = 1kHz
14
nV/√Hz
f = 1kHz
0.1
pA/√Hz
120
20
GΩ
MΩ
4
pF
10
4
0.7
1
135
V
V
Common Mode Rejection Ratio
VCM = 1V to 3.8V
●
Minimum Supply Voltage
Guaranteed by PSRR
●
PSRR
Power Supply Rejection Ratio
VS = 2.7V to 36V, VCM = 1/2VS
●
112
135
dB
A VOL
Large-Signal Voltage Gain
RL = 10k, VOUT = 1V to 4V
RL = 2k, VOUT = 1V to 4V
●
●
300
250
2000
2000
V/mV
V/mV
VOUT
Maximum Output Swing
(Positive, Referred to V +)
No Load, 50mV Overdrive
2.4
55
65
mV
mV
120
170
220
mV
mV
40
55
65
mV
mV
150
225
275
mV
mV
●
Maximum Output Swing
(Negative, Referred to 0V)
No Load, 50mV Overdrive
●
ISINK = 1mA, 50mV Overdrive
●
V
35
●
ISOURCE = 1mA, 50mV Overdrive
dB
2.7
sn6010 6010fs
3
LT6010
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, 0V; VCM = 2.5V; RL to 0V; SHDN = 0.2V, unless otherwise
specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
ISC
Output Short-Circuit Current (Note 3)
VOUT = 0V, 1V Overdrive (Source)
MIN
TYP
14
●
10
4
mA
mA
10
4
21
●
mA
mA
0.06
0.05
0.04
0.09
●
●
V/µs
V/µs
V/µs
250
225
330
●
kHz
kHz
VOUT = 5V, –1V Overdrive (Sink)
SR
GBW
Slew Rate
Gain Bandwidth Product
AV = –10, RF = 50k, RG = 5k
TA = 0°C to 70°C
TA = –40°C to 85°C
f = 10kHz
MAX
UNITS
ts
Settling Time
AV = –1, 0.01%, VOUT = 1.5V to 3.5V
45
µs
tr, tf
Rise Time, Fall Time
AV = 1, 10% to 90%, 0.1V Step
1
µs
SHDN Pin Current
SHDN ≤ V –
ISHDN
+ 0.2V (On)
●
SHDN = V – + 2.0V (Off)
●
tSHDN
SHDN Turn-On, Turn-Off Time
SHDN = V – (On) to V – + 2.0V (Off)
SHDN = V – + 2.0V (Off) to V – (On)
IS
Supply Current
SHDN ≤ V – + 0.2V (On)
TA = 0°C to 70°C
TA = –40°C to 85°C
15
0.25
µA
25
µA
µs
µs
25
25
135
150
190
210
µA
µA
µA
12
25
50
µA
µA
●
●
SHDN = V– + 2.0V (Off)
●
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VS = ±15V, VCM = 0V, RL to 0V; SHDN = –14.8V, unless otherwise specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage (Note 7)
LT6010AS8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010S8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010ADD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010DD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
∆VOS/∆T
Input Offset Voltage Drift (Note 6)
LT6010AS8, LT6010S8
LT6010ADD,LT6010DD
●
●
IOS
Input Offset Current (Note 7)
LT6010AS8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010S8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010ADD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
TYP
MAX
UNITS
10
60
80
110
µV
µV
µV
20
85
120
160
µV
µV
µV
20
85
105
135
µV
µV
µV
30
110
145
185
µV
µV
µV
0.2
0.2
0.8
1.3
µV/°C
µV/°C
20
110
150
200
pA
pA
pA
40
200
300
400
pA
pA
pA
20
200
300
400
pA
pA
pA
sn6010 6010fs
4
LT6010
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, RL to 0V; SHDN = –14.8V, unless otherwise
specified. (Note 5)
SYMBOL
PARAMETER
IOS
Input Offset Current (Note 7)
IB
Input Bias Current (Note 7)
CONDITIONS
MIN
LT6010DD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010AS8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010S8
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010ADD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
LT6010DD
TA = 0°C to 70°C
TA = –40°C to 85°C
●
●
TYP
MAX
UNITS
40
300
400
500
pA
pA
pA
20
±110
±150
±200
pA
pA
pA
40
±200
±300
±400
pA
pA
pA
20
±200
±300
±400
pA
pA
pA
40
±300
±400
±500
pA
pA
pA
Input Noise Voltage
0.1Hz to 10Hz
400
nVP-P
en
Input Noise Voltage Density
f = 1kHz
13
nV/√Hz
in
Input Noise Current Density
f = 1kHz
RIN
Input Resistance
Common Mode, VCM = ±13.5V
Differential
CIN
Input Capacitance
VCM
Input Voltage Range
Guaranteed by CMRR
CMRR
Common Mode Rejection Ratio
VCM = –13.5V to 13.5V
0.1
pA/√Hz
50
400
20
GΩ
MΩ
4
pF
●
±13.5
±14
V
115
112
135
●
dB
dB
±1.2
±1.35
Minimum Supply Voltage
Guaranteed by PSRR
●
PSRR
Power Supply Rejection Ratio
VS = ±1.35V to ±18V
●
112
135
dB
AVOL
Large-Signal Voltage Gain
RL = 10k, VOUT = –13.5V to 13.5V
1000
600
2000
●
V/mV
V/mV
500
300
1500
●
V/mV
V/mV
RL = 5k, VOUT = –13.5V to 13.5V
VOUT
Maximum Output Swing
(Positive, Referred to V +)
No Load, 50mV Overdrive
45
80
100
mV
mV
140
195
240
mV
mV
45
80
100
mV
mV
150
250
300
mV
mV
●
ISOURCE = 1mA, 50mV Overdrive
●
Maximum Output Swing
(Negative, Referred to 0V)
No Load, 50mV Overdrive
●
ISINK = 1mA, 50mV Overdrive
●
ISC
Output Short-Circuit Current (Note 3)
VOUT = 0V, 1V Overdrive (Source)
V
10
5
15
●
mA
mA
10
5
20
●
mA
mA
VOUT = 0V, –1V Overdrive (Sink)
sn6010 6010fs
5
LT6010
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, RL to 0V; SHDN = –14.8V, unless otherwise
specified. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
SR
Slew Rate
AV = –10, RF = 50k, RG = 5k
TA = 0°C to 70°C
TA = –40°C to 85°C
GBW
Gain Bandwidth Product
MIN
TYP
0.08
0.07
0.05
0.11
●
●
V/µs
V/µs
V/µs
275
250
350
●
kHz
kHz
f = 10kHz
MAX
UNITS
ts
Settling Time
AV = –1, 0.01%, VOUT = 0V to 10V
85
µs
tr, tf
Rise Time, Fall Time
AV = 1, 10% to 90%, 0.1V Step
1
µs
SHDN Pin Current
SHDN ≤ V– + 0.2V (On)
●
SHDN = V– + 2.0V (Off)
●
ISHDN
tSHDN
SHDN Turn-On, Turn-Off Time
SHDN = V – (On) to V – + 2.0V (Off)
SHDN = V – + 2.0V (Off) to V – (On)
IS
Supply Current
SHDN ≤ V– + 0.2V (On)
TA = 0°C to 70°C
TA = –40°C to 85°C
µA
25
µA
µs
µs
25
25
260
330
380
400
µA
µA
µA
18
50
µA
●
●
SHDN = V– + 2.0V (Off)
Note 1: Absolute Maximum Ratings are those beyond which the life of the
device may be impaired.
Note 2: The inputs are protected by back–to–back diodes and internal
series resistors. If the differential input voltage exceeds 10V, the input
current must be limited to less than 10mA.
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum ratings.
Note 4: Both the LT6010C and LT6010I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 5: The LT6010C is guaranteed to meet the specified performance
0.25
15
from 0°C to 70°C and 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. The LT6010I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 6: This parameter is not 100% tested.
Note 7: The specifications for VOS, IB and IOS depend on the grade and on
the package. The following table clarifies the notations used in the
specification table:
Standard Grade
A Grade
S8 Package
LT6010S8
LT6010AS8
DFN Package
LT6010DD
LT6010ADD
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Offset Voltage
vs Temperature
Distribution of Input Offset Voltage
100
120
VS = 5V, 0V
REPRESENTATIVE UNITS
100
75
20
15
10
OFFSET VOLTAGE (µV)
PERCENT OF UNITS (%)
25
125
LT6010AS8
VS = 5V, 0V
TA = 25°C
OFFSET VOLTAGE (µV)
30
Offset Voltage
vs Input Common Mode Voltage
50
25
0
–25
–50
VS = ±15V
TYPICAL PART
80
TA = 85°C
60
TA = –40°C
40
20
TA = 25°C
–75
5
0
–100
0
–45 –35 –25 –15 –5
5
15
25
35
45
INPUT OFFSET VOLTAGE (µV)
6010 G01
–125
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
6010 G02
–20
–15
5
0
10
–10
–5
INPUT COMMON MODE VOLTAGE (V)
15
6010 G03
sn6010 6010fs
6
LT6010
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current
vs Input Common Mode Voltage
Input Bias Current vs Temperature
VS = 5V, 0V
TYPICAL PART
INPUT BIAS CURRENT (pA)
800
TA = –40°C
700
20pA/DIV
600
500
400
TA = 25°C
TA = 85°C
300
200
100
IB +
–100
–50
IB–
0
25
50
75
TEMPERATURE (°C)
–25
100
125
2V/DIV
0.01Hz to 1Hz Noise
VS = ±15V
TA = 25°C
VS = ±15V
TA = 25°C
0.01
RESISTOR NOISE ONLY
0.001
10k 100k
1M
10M
SOURCE RESISTANCE (Ω)
NOISE VOLTAGE (0.2µV/DIV)
TOTAL NOISE
1k
100M
1
0
2
3
4 5 6
TIME (SEC)
7
8
6010 G07
1
VS = 5V, 0V
NO LOAD
–20
–40
OUTPUT HIGH
–60
60
OUTPUT LOW
40
20
75
50
25
TEMPERATURE (°C)
0
10
0
100
125
6010 G10
10 20 30 40 50 60 70 80 90 100
TIME (SEC)
6010 G09
Output Saturation Voltage
vs Load Current (Output High)
OUTPUT HIGH SATURATION VOLTAGE (V)
OUTPUT VOLTAGE SWING (mV)
V+
9
6010 G08
Output Voltage Swing
vs Temperature
V–
– 50 – 25
6010 G06
0.1Hz to 10Hz Noise
0.1
1000
6010 G05
VS = 5V, 0V
TA = 25°C
f = 1kHz
0.0001
100
10
100
FREQUENCY (Hz)
1
NOISE VOLTAGE (0.2µV/DIV)
TOTAL INPUT NOISE (µV/√Hz)
1
VOLTAGE NOISE
15
6010 G04
10
100
10
–100
–15
Total Input Noise
vs Source Resistance
1000
CURRENT NOISE
100
Output Saturation Voltage
vs Load Current (Output Low)
1
VS = 5V, 0V
OUTPUT LOW SATURATION VOLTAGE (V)
0
VS = ±15V
TA = 25°C
INPUT CURRENT NOISE DENSITY (fA/√Hz)
900
en, in vs Frequency
100
INPUT VOLTAGE NOISE DENSITY (nV/√Hz)
1000
TA = 85°C
TA = 25°C
0.1
TA = –40°C
0.01
0.01
0.1
1
LOAD CURRENT (mA)
10
6010 G11
VS = 5V, 0V
TA = 85°C
TA = 25°C
0.1
TA = –40°C
0.01
0.01
0.1
1
LOAD CURRENT (mA)
10
6010 G12
sn6010 6010fs
7
LT6010
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Warm-Up Drift
Supply Current vs Supply Voltage
400
350
TA = 85°C
300
TA = 25°C
250
200
TA = –40°C
150
100
10
VS = 5V, 0V
VOUT = 2VP-P
TA = 25°C
AV = 1: RL = 10k
AV = –1: RF = RG = 10k
1
±15V
2
THD + NOISE (%)
CHANGE IN OFFSET VOLTAGE (µV)
450
SUPPLY CURRENT (µA)
THD + Noise vs Frequency
3
500
±2.5V
1
0.1
0.01
AV = –1
AV = 1
0.001
50
0
0
0
2
4
30
60
90
120
TIME AFTER POWER-ON (SECONDS)
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (±V)
THD + Noise vs Frequency
VS = ±15V
VIN = 20VP-P
TA = 25°C
0.01
AV = 1
6
0.1%
0.01%
4
10k
20
30 40 50 60 70
SETTLING TIME (µs)
0.01%
4
80
90
0
20
30 40 50 60 70
SETTLING TIME (µs)
80
90
PSRR vs Frequency
TA = 25°C
140
120
100
VS = ±15V
80
10
6010 G18
140
POWER SUPPLY REJECTION RATIO (dB)
COMMON MODE REJECTION RATIO (dB)
0.1%
6010 G17
CMRR vs Frequency
VS = 5V, 0V
60
6
0
10
0
6010 G16
160
VS = ±15V
AV = –1
2
0
100
1k
FREQUENCY (Hz)
100k
8
2
0.001
0.0001
10
VS = ±15V
AV = 1
OUTPUT STEP (V)
AV = –1
1k
10k
FREQUENCY (Hz)
Settling Time vs Output Step
10
8
0.1
100
6010 G15
Settling Time vs Output Step
10
OUTPUT STEP (V)
THD + NOISE (%)
1
0.0001
10
6010 G14
6010 G13
10
150
40
20
VS = 5V, 0V
TA = 25°C
120
100
80
+PSRR
60
–PSRR
40
20
0
0
1
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
6010 G20
0.1
1
10 100 1k 10k 100k
FREQUENCY (Hz)
1M
6010 G21
sn6010 6010fs
8
LT6010
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Impedance vs Frequency
1000
Open-Loop Gain vs Frequency
140
VS = 5V, 0V
TA = 25°C
10
AV = 100
1
AV = 10
80
60
40
20
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
–40
0.01 0.1
10
1
1k
10k
GAIN (dB)
–10
40
VS = 5V, 0V
TA = 25°C
CL = 50pF
–5
–10
–15
–15
–20
–20
1k
1M
10k
100k
FREQUENCY (Hz)
6010 G25
35
30
25
VS = ±15V
20
15
10
VS = 5V, 0V
5
0
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
1M
6010 G26
Small-Signal Transient Response
–280
10M
Supply Current in Shutdown Mode
vs Temperature
0
–5
100k
1M
FREQUENCY (Hz)
6010 G24
CL = 500pF
0
GAIN (dB)
– 240
– 40
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
5
CL = 500pF
10k
100k
FREQUENCY (Hz)
–200
Gain vs Frequency, AV = –1
VS = 5V, 0V
TA = 25°C
1k
0
6010 G23
Gain vs Frequency, AV = 1
CL = 50pF
–160
PHASE
10
–30
6010 G22
5
GAIN
20
SUPPLY CURRENT IN SHUTDOWN (µA)
1
–120
30
– 20
–20
AV = 1
–80
–10
0
0.1
10
40
OPEN-LOOP GAIN (dB)
OPEN-LOOP GAIN (dB)
100
VS = 5V, 0V
TA = 25°C
RL = 10k
50
PHASE SHIFT (DEG)
OUTPUT IMPEDANCE (Ω)
VS = 5V, 0V
TA = 25°C
RL = 10k
120
100
Gain and Phase vs Frequency
60
6010 G30
Large-Signal Transient Response
Rail-to-Rail Output Swing
5V
20mV/DIV
0V
2V/DIV
1V/DIV
0V
AV = 1
2µs/DIV
6011 G27
AV = –1
VS = ±15V
50µs/DIV
6011 G28
AV = –1
VS = 5V, 0V
100µs/DIV
6011 G29
sn6010 6010fs
9
LT6010
U
W
U U
APPLICATIO S I FOR ATIO
Preserving Input Precision
Preserving the input accuracy of the LT6010 requires that
the applications circuit and PC board layout do not introduce errors comparable to or greater than the 20µV typical
offset of the amplifier. Temperature differentials across
the input connections can generate thermocouple voltages of 10’s of microvolts, so the connections to the input
leads should be short, close together, and away from heat
dissipating components. Air currents across the board
can also generate temperature differentials.
The extremely low input bias currents (20pA typical) allow
high accuracy to be maintained with high impedance
sources and feedback resistors. The LT6010 low input
bias currents are obtained by a cancellation circuit onchip. The input bias currents are permanently trimmed at
wafer testing to a low level. Do not try to balance the input
resistances in each input lead; instead, keep the resistance
at either input as low as possible for maximum accuracy.
Leakage currents on the PC board can be higher than the
LT6010’s input bias current. For example, 10GΩ of leakage between a 15V supply lead and an input lead will generate 1.5nA! Surround the input leads by a guard ring, driven
to the same potential as the input common mode, to avoid
excessive leakage in high impedance applications.
Input Protection
The LT6010 features on-chip back-to-back diodes between the input devices, along with 500Ω resistors in
series with either input. This internal protection limits the
input current to approximately 10mA (the maximum
allowed) for a 10V differential input voltage. Use additional
external series resistors to limit the input current to 10mA
in applications where differential inputs of more than 10V
are expected. For example, a 1k resistor in series with each
input provides protection against 30V differential voltage.
Input Common Mode Range
The LT6010 output is able to swing nearly to each power
supply rail (rail-to-rail out), but the input stage is limited to
operating between V– + 1V and V+ – 1.2V. Exceeding this
common mode range will cause the gain to drop to zero,
however no phase reversal will occur.
Total Input Noise
The LT6010 amplifier contributes negligible noise to the
system when driven by sensors (sources) with impedance
between 20kΩ and 1MΩ. Throughout this range, total
input noise is dominated by the 4kTRS noise of the source.
If the source impedance is less than 20kΩ, the input
voltage noise of the amplifier starts to contribute with a
minimum noise of 14nV/√Hz for very low source impedance. If the source impedance is more than 1MΩ, the input
current noise of the amplifier, multiplied by this high
impedance, starts to contribute and eventually dominate.
Total input noise spectral density can be calculated as:
vn(TOTAL) = en2 + 4kTRS + (in RS )2
where en = 14nV/√Hz, in = 0.1pA/√Hz and RS the total
impedance at the input, including the source impedance.
sn6010 6010fs
10
LT6010
U
W
U U
APPLICATIO S I FOR ATIO
Offset Voltage Adjustment
The input offset voltage of the LT6010 and its drift with
temperature are permanently trimmed at wafer testing to
the low level as specified in the electrical characteristic.
However, if further adjustment of VOS is desired, nulling with
a 50k potentiometer is possible and will not degrade drift
with temperature. Trimming to a value other than zero
creates a drift of (VOS/300µV) µV/°C, e.g., if VOS is adjusted
to 300µV, the change in drift will be 1µV/°C. The adjustment
range with a 50k pot is approximately ±0.9mV (see Figures
1A and 1B). The sensitivity and resolution of the nulling can
be improved by using a smaller pot in conjunction with fixed
resistors. The configuration shown has an approximate
nulling range of ±150µV (see Figures 2A and 2B).
Standard Adjustment
VCC
50k
1
2
–
INPUT
8
7
LT6010
3
+
6
OUTPUT
CHANGE IN OFFSET VOLTAGE (mV)
1.0
4
6010 F01a
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
Vee
0
0.2
0.4
0.6
0.8
POTENTIOMETER POSITION
1.0
6010 F01b
Figure 1A
Figure 1B
Improved Sensitivity Adjustment
10k
VCC
50k
1
2
–
10k
8
7
LT6010
INPUT
3
+
6
OUTPUT
CHANGE IN OFFSET VOLTAGE (µV)
200
150
100
50
0
–50
–100
–150
4
6010 F02a
Vee
–200
0
0.2
0.4
0.6
0.8
POTENTIOMETER POSITION
1.0
6010 F02b
Figure 2A
Figure 2B
sn6010 6010fs
11
LT6010
U
W
U U
APPLICATIO S I FOR ATIO
Shutdown
Rail-to-Rail Operation
The LT6010 can be put into shutdown mode to conserve
power. When the SHDN pin is biased at less than 0.2V
above the negative supply, the part operates normally.
When pulled 2V or more above V–, the supply current
drops to about 12µA, shutting down the op amp.
The LT6010 outputs can swing to within millivolts of either
supply rail, but the inputs cannot. However, for most op
amp configurations, the inputs need to swing less than the
outputs. Figure 4 shows the basic op amp configurations,
lists what happens to the op amp inputs and specifies
whether or not the op amp must have rail-to-rail inputs.
Select a rail-to-rail input op amp only when really necessary, because the input precision specifications are usually inferior.
The output of the LT6010 op amp is not isolated from the
inputs while in shutdown mode. Therefore, this shutdown
feature cannot be used for multiplexing applications.
There is an internal 85k resistor at the SHDN pin. If the
SHDN voltage source is more than 2V above the negative
supply, an external series resistor can be placed between
the source and SHDN pin to reduce SHDN pin current (see
Figure 3). For an example of suggested values see Table 1.
The resistors listed ensure that the voltage at the SHDN pin
is 2V above the negative supply.
VIN
RSHDN (kΩ)
2
NONE
3
77k
4
153k
5
230k
RG
–
RF
INVERTING: AV = –RF/RG
OP AMP INPUTS DO NOT MOVE,
BUT ARE FIXED AT DC BIAS
POINT VREF
Table 1
VSHDN (V)
+
VREF
INPUT DOES NOT HAVE TO BE
RAIL-TO-RAIL
+
VIN
VIN
–
+
–
RF
RSHDN
+
–
SHDN
5
85k
RG
VREF
VSHDN
VEE
VEE
6010 F03
Figure 3
Capacitive Loads
The LT6010 can drive capacitive loads up to 500pF in unity
gain. The capacitive load driving capability increases as
the amplifier is used in higher gain configurations. A small
series resistance between the output and the load further
increases the amount of capacitance that the amplifier can
drive.
NONINVERTING: AV = 1 + RF/RG
INPUTS MOVE AS MUCH AS
VIN, BUT THE OUTPUT MOVES
MORE
INPUT MAY NOT HAVE TO BE
RAIL-TO-RAIL
6010 F04
NONINVERTING: AV = 1
INPUTS MOVE AS MUCH AS THE
OUTPUT
INPUT MUST BE RAIL-TO-RAIL
FOR OVERALL CIRCUIT
RAIL-TO-RAIL PERFORMANCE
Figure 4. Some Op Amp Configurations Do Not Require
Rail-to-Rail Inputs to Achieve Rail-to-Rail Outputs
sn6010 6010fs
12
LT6010
W
W
SI PLIFIED SCHE ATIC
V+
7
NULL
1
R3
8
R4
NULL
R6
R5
Q7
Q18
Q6
Q8
RC1
Q5
Q4
Q3
BIAS CURRENT
GENERATOR
2
+IN
3
D1
R2
500Ω
SHDN
5
V–
4
D3
Q17
Q12
Q1
Q2
D5
Q14
Q10
C
B
A
D2
6 OUT
D4
Q16
R1
500Ω
–IN
Q13
C2
Q21
B
A
Q19
C1
C3
Q20
Q11
Q15
Q9
Q10
6010 SS
sn6010 6010fs
13
LT6010
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
0.675 ±0.05
3.5 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.28 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
5
3.00 ±0.10
(4 SIDES)
0.38 ± 0.10
8
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(DD8) DFN 0203
0.200 REF
0.75 ±0.05
0.00 – 0.05
4
0.28 ± 0.05
1
0.50 BSC
2.38 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. 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
4. EXPOSED PAD SHALL BE SOLDER PLATED
sn6010 6010fs
14
LT6010
U
PACKAGE DESCRIPTIO
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)
3
4
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
2
.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)
.050
(1.270)
BSC
SO8 0303
sn6010 6010fs
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
LT6010
U
TYPICAL APPLICATIO
Precision JFET Input Transimpedance Photodiode Amplifier
C4
0.5pF
C3
1pF
V+
R3
100k, 1%
J1
+
–
U1
LT6010
R1
330k, 5%
R4
2.55k
–
R2
1k
5%
C2
0.1µF
S1
C1
0.01µF
V–
V–
U2
LT6230
VOUT
+
J1: PHILIPS BF862
S1: SIEMENS/INFINEON SFH203 PHOTODIODE (~3pF)
VSUPPLY = ±5V
ISUPPLY = 5.6mA
BANDWIDTH = 6MHz
AZ = 100kΩ
OUTPUT OFFSET ≈ 50µV TYPICALLY
6010 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT6011/6012
Dual/Quad Precision Op Amps
135µA, Rail-to-Rail Output
LT1001
Low Power, Picoamp Input Precision Op Amp
250pA Input Bias Current
LT1880
Rail-to-Rail Output, Picoamp Input Precision Op Amp
CLOAD up to 1000pF
sn6010 6010fs
16
Linear Technology Corporation
LT/TP 1203 1K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
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