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LT6010 135A, 14nV/Hz, Rail-to-Rail Output Precision Op Amp with Shutdown
FEATURES
s s s s s s s s s s s
DESCRIPTIO
35V Maximum Offset Voltage 110pA Maximum Input Bias Current 135A Supply Current Rail-to-Rail Output Swing 12A Supply Current in Shutdown 120dB Minimum Voltage Gain (VS = 15V) 0.8V/C Maximum VOS Drift 14nV/Hz Input Noise Voltage 2.7V to 18V Supply Voltage Operation Operating Temperature Range: - 40C to 85C Space Saving 3mm x 3mm DFN Package
The LT(R)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 35V. 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 135A of supply current on a 5V supply. A power saving shutdown feature reduces supply current to 12A. 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 -40C to 85C. The device is available in SO-8 and space-saving 3mm x 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.
APPLICATIO S
s s s s
Thermocouple Amplifiers Precision Photo Diode Amplifiers Instrumentation Amplifiers Battery-Powered Precision Systems
TYPICAL APPLICATIO
R5 1k, 5%
Single Supply Current Source for Platinum RTD
20 18
VOUT = 100mV AT 0C + 385V/C - -50C TO 600C C1 0.1F
Distribution of Offset Voltage Drift
VS = 2.5V SO-8 PACKAGES
PERCENTAGE OF UNITS (%)
+
1k AT 0C RTD* R4 1k, 5% R1 12.4k 0.1% R2 100 1% VS = 2.7V TO 20V ICC 320A *OMEGA F3141 1k, 0.1% PLATINUM RTD
16 14 12 10 8 6 4 2
VS 7 LT6010 6
+
3
-
2
4
6 1F
LT1790-1.25 1 2
4
VS
0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 DISTRIBUTION (V/C) 0.8
(800) 826-6342
6010 TA01a
U
6010 TA01b
U
U
sn6010 6010fs
1
LT6010
ABSOLUTE
AXI U
RATI GS (Note 1)
Maximum Junction Temperature DD Package ..................................................... 125C SO-8 Package .................................................. 150C Storage Temperature Range DD Package ..................................... - 65C to 125C SO-8 Package .................................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
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) .. - 40C to 85C Specified Temperature Range (Note 5) ... - 40C to 85C
PACKAGE/ORDER I FOR ATIO
TOP VIEW NULL 1 -IN 2 +IN 3 V
-
ORDER PART NUMBER
8 NULL V+ OUT SHDN 7 6 5
- +
4
DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN
TJMAX = 125C, JA = 160C/W UNDERSIDE METAL INTERNALLY CONNECTED TO V- (PCB CONNECTION OPTIONAL)
LT6010CDD LT6010IDD LT6010ACDD LT6010AIDD DD PART MARKING* LADU
*Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage (Note 7)
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, 0V; VCM = 2.5V; RL to 0V; SHDN = 0.2V, unless otherwise specified. (Note 5)
CONDITIONS LT6010AS8 TA = 0C to 70C TA = -40C to 85C LT6010S8 TA = 0C to 70C TA = -40C to 85C LT6010ADD TA = 0C to 70C TA = -40C to 85C LT6010DD TA = 0C to 70C TA = -40C to 85C
q q
VOS/T
Input Offset Voltage Drift (Note 6)
LT6010AS8, LT6010S8 LT6010ADD,LT6010DD
2
U
U
W
WW
U
W
TOP VIEW NULL 1 -IN 2 +IN 3 V- 4 - + 8 7 6 5 NULL V+ OUT SHDN
ORDER PART NUMBER LT6010CS8 LT6010IS8 LT6010ACS8 LT6010AIS8 S8 PART MARKING 6010 6010I 6010A 6010AI
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 190C/W
MIN
TYP 10
MAX 35 60 75 55 85 110 60 85 100 80 110 135 0.8 1.3
UNITS V V V V V V V V V V V V V/C V/C
sn6010 6010fs
20
q q
20
q q
30
q q q q
0.2 0.2
LT6010
ELECTRICAL CHARACTERISTICS
SYMBOL IOS PARAMETER Input Offset Current (Note 7)
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, 0V; VCM = 2.5V; RL to 0V; SHDN = 0.2V, unless otherwise specified. (Note 5)
CONDITIONS LT6010AS8 TA = 0C to 70C TA = -40C to 85C LT6010S8 TA = 0C to 70C TA = -40C to 85C LT6010ADD TA = 0C to 70C TA = -40C to 85C LT6010DD TA = 0C to 70C TA = -40C to 85C IB Input Bias Current (Note 7) LT6010AS8 TA = 0C to 70C TA = -40C to 85C LT6010S8 TA = 0C to 70C TA = -40C to 85C LT6010ADD TA = 0C to 70C TA = -40C to 85C LT6010DD TA = 0C to 70C TA = -40C to 85C Input Noise Voltage en in RIN CIN V CM CMRR PSRR A VOL VOUT Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range (Positive) Input Voltage Range (Negative) Common Mode Rejection Ratio Minimum Supply Voltage Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Swing (Positive, Referred to V +) Guaranteed by CMRR Guaranteed by CMRR VCM = 1V to 3.8V Guaranteed by PSRR VS = 2.7V to 36V, VCM = 1/2VS RL = 10k, VOUT = 1V to 4V RL = 2k, VOUT = 1V to 4V No Load, 50mV Overdrive
q q q q q q q q q q
MIN
TYP 20
MAX 110 150 200 200 300 400 200 300 400 300 400 500 110 150 200 200 300 400 200 300 400 300 400 500
UNITS pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA nVP-P nV/Hz pA/Hz G M pF V V dB V dB V/mV V/mV
40
q q
20
q q
40
q q
20
q q
40
q q
20
q q
40
q q
0.1Hz to 10Hz f = 1kHz f = 1kHz Common Mode, VCM = 1V to 3.8V Differential 10
400 14 0.1 120 20 4 3.8 107 112 300 250 4 0.7 135 2.4 135 2000 2000 35 120
q
1 2.7
55 65 170 220 55 65 225 275
mV mV mV mV mV mV mV mV
sn6010 6010fs
ISOURCE = 1mA, 50mV Overdrive Maximum Output Swing (Negative, Referred to 0V) No Load, 50mV Overdrive
q
40 150
q
ISINK = 1mA, 50mV Overdrive
3
LT6010
ELECTRICAL CHARACTERISTICS
SYMBOL ISC PARAMETER Output Short-Circuit Current (Note 3)
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, 0V; VCM = 2.5V; RL to 0V; SHDN = 0.2V, unless otherwise specified. (Note 5)
CONDITIONS VOUT = 0V, 1V Overdrive (Source)
q
MIN 10 4 10 4 0.06 0.05 0.04 250 225
TYP 14 21 0.09
MAX
UNITS mA mA mA mA V/s V/s V/s kHz kHz s s
VOUT = 5V, -1V Overdrive (Sink)
q
SR
Slew Rate
AV = -10, RF = 50k, RG = 5k TA = 0C to 70C TA = -40C to 85C f = 10kHz
q q q
GBW ts tr, tf ISHDN tSHDN IS
Gain Bandwidth Product Settling Time Rise Time, Fall Time SHDN Pin Current SHDN Turn-On, Turn-Off Time Supply Current
330 45 1
AV = -1, 0.01%, VOUT = 1.5V to 3.5V AV = 1, 10% to 90%, 0.1V Step SHDN V - + 0.2V (On)
q q
0.25 15 25 25 135 25
A A s s
SHDN = V - + 2.0V (Off) SHDN = V - (On) to V - + 2.0V (Off) SHDN = V - + 2.0V (Off) to V - (On) SHDN V - + 0.2V (On) TA = 0C to 70C TA = -40C to 85C SHDN = V- + 2.0V (Off)
q q
150 190 210 25 50
A A A A A
12
q
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, RL to 0V; SHDN = -14.8V, unless otherwise specified. (Note 5)
SYMBOL VOS PARAMETER Input Offset Voltage (Note 7) CONDITIONS LT6010AS8 TA = 0C to 70C TA = -40C to 85C LT6010S8 TA = 0C to 70C TA = -40C to 85C LT6010ADD TA = 0C to 70C TA = -40C to 85C LT6010DD TA = 0C to 70C TA = -40C to 85C VOS/T IOS Input Offset Voltage Drift (Note 6) Input Offset Current (Note 7) LT6010AS8, LT6010S8 LT6010ADD,LT6010DD LT6010AS8 TA = 0C to 70C TA = -40C to 85C LT6010S8 TA = 0C to 70C TA = -40C to 85C LT6010ADD TA = 0C to 70C TA = -40C to 85C
q q
MIN
TYP 10
MAX 60 80 110 85 120 160 85 105 135 110 145 185 0.8 1.3 110 150 200 200 300 400 200 300 400
UNITS V V V V V V V V V V V V V/C V/C pA pA pA pA pA pA pA pA pA
sn6010 6010fs
20
q q
20
q q
30
q q q q q q
0.2 0.2 20
40
q q
20
q q
4
LT6010
ELECTRICAL CHARACTERISTICS
SYMBOL IOS PARAMETER Input Offset Current (Note 7)
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, RL to 0V; SHDN = -14.8V, unless otherwise specified. (Note 5)
CONDITIONS LT6010DD TA = 0C to 70C TA = -40C to 85C LT6010AS8 TA = 0C to 70C TA = -40C to 85C LT6010S8 TA = 0C to 70C TA = -40C to 85C LT6010ADD TA = 0C to 70C TA = -40C to 85C LT6010DD TA = 0C to 70C TA = -40C to 85C Input Noise Voltage 0.1Hz to 10Hz f = 1kHz f = 1kHz Common Mode, VCM = 13.5V Differential Guaranteed by CMRR VCM = -13.5V to 13.5V
q q q q
MIN
TYP 40
MAX 300 400 500 110 150 200 200 300 400 200 300 400 300 400 500
UNITS pA pA pA pA pA pA pA pA pA pA pA pA pA pA pA nVP-P nV/Hz pA/Hz G M pF V dB dB
IB
Input Bias Current (Note 7)
20
q q
40
q q
20
q q
40
q q
400 13 0.1 50 400 20 4 13.5 115 112 112 1000 600 500 300 14 135 1.2 135 2000 1500 45
q
en in RIN CIN VCM CMRR
Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Minimum Supply Voltage
Guaranteed by PSRR VS = 1.35V to 18V RL = 10k, VOUT = -13.5V to 13.5V
q q q
1.35
V dB V/mV V/mV V/mV V/mV
PSRR AVOL
Power Supply Rejection Ratio Large-Signal Voltage Gain
RL = 5k, VOUT = -13.5V to 13.5V
q
VOUT
Maximum Output Swing (Positive, Referred to V +)
No Load, 50mV Overdrive ISOURCE = 1mA, 50mV Overdrive
q
80 100 195 240 80 100 250 300
mV mV mV mV mV mV mV mV mA mA mA mA
140 45
q
Maximum Output Swing (Negative, Referred to 0V)
No Load, 50mV Overdrive ISINK = 1mA, 50mV Overdrive
q
150 10 5 10 5 15 20
ISC
Output Short-Circuit Current (Note 3)
VOUT = 0V, 1V Overdrive (Source)
q
VOUT = 0V, -1V Overdrive (Sink)
q
sn6010 6010fs
5
LT6010
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, RL to 0V; SHDN = -14.8V, unless otherwise specified. (Note 5)
SYMBOL SR PARAMETER Slew Rate CONDITIONS AV = -10, RF = 50k, RG = 5k TA = 0C to 70C TA = -40C to 85C f = 10kHz
q q q
ELECTRICAL CHARACTERISTICS
MIN 0.08 0.07 0.05 275 250
TYP 0.11
MAX
UNITS V/s V/s V/s kHz kHz s s
GBW ts tr, tf ISHDN tSHDN IS
Gain Bandwidth Product Settling Time Rise Time, Fall Time SHDN Pin Current SHDN Turn-On, Turn-Off Time Supply Current
350 85 1
AV = -1, 0.01%, VOUT = 0V to 10V AV = 1, 10% to 90%, 0.1V Step SHDN V- + 0.2V (On) SHDN = V- + 2.0V (Off) SHDN = V - (On) to V - + 2.0V (Off) SHDN = V - + 2.0V (Off) to V - (On) SHDN V- + 0.2V (On) TA = 0C to 70C TA = -40C to 85C SHDN = V- + 2.0V (Off)
q q q q
0.25 15 25 25 260 330 380 400 50 25
A A s s A A A A
18
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 -40C to 85C. Note 5: The LT6010C is guaranteed to meet the specified performance
from 0C to 70C and is designed, characterized and expected to meet specified performance from -40C to 85C but is not tested or QA sampled at these temperatures. The LT6010I is guaranteed to meet specified performance from -40C to 85C. 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 S8 Package DFN Package LT6010S8 LT6010DD A Grade LT6010AS8 LT6010ADD
TYPICAL PERFOR A CE CHARACTERISTICS
Distribution of Input Offset Voltage
30 25 125 VS = 5V, 0V TA = 25C LT6010AS8 100 75 VS = 5V, 0V REPRESENTATIVE UNITS
OFFSET VOLTAGE (V)
PERCENT OF UNITS (%)
OFFSET VOLTAGE (V)
20 15 10 5 0 -45 -35 -25 -15 -5
5
15
INPUT OFFSET VOLTAGE (V)
6010 G01
6
UW
25 35
Input Offset Voltage vs Temperature
120 100 80
Offset Voltage vs Input Common Mode Voltage
VS = 15V TYPICAL PART
50 25 0 -25 -50 -75
TA = 85C 60 TA = -40C 40 20 0 TA = 25C
-100 45 -125 -50 -25 50 25 0 75 TEMPERATURE (C) 100 125
-20 -15
5 0 10 -10 -5 INPUT COMMON MODE VOLTAGE (V)
15
6010 G02
6010 G03
sn6010 6010fs
LT6010 TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current vs Temperature
1000 900 800 VS = 5V, 0V TYPICAL PART 100
INPUT VOLTAGE NOISE DENSITY (nV/Hz)
INPUT BIAS CURRENT (pA)
700
20pA/DIV
600 500 400 300 200 100 0 -100 -50 -25 IB + IB- 0 25 50 75 TEMPERATURE (C) 100 125
Total Input Noise vs Source Resistance
10 VS = 5V, 0V TA = 25C f = 1kHz
TOTAL INPUT NOISE (V/Hz)
NOISE VOLTAGE (0.2V/DIV)
0.1 TOTAL NOISE 0.01 RESISTOR NOISE ONLY 0.001
0.0001 100
1k
10k 100k 1M 10M SOURCE RESISTANCE ()
100M
0
1
2
3
456 TIME (SEC)
7
8
9
10
NOISE VOLTAGE (0.2V/DIV)
1
Output Voltage Swing vs Temperature
V+ 1 OUTPUT HIGH SATURATION VOLTAGE (V) VS = 5V, 0V NO LOAD -20 -40 OUTPUT HIGH -60
TA = 85C TA = 25C 0.1 TA = -40C
OUTPUT LOW SATURATION VOLTAGE (V)
OUTPUT VOLTAGE SWING (mV)
60 40 20 V- - 50 - 25 0
OUTPUT LOW
75 50 25 TEMPERATURE (C)
UW
6010 G04
Input Bias Current vs Input Common Mode Voltage
en, in vs Frequency
VS = 15V TA = 25C 1000 INPUT CURRENT NOISE DENSITY (fA/Hz)
TA = -40C
CURRENT NOISE 100 100
TA = 85C
TA = 25C
VOLTAGE NOISE 10
-100 -15
2V/DIV
15
6010 G05
1
10 100 FREQUENCY (Hz)
1000
6010 G06
0.1Hz to 10Hz Noise
VS = 15V TA = 25C
0.01Hz to 1Hz Noise
VS = 15V TA = 25C
0
10 20 30 40 50 60 70 80 90 100 TIME (SEC)
6010 G09
6010 G07
6010 G08
Output Saturation Voltage vs Load Current (Output High)
VS = 5V, 0V 1
Output Saturation Voltage vs Load Current (Output Low)
VS = 5V, 0V
TA = 85C TA = 25C 0.1 TA = -40C
100
125
0.01 0.01
0.1 1 LOAD CURRENT (mA)
10
6010 G11
0.01 0.01
0.1 1 LOAD CURRENT (mA)
10
6010 G12
6010 G10
sn6010 6010fs
7
LT6010 TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
500
CHANGE IN OFFSET VOLTAGE (V) 3
450 400
SUPPLY CURRENT (A)
THD + NOISE (%)
350 300 250 200 150 100 50 0 TA = 25C
TA = 85C
TA = -40C
0
2
4
6 8 10 12 14 16 18 20 SUPPLY VOLTAGE (V)
6010 G13
THD + Noise vs Frequency
10 VS = 15V VIN = 20VP-P TA = 25C 10
1
OUTPUT STEP (V)
THD + NOISE (%)
0.1
6 0.1% 0.01% 4
OUTPUT STEP (V)
0.01
AV = -1 AV = 1
0.001
0.0001 10
100 1k FREQUENCY (Hz)
CMRR vs Frequency
160
COMMON MODE REJECTION RATIO (dB)
140 120 100 80 60 40 20 0 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M VS = 5V, 0V VS = 15V
POWER SUPPLY REJECTION RATIO (dB)
TA = 25C
8
UW
6010 G16
Warm-Up Drift
10
THD + Noise vs Frequency
VS = 5V, 0V VOUT = 2VP-P TA = 25C AV = 1: RL = 10k AV = -1: RF = RG = 10k
1
15V 2
0.1
1
2.5V
0.01 AV = -1 0.001 AV = 1
0 30 60 90 120 TIME AFTER POWER-ON (SECONDS) 150
0.0001 10
100
1k 10k FREQUENCY (Hz)
100k
6010 G15
6010 G14
Settling Time vs Output Step
VS = 15V AV = 1 10
Settling Time vs Output Step
VS = 15V AV = -1
8
8
6 0.1% 0.01% 4
2
2
0 10k 0 10 20 30 40 50 60 70 SETTLING TIME (s) 80 90
0 0 10 20 30 40 50 60 70 SETTLING TIME (s) 80 90
6010 G17
6010 G18
PSRR vs Frequency
140 120 100 80 +PSRR 60 -PSRR 40 20 0 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M VS = 5V, 0V TA = 25C
6010 G20
6010 G21
sn6010 6010fs
LT6010 TYPICAL PERFOR A CE CHARACTERISTICS
Output Impedance vs Frequency
1000 VS = 5V, 0V TA = 25C
OPEN-LOOP GAIN (dB)
140 120 100 80 60 40 20 0
100 OUTPUT IMPEDANCE ()
OPEN-LOOP GAIN (dB)
10 AV = 100 1 AV = 10 0.1 AV = 1 0.01 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M
Gain vs Frequency, AV = 1
10 5 0 VS = 5V, 0V TA = 25C CL = 500pF CL = 50pF -5 -10 -15 -20 1k 10k 100k FREQUENCY (Hz) 1M
6010 G25
SUPPLY CURRENT IN SHUTDOWN (A)
GAIN (dB)
GAIN (dB)
Small-Signal Transient Response
20mV/DIV
AV = 1
2s/DIV
UW
6010 G22
Open-Loop Gain vs Frequency
VS = 5V, 0V TA = 25C RL = 10k
Gain and Phase vs Frequency
60 50 40 30 20 10 0 GAIN PHASE -200 -160 VS = 5V, 0V TA = 25C RL = 10k -80
-120 PHASE SHIFT (DEG)
-10 - 240
- 20 -30
1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
6010 G23
-20 -40 0.01 0.1
- 40 1k 10k 100k 1M FREQUENCY (Hz)
-280 10M
6010 G24
Gain vs Frequency, AV = -1
10 5 CL = 500pF 0 CL = 50pF -5 -10 -15 -20 1k 10k 100k FREQUENCY (Hz) 1M
6010 G26
Supply Current in Shutdown Mode vs Temperature
40 35 30 25 20 15 10 5 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 TEMPERATURE (C)
6010 G30
VS = 5V, 0V TA = 25C
VS = 15V
VS = 5V, 0V
Large-Signal Transient Response
Rail-to-Rail Output Swing
5V
2V/DIV
0V
1V/DIV
0V
6011 G27
AV = -1 VS = 15V
50s/DIV
6011 G28
AV = -1 VS = 5V, 0V
100s/DIV
6011 G29
sn6010 6010fs
9
LT6010
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 20V 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, 10G 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 500 resistors in series with either input. This internal protection limits the input current to approximately 10mA (the maximum
10
U
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 20k and 1M. Throughout this range, total input noise is dominated by the 4kTRS noise of the source. If the source impedance is less than 20k, 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 1M, 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:
W
UU
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
LT6010
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
CHANGE IN OFFSET VOLTAGE (mV)
50k
VCC
1 2 INPUT 3
- +
8 7 LT6010 4
6010 F01a
6
OUTPUT
Vee
Figure 1A Improved Sensitivity Adjustment
200
10k 50k 10k 8 7 LT6010 3 6
6010 F02a
CHANGE IN OFFSET VOLTAGE (V)
VCC
1 2 INPUT
- +
OUTPUT
4
Vee
Figure 2A
U
creates a drift of (VOS/300V) V/C, e.g., if VOS is adjusted to 300V, the change in drift will be 1V/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 150V (see Figures 2A and 2B).
Standard Adjustment
1.0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 0.2 0.4 0.6 0.8 POTENTIOMETER POSITION 1.0
6010 F01b
W
UU
Figure 1B
150 100 50 0 -50 -100 -150 -200 0 0.2 0.4 0.6 0.8 POTENTIOMETER POSITION 1.0
6010 F02b
Figure 2B
sn6010 6010fs
11
LT6010
APPLICATIO S I FOR ATIO
Shutdown
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 12A, shutting down the op amp. 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.
Table 1
VSHDN (V) 2 3 4 5 RSHDN (k) NONE 77k 153k 230k
RSHDN
+ -
VSHDN VEE
SHDN 5
85k
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.
12
U
Rail-to-Rail Operation 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.
+
RG VREF VIN
W
UU
-
RF
INVERTING: AV = -RF/RG OP AMP INPUTS DO NOT MOVE, BUT ARE FIXED AT DC BIAS POINT VREF INPUT DOES NOT HAVE TO BE RAIL-TO-RAIL
VIN
+ -
RF RG VREF 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
VIN
+ -
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
LT6010
SI PLIFIED SCHE ATIC W W
V-
V+ NULL
7 1 Q7 Q6 Q8 Q5 Q3 Q4 Q21 B A Q17 C2 D3 D4 Q12 D5 Q14 C3 Q20 RC1 C1 Q18 Q19 R3 R4 8 NULL R5 R6
Q13 6 OUT
BIAS CURRENT GENERATOR R1 500 -IN +IN 2 D1 3 R2 500 SHDN 5 Q1 Q2 D2
Q16 Q10 C B A Q11 Q15 Q9 Q10
4
6010 SS
sn6010 6010fs
13
LT6010
PACKAGE DESCRIPTIO
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 0.38 0.10 8
PIN 1 TOP MARK
(DD8) DFN 0203
0.200 REF
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
14
U
DD Package 8-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1698)
0.675 0.05 3.00 0.10 (4 SIDES) 1.65 0.10 (2 SIDES) 0.75 0.05 4 0.28 0.05 2.38 0.10 (2 SIDES) BOTTOM VIEW--EXPOSED PAD 1 0.50 BSC 0.00 - 0.05
sn6010 6010fs
LT6010
PACKAGE DESCRIPTIO U
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 - .197 (4.801 - 5.004) NOTE 3 8 7 6 5 .045 .005 .050 BSC .160 .005 .228 - .244 (5.791 - 6.197) .150 - .157 (3.810 - 3.988) NOTE 3 1 2 3 4 .053 - .069 (1.346 - 1.752) 0- 8 TYP .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
SO8 0303
.245 MIN
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254)
.016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN
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)
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
TYPICAL APPLICATIO U
C4 0.5pF V+ C3 1pF R3 100k, 1% J1
Precision JFET Input Transimpedance Photodiode Amplifier
+
U1 LT6010 R1 330k, 5% R4 2.55k R2 1k 5% C2 0.1F V-
-
U2 LT6230 VOUT
-
+
S1
C1 0.01F
V-
J1: PHILIPS BF862 S1: SIEMENS/INFINEON SFH203 PHOTODIODE (~3pF) VSUPPLY = 5V ISUPPLY = 5.6mA BANDWIDTH = 6MHz AZ = 100k OUTPUT OFFSET 50V TYPICALLY
6010 TA02
RELATED PARTS
PART NUMBER LT6011/6012 LT1001 LT1880 DESCRIPTION Dual/Quad Precision Op Amps Low Power, Picoamp Input Precision Op Amp Rail-to-Rail Output, Picoamp Input Precision Op Amp COMMENTS 135A, Rail-to-Rail Output 250pA Input Bias Current CLOAD up to 1000pF
sn6010 6010fs
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
LT/TP 1203 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003

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