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LT6011/LT6012 Dual/Quad135A, 14nV/Hz, Rail-to-Rail Output Precision Op Amp
FEATURES
s s s s s s s s s s
DESCRIPTIO
60V Maximum Offset Voltage 300pA Maximum Input Bias Current 135A Supply Current per Amplifier Rail-to-Rail Output Swing 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)6011/LT6012 op amps combine 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 60V. The low drift and excellent long-term stability guarantee a high accuracy over temperature and time. The 300pA maximum input bias current and 120dB minimum voltage gain further maintain this precision over operating conditions. The LT6011/LT6012 work on any power supply voltage from 2.7V to 36V and draw only 135A of supply current on a 5V supply. The output swings to within 40mV of either supply rail, making the amplifier a good choice for low voltage single supply applications. The LT6011/LT6012 are specified at 5V and 15V supplies and from -40C to 85C. The LT6011 (dual) is available in SO-8 and space saving 3mm x 3mm DFN packages. The LT6012 (quad) is available in SO-14 and 16-pin SSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation. SoftSpan is a trademark of Linear Technology Corporation.
APPLICATIO S
s s s s s
Thermocouple Amplifiers Precision Photo Diode Amplifiers Instrumentation Amplifiers Battery-Powered Precision Systems Low Voltage Precision Systems
TYPICAL APPLICATIO
VS+ LT1236-5 5
Low Power Programmable Output Range 16-Bit SoftSpanTM DAC 20V Output Step Response
+
1/2 LT6011 6 7
-
C2 270pF
SUPPLY CURRENT 1.6mA TO 4mA DEPENDING ON CODE
5V/DIV 0V
2 R1 R1 5V 9 0.1F 14 13 12 11 10 CLR CS/LD SCK SDI SDO VCC
1 RCOM R2
16 15
3
4 C1 270pF VS+
R2 REF ROFS RFB
5V/DIV 0V
16-BIT DAC IOUT2 6 AGND LTC1592 GND 7 8 3
1/2 LT6011
6011 TA01
+
-
IOUT1
5
2
8 1 VOUT
4 VS-
U
100s/DIV
6011 TA03
U
U
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1
LT6011/LT6012
ABSOLUTE
AXI U
RATI GS (Note 1)
Maximum Junction Temperature DD Package ..................................................... 125C All Other Packages .......................................... 150C Storage Temperature Range DD Package ..................................... - 65C to 125C All Other Packages .......................... - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
Total Supply Voltage (V+ to V-) .............................. 40V Differential Input Voltage (Note 2) .......................... 10V Input 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 OUT A 1 -IN A 2 +IN A 3 V
-
ORDER PART NUMBER
8 V+ OUT B -IN B +IN B
A B
7 6 5
4
LT6011CDD LT6011IDD LT6011ACDD LT6011AIDD DD PART MARKING* LACD
DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN
TJMAX = 125C, JA = 160C/W UNDERSIDE METAL CONNECTED TO V- (PCB CONNECTION OPTIONAL)
TOP VIEW OUT A 1
- A +
14 OUT D D 13 -IN D 12 +IN D 11 V - B C
+ 10 +IN C - 9 -IN C - + + -
ORDER PART NUMBER LT6012CS LT6012IS LT6012ACS LT6012AIS
-IN A 2 +IN A 3 V+ 4 +IN B 5 -IN B 6 OUT B 7
+IN A 3 V+ 4
- A +
D
-IN B 6 OUT B 7 NC 8
8
OUT C
S PACKAGE 14-LEAD PLASTIC SO
TJMAX = 150C, JA = 110C/W
GN PACKAGE 16-LEAD PLASTIC SSOP TJMAX = 150C, JA = 135C/W
*Temperature and electrical grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
- +
+IN B 5
B
C-
+ -
U
U
W
WW
U
W
ORDER PART NUMBER
TOP VIEW OUT A 1 -IN A 2 A +IN A 3 V- B 4 5 6 -IN B +IN B 8 7 V+ OUT B
LT6011CS8 LT6011IS8 LT6011ACS8 LT6011AIS8 S8 PART MARKING 6011 6011I 6011A 6011AI ORDER PART NUMBER LT6012CGN LT6012IGN LT6012ACGN LT6012AIGN GN PART MARKING 6012 6012I 6012A 6012AI
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 190C/W
TOP VIEW OUT A 1 -IN A 2 16 OUT D 15 -IN D 14 +IN D 13 V -
+ 12 +IN C
11 -IN C 10 OUT C 9 NC
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LT6011/LT6012
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage (Note 8)
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; unless otherwise specified. (Note 5)
CONDITIONS LT6011AS8, LT6012AS TA = 0C to 70C TA = -40C to 85C LT6011ADD, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6012S TA = 0C to 70C TA = -40C to 85C LT6011DD, LT6012GN TA = 0C to 70C TA = -40C to 85C VOS/T IOS Input Offset Voltage Drift (Note 6) Input Offset Current (Note 8) LT6011AS8, LT6011S8, LT6012AS,LT6012S LT6011ADD, LT6011DD,LT6012AGN, LT6012GN LT6011AS8, LT6011ADD, LT6012AS, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6011DD, LT6012S, LT6012GN TA = 0C to 70C TA = -40C to 85C IB Input Bias Current (Note 8) LT6011AS8, LT6011ADD, LT6012AS, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6011DD, LT6012S, LT6012GN TA = 0C to 70C TA = -40C to 85C Input Noise Voltage en in RIN CIN VCM CMRR PSRR AVOL 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 Channel Separation 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 VOUT = 1V to 4V
q q q q q q q q q q
MIN
TYP 20
MAX 60 85 110 85 135 170 75 100 125 125 175 210 0.8 1.2 300 450 600 900 1200 1500 300 450 600 900 1200 1500
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 pA pA pA nVP-P nV/Hz pA/Hz G M pF V V dB V dB V/mV V/mV dB
25
q q
25
q q
30
q q q q
0.2 0.2 20
q q
150
q q
20
q q
150
q q
0.1Hz to 10Hz f = 1kHz f = 1kHz, Unbalanced Source Resistance Common Mode, VCM = 1V to 3.8V Differential 10
400 14 0.1 120 20 4 3.8 107 112 300 250 110 4 0.7 135 2.4 135 2000 2000 140 2.7 1
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LT6011/LT6012
ELECTRICAL CHARACTERISTICS
SYMBOL VOUT PARAMETER Maximum Output Swing (Positive, Referred to V +)
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; unless otherwise specified. (Note 5)
CONDITIONS No Load, 50mV Overdrive
q
MIN
TYP 35 120
MAX 55 65 170 220 55 65 225 275
UNITS mV mV mV mV mV mV mV mV mA mA mA mA V/s V/s V/s kHz kHz s s
ISOURCE = 1mA, 50mV Overdrive
q
Maximum Output Swing (Negative, Referred to 0V)
No Load, 50mV Overdrive
q
40 150
q
ISINK = 1mA, 50mV Overdrive ISC Output Short-Circuit Current (Note 3) VOUT = 0V, 1V Overdrive, Source
q
10 4 10 4 0.06 0.05 0.04 250 225
14 21 0.09
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 VOS
Gain Bandwidth Product Settling Time Rise Time, Fall Time Offset Voltage Match (Note 7)
330 45 1 50 120 170 220 170 270 340 150 200 250 250 350 420 600 900 1200 1800 2400 3000
AV = -1, 0.01%, VOUT = 1.5V to 3.5V AV = 1, 10% to 90%, 0.1V Step LT6011AS8, LT6012AS TA = 0C to 70C TA = -40C to 85C LT6011ADD, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6012S TA = 0C to 70C TA = -40C to 85C LT6011DD, LT6012GN TA = 0C to 70C TA = -40C to 85C
q q
V V V V V V V V V V V V pA pA pA pA pA pA dB dB
50
q q
50
q q
60
q q
IB
Input Bias Current Match (Note 7)
LT6011AS8, LT6011ADD, LT6012AS, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6011DD, LT6012S, LT6012GN TA = 0C to 70C TA = -40C to 85C
50
q q
q q q q
CMRR PSRR IS
Common Mode Rejection Ratio Match (Note 7) Power Supply Rejection Ratio Match (Note 7) Supply Current per Amplifier TA = 0C to 70C TA = -40C to 85C
101 106
135 135 135 150 190 210
q q
A A A
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LT6011/LT6012
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage (Note 8)
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, unless otherwise specified. (Note 5)
CONDITIONS LT6011AS8, LT6012AS TA = 0C to 70C TA = -40C to 85C LT6011ADD, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6012S TA = 0C to 70C TA = -40C to 85C LT6011DD, LT6012GN TA = 0C to 70C TA = -40C to 85C LT6011AS8, LT6011S8, LT6012AS, LT6012S LT6011ADD, LT6011DD, LT6012AGN, LT6012GN LT6011AS8, LT6011ADD, LT6012AS LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6011DD, LT6012S, LT6012GN TA = 0C to 70C TA = -40C to 85C LT6011AS8, LT6011ADD, LT6012AS, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6011DD, LT6012S, LT6012GN TA = 0C to 70C TA = -40C to 85C 0.1Hz to 10Hz f = 1kHz f = 1kHz, Unbalanced Source Resistance Common Mode, VCM = 13.5V Differential Guaranteed by CMRR VCM = -13.5V to 13.5V Guaranteed by PSRR VS = 1.35V to 18V RL = 10k, VOUT = -13.5V to 13.5V RL = 5k, VOUT = -13.5V to 13.5V
q
MIN
q q
TYP 30
35
q q
35
q q
40
q q q q q q
VOS/T IOS
Input Offset Voltage Drift (Note 6) Input Offset Current (Note 8)
0.2 0.2 20
150
q q
IB
Input Bias Current (Note 8)
20
q q
150
q q
MAX 135 160 185 160 210 225 150 175 200 200 250 275 0.8 1.3 300 450 600 900 1200 1500 300 450 600 900 1200 1500
en in RIN CIN VCM CMRR
Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Minimum Supply Voltage Power Supply Rejection Ratio Large-Signal Voltage Gain
50
13.5 115 q 112
q q q q
PSRR AVOL
VOUT
Channel Separation Maximum Output Swing (Positive, Referred to V +)
VOUT = -13.5V to 13.5V No Load, 50mV Overdrive ISOURCE = 1mA, 50mV Overdrive
q q
112 1000 600 500 300 120
400 13 0.1 400 20 4 14 135 135 1.2 135 2000 1500 140 45 140
1.35
q
Maximum Output Swing (Negative, Referred to V -)
No Load, 50mV Overdrive
q
45 150
q
ISINK = 1mA, 50mV Overdrive
80 100 195 240 80 100 250 300
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 pA pA pA nVP-P nV/Hz pA/Hz G M pF V dB dB V dB V/mV V/mV V/mV V/mV dB mV mV mV mV mV mV mV mV
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LT6011/LT6012
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 = 15V, VCM = 0V, RL to 0V, unless otherwise specified. (Note 5)
CONDITIONS VOUT = 0V, 1V Overdrive (Source)
q
VOUT = 0V, -1V Overdrive (Sink)
q
SR
Slew Rate
GBW ts tr, tf VOS
Gain Bandwidth Product Settling Time Rise Time, Fall Time Offset Voltage Match (Note 7)
AV = -10, RF = 50k, RG = 5k TA = 0C to 70C TA = -40C to 85C f = 10kHz AV = -1, 0.01%, VOUT = 0V to 10V AV = 1, 10% to 90%, 0.1V Step LT6011AS8, LT6012AS TA = 0C to 70C TA = -40C to 85C LT6011ADD, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6012S TA = 0C to 70C TA = -40C to 85C LT6011DD, LT6012GN TA = 0C to 70C TA = -40C to 85C LT6011AS8, LT6011ADD, LT6012AS, LT6012AGN TA = 0C to 70C TA = -40C to 85C LT6011S8, LT6011DD, LT6012S, LT6012GN TA = 0C to 70C TA = -40C to 85C
q q q
MIN 10 5 10 5 0.08 0.07 0.05 275 250
TYP 15 20 0.11
MAX
350 85 1 50
q q
50
q q
70
q q
80
q q
IB
Input Bias Current Match (Note 7)
50
q q q q q q
270 320 370 320 420 450 300 350 400 400 500 550 600 900 1200 1800 2400 3000
CMRR PSRR IS
Common Mode Rejection Ratio Match (Note 7) Power Supply Rejection Ratio Match (Note 7) Supply Current
109 106
135 135 260 330 380 400
UNITS mA mA mA mA V/s V/s V/s kHz kHz s s V V V V V V V V V V V V pA pA pA pA pA pA dB dB A A A
per Amplifier TA = 0C to 70C TA = -40C to 85C
q q
Note 1: Absolute Maximum Ratings are those beyond which the life if 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 LT6011C/LT6012C and LT6011I/LT6012I are guaranteed functional over the operating temperature range of - 40C to 85C. Note 5: The LT6011C/LT6012C are 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 LT6011I/LT6012I are guaranteed to meet specified performance from -40C to 85C.
Note 6: This parameter is not 100% tested. Note 7: Matching parameters are the difference between any two amplifiers. CMRR and PSRR are defined as follows: (1) CMRR and PSRR are measured in V/V for the individual amplifiers. (2) The difference between matching amplifiers is calculated in V/V. (3) The result is converted to dB. Note 8: The specifications for VOS, IB, and IOS depend on the grade and on the package. The following table clarifies the notations. STANDARD GRADE S8 Package DFN Package S14 Package GN16 Package LT6011S8 LT6011DD LT6012S LT6012GN A GRADE LT6011AS8 LT6011ADD LT6012AS LT6012AGN
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LT6011/LT6012 TYPICAL PERFOR A CE CHARACTERISTICS
Distribution of Input Offset Voltage
30 25 125 VS = 5V, 0V TA = 25C LT6011S8, LT6012S 100 75 VS = 5V, 0V REPRESENTATIVE UNITS
OFFSET VOLTAGE (V)
PERCENT OF UNITS (%)
OFFSET VOLTAGE (V)
20 15 10 5 0 -90 -70 -50 -30 -10 10 30 50 70 INPUT OFFSET VOLTAGE (V)
Distribution of Input Bias Current
25 VS = 5V, 0V TA = 25C LT6011A, LT6012A
INPUT BIAS CURRENT (pA)
INPUT BIAS CURRENT (pA)
20
PERCENT OF UNITS (%)
15
10
5
0 -400 -300 -200 -100 0 100 200 300 400 INPUT BIAS CURRENT (pA)
6011 G04
en, in vs Frequency
INPUT VOLTAGE NOISE DENSITY (nV/Hz) VS = 15V TA = 25C CURRENT NOISE UNBALANCED SOURCE RESISTORS 100 100 1000 INPUT CURRENT NOISE DENSITY (fA/Hz) 10
TOTAL INPUT NOISE (V/Hz)
0.1 TOTAL NOISE 0.01 RESISTOR NOISE ONLY
0.001
VOLTAGE NOISE 10 1 10 100 FREQUENCY (Hz) 1000
6011 G07
0.0001 100
1k
10k 100k 1M 10M SOURCE RESISTANCE ()
100M
NOISE VOLTAGE (0.2V/DIV)
UW
6011 G01
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 90 -125 -50 -25 50 25 0 75 TEMPERATURE (C) 100 125
-20 -15
5 0 10 -10 -5 INPUT COMMON MODE VOLTAGE (V)
15
6011 G02
6011 G03
Input Bias Current vs Temperature
1600 1400 1200 1000 800 600 400 200 0 -200 -50 -25 IB+ 0 25 75 50 TEMPERATURE (C) 100 125 IB- VS = 5V, 0V TYPICAL PART
Input Bias Current vs Input Common Mode Voltage
300 VS = 15V TYPICAL PART 13.9V TA = 85C TA = -40C
200
100
0 -14.2V -100
TA = 25C
-200 -15
10 -5 0 5 -10 COMMON MODE VOLTAGE (V)
15
1635 G06
6011 G05
Total Input Noise vs Source Resistance
VS = 5V, 0V TA = 25C f = 1kHz 1 UNBALANCED SOURCE RESISTORS
0.1Hz to 10Hz Noise
VS = 15V TA = 25C
0
1
2
3
456 TIME (SEC)
7
8
9
10
6011 G08
6011 G09
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LT6011/LT6012 TYPICAL PERFOR A CE CHARACTERISTICS
0.01Hz to 1Hz Noise
VS = 15V TA = 25C
OUTPUT VOLTAGE SWING (mV)
NOISE VOLTAGE (0.2V/DIV) V+ -20 -40 OUTPUT HIGH -60
OUTPUT HIGH SATURATION VOLTAGE (V)
0
10 20 30 40 50 60 70 80 90 100 TIME (SEC)
6011 G10
Output Saturation Voltage vs Load Current (Output Low)
1
OUTPUT LOW SATURATION VOLTAGE (V)
VS = 5V, 0V
400
CHANGE IN OFFSET VOLTAGE (V)
TA = 85C TA = 25C 0.1 TA = -40C
SUPPLY CURRENT (A)
0.01 0.01
0.1 1 LOAD CURRENT (mA)
THD + Noise vs Frequency
10 VS = 5V, 0V VOUT = 2VP-P TA = 25C AV = 1: RL = 10k AV = -1: RF = RG = 10k 10
1 THD + NOISE (%)
THD + NOISE (%)
OUTPUT STEP (V)
0.1
0.01 AV = -1 0.001 AV = 1
0.0001 10
100
1k 10k FREQUENCY (Hz)
8
UW
6011 G13
6011 G16
Output Voltage Swing vs Temperature
1
VS = 5V, 0V NO LOAD
Output Saturation Voltage vs Load Current (Output High)
VS = 5V, 0V
TA = 85C TA = 25C 0.1 TA = -40C
60 40 20 V- - 50 - 25 0
OUTPUT LOW
75 50 25 TEMPERATURE (C)
100
125
0.01 0.01
0.1 1 LOAD CURRENT (mA)
10
6011 G12
6011 G11
Supply Current vs Supply Voltage
500 450 PER AMPLIFIER
Warm-Up Drift
3
350 300 250 200 150 100 50 TA = 25C
TA = 85C
15V 2
TA = -40C
1
2.5V
10
0
0
0 2 4 6 8 10 12 14 16 18 20 SUPPLY VOLTAGE (V)
6011 G14
30 60 90 120 TIME AFTER POWER-ON (SECONDS)
150
6011 G15
THD + Noise vs Frequency
VS = 15V VIN = 20VP-P TA = 25C 10
Settling Time vs Output Step
VS = 15V AV = 1
1
8
0.1
6 0.1% 0.01% 4
0.01
AV = -1 AV = 1
0.001
2
100k
0.0001 10
0 100 1k FREQUENCY (Hz) 10k
6011 G17
0
10
20
30 40 50 60 70 SETTLING TIME (s)
80
90
6011 G18
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LT6011/LT6012 TYPICAL PERFOR A CE CHARACTERISTICS
Settling Time vs Output Step
10 VS = 15V AV = -1
140
CHANNEL SEPARATION (dB)
COMMON MODE REJECTION RATIO (dB)
8
OUTPUT STEP (V)
6 0.1% 0.01% 4
2
0 0 10 20 30 40 50 60 70 SETTLING TIME (s) 80 90
PSRR vs Frequency
140
POWER SUPPLY REJECTION RATIO (dB)
120 100 80
VS = 5V, 0V TA = 25C
OUTPUT IMPEDANCE ()
OPEN-LOOP GAIN (dB)
+PSRR 60 -PSRR 40 20 0 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M
Gain and Phase vs Frequency
60 50 40 OPEN-LOOP GAIN (dB) 30 20 10 0 GAIN PHASE -200 -160 VS = 5V, 0V TA = 25C RL = 10k -80 10 5 PHASE SHIFT (DEG) 0
GAIN (dB)
-5 -10 -15 -20 1k 10k 100k FREQUENCY (Hz) 1M
6011 G26
GAIN (dB)
-10 - 240
- 20 -30 - 40 1k 10k 100k 1M FREQUENCY (Hz)
UW
6011 G19 6011 G22 6011 G25
Channel Separation vs Frequency
160 VS = 5V, 0V TA = 25C
160 140 120 100 80 60 40 20 0
CMRR vs Frequency
TA = 25C
120 100 80 60 40 20 0 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M
VS = 15V VS = 5V, 0V
1
10
100 1k 10k FREQUENCY (Hz)
100k
1M
6011 G20
6011 G21
Output Impedance vs Frequency
1000 VS = 5V, 0V TA = 25C
Open-Loop Gain vs Frequency
140 120 100 80 60 40 20 0 VS = 5V, 0V TA = 25C RL = 10k
100
10 AV = 100 1 AV = 10 0.1 AV = 1 0.01 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M
-20 -40 0.01 0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
6011 G24
6011 G23
Gain vs Frequency, AV = 1
VS = 5V, 0V TA = 25C CL = 500pF CL = 50pF 10 5
Gain vs Frequency, AV = -1
VS = 5V, 0V TA = 25C CL = 500pF 0 CL = 50pF -5 -10 -15 -20 1k 10k 100k FREQUENCY (Hz) 1M
6011 G27
-120
-280 10M
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LT6011/LT6012 TYPICAL PERFOR A CE CHARACTERISTICS
Small-Signal Transient Response Large-Signal Transient Response Rail-to-Rail Output Swing
5V
20mV/DIV
AV = 1
2s/DIV
APPLICATIO S I FOR ATIO
Preserving Input Precision
Preserving the input accuracy of the LT6011/LT6012 requires that the applications circuit and PC board layout do not introduce errors comparable to or greater than the 25V typical offset of the amplifiers. 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 LT6011/LT6012 low input bias currents are obtained by a cancellation circuit on-chip. This causes the resulting I B + and I B - to be uncorrelated, as implied by the IOS specification being comparable to IB. 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 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 with a guard ring driven to the same potential as the input common mode to avoid excessive leakage in high impedance applications. Input Protection The LT6011/LT6012 feature on-chip back-to-back diodes between the input devices, along with 500 resistors in
10
U
W
UW
2V/DIV
0V
1V/DIV
0V
6011 G28
AV = -1 VS = 15V
50s/DIV
6011 G29
AV = -1 VS = 5V, 0V
100s/DIV
6011 G30
UU
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 LT6011/LT6012 output is able to swing close 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 LT6011/LT6012 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:
vn(TOTAL) = en2 + 4kTRS + (in RS )2
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LT6011/LT6012
APPLICATIO S I FOR ATIO
where en = 14nV/Hz , in = 0.1pA/Hz and RS is the total impedance at the input, including the source impedance. Capacitive Loads The LT6011/LT6012 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.
VREF RG
+ -
RF
VIN
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
Figure 1. Some Op Amp Configurations Do Not Require Rail-to-Rail Inputs to Achieve Rail-to-Rail Outputs
SI PLIFIED SCHE ATIC
V
+
(One Amplifier)
R3 Q7
R4
Q8 Q5 Q3 Q4 Q21 B A Q22 C2
R1 500 -IN D1 +IN R2 500 Q1 Q2 D2
Q17 C B A Q11 Q15 Q9 Q10
V-
U
Rail-to-Rail Operation The LT6011/LT6012 outputs can swing to within millivolts of either supply rail, but the inputs can not. However, for most op amp configurations, the inputs need to swing less than the outputs. Figure 1 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.
+ -
RF
6011 F01
W
W
UU
VIN
VIN
+ -
RG VREF NONINVERTING: AV = 1 + RF/RG INPUTS MOVE BY AS MUCH AS VIN, BUT THE OUTPUT MOVES MORE INPUT MAY NOT HAVE TO BE RAIL-TO-RAIL NONINVERTING: AV = 1 INPUTS MOVE BY AS MUCH AS OUTPUT INPUT MUST BE RAIL-TO-RAIL FOR OVERALL CIRCUIT RAIL-TO-RAIL PERFORMANCE
W
R5
R6
Q6 RC1 C1
Q18
Q19
Q13 D3 D4 Q12 D5 Q14 C3 Q20 OUT
Q16
6011 SS
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11
LT6011/LT6012
PACKAGE DESCRIPTIO U
DD Package 8-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115 TYP 5 0.675 0.05 0.38 0.10 8 3.00 0.10 (4 SIDES) PIN 1 PACKAGE TOP MARK OUTLINE
(DD8) DFN 0203
3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES)
1.65 0.10 (2 SIDES)
0.28 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.200 REF
0.75 0.05
4 0.28 0.05 2.38 0.10 (2 SIDES)
1 0.50 BSC
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. 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
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12
LT6011/LT6012
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)
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13
LT6011/LT6012
PACKAGE DESCRIPTIO U
S14 Package 14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.045 .005 .050 BSC N 14 13 .337 - .344 (8.560 - 8.738) NOTE 3 12 11 10 9 8 N .160 .005 .228 - .244 (5.791 - 6.197) 1 .030 .005 TYP 2 3 N/2 N/2 .150 - .157 (3.810 - 3.988) NOTE 3 1 .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0 - 8 TYP 2 3 4 5 6 7 .053 - .069 (1.346 - 1.752) .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
S14 0502
.245 MIN
RECOMMENDED SOLDER PAD LAYOUT
.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)
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14
LT6011/LT6012
PACKAGE DESCRIPTIO U
GN Package 16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.045 .005 .189 - .196* (4.801 - 4.978) 16 15 14 13 12 11 10 9 .009 (0.229) REF .150 - .165 .229 - .244 (5.817 - 6.198) .0165 .0015 .150 - .157** (3.810 - 3.988) .0250 TYP 1 .015 .004 x 45 (0.38 0.10) .007 - .0098 (0.178 - 0.249) .016 - .050 (0.406 - 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0 - 8 TYP .053 - .068 (1.351 - 1.727) 23 4 56 7 8 .004 - .0098 (0.102 - 0.249) .008 - .012 (0.203 - 0.305) .0250 (0.635) BSC
GN16 (SSOP) 0502
.254 MIN
RECOMMENDED SOLDER PAD LAYOUT
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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
LT6011/LT6012
TYPICAL APPLICATIO U
Low Power Hall Sensor Amplifier
VS HALL ELEMENT ASAHI-KASEI HW-108A (RANK D) www.asahi-kasei.co.jp 6 10k OFFSET VS ADJUST 1 2 3
+ -
8 1
VS 4 LT1790-1.25 1, 2
1/2 LT6011 2
49.9k 400 x4 3 4 6 26.7k 1% 1k VOUT
7.87k 1%
49.9k
+
100k 1% VS = 3V TO 18V IS = ~600A VOUT = ~40mV/mT LT1782
-
-
1/2 LT6011 7
5
+
4
6011 TA02
RELATED PARTS
PART NUMBER LT1112/LT1114 LT1880 LT1881/LT1882 LT1884/LT1885 DESCRIPTION Dual/Quad Low Power, Picoamp Input Precision Op Amp Rail-to-Rail Output, Picoamp Input Precision Op Amp Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amp Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amp COMMENTS 250pA Input Bias Current SOT-23 CLOAD Up to 1000pF 9.5nV/Hz Input Noise
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16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
LT/TP 0903 1K REV A * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003

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