Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Op-amp Multi-purpose MSOP 8

LTC6081/LTC6082

60812fd

For more information www.linear.com/LTC6081

Typical applicaTion

FeaTures

applicaTions

DescripTion

Precision Dual/Quad

CMOS Rail-to-Rail Input/

Output Ampliﬁers

The LTC

6081/LTC6082 are dual/quad low offset, low drift,

low noise CMOS operational ampliﬁers with rail-to-rail

input/output swing.

The 70µV maximum offset, 1pA input bias current, 120dB

open loop gain and 1.3µV

P-P

0.1Hz to 10Hz noise make

it perfect for precision signal conditioning. The LTC6081/

LTC6082 features 100dB CMRR and 98dB PSRR.

Each ampliﬁer consumes only 330µA of current on a 3V

supply. The 10-lead DFN has an independent shutdown

function that reduces each ampliﬁer’s supply current

to 1µA.

LTC6081/LTC6082 is speciﬁed for power supply voltages

of 3V and 5V from –40°C to 125°C. The dual LTC6081 is

available in 8-lead MSOP and 10-lead DFN10 packages.

The quad LTC6082 is available in 16-lead SSOP and DFN

packages.

Shock Sensor Ampliﬁer (Accelerometer)

■

Maximum Offset Voltage: 70µV (25°C)

■

Maximum Offset Drift: 0.8µV/°C

■

Maximum Input Bias: 1pA (25°C) 40pA (T

≤ 85°C)

■

Open Loop Voltage Gain: 120dB Typ

■

Gain Bandwidth Product: 3.6MHz

■

CMRR: 100dB Min

■

PSRR: 98dB Min

■

0.1Hz to 10Hz Noise: 1.3µV

P-P

■

Supply Current: 330µA

■

Rail-to-Rail Inputs and Outputs

■

Unity Gain Stable

■

2.7V to 5.5V Operation Voltage

■

Dual LTC6081 in 8-Lead MSOP and 10-Lead DFN10

Packages; Quad LTC6082 in 16-Lead SSOP and DFN

Packages

■

Photodiode Ampliﬁer

■

Strain Gauge

■

High Impedance Sensor Ampliﬁer

■

Microvolt Accuracy Threshold Detection

■

Instrumentation Ampliﬁers

■

Thermocouple Ampliﬁers

60812 TA01

–

10k

3.9pF

47pF

0.1µF

1/2

LTC6081

0.1µF

8.2pF

3.9pF

OUT

= 109mV/g

BW ~ 2.2kHz

MURATA

PKGS-00LD

770pF

0° SENSOR

Drift Histogram

OSDRIFT

(µV/°C)

NUMBER OF AMPLIFIERS (OUT OF 100)

60812 TA01b

LTC6081MS8

= –40°C TO 125°C

= 3V

= 0.5V

0.20 0.30–0.10–0.20 0 0.10

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.

Summary of content (20 pages)

PAGE 1
LTC6081/LTC6082 Precision Dual/Quad CMOS Rail-to-Rail Input/ Output Amplifiers Description Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Maximum Offset Voltage: 70µV (25°C) Maximum Offset Drift: 0.8µV/°C Maximum Input Bias: 1pA (25°C) 40pA (TA ≤ 85°C) Open Loop Voltage Gain: 120dB Typ Gain Bandwidth Product: 3.6MHz CMRR: 100dB Min PSRR: 98dB Min 0.1Hz to 10Hz Noise: 1.3µVP-P Supply Current: 330µA Rail-to-Rail Inputs and Outputs Unity Gain Stable 2.7V to 5.
PAGE 2
LTC6081/LTC6082 Absolute Maximum Ratings (Note 1) Total Supply Voltage (V+ to V–)....................................6V Input Voltage....................................................... V– to V+ Output Short Circuit Duration (Note 2)............. Indefinite Operating Temperature Range (Note 3) LTC6081C, LTC6082C........................... –40°C to 85°C LTC6081I, LTC6082I.............................. –40°C to 85°C LTC6081H, LTC6082H.........................
PAGE 3
LTC6081/LTC6082 order information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6081CDD#PBF LTC6081CDD#TRPBF LCJP 10-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C LTC6081IDD#PBF LTC6081IDD#TRPBF LCJP 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C LTC6081CMS8#PBF LTC6081CMS8#TRPBF LTCJN 8-Lead Plastic MSOP 0°C to 70°C LTC6081IMS8#PBF LTC6081IMS8#TRPBF LTCJN 8-Lead Plastic MSOP –40°C to 85°C LTC6081HMS8#PBF LTC6081HMS8#TRPBF LTCJN 8-Lead P
PAGE 4
LTC6081/LTC6082 Electrical Characteristics The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 3V, V– = 0V, VCM = 0.5V unless otherwise noted. C, I SUFFIXES SYMBOL PARAMETER VOS Offset Voltage CONDITIONS MIN LTC6081MS8, LTC6082GN LTC6081MS8, LTC6082GN LTC6081DD, LTC6082DHC LTC6081DD, LTC6082DHC VCM = 0.5V, 2.5V VCM = 0.5V, 2.5V VCM = 0.5V, 2.5V VCM = 0.5V, 2.
PAGE 5
LTC6081/LTC6082 Electrical Characteristics The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 3V, V– = 0V, VCM = 0.5V unless otherwise noted. C, I SUFFIXES SYMBOL PARAMETER CONDITIONS MIN TYP 2 H SUFFIX MAX MIN TYP 2 MAX UNITS V V Shutdown Logic SHDN High SHDN Low THD Total Harmonic Distortion f = 10kHz, V+ = 3V, VOUT = 1VP-P , RL = 10k –90 –90 dB tON Turn-On Time VSHDN = 0.
PAGE 6
LTC6081/LTC6082 Electrical Characteristics The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 5V, V– = 0V, VCM = 0.5V unless otherwise noted. C, I SUFFIXES SYMBOL PARAMETER CONDITIONS MIN ISC Output Short-Circuit Current Source Sink SR Slew Rate AV = 1 GBW Gain-Bandwidth Product (fTEST = 50kHz) RL = 100k F0 Phase Margin RL = 10k tS Settling Time 0.
PAGE 7
LTC6081/LTC6082 Typical Performance Characteristics VOS Drift Histogram 25 20 15 10 5 0 –0.20 –0.10 0 0.10 VOSDRIFT (µV/°C) 20 10 5 –15 60812 G02 60812 G03 VOS vs VCM 140 100 80 0 4 –20 2 –30 0 –9.5 –40 –1.5 2.5 VOS (µV) 6.5 10.5 0 SOURCING CURRENT –4 –20 0 0.5 1.0 1.5 2.0 VCM (V) 2.5 –40 3.0 SINKING CURRENT 0 2 –2 OUTPUT CURRENT (mA) 4 VS = 3V 60812 G07 60812 G06 80 70 60 50 40 VS = 5V VCM = 0.5V 30 20 0 5 90 0 –5 4 TA = 25°C 100 VS = 3V VCM = 0.
PAGE 8
LTC6081/LTC6082 Typical Performance Characteristics 0.1Hz to 10Hz Output Voltage Noise Noise Voltage vs Frequency NMOS INPUTS VCM = 2.5V 1 10 100 1k FREQUENCY (Hz) 0 100k 10k 60812 G10 5 10 15 20 25 30 35 40 45 50 TIME (s) 0 40 IBIAS vs VCM 500 LTC6081MS8 VS = 5V 30 300 200 TA = 70°C 0 –10 40 60 80 100 TEMPERATURE (°C) 120 140 100 0 –100 –20 20 IBIAS (pA) 10 0.1 TA = 85°C –200 –30 –300 –40 –400 –50 60812 G13 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.
PAGE 9
LTC6081/LTC6082 Typical Performance Characteristics TA = 25°C NO BYPASS CAPACITOR VS = 5V VS = 3V 330 310 290 270 1200 800 2 400 1 0 100 0 200 300 TIME (µs) Open Loop Gain INPUT VOLTAGE (µV) RL = 2k 0 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) 2.5 3.0 RL = 100k –10 RL = 10k –20 RL = 2k 0 80 –180 GAIN –40 100 –90 0 –20 VS = 5V VCM = 0.5V TA = 25°C CL = 200pF 1k 10k 1M 100k FREQUENCY (Hz) 10M 0 –90 0 –40 1k 10k –270 1M 100k FREQUENCY (Hz) 10M VS = 5V VCM = 0.
PAGE 10
LTC6081/LTC6082 Typical Performance Characteristics Output Voltage Swing vs Load Current Channel Separation vs Frequency CHANNEL SEPARATION (dB) –20 –40 –60 –80 –100 –120 –140 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 60812 G28 –20 +VS VS = 3V +VS –0.5 V = 0.5V CM +VS –1.0 SOURCE –40 +VS –1.5 +VS –2.0 –VS 2.0 –VS 1.5 –VS 1.0 –VS 0.5 –VS 0 0.01 VS = 5V AV = 1 RL = 10k VOUT = 2VP-P –30 DISTORTION (dBc) VS = 3V VCM = 0.
PAGE 11
LTC6081/LTC6082 Applications Information Preserving Input Precision Rail-to-Rail Input Preserving input accuracy of the LTC6081/LTC6082 requires that the application circuit and PC board layout do not introduce errors comparable or greater than the 5µV typical offset of the amplifiers.
PAGE 12
LTC6081/LTC6082 Applications Information PC Board Layout Mechanical stress on a PC board and soldering-induced stress can cause the VOS and VOS drift to shift. The DD and DHC packages are more sensitive to stress. A simple way to reduce the stress-related shifts is to mount the IC near the short edge of the PC board, or in a corner. The board edge acts as a stress boundary, or a region where the flexure of the board is minimum.
PAGE 13
LTC6081/LTC6082 Typical Applications Low Side Current Sense 15pF VDD V+ I 100k – LOAD 1/2 LTC6081 + RSH 1k VOUT = RSH • I • 101 eNOISE = 3µVP-P, RTI BW ~ 1kHz 60812 TA03 Two Op-Amp Instrumentation Amplifier GAIN TRIM 1.96k 100k 100k V+ 0.1µF CMRR TRIM 976k 1M – 50k 1/2 LTC6081 – VIN + + 100k – 1/2 LTC6081 VOUT = 1011 • VIN + V– 0.1µF 60812 TA04 60812fd For more information www.linear.
PAGE 14
LTC6081/LTC6082 Typical Applications Thermocouple Amplifier 5V 0.1µF 1M + 1µF 1M 1/2 LTC6081 VOUT = 10mV/°C 0°C TO 500°C – 5V LT1025 2.49M K R– 10k 100pF SENSOR: OMEGA 5TC-TT-K-30-36 K-TYPE THERMOCOUPLE 1M RESISTORS PROTECT CIRCUIT TO ±350V WITH NO PHASE REVERSAL OF AMPLIFIER OUTPUT 1pA MAX IBIAS TRANSLATES TO 0.05°C ERROR 60812 TA05 20µV VOS → 0.5°C OFFSET Precision Nanoamp Bidirectional Current Source VIN 100k + 1/4 LTC6082 100Ω – 1k GAIN TRIM 100Ω 0.01µF 5k 97.6k 100k 10-TURN 0.
PAGE 15
LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699 Rev C) 0.70 ±0.05 3.55 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 ±0.10 (4 SIDES) R = 0.125 TYP 6 0.40 ±0.10 10 1.65 ±0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.
PAGE 16
LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DHC Package 16-Lead Plastic DFN (5mm × 3mm) (Reference LTC DWG # 05-08-1706 Rev Ø) 0.65 ±0.05 3.50 ±0.05 1.65 ±0.05 2.20 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 4.40 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 5.00 ±0.10 (2 SIDES) R = 0.20 TYP 3.00 ±0.10 (2 SIDES) 9 R = 0.115 TYP 0.40 ±0.10 16 1.65 ±0.
PAGE 17
LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641 Rev B) .189 – .196* (4.801 – 4.978) .045 ±.005 16 15 14 13 12 11 10 9 .254 MIN .009 (0.229) REF .150 – .165 .229 – .244 (5.817 – 6.198) .0165 ±.0015 .150 – .157** (3.810 – 3.988) .0250 BSC RECOMMENDED SOLDER PAD LAYOUT 1 .015 ±.004 × 45° (0.38 ±0.10) .007 – .0098 (0.178 – 0.249) .
PAGE 18
LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev G) 0.889 ±0.127 (.035 ±.005) 5.10 (.201) MIN 3.20 – 3.45 (.126 – .136) 3.00 ±0.102 (.118 ±.004) (NOTE 3) 0.65 (.0256) BSC 0.42 ± 0.038 (.0165 ±.0015) TYP 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ±0.102 (.118 ±.004) (NOTE 4) 4.90 ±0.152 (.193 ±.
PAGE 19
LTC6081/LTC6082 Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 3/10 Change LT to LTC on all part numbers in Order Information Section. 3 C 07/10 Update to Simplified Schematic 12 D 12/13 Corrected resistor value (10M) 14 60812fd Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 20
LTC6081/LTC6082 Typical Application Single Supply Strain Gauge Amplifier 3V CMRR TRIM 350Ω 10M 9.76M 3.2V 0.1µF 350Ω 3V 10k 0.01µF 100Ω 100k 500k 0.1µF LT1790B 1.25V 1/2 LTC6081 + 1/2 LTC6081 10M – 1.25V – 10M AV = 1001 + SENSOR: OMEGA SG-3/350-LY41 STRAIN GAUGE 60812 TA02 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1678/LT1679 Dual/Quad Precision Op Amps Low Noise, 2.7V to 36V Operation LTC2050 Zero-Drift Op Amp 2.