Datasheet

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

LT1124/LT1125

11245ff

For more information www.linear.com/LT1124

100% Tested Low Voltage Noise:

2.7nV/√Hz Typ

4.2nV/√Hz Max

Slew Rate: 4.5V/µs Typ

Gain-Bandwidth Product: 12.5MHz Typ

Offset Voltage,

Prime Grade: 70µV Max

Low Grade:

100µV Max

High Voltage Gain: 5 Million Min

Supply Current Per Amplifier: 2.75mA Max

Common Mode Rejection: 112dB Min

Power Supply Rejection: 116dB Min

Available in 8-Pin SO Package

Typical applicaTion

DescripTion

Dual/Quad Low Noise,

High Speed Precision Op Amps

The LT

1124 dual and LT1125 quad are high performance

op amps that offer higher gain, slew rate and bandwidth

than the industry standard OP-27 and competing OP-270/

OP-470 op amps. In addition, the LT1124/LT1125 have

lower I

and I

than the OP-27; lower V

and noise

than the OP-270/OP-470.

In the design, processing and testing of the device, par-

ticular attention has been paid to the optimization of the

entire distribution of several key parameters. Slew rate,

gain bandwidth and 1kHz noise are 100% tested for each

individual amplifier. Consequently, the specifications

of even the lowest cost grades (the LT1124C and the

LT1125C) have been spectacularly improved compared

to equivalent grades of competing amplifiers.

Power consumption of the LT1124 is one-half of two

OP-27s. Low power and high performance in an 8-pin

SO package make the LT1124 a first choice for surface

mounted systems and where board space is restricted.

For a decompensated version of these devices, with three

times higher slew rate and bandwidth, please see the

LT1126/LT1127 data sheet.

L, LT, LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 4775884, 4837496.

FeaTures

applicaTions

Tw o and Three Op Amp Instrumentation Amplifiers

Low Noise Signal Processing

Active Filters

Microvolt Accuracy Threshold Detection

Strain Gauge Amplifiers

Direct Coupled Audio Gain Stages

Tape Head Preamplifiers

Infrared Detectors

Instrumentation Amplifier with Shield Driver

Input Offset Voltage Distribution

(All Packages, LT1124 and LT1125)

–

1/4

LT1125

1124/25 TA01

–

1/4

LT1125

1/4

LT1125

–15V

15V

OUTPUT

1/4

LT1125

30k1k

3.4k

100Ω

3.4k

30k

–

INPUT

GUARD

= 30 (1 + R

) ≈ 1000

= 170kHz

= 400kHz

= 3.8µV/ Hz

AT OUTPUT

= 35µV

√

GAIN

POWER BW

SMALL-SIGNAL BW

NOISE

100Ω

–

INPUT OFFSET VOLTAGE (µV)

–100

PERCENT OF UNITS

1124/25 TA02

–60 –20

= ±15V

= 25°C

DUALS

QUADS

2316 UNITS

TESTED

758

200

100

Summary of content (20 pages)

PAGE 1
LT1124/LT1125 Dual/Quad Low Noise, High Speed Precision Op Amps Description Features n n n n n n n n n 100% Tested Low Voltage Noise: 2.7nV/√Hz Typ 4.2nV/√Hz Max Slew Rate: 4.5V/µs Typ Gain-Bandwidth Product: 12.5MHz Typ Offset Voltage, Prime Grade: 70µV Max Low Grade: 100µV Max High Voltage Gain: 5 Million Min Supply Current Per Amplifier: 2.
PAGE 2
LT1124/LT1125 Absolute Maximum Ratings (Note 1) Supply Voltage.........................................................±22V Input Voltages.............................Equal to Supply Voltage Output Short-Circuit Duration........................... Indefinite Differential Input Current (Note 6)........................±25mA Lead Temperature (Soldering, 10 sec).................... 300°C Storage Temperature Range...................
PAGE 3
LT1124/LT1125 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1124CS8#PBF LT1124CS8#TRPBF 1124 8-Lead Plastic SO, Rotated Pinout 0°C to 70°C LT1124AIS8#PBF LT1124AIS8#TRPBF 1124AI 8-Lead Plastic SO, Rotated Pinout –40°C to 85°C LT1124IS8#PBF LT1124IS8#TRPBF 1124I 8-Lead Plastic SO, Rotated Pinout –40°C to 85°C LT1124AMPS8#PBF LT1124AMPS8#TRPBF 124AMP 8-Lead Plastic SO, Rotated Pinout –55°C to 125°C LT1124CS8-1#PBF LT1
PAGE 4
LT1124/LT1125 Electrical Characteristics TA = 25°C, VS = ±15V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 2) VOS Input Offset Voltage LT1124 LT1125 ∆VOS ∆Time Long-Term Input Offset Voltage Stability IOS Input Offset Current IB Input Bias Current en Input Noise Voltage Input Noise Voltage Density in Input Noise Current Density VCM Input Voltage Range LT1124AC/AI/AM LT1125AC/AM MIN TYP MAX LT1124C/I/M LT1125C/M MIN TYP MAX 20 25 25 30 70 90 0.
PAGE 5
LT1124/LT1125 Electrical Characteristics temperature range, VS = ±15V, unless otherwise noted. The l denotes the specifications which apply over the 0°C ≤ TA ≤ 70°C LT1124AC LT1125AC MIN TYP MAX LT1124C LT1125C MIN TYP MAX SYMBOL PARAMETER CONDITIONS (Note 2) VOS Input Offset Voltage LT1124 LT1125 l l 35 40 120 140 45 50 170 210 µV µV ∆VOS ∆Temp Average Input Offset Voltage Drift (Note 5) l 0.3 1 0.4 1.
PAGE 6
LT1124/LT1125 Electrical Characteristics Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers; i.e., out of 100 LT1125s (or 100 LT1124s) typically 240 op amps (or 120) will be better than the indicated specification.
PAGE 7
LT1124/LT1125 Typical Performance Characteristics Input Bias Current Over the Common Mode Range Output Short-Circuit Current vs Time 20 30 20 125°C 0 –10 125°C –20 25°C –30 –50 10 DEVICE WITH POSITIVE INPUT CURRENT 5 0 –5 DEVICE WITH NEGATIVE INPUT CURRENT –10 –15 –55°C –40 –20 –15 0 1 2 3 4 TIME FROM OUTPUT SHORT TO GND (MINUTES) 0 –10 –5 5 10 COMMON MODE INPUT VOLTAGE (V) Power Supply Rejection Ratio vs Frequency 60 +PSRR 40 60 40 20 1k 10k VS = ±15V TA = 25°C 18 16 100 60 20 1
PAGE 8
LT1124/LT1125 Typical Performance Characteristics Offset Voltage Drift with Temperature of Representative Units SUPPLY CURRENT PER AMPLIFIER (mA) VS = ±15V 40 OFFSET VOLTAGE (µV) 30 20 10 0 –10 –20 –30 –40 –50 –50 –25 Small-Signal Transient Response Supply Current vs Supply Voltage 3 0 25 50 75 TEMPERATURE (°C) 100 25°C 2 –50mV 1 0 ±5 ±10 ±15 SUPPLY VOLTAGE (V) 0 Output Voltage Swing vs Load Current V+ –0.
PAGE 9
LT1124/LT1125 Typical Performance Characteristics 0.010 AV = +100 AV = +10 0.001 AV = +1 0.0001 20 100 1k FREQUENCY (Hz) 10k 20k 0.1 0.010 AV = –100 AV = –1 0.0001 20 TOTAL HARMONIC DISTORTION + NOISE (%) TOTAL HARMONIC DISTORTION + NOISE (%) AV = +100 AV = +10 AV = +1 1 10 OUTPUT SWING (VP-P) 1k FREQUENCY (Hz) 0.1 OP270 OP27 0.001 LT1124 0.0001 20 10k 20k 1124/25 G23 30 1124/25 G25 0.010 ZL = 2k/15pF fO = 1kHz AV = –1, –10, –100 0.
PAGE 10
LT1124/LT1125 Applications Information The LT1124 may be inserted directly into OP-270 sockets. The LT1125 plugs into OP-470 sockets. Of course, all standard dual and quad bipolar op amps can also be replaced by these devices. (5µV/V). However, Table 1 can be used to estimate the expected matching performance between the two sides of the LT1124, and between amplifiers A and D, and between amplifiers B and C of the LT1125.
PAGE 11
LT1124/LT1125 Applications Information High Speed Operation When the feedback around the op amp is resistive (RF), a pole will be created with RF, the source resistance and capacitance (RS, CS), and the amplifier input capacitance (CIN ≈ 2pF). In low closed loop gain configurations and with RS and RF in the kilohm range, this pole can create excess phase shift and even oscillation. A small capacitor (CF) in parallel with RF eliminates this problem (see Figure 2).
PAGE 12
LT1124/LT1125 Performance Comparison Table 2 summarizes the performance of the LT1124/LT1125 compared to the low cost grades of alternate approaches. performance is degraded when compared to singles, for the LT1124/LT1125 this is not the case. The comparison shows how the specs of the LT1124/ LT1125 not only stand up to the industry standard OP-27, but in most cases are superior. Normally dual and quad Table 2.
PAGE 13
LT1124/LT1125 Schematic Diagram (1/2 LT1124, 1/4 LT1125) V+ 360µA Q7 570µA 100µA Q28 21k 200pF 21k 3.6k 3.6k 35pF Q27 Q18 Q9 Q13 Q8 Q17 Q10 Q26 Q19 NONINVERTING INPUT (+) 20Ω Q25 OUTPUT 900Ω Q20 20Ω V– Q1A Q2A Q1B 400Ω Q30 Q2B 67pF INVERTING INPUT (–) 20pF V+ Q3 Q29 V+ Q22 Q11 Q12 Q15 Q16 Q23 Q24 200µA 200µA 100µA 200Ω 6k 200Ω 6k 50Ω V– 1124/25 SS 11245ff For more information www.linear.
PAGE 14
LT1124/LT1125 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. J8Package Package J8 8-Lead CERDIP (Narrow (Narrow.300 .300Inch, Inch,Hermetic) Hermetic) 8-Lead CERDIP (ReferenceLTC LTCDWG DWG##05-08-1110) 05-08-1110) (Reference CORNER LEADS OPTION (4 PLCS) .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .005 (0.127) MIN .405 (10.287) MAX 8 7 6 5 .025 (0.635) RAD TYP .220 – .310 (5.
PAGE 15
LT1124/LT1125 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N8 Package Package 8-LeadN PDIP (Narrow .300 Inch) 8-Lead PDIPLTC (Narrow Inch) Rev I) (Reference DWG #.300 05-08-1510 (Reference LTC DWG # 05-08-1510 Rev I) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 (0.457 ±0.076) 8 7 6 5 1 2 3 4 .255 ±.015* (6.477 ±0.381) .120 (3.048) .020 MIN (0.
PAGE 16
LT1124/LT1125 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. J Package 14-Lead CERDIP (Narrow .300 Inch, Hermetic) J Package (Reference DWG .300 # 05-08-1110) 14-Lead CERDIPLTC (Narrow Inch, Hermetic) (Reference LTC DWG # 05-08-1110) .005 (0.127) MIN .785 (19.939) MAX 14 13 12 11 10 9 8 .220 – .310 (5.588 – 7.874) .025 (0.635) RAD TYP 1 .300 BSC (7.62 BSC) 2 3 4 5 6 7 .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .
PAGE 17
LT1124/LT1125 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N Package N Package 14-Lead PDIP (Narrow .300 Inch) 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) (Reference LTC DWG # 05-08-1510 Rev I) .770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 .255 ±.015* (6.477 ±0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1.
PAGE 18
LT1124/LT1125 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. SWPackage Package SW 16-Lead Plastic Small Outline (Wide (Wide .300 16-Lead Plastic Small Outline .300 Inch) Inch) (Reference LTC DWG # 05-08-1620) (Reference LTC DWG # 05-08-1620) .050 BSC .045 ±.005 .030 ±.005 TYP .398 – .413 (10.109 – 10.490) NOTE 4 16 N 15 14 13 12 11 10 9 N .325 ±.005 .420 MIN .394 – .419 (10.007 – 10.
PAGE 19
LT1124/LT1125 Revision History (Revision history begins at Rev D) REV DATE DESCRIPTION D 09/10 LT1124-1 added. Reflected throughout the data sheet. PAGE NUMBER E 10/10 Revised part marking for LT1124AMPS8-1 in Order Information section. F 01/14 LT1124-1 removed. 1 to 18 3 1 to 3 11245ff Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 20
LT1124/LT1125 Typical Application Strain Gauge Signal Conditioner with Bridge Excitation 15V 1k 5k 3 2.5V LT1009 2 + THE LT1124/LT1125 IS CAPABLE OF PROVIDING EXCITATION CURRENT DIRECTLY TO BIAS THE 350Ω BRIDGE AT 5V WITH ONLY 5V ACROSS THE BRIDGE (AS OPPOSED TO THE USUAL 10V) TOTAL POWER DISSIPATION AND BRIDGE WARM-UP DRIFT IS REDUCED. THE BRIDGE OUTPUT SIGNAL IS HALVED, BUT THE LT1124/LT1125 CAN AMPLIFY THE REDUCED SIGNAL ACCURATELY.