Datasheet

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

LT1126/LT1127

11267fa

FREQUENCY (Hz)

RMS VOLTAGE NOISE DENSITY (nV/ Hz)

100

0.1 10 100 1000

1126-7 TA01b

1.0

√

MAXIMUM

TYPICAL

V = 15V

T = 25°C

±

1/f CORNER

2.3Hz

GAIN = 1000, BANDWIDTH = 480kHz

INPUT REFERRED NOISE = 4.5nV/ Hz AT 1kHz, 6µV

RMS

OVER BANDWIDTH

–

1/4

LT1127

1126-7 TA01

OUTPUT

1/4

LT1127

10k

620

6.2k

200

6.2k

10k

√

Ω

– INPUT

Ω

620Ω

+ INPUT

1/4

LT1127

–

, LTC and LT 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.

The LT

1126 dual and LT1127 quad are high perfor-

mance, decompensated op amps that offer higher slew

rate and bandwidth than the LT1124 dual and the LT1125

quad operational amplifiers. The enhanced AC perfor-

mance is available without degrading DC specs of the

LT1124/LT1125. Both LT1126/LT1127 are stable in a gain

of 10 or more.

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 LT1126C and the LT1127C)

have been enhanced.

Power consumption of the dual LT1126 is less than one

half of two OP-37s. Low power and high performance in an

8-pin SO package makes the LT1126 a first choice for

surface mounted systems and where board space is

restricted.

■

Two 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

■

Microphone Preamplifiers

■

Accelerometer Amplifiers

■

Infrared Detectors

■

100% Tested Low Voltage Noise: 2.7nV/√Hz Typ,

4.2nV/√Hz Max

■

Slew Rate: 11V/µs Typ

■

Gain-Bandwidth Product: 65MHz Typ

■

Offset Voltage, Prime Grade: 70µV Max

Low Grade: 100µV Max

■

High Voltage Gain: 5 Million Min

■

Supply Current Per Amplifier: 3.1mA Max

■

Common Mode Rejection: 112dB Min

■

Power Supply Rejection: 116dB Min

■

Available in 8-Lead SOIC, 8-Lead DIP, 16-Lead SO

and 14-Lead DIP Packages

APPLICATIO S

TYPICAL APPLICATIO

DESCRIPTIO

FEATURES

Dual/Quad

Decompensated Low Noise,

High Speed Precision Op Amps

Low Noise, Wide Bandwidth Instrumentation Amplifier Voltage Noise vs Frequency

Summary of content (12 pages)

PAGE 1
LT1126/LT1127 Dual/Quad Decompensated Low Noise, High Speed Precision Op Amps U FEATURES DESCRIPTIO ■ The LT®1126 dual and LT1127 quad are high performance, decompensated op amps that offer higher slew rate and bandwidth than the LT1124 dual and the LT1125 quad operational amplifiers. The enhanced AC performance is available without degrading DC specs of the LT1124/LT1125. Both LT1126/LT1127 are stable in a gain of 10 or more. ■ ■ ■ ■ ■ ■ ■ ■ 100% Tested Low Voltage Noise: 2.7nV/√Hz Typ, 4.
PAGE 2
LT1126/LT1127 U W W W ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage ..................................................... ±22V Input Voltage ............................ Equal to Supply Voltage Output Short Circuit Duration .......................... Indefinite Differential Input Current (Note 5) ......................± 25mA Lead Temperature (Soldering, 10 sec.)................. 300°C Operating Temperature Range LT1126AM/LT1126M LT1127AM/LT1127M (OBSOLETE) ..
PAGE 3
LT1126/LT1127 ELECTRICAL CHARACTERISTICS VS = ±15V, TA = 25°C, unless otherwise noted. LT1126AM/AC LT1127AM/AC MIN TYP MAX LT1126M/C LT1127M/C MIN TYP MAX UNITS 25 30 0.3 µV µV µV/Mo SYMBOL PARAMETER CONDITIONS (Note 2) VOS Input Offset Voltage LT1126 LT1127 ∆VOS ∆Time IOS Long Term Input Offset Voltage Stability Input Offset Current 20 25 0.
PAGE 4
LT1126/LT1127 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
PAGE 5
LT1126/LT1127 U W TYPICAL PERFOR A CE CHARACTERISTICS The typical behavior of many LT1126/LT1127 parameters is identical to the LT1124/LT1125.
PAGE 6
LT1126/LT1127 U W TYPICAL PERFOR A CE CHARACTERISTICS Total Harmonic Distortion and Noise vs Frequency for Non-Inverting Gain 0.010 ZL = 2k/15pF VO = 20Vp-p AV = –10, –100 MEASUREMENT BANDWITH = 10Hz TO 80kHz AV = –100 0.001 0.0001 20 AV = –10 100 1k 10k 20k Intermodulation Distortion (CCIF Method)* vs Frequency 0.1 INTERMODULATION DISTORTION (IMD) (%) 0.
PAGE 7
LT1126/LT1127 U U W U APPLICATIO S I FOR ATIO High Speed Operation 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. With RS (CS + CIN) = RF CF, the effect of the feedback pole is completely removed. 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).
PAGE 8
LT1126/LT1127 UO TYPICAL APPLICATI S Low Noise, Wideband, Gain = 100 Amplifier with High Input Impedance 1.1k 120 – 1/4 LT1127 2.4k 500Ω 7.5k + 1.1k 120 2.4k – 1/4 LT1127 OUTPUT + – 1/4 LT1127 + INPUT 1.1k 120 –3dB BANDWIDTH = 910 kHz GAIN BANDWIDTH PRODUCT = 91.0MHz – 1/4 LT1127 + 2.4k WIDEBAND NOISE = 3.2nV/√Hz = 1.85nV/√Hz REFERRED TO INPUT √3 RMS NOISE DC TO FULL BANDWIDTH = 21.2µV REFERRED TO INPUT 1126-7 TA04 U PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow .
PAGE 9
LT1126/LT1127 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .300 – .325 (7.620 – 8.255) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 .400* (10.160) MAX .130 ± .005 (3.302 ± 0.127) 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 .100 (2.54) BSC (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 10
LT1126/LT1127 U PACKAGE DESCRIPTIO N Package 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 .255 ± .015* (6.477 ± 0.381) .130 ± .005 (3.302 ± 0.127) .300 – .325 (7.620 – 8.255) .045 – .065 (1.143 – 1.651) .020 (0.508) MIN .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE ) .120 (3.048) MIN .005 (0.127) .100 MIN (2.54) BSC .018 ± .003 (0.457 ± 0.
PAGE 11
LT1126/LT1127 U PACKAGE DESCRIPTIO SW Package 16-Lead Plastic Small Outline (Wide .300 Inch) (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 – 10.643) NOTE 3 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .005 (0.127) RAD MIN .009 – .013 (0.229 – 0.330) .291 – .299 (7.391 – 7.595) NOTE 4 .010 – .029 × 45° (0.254 – 0.737) 3 4 5 6 7 .093 – .104 (2.362 – 2.
PAGE 12
LT1126/LT1127 W W SCHE ATIC DIAGRA (1/2 LT1126, 1/4 LT1127) V+ 570µA 360µA Q7 100µA Q28 200pF 21k 21k 3.6k 3.