LT1128

Manufacturer Part NumberLT1128
DescriptionUltra Low Noise Precision High Speed Op Amps
ManufacturerLinear Technology Corporation
LT1128 datasheet
 
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FEATURES
Voltage Noise
1.1nV/ Hz Max at 1kHz
0.85nV/ Hz Typ at 1kHz
1.0nV/ Hz Typ at 10Hz
35nV
Typ, 0.1Hz to 10Hz
P-P
Voltage and Current Noise 100% Tested
Gain-Bandwidth Product
LT1028: 50MHz Min
LT1128: 13MHz Min
Slew Rate
LT1028: 11V/ s Min
LT1128: 5V/ s Min
Offset Voltage: 40 V Max
Drift with Temperature: 0.8 V/ C Max
Voltage Gain: 7 Million Min
Available in 8-Pin SO Package
U
APPLICATIO S
Low Noise Frequency Synthesizers
High Quality Audio
Infrared Detectors
Accelerometer and Gyro Amplifiers
350 Bridge Signal Conditioning
Magnetic Search Coil Amplifiers
Hydrophone Amplfiers
U
TYPICAL APPLICATIO
Flux Gate Amplifier
SQUARE
FLUX GATE
WAVE
TYPICAL
DRIVE
SCHONSTEDT
1kHz
#203132
Ultralow Noise Precision
DESCRIPTIO
®
The LT
1028(gain of –1 stable)/LT1128(gain of +1 stable)
achieve a new standard of excellence in noise performance
with 0.85nV/ Hz 1kHz noise, 1.0nV/ Hz 10Hz noise. This
ultralow noise is combined with excellent high speed
specifications (gain-bandwidth product is 75MHz for
LT1028, 20MHz for LT1128), distortion-free output, and
true precision parameters (0.1 V/ C drift, 10 V offset
voltage, 30 million voltage gain). Although the LT1028/
LT1128 input stage operates at nearly 1mA of collector
current to achieve low voltage noise, input bias current is
only 25nA.
The LT1028/LT1128’s voltage noise is less than the noise
of a 50
impedance transducer or audio amplifier applications, the
LT1028/LT1128’s contribution to total system noise will
be negligible.
, LTC and LT are registered trademarks of Linear Technology Corporation
DEMODULATOR
SYNC
+
OUTPUT TO
LT1028
DEMODULATOR
1k
50
1028/1128 TA01
LT1028/LT1128
High Speed Op Amps
U
resistor. Therefore, even in very low source
Voltage Noise vs Frequency
10
V
= 15V
S
T
= 25 C
MAXIMUM
A
1/f CORNER = 14Hz
TYPICAL
1
1/f CORNER = 3.5Hz
0.1
0.1
1
10
100
FREQUENCY (Hz)
1028/1128 TA02
1k
1

LT1128 Summary of contents

  • Page 1

    ... LT1028, 20MHz for LT1128), distortion-free output, and true precision parameters (0 drift offset voltage, 30 million voltage gain). Although the LT1028/ LT1128 input stage operates at nearly 1mA of collector current to achieve low voltage noise, input bias current is only 25nA. The LT1028/LT1128’s voltage noise is less than the noise ...

  • Page 2

    ... Consult LTC Marketing for parts specified with wider operating temperature ranges (Note 1) Operating Temperature Range LT1028/LT1128AM, M (OBSOLETE) . – 125 C LT1028/LT1128AC, C (Note 11) ......... – Storage Temperature Range All Devices ........................................ – 150 C Lead Temperature (Soldering, 10 sec.)................. 300 ORDER PART NUMBER LT1028AMH V OS ...

  • Page 3

    ... LT1028AM LT1128AM CONDITIONS MIN (Note 2) (Note 10 10.3V 106 4.5V to 16V 110 10V 3 1k 10V 2 10.3 L LT1028/LT1128 LT1028M/C LT1128M/C TYP MAX MIN TYP MAX 0.3 0 100 180 1.00 1.7 1.0 1.9 0.85 1.1 0.9 1.2 4.7 10.0 4.7 12.0 1.0 1.6 1.0 1.8 ...

  • Page 4

    ... Note 10: This parameter guaranteed by design, fully warmed includes chip temperature increase due to supply and load currents. Note 11: The LT1028/LT1128 are designed, characterized and expected to meet these extended temperature limits, but are not tested at –40 C and 85 C. Guaranteed I grade parts are available. Consult factory. ...

  • Page 5

    ... UNMATCHED SOURCE RESISTANCE ( ) LT1028/1128 • TPC05 0.01Hz to 1Hz Voltage Noise V = 15V 10nV TIME (SEC) LT1028/1128 • TPC08 LT1028/LT1128 Wideband Voltage Noise (0.1Hz to Frequency Indicated 15V 0.1 0.01 100 1k 10k 100k BANDWIDTH (Hz) LT1028/1128 • TPC03 ...

  • Page 6

    ... LT1028/LT1128 W U TYPICAL PERFOR A Distribution of Input Offset Voltage 15V 800 UNITS TESTED 16 FROM FOUR RUNS –50 –40 –30 –20 – OFFSET VOLTAGE ( V) LT1028/1128 • TPC10 Warm-Up Drift 15V ...

  • Page 7

    ... – – 200 –100 –10 0 100M 10 100 1000 CAPACITIVE LOAD (pF) LT1128 Capacitance Load Handling 70 80 30pF – – – 200 S ...

  • Page 8

    ... A = – 15pF 80pF F L LT1128 Small-Signal Transient Response 50mV 0V –50mV 0.2 s/DIV 10pF V L LT1128 Slew Rate, Gain-Bandwidth Product vs Over-Compensation Capacitor 100 100 GBW GBW 10 10 SLEW RATE SLEW RATE 1 1 0.1 0 100 100 1000 1000 10000 ...

  • Page 9

    ... SUPPLY POSITIVE 80 SUPPLY 10M 0 100 1k 10k FREQUENCY (Hz) High Frequency Voltage Noise vs Frequency 10 1.0 0.1 10k 100k 100k FREQUENCY (Hz) LT1128 Total Harmonic Distortion vs Closed-Loop Gain V = 20V O P-P NON-INVERTING f = 1kHz GAIN V = 15V 10k L INVERTING GAIN MEASURED EXTRAPOLATED 10 100 1k 10k ...

  • Page 10

    ... PPLICATI S I FOR ATIO Voltage Noise vs Current Noise The LT1028/LT1128’s less than 1nV/ Hz voltage noise is three times better than the lowest voltage noise heretofore available (on the LT1007/1037). A necessary condition for such low voltage noise is operating the input transistors at nearly 1mA of collector currents, because voltage noise is inversely proportional to the square root of the collector current ...

  • Page 11

    ... Even a 10 resistor will show an apparent noise which 10% too high. The 0.1Hz to 10Hz peak-to-peak noise of the LT1028/ LT1128 is measured in the test circuit shown. The fre- quency response of this noise tester indicates that the 0.1Hz corner is defined by only one zero. The test time to measure 0 ...

  • Page 12

    ... Offset Voltage Adjustment The input offset voltage of the LT1028/LT1128 and its drift with temperature, are permanently trimmed at wafer test- ing to a low level. However, if further adjustment of V necessary, the use nulling potentiometer will not degrade drift with temperature ...

  • Page 13

    ... The circuit shown to measure offset voltage is also used as the burn-in configuration for the LT1028/LT1128. Test Circuit for Offset Voltage and Offset Voltage Drift with Temperature 10k* ...

  • Page 14

    ... The presence of the 10pF capacitor cancels this pole and reduces overshoot to 5%. Over-Compensation The LT1028/LT1128 are equipped with a frequency over- compensation terminal (Pin 5). A capacitor connected between Pin 5 and the output will reduce noise bandwidth. Details are shown on the Slew Rate, Gain-Bandwidth Product vs Over-Compensation Capacitor plot ...

  • Page 15

    ... LT1028 OUTPUT + 0 1028/1128 TA03 10k GYRO TYPICAL– NORTHROP CORP. GR-F5AH7-5B SINE DRIVE – LT1028 OUTPUT + 10k 1028/1128 TA08 LT1028/LT1128 Phono Preamplifier 10 787 0.1 F 15V 10k 2 7 – 0. 100pF LT1028 47k –15V ALL RESISTORS METAL FILM MAG PHONO ...

  • Page 16

    ... LT1028/LT1128 U TYPICAL APPLICATIO S C1 0.047 2k R2 560 INPUT 1028/1128 TA11 16 Super Low Distortion Variable Sine Wave Oscillator R1 C2 0.047 LT1028 – 5.6k 2.4k 10pF 22k 15 F 10k – 2N4338 100k LT1055 TRIM FOR + 20k LOWEST DISTORTION <0.0018% DISTORTION AND NOISE. MEASUREMENT LIMITED BY RESOLUTION OF ...

  • Page 17

    ... NON- Q7 INVERTING INPUT 4 4.5 A 4 INVERTING INPUT 0 2 1.8mA Q3 BIAS R7 80 – 50pF for LT1028 C2 = 275pF for LT1128 Q4 C1 257pF R10 Q17 400 Q16 Q18 Q11 Q9 Q8 Q10 1.5 A Q12 Q13 Q14 1.5 A 300 A Q15 R8 480 Q20 LT1028/LT1128 1.1mA 2 ...

  • Page 18

    ... LT1028/LT1128 PACKAGE DESCRIPTIO OBSOLETE PACKAGE 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.300 BSC (0.762 BSC) 0.008 – 0.018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS 0.300 – 0.325 (7.620 – 8.255) (1.651) 0.009 – 0.015 (0.229 – ...

  • Page 19

    ... LTC DWG # 05-08-1330) (8.509 – 9.398) (7.747 – 8.509) 0.040 (1.016) MAX 0.230 (5.842) SEATING TYP PLANE 0.010 – 0.045* (0.254 – 1.143) OBSOLETE PACKAGE LT1028/LT1128 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) ...

  • Page 20

    ... LT1028/LT1128 U TYPICAL APPLICATIO 100 100 F OPTICAL 267 CHOPPER WHEEL 1000 F IR RADIATION 39 PHOTO- ELECTRIC PICK-OFF INFRA RED ASSOCIATES, INC. HgCdTe IR DETECTOR RELATED PARTS PART NUMBER DESCRIPTION LT1806/LT1807 325MHz, 3.5nV/ Hz Single and Dual Op Amps Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ...