Datasheet

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LT1677

1677fa

Low Noise, Rail-to-Rail

Precision Op Amp

■

Rail-to-Rail Input and Output

■

100% Tested Low Voltage Noise:

3.2nV/√Hz Typ at 1kHz

4.5nV/√Hz Max at 1kHz

■

Offset Voltage: 60µV Max

■

Low V

Drift: 0.2µV/°C Typ

■

Low Input Bias Current: 20nA Max

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Wide Supply Range: 3V to ±18V

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High A

VOL

: 7V/µV Min, R

= 10k

■

High CMRR: 109dB Min

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High PSRR: 108dB Min

■

Gain Bandwidth Product: 7.2MHz

■

Slew Rate: 2.5V/µs

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Operating Temperature Range: –40°C to 85°C

The LT

1677 features the lowest noise performance avail-

able for a rail-to-rail operational amplifier: 3.2nV/√Hz

wideband noise, 1/f corner frequency of 13Hz and 90nV

peak-to-peak 0.1Hz to 10Hz noise. Low noise is combined

with outstanding precision: 20µV offset voltage and

0.2µV/°C drift, 130dB common mode and power supply

rejection and 7.2MHz gain bandwidth product. The com-

mon mode range exceeds the power supply by 100mV.

The voltage gain of the LT1677 is extremely high, 19 million

(typical) driving a 10k load.

In the design, processing and testing of the device, particular

attention has been paid to the optimization of the entire

distribution of several key parameters. Consequently, the

specifications have been spectacularly improved compared

to competing rail-to-rail amplifiers.

3V Electret Microphone Amplifier

■

Low Noise Signal Processing

■

Microvolt Accuracy Threshold Detection

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Strain Gauge Amplifiers

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Tape Head Preamplifiers

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Direct Coupled Audio Gain Stages

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Infrared Detectors

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Battery-Powered Microphones

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

10k

= –100

10k

PANASONIC

ELECTRET

CONDENSER

MICROPHONE

WM-61

www.panasonic.com/pic

(714) 373-7334

0.68µF

23Hz

HIGHPASS

TO PA

HEADPHONES

–

LT1677

1.5V

–1.5V

1677 TA01

INPUT OFFSET VOLTAGE (µV)

–40

PERCENT OF UNITS

–10 10 40

1677 TA02

–30 –20

20 30

= 25°C

= ±15V

Distribution of Offset Voltage

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Summary of content (20 pages)

PAGE 1
LT1677 Low Noise, Rail-to-Rail Precision Op Amp U FEATURES DESCRIPTIO ■ The LT ®1677 features the lowest noise performance available for a rail-to-rail operational amplifier: 3.2nV/√Hz wideband noise, 1/f corner frequency of 13Hz and 90nV peak-to-peak 0.1Hz to 10Hz noise. Low noise is combined with outstanding precision: 20µV offset voltage and 0.2µV/°C drift, 130dB common mode and power supply rejection and 7.2MHz gain bandwidth product. The common mode range exceeds the power supply by 100mV.
PAGE 2
LT1677 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) Supply Voltage ...................................................... ±22V Input Voltages (Note 2) ............ 0.3V Beyond Either Rail Differential Input Current (Note 2) ..................... ± 25mA Output Short-Circuit Duration (Note 3) ............ Indefinite Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec.).................
PAGE 3
LT1677 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 3V, VCM = VO = 1.7V; VS = 5V, VCM = VO = 2.5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 6) en Input Noise Voltage 0.1Hz to 10Hz (Note 7) VCM = VS VCM = 0V 90 180 600 nVP-P nVP-P nVP-P Input Noise Voltage Density (Note 8) fO = 10Hz VCM = VS, fO = 10Hz VCM = 0V, fO = 10Hz 5.
PAGE 4
LT1677 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 3V, VCM = VO = 1.7V; VS = 5V, VCM = VO = 2.5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 6) VOL Output Voltage Swing Low (Note 11) Above GND ISINK = 0.
PAGE 5
LT1677 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = VO = 0V unless otherwise noted.
PAGE 6
LT1677 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = VO = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 6) MIN TYP CMRR Common Mode Rejection Ratio VCM = –13.3V to 14V ● 109 105 130 124 dB dB ● 74 72 95 91 dB dB ● 106 103 130 125 dB dB VS = 2.7V to 40V VS = 3.
PAGE 7
LT1677 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = VO = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 6) THD Total Harmonic Distortion RL = 2k, AV = 1, fO = 1kHz, VO = 10VP-P MIN tS Settling Time RO Open-Loop Output Resistance Closed-Loop Output Resistance IS Supply Current TYP MAX UNITS 0.0006 % 10V Step 0.1%, AV = +1 10V Step 0.
PAGE 8
LT1677 U W TYPICAL PERFOR A CE CHARACTERISTICS Voltage Noise vs Temperature 6 10Hz 5 4 1kHz 3 10 VS = ±15V 9 VCM = 0V VS = ±15V TA = 25°C VCM < –13.5V 1/f CORNER 180Hz 1 VCM –13.5V TO 14.5V 1/f CORNER 90Hz 1/f CORNER 60Hz 50 25 0 75 TEMPERATURE (°C) 100 100 1000 FREQUENCY (Hz) 10 125 600 VCM = 14.7V CURRENT INTO DUT 200 VS = ±15V TA = 25°C 50 25 0 75 TEMPERATURE (°C) 100 125 400 VCM = –13.6V 200 VCM = 15.15V INPUT BIAS CURRENT 0 VCM = 14.3V –200 VCM = –15.
PAGE 9
LT1677 U W TYPICAL PERFOR A CE CHARACTERISTICS Common Mode Range vs Temperature VOS vs Temperature of Representative Units OFFSET VOLTAGE (mV) 80 5 2.0 200 4 1.5 150 60 40 20 0 –20 VS = ±2.5V TO ±15V 125°C 1.0 0.5 100 25°C –55°C 0 0 –0.5 –50 VOS IS REFERRED 125°C TO VCM = 0V –1.0 –100 25°C 3 2 1 0 –1 –2 –3 –40 –1.5 –150 –60 –2.0 –200 –4 –80 –55 –35 –15 –2.5 –1.0 –250 –5 V– 2.0 –0.8 –0.4 1.
PAGE 10
LT1677 U W TYPICAL PERFOR A CE CHARACTERISTICS Large-Signal Transient Response GAIN BANDWIDTH PRODUCT, fO = 100kHz (MHz) PHASE MARGIN (DEG) PM, GBWP, SR vs Temperature 70 VS = ±15V CL = 15pF PHASE 60 8 GBW 7 50 6 5 SLEW RATE (V/µs) 3 4 SLEW 2 1 –50 –25 50 25 0 75 TEMPERATURE (°C) Small-Signal Transient Response 50mV 10V 0 – 10V – 50mV AVCL = – 1 VS = ±15V 5µs/DIV AVCL = 1 VS = ±15V CL = 15pF 0.5µs/DIV 125 100 1677 G22 Settling Time vs Output Step (Noninverting) 0.
PAGE 11
LT1677 U W TYPICAL PERFOR A CE CHARACTERISTICS SHORT-CIRCUIT CURRENT (mA) SINKING SOURCING 1 AV = +100 0.1 AV = +1 0.01 100 10 10k 1k FREQUENCY (Hz) –55°C 30 25°C 20 125°C 10 –30 –35 125°C –40 –55°C –45 1M 0 AV = –100 0.001 AV = –10 AV = –1 0.0001 20 100 1k FREQUENCY (Hz) 10k 20k 1677 G31 0.01 AV = 100 0.
PAGE 12
LT1677 U W U U APPLICATIO S I FOR ATIO General The LT1677 series devices may be inserted directly into OP-07, OP-27, OP-37 and sockets with or without removal of external compensation or nulling components. In addition, the LT1677 may be fitted to 741 sockets with the removal or modification of external nulling components. The adjustment range with a 10kΩ pot is approximately ±2.5mV.
PAGE 13
LT1677 U W U U APPLICATIO S I FOR ATIO Offset Voltage and Drift Thermocouple effects, caused by temperature gradients across dissimilar metals at the contacts to the input terminals, can exceed the inherent drift of the amplifier unless proper care is exercised. Air currents should be minimized, package leads should be short, the two input leads should be close together and maintained at the same temperature.
PAGE 14
LT1677 U W U U APPLICATIO S I FOR ATIO 100 0.1µF 90 100k – 2k * LT1677 + + 4.3k – 2.2µF VOLTAGE GAIN = 50,000 24.3k 500k + 0.1 1 10 FREQUENCY (Hz) 100 Figure 6b. 0.1Hz to 10Hz Peak-to-Peak Noise Tester Frequency Response root of the input stage current. Therefore, the LT1677’s current noise will be relatively high. At low frequencies, the low 1/f current noise corner frequency (≈ 90Hz) minimizes current noise to some extent.
PAGE 15
LT1677 U W U U APPLICATIO S I FOR ATIO Rail-to-Rail Input Rail-to-Rail Output The LT1677 has the lowest voltage noise, offset voltage and highest gain when compared to any rail-to-rail op amp. The input common mode range for the LT1677 can exceed the supplies by at least 100mV. As the common mode voltage approaches the positive rail (+VS – 0.7V), the tail current for the input pair (Q1, Q2) is reduced, which prevents the input pair from saturating (refer to the Simplified Schematic).
PAGE 16
LT1677 U TYPICAL APPLICATIO S Microvolt Comparator with Hysteresis 3V Strain Gauge Amplifier 3V 3V 10M 5% 3 + 7 1 INPUT 2 – 15k 1% LT1677 6 R11 1k 15k 1% R9 3.4Ω R8 7.5Ω R* R* R* R* R7 22.1Ω R2 5Ω OUTPUT R10 232Ω 4 R3 5.49k R5 698Ω 3V + 1677 TA03 – POSITIVE FEEDBACK TO ONE OF THE NULLING TERMINALS CREATES APPROXIMATELY 5µV OF HYSTERESIS. OUTPUT CAN SINK 16mA INPUT OFFSET VOLTAGE IS TYPICALLY CHANGED LESS THAN 5µV DUE TO THE FEEDBACK VOUT LT1677 R* R4 5.
PAGE 17
LT1677 U TYPICAL APPLICATIO S 3V Super Electret Microphone Amplifier with DC Servo 1.5V 1.5V 2N3906 2N3906 C1 10pF R1 1M 16kHz ROLL OFF 3 – + R3 1M 2 – 3 + 7 LT1677 R5 2k 1.5V 1.5V 2 C3 0.022µF 7Hz POLE FOR SERVO 7 LT1677 6 4 6 –1.5V 4 R2 80k –1.5V C4 1µF PANASONIC ELECTRET CONDENSER MICROPHONE WM-61 (714) 373-7334 R4 8k C2 100pF 20kHz ROLL OFF 1.5V 2 3 – + 7 LT1677 6 TO HEADPHONES 4 –1.5V –1.
PAGE 18
Q13 ×2 IA Q21 R21 100Ω R24 100Ω Q24 Q8 Q9 R9 200Ω Q1A RC1A 6k Q3 Q1B Q12 100µA IC Q2A Q10 PAD 8 Q2B RC2A 6k RC2B 1k Q6 Q4 ID 50µA Q11 Q7 IC = 200µA VCM < 0.7V BELOW +VS ID = 100µA VCM < 0.7V BELOW +VS 50µA VCM > 0.7V BELOW +VS 0µA VCM > 0.7V BELOW +VS R8 200Ω D2 D3 IB D1 D4 IA, IB = 0µA VCM > 1.5V ABOVE –VS 200µA VCM < 1.
PAGE 19
LT1677 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .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 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 .100 (2.54) BSC (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 20
LT1677 U TYPICAL APPLICATIO gain of ~107. Components R5 and Q1 convert the voltage into a current for transmission back to R10, which converts it into a voltage again. The LM334 and 2N3904 are not temperature compensated so the DC output contains temperature information. This 2-wire remote Geophone preamp operates on a current-loop principle and so has good noise immunity. Quiescent current is ≈10mA for a VOUT of 2.5V. Excitation will cause AC currents about this point of ~±4mA for a VOUT of ~±1V max.