LINEAR TECHNOLOGY LT1678, LT1679 Technical data

FEATURES

LT1678/LT1679

Dual/Quad Low Noise,

Rail-to-Rail, Precision Op Amps

U

DESCRIPTIO

■

Rail-to-Rail Input and Output

■

100% Tested Low Voltage Noise:

3.9nV/√Hz Typ at 1kHz

5.5nV/√Hz Max at 1kHz

■

Single Supply Operation from 2.7V to 36V

■

Offset Voltage: 100µV Max

■

Low Input Bias Current: 20nA Max

■

High A

■

High CMRR: 100dB Min

■

High PSRR: 106dB Min

■

Gain Bandwidth Product: 20MHz

■

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

■

Matching Specifications

■

No Phase Inversion

■

8-Lead SO and 14-Lead SO Packages

: 3V/µV Min, RL = 10k

VOL

U

APPLICATIO S

■

Strain Gauge Amplifiers

■

Portable Microphones

■

Battery-Powered Rail-to-Rail Instrumentation

■

Low Noise Signal Processing

■

Microvolt Accuracy Threshold Detection

■

Infrared Detectors

®

The LT

1678/LT1679 are dual/quad rail-to-rail op amps

offering both low noise and precision: 3.9nV/√Hz wideband
noise, 1/f corner frequency of 4Hz and 90nV peak-to-peak

0.1Hz to 10Hz noise are combined with outstanding
precision: 100µV maximum offset voltage, greater than
100dB common mode and power supply rejection and
20MHz gain bandwidth product. The LT1678/LT1679 bring
precision as well as low noise to single supply applications as
low as 3V. The input range exceeds the power supply by
100mV with no phase inversion while the output can swing
to within 170mV of either rail.

The LT1678/LT1679 are offered in the SO-8 and SO-14
packages. A full set of matching specifications are also
provided, facilitating their use in matching dependent appli­cations such as a two op amp instrumentation amplifier
design. The LT1678/LT1679 are specified for supply volt­ages of ±15V, single 5V as well as single 3V. For a single
amplifier with similiar performance, see the LT1677 data
sheet.

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

TYPICAL APPLICATIO

Instrumentation Amplifier with Shield Driver

3

+

1/4

LT1679

2

–

GUARD

INPUT

+
–

GUARD

8

1/4

LT1679

13

–

1/4

LT1679

12

+

U

0.1Hz to 10Hz Voltage Noise

VS = ±2.5V

VOLTAGE NOISE (50nV/DIV)

4681002
TIME (sec)

16789 TA01b

sn16789 16789fs

5

+

6

–

16789 TA01

30k1k

15V

4

1/4

LT1679

11

–15V

GAIN = 1000

7

OUTPUT

30k

1

R

F

3.4k

R

G

100Ω

10

+

R

G

100Ω

9

–

R

F

3.4k

14

1k

1

LT1678/LT1679

TOP VIEW

S PACKAGE

14-LEAD PLASTIC SO

1

2

3

4

5

6

7

14

13

12

11

10

9

8

OUT A

–IN A

+IN A

V

+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V

–

+IN C

–IN C

OUT C

AD

CB

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Supply Voltage ...................................................... ±18V

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.)................. 300°C

Operating Temperature Range

(Note 4)............................................. – 40°C to 85°C

Specified Temperature Range

(Note 5)............................................. – 40°C to 85°C

UU

W

PACKAGE/ORDER I FOR ATIO

ORDER PART

TOP VIEW

1

OUT A

2

–IN A

3

+IN A

–

4

V

8-LEAD PLASTIC SO

T

= 150°C, θJA = 190°C/ W

JMAX

A

B

S8 PACKAGE

+

8

V

7

OUT B

6

–IN B

+IN B

5

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

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) MIN TYP MAX UNITS

V

OS

∆V

OS

∆Temp
I

B

2

Input Offset Voltage (Note 11) 35 100 µV

Average Input Offset Drift (Note 10) ● 0.40 3 µV/°C

Input Bias Current (Note 11) ±2 ±20 nA

NUMBER

LT1678CS8
LT1678IS8

S8 PART MARKING

1678
1678I

The ● denotes the specifications which apply over the full operating

≤ 70°C ● 55 270 µV

0°C ≤ T

A

–40°C ≤ T

VS =5V, VCM = VS + 0.1V 150 550 µV

=5V, VCM = VS – 0.3V, 0°C ≤ TA ≤ 70°C ● 180 750 µV

V

S

=5V, VCM = VS – 0.3V, –40°C ≤ TA ≤ 85°C ● 200 1000 µV

V

S

VS =5V, VCM = –0.1V 1.5 30 mV

=5V, VCM = 0V, 0°C ≤ TA ≤ 70°C ● 1.8 45 mV

V

S

=5V, VCM = 0V, –40°C ≤ TA ≤ 85°C ● 2.0 50 mV

V

S

0°C ≤ T
–40°C ≤ T

VS = 5V, VCM = VS + 0.1V 0.19 0.40 µA

= 5V, VCM = VS – 0.3V, 0°C ≤ TA ≤ 70°C ● 0.19 0.60 µA

V

S

= 5V, VCM = VS – 0.3V, –40°C ≤ TA ≤ 85°C ● 0.25 0.75 µA

V

S

VS = 5V, VCM = –0.1V –5 –0.41 µA

= 5V, VCM = 0V, 0°C ≤ TA ≤ 70°C ● –8.4 – 0.45 µA

V

S

= 5V, VCM = 0V, –40°C ≤ TA ≤ 85°C ● –10 – 0.47 µA

V

S

≤ 85°C ● 75 350 µV

A

≤ 70°C ● ± 3 ±35 nA

A

≤ 85°C ● ± 7 ±50 nA

A

T

= 150°C, θJA = 160°C/ W

JMAX

ORDER PART

NUMBER

LT1679CS
LT1679IS

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LT1678/LT1679

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes the specifications which apply over the full operating

= 25°C. VS = 3V, VCM = VO = 1.7V; VS = 5V, VCM = VO = 2.5V unless

A

otherwise noted.

SYMBOL PARAMETER CONDITIONS (Note 6) MIN TYP MAX UNITS

I

OS

e

n

i

n

V

CM

R

IN

C

IN

CMRR Common Mode Rejection Ratio VS = 5V, VCM = 1.9V to 3.9V 98 120 dB

PSRR Power Supply Rejection Ratio VS = 2.7V to 36V, VCM = VO = 1.7V 100 125 dB

A

VOL

V

OL

Input Offset Current (Note 11) 4 25 nA

0°C ≤ TA ≤ 70°C ● 535 nA
–40°C ≤ T

≤ 85°C ● 855 nA

A

VS = 5V, VCM = VS + 0.1V 6 30 nA
V

= 5V, VCM = VS – 0.3V, 0°C ≤ TA ≤ 70°C ● 10 40 nA

S

V

= 5V, VCM = VS – 0.3V, –40°C ≤ TA ≤ 85°C ● 15 65 nA

S

VS = 5V, VCM = –0.1V 0.1 1.6 µA
V

= 5V, VCM = 0V, 0°C ≤ TA ≤ 70°C ● 0.1 2.0 µA

S

VS = 5V, VCM = 0V, –40°C ≤ TA ≤ 85°C ● 0.15 2.4 µA

Input Noise Voltage 0.1Hz to 10Hz (Note 7) 90 nV

VCM = V

S

180 nV

VCM = 0V 1600 nV

P-P
P-P
P-P

Input Noise Voltage Density (Note 8) fO = 10Hz 4.4 nV/√Hz

VCM = VS, fO = 10Hz 6.6 nV/√Hz
V

= 0V, fO = 10Hz 19 nV/√Hz

CM

fO = 1kHz 3.9 5.5 nV/√Hz
VCM = VS, fO = 1kHz 5.3 nV/√Hz
V

= 0V, fO = 1kHz 9 nV/√Hz

CM

Input Noise Current Density fO = 10Hz 1.2 pA/√Hz

fO = 1kHz 0.3 pA/√Hz

Input Voltage Range –0.1 VS + 0.1V V

● 0V

– 0.3V V

S

Input Resistance Common Mode 2 GΩ

Input Capacitance 4.2 pF

VS = 5V, VCM = 1.9V to 3.9V ● 92 120 dB

V

= 3.1V to 36V, VCM = VO = 1.7V ● 98 120 dB

S

Large-Signal Voltage Gain VS = 3V, RL = 10k, VO = 2.5V to 0.7V 0.6 3 V/µV

● 0.3 2 V/µV

VS = 3V, RL = 2k, VO = 2.2V to 0.7V 0.5 3 V/µV
0°C ≤ TA ≤ 70°C ● 0.4 0.9 V/µV
–40°C ≤ T

≤ 85°C ● 0.4 0.8 V/µV

A

VS = 3V, RL = 600Ω, VO = 2.2V to 0.7V 0.20 0.43 V/µV
0°C ≤ TA ≤ 70°C ● 0.15 0.40 V/µV
–40°C ≤ T

≤ 85°C ● 0.10 0.35 V/µV

A

VS = 5V, RL = 10k, VO = 4.5V to 0.7V 1 3.8 V/µV
O°C < T

< 70°C ● 0.6 2 V/µV

A

–40 < TA < 85°C ● 0.3 2 V/µV

VS = 5V, RL = 2k, VO = 4.2V to 0.7V 0.7 3.5 V/µV
0°C ≤ T

≤ 70°C ● 0.6 3.2 V/µV

A

–40°C ≤ TA ≤ 85°C ● 0.5 3.0 V/µV

VS = 5V, RL = 600Ω, VO = 4.2V to 0.7V 0.6 3.0 V/µV
0°C ≤ T

≤ 70°C ● 0.5 2.8 V/µV

A

–40°C ≤ TA ≤ 85°C ● 0.4 2.5 V/µV

Output Voltage Swing Low (Note 11) Above GND

I

= 0.1mA 80 170 mV

SINK

0°C ≤ T

≤ 70°C ● 125 200 mV

A

– 40°C ≤ TA ≤ 85°C ● 130 250 mV

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3

LT1678/LT1679

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes the specifications which apply over the full operating

= 25°C. VS = 3V, VCM = VO = 1.7V; VS = 5V, VCM = VO = 2.5V unless

A

otherwise noted.

SYMBOL PARAMETER CONDITIONS (Note 6) MIN TYP MAX UNITS

V

OL

V

OH

I

SC

SR Slew Rate (Note 13) AV = – 1, RL = 10k 4 6 V/µs

GBW Gain Bandwidth Product (Note 11) fO = 100kHz 13 20 MHz

t

S

R

O

I

S

∆V

OS

∆IB+ Noninverting Bias Current Match ±2 ±30 nA

∆CMRR Common Mode Rejection Match VS = 5V, VCM = 1.9V to 3.9V 94 110 dB

∆PSRR Power Supply Rejection Match VS = 2.7V to 36V, VCM = VO = 1.7V 96 120 dB

Output Voltage Swing Low (Note 11) Above GND

I

= 2.5mA 170 250 mV

SINK

0°C ≤ T
– 40°C ≤ T

≤ 70°C ● 195 320 mV

A

≤ 85°C ● 205 350 mV

A

Above GND
I

= 10mA 370 600 mV

SINK

0°C ≤ T
– 40°C ≤ T

Output Voltage Swing High (Note 11) Below V

I
0°C ≤ T
– 40°C ≤ T

Below V
I
0°C ≤ T
– 40°C ≤ T

Below V
I
0°C ≤ T
– 40°C ≤ T

≤ 70°C ● 440 720 mV

A

≤ 85°C ● 465 770 mV

A

S

= 0.1mA 75 150 mV

SOURCE

≤ 70°C ● 85 200 mV

A

≤ 85°C ● 93 250 mV

A

S

= 2.5mA 110 250 mV

SOURCE

≤ 70°C ● 195 350 mV

A

≤ 85°C ● 205 375 mV

A

S

= 10mA 170 400 mV

SOURCE

≤ 70°C ● 200 500 mV

A

≤ 85°C ● 230 550 mV

A

Output Short-Circuit Current (Note 3) VS = 3V 15 22 mA

● 13 19 mA

VS = 5V 18 29 mA

● 14 25 mA

= 10k, 0°C ≤ TA ≤ 70°C ● 3.5 5.8 V/µs

R

L

= 10k, –40°C ≤ TA ≤ 85°C ● 3 5.5 V/µs

R

L

= 100kHz ● 12.5 19 MHz

f

O

Settling Time 2V Step 0.1%, AV = +1 1.4 µs

Open-Loop Output Resistance I
Closed-Loop Output Resistance A

2V Step 0.01%, A

= 0 100 Ω

OUT

= 100, f = 10kHz 1 Ω

V

= +1 2.4 µs

V

Supply Current per Amplifier (Note 12) 2 3.4 mA

● 2.5 3.8 mA

Offset Voltage Match 35 150 µV
(Notes 11, 15) 0°C ≤ T

(Notes 11, 15) 0°C ≤ T

(Notes 11, 14, 15)

(Notes 11, 14, 15) V

≤ 70°C ● 55 400 µV

A

–40°C ≤ T

–40°C ≤ T

S

≤ 85°C ● 75 525 µV

A

≤ 70°C ● ±3 ±55 nA

A

≤ 85°C ● ±7 ±75 nA

A

● 88 110 dB

= 3.1V to 36V, VCM = VO = 1.7V ● 94 120 dB

4

sn16789 16789fs

LT1678/LT1679

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes the specifications which apply over the full operating

= 25°C. VS = ±15V, VCM = VO = 0V unless otherwise noted.

A

SYMBOL PARAMETER CONDITIONS (Note 6) MIN TYP MAX UNITS

V

∆V

OS

OS

Input Offset Voltage 20 150 µV

0°C ≤ T

≤ 70°C ● 30 350 µV

A

–40°C ≤ T

≤ 85°C ● 45 420 µV

A

Average Input Offset Drift (Note 10) ● 0.40 3 µV/°C

∆Temp
I

B

I

OS

e

n

Input Bias Current ±2 ±20 nA

0°C ≤ T

≤ 70°C ● ±3 ±35 nA

A

–40°C ≤ T

≤ 85°C ● ±7 ±50 nA

A

Input Offset Current 325 nA

≤ 70°C ● 535 nA

0°C ≤ T

A

–40°C ≤ T

Input Noise Voltage 0.1Hz to 10Hz (Note 7) 90 nV

≤ 85°C ● 855 nA

A

VCM = 15V 180 nV
VCM = –15V 1600 nV

P-P
P-P
P-P

Input Noise Voltage Density fO = 10Hz 4.4 nV/√Hz

= 15V, fO = 10Hz 6.6 nV/√Hz

V

CM

V

= –15V, fO = 10Hz 19 nV/√Hz

CM

fO = 1kHz 3.9 5.5 nV/√Hz

= 15V, fO = 1kHz 5.3 nV/√Hz

V

CM

= –15V, fO = 1kHz 9 nV/√Hz

V

CM

i

n

V

CM

R

IN

C

IN

Input Noise Current Density fO = 10Hz 1.2 pA/√Hz

f

= 1kHz 0.3 pA/√Hz

O

Input Voltage Range (Note 16) ● – 13.3 14 V

Input Resistance Common Mode 2 GΩ

Input Capacitance 4.2 pF

CMRR Common Mode Rejection Ratio VCM = –13.3V to 14V 100 130 dB

● 96 124 dB

PSRR Power Supply Rejection Ratio VS = ±1.7V to ±18V 106 130 dB

● 100 125 dB

A

VOL

Large-Signal Voltage Gain RL = 10k, VO = ±14V 3 7 V/µV

≤ 70°C ● 26 V/µV

0°C ≤ T

A

–40°C ≤ T

≤ 85°C ● 14 V/µV

A

RL = 2k, VO = ±13.5V 0.8 1.7 V/µV
0°C ≤ T

≤ 70°C ● 0.5 1.4 V/µV

A

–40°C ≤ T

≤ 85°C ● 0.4 1.1 V/µV

A

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5