ANALOG DEVICES LT 1490 ACS8 Datasheet

FEATURES

■

Rail-to-Rail Input and Output

■

Single Supply Input Range: –0.4V to 44V

■

Micropower: 50

■

MSOP Package

■

Specified on 3V, 5V and ±15V Supplies

■

High Output Current: 20mA

■

Output Drives 10,000pF with Output Compensation

■

Reverse Battery Protection to 18V

■

No Supply Sequencing Problems

■

High Voltage Gain: 1500V/mV

■

High CMRR: 98dB

■

No Phase Reversal

■

Gain Bandwidth Product: 200kHz

µµ

µA/Amplifier Max

µµ

U

APPLICATIO S

■

Battery- or Solar-Powered Systems

Portable Instrumentation
Sensor Conditioning

■

Supply Current Sensing

■

Battery Monitoring

■

Micropower Active Filters

■

4mA to 20mA Transmitters

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

LT1490/LT1491

Dual and Quad

Micropower Rail-to-Rail

Input and Output Op Amps

U

DESCRIPTIO

The dual LT®1490 and quad LT1491 op amps operate on all
single and split supplies with a total voltage of 2V to 44V
drawing only 40µA of quiescent current per amplifier. These
amplifiers are reverse supply protected; they draw no current
for reverse supply up to 18V. The input range of the LT1490/
LT1491 includes both supplies and the output swings to both
supplies. Unlike most micropower op amps, the LT1490/
LT1491 can drive heavy loads; their rail-to-rail outputs drive
20mA. The LT1490/LT1491 are unity-gain stable and drive all
capacitive loads up to 10,000pF when optional 0.22µF and
150Ω compensation is used.

The LT1490/LT1491 have a unique input stage that oper­ates and remains high impedance when above the positive
supply. The inputs take 44V both differential and common
mode even when operating on a 3V supply. Built-in resis­tors protect the inputs for faults below the negative supply
up to 22V. There is no phase reversal of the output for inputs
22V below V– or 44V above V–, independent of V+.

The LT1490 dual op amp is available in the 8-pin MSOP,
SO and PDIP packages. The quad LT1491 is available in
the 14-pin SO and PDIP packages.

For new designs it is recommended that the LT1490A/
LT1491A be used instead of the LT1490/LT1491. See the
LT1490A/LT1491A data sheet for details.

TYPICAL APPLICATIO

CHARGER

VOLTAGE

U

R

R

S

0.2Ω

I

BATT

LOAD

I

= = AMPS

BATT

(RS)(RG/RA)(GAIN)

A

2k

R

A

'

2k

R

B

2k

R

B

'

2k

+

= 12V

V

BATT

V

OUT

Battery Monitor

+

A

1/4 LT1491

–

+

B

1/4 LT1491

–

V

OUT

GAIN

Q1

2N3904

Q2

2N3904

S1

S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10

R
10k

–

C

1/4 LT1491

+

LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING

+

G

10k

D

1/4 LT1491

–

90.9k

= R

R

A

VS = 5V, 0V

B

LOGIC

V

OUT

1490/91 TA01

1

LT1490/LT1491

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Total Supply Voltage (V+ to V–) .............................. 44V

Input Differential Voltage ......................................... 44V

Input Current ......................................................±25mA

Output Short-Circuit Duration (Note 2).........Continuous

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

U

W

U

PACKAGE/ORDER INFORMATION

ORDER PART

TOP VIEW

+

1

OUT A

2

–IN A
+IN A

MS8 PACKAGE

8-LEAD MSOP

T
T
T

A

3

–

4

V

S8 PACKAGE

8-LEAD PLASTIC SO

= 150°C, θJA = 250°C/ W (MS8)

JMAX

= 150°C, θJA = 130°C/ W (N8)

JMAX

= 150°C, θJA = 190°C/ W (S8)

JMAX

8

V

7

OUT B

6

–IN B

B

5

+IN B

N8 PACKAGE
8-LEAD PDIP

Consult factory for Military grade parts.

NUMBER

LT1490CMS8
LT1490CN8
LT1490CS8
LT1490IN8
LT1490IS8

MS8 PART MARKING

LTBB

S8 PART MARKING

1490 1490I

Junction Temperature...........................................150°C

Specified Temperature Range (Note 3) .. –40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec)..................300°C

(For new designs, use the LT1490A or LT1491A)

TOP VIEW

OUT A

1

–IN A

2

+IN A

+IN B
–IN B

OUT B

N PACKAGE

14-LEAD PDIP

A

3

+

V

4
5

B

6
7

T

= 150°C, θJA = 110°C/ W (N)

JMAX

T

= 150°C, θJA = 150°C/ W (S)

JMAX

OUT D

14

–IN D

13

D

+IN D

12

–

V

11

+IN C

10

C

– IN C

9

OUT C

8

S PACKAGE

14-LEAD PLASTIC SO

ORDER PART

NUMBER

LT1491CN
LT1491CS
LT1491IN
LT1491IS

ELECTRICAL CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = V

The ● denotes specifications which apply over the full operating temperature

= half supply, unless otherwise noted. (Note 3)

OUT

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

Input Offset Voltage LT1490 N Package 220 800 µV

0°C ≤ T

≤ 70°C ● 1000 µV

A

–40°C ≤ TA ≤ 85°C ● 1100 µV
LT1490 S Package 220 950 µV

0°C ≤ TA ≤ 70°C ● 1200 µV
–40°C ≤ T

≤ 85°C ● 1300 µV

A

LT1491 N Package 300 1100 µV
0°C ≤ T

≤ 70°C ● 1350 µV

A

–40°C ≤ TA ≤ 85°C ● 1450 µV
LT1490CMS8 Package, LT1491 S Package 350 1450 µV

0°C ≤ TA ≤ 70°C ● 1650 µV
–40°C ≤ T

≤ 85°C ● 1750 µV

A

VOS TC Input Offset Voltage Drift 0°C ≤ TA ≤ 70°C (Note 7) ● 24 µV/°C

–40°C ≤ TA ≤ 85°C (Note 7) ● 24 µV/°C

I

OS

Input Offset Current ● 0.2 0.8 nA

VCM = 44V (Note 4) ● 0.8 µA

I

B

Input Bias Current ● 48 nA

VCM = 44V (Note 4) ● 410 µA
V

= 0V 0.1 nA

S

Input Noise Voltage 0.1Hz to 10Hz 1 µV

P-P

2

LT1490/LT1491

ELECTRICAL CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = V

The ● denotes specifications which apply over the full operating temperature

= half supply, unless otherwise noted. (Note 3)

OUT

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

e

n

i

n

R

IN

Input Noise Voltage Density f = 1kHz 50 nV/√Hz
Input Noise Current Density f = 1kHz 0.03 pA/√Hz
Input Resistance Differential 6 17 MΩ

Common Mode, VCM = 0V to 44V 4 11 MΩ

C

IN

Input Capacitance 4.6 pF
Input Voltage Range ● 044V

CMRR Common Mode Rejection Ratio V

(Note 4) V

A

VOL

Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k 200 1500 V/mV

= 0V to VCC – 1V ● 84 98 dB

CM

= 0V to 44V ● 80 98 dB

CM

0°C ≤ TA ≤ 70°C ● 133 V/mV
–40°C ≤ T

≤ 85°C ● 100 V/mV

A

VS = 5V, VO = 500mV to 4.5V, RL = 10k 400 1500 V/mV
0°C ≤ T

≤ 70°C ● 250 V/mV

A

–40°C ≤ TA ≤ 85°C ● 200 V/mV

V

OL

Output Voltage Swing Low VS = 3V, No Load ● 22 50 mV

VS = 3V, I

= 5mA ● 250 450 mV

SINK

VS = 5V, No Load ● 22 50 mV
VS = 5V, I
V

= 5V, I

S

V

OH

Output Voltage Swing High VS = 3V, No Load ● 2.95 2.978 V

V

= 3V, I

S

= 5mA ● 250 500 mV

SINK

= 10mA 330 500 mV

SINK

= 5mA ● 2.55 2.6 V

SOURCE

VS = 5V, No Load ● 4.95 4.978 V
VS = 5V, I

I

SC

Short-Circuit Current (Note 2) VS = 3V, Short to GND 10 15 mA

VS = 3V, Short to V

= 10mA ● 4.30 4.6 V

SOURCE

CC

10 30 mA

VS = 5V, Short to GND 15 25 mA
VS = 5V, Short to V

CC

PSRR Power Supply Rejection Ratio VS = 2.5V to 12.5V, V

= VO = 1V ● 84 98 dB

CM

15 30 mA

Minimum Operating Supply Voltage ● 2 2.5 V
Reverse Supply Voltage IS = –100µA per Amplifier ● 18 27 V

I

S

Supply Current per Amplifier 40 50 µA
(Note 5)

● 55 µA

GBW Gain Bandwidth Product f = 1kHz 110 180 kHz

(Note 4) 0°C ≤ T

≤ 70°C ● 100 kHz

A

–40°C ≤ TA ≤ 85°C ● 90 kHz

SR Slew Rate AV = –1, RL = ∞ 0.035 0.06 V/µs

(Note 6) 0°C ≤ TA ≤ 70°C ● 0.031 V/µs

–40°C ≤ TA ≤ 85°C ● 0.030 V/µs

3

LT1490/LT1491

ELECTRICAL CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, V

The ● denotes specifications which apply over the full operating temperature

= 0V, unless otherwise noted. (Note 3)

OUT

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

Input Offset Voltage LT1490 N, S Package 250 1200 µV

≤ 70°C ● 1400 µV

0°C ≤ T

A

–40°C ≤ T

≤ 85°C ● 1500 µV

A

LT1491 N Package 350 1250 µV
0°C ≤ T

≤ 70°C ● 1500 µV

A

–40°C ≤ T

≤ 85°C ● 1600 µV

A

LT1490CMS8 Package, LT1491 S Package 400 1600 µV
0°C ≤ T

≤ 70°C ● 1850 µV

A

–40°C ≤ T

≤ 85°C ● 1950 µV

A

VOS TC Input Offset Voltage Drift 0°C ≤ TA ≤ 70°C (Note 7) ● 36 µV/°C

–40°C ≤ T

I

OS

I

B

Input Offset Current ● 0.2 0.8 nA
Input Bias Current ● 48 nA
Input Noise Voltage 0.1Hz to 10Hz 1 µV

e

n

i

n

R

IN

Input Noise Voltage Density f = 1kHz 50 nV/√Hz
Input Noise Current Density f = 1kHz 0.03 pA/√Hz
Input Resistance Differential 6 17 MΩ

Common Mode, V

C

IN

Input Capacitance 4.6 pF

≤ 85°C (Note 7) ● 36 µV/°C

A

= –15V to 14V 15000 MΩ

CM

P-P

Input Voltage Range ● –15 29 V

CMRR Common Mode Rejection Ratio V
A

VOL

V

O

I

SC

Large-Signal Voltage Gain VO = ±14V, RL = 10k 100 250 V/mV

Output Voltage Swing No Load ● ±14.9 ±14.978 V

Short-Circuit Current (Note 2) Short to GND ±20 ±25 mA

= –15V to 29V ● 80 98 dB

CM

≤ 70°C ● 75 V/mV

0°C ≤ T

A

–40°C ≤ T

I

OUT

I

OUT

0°C ≤ T
–40°C ≤ T

≤ 85°C ● 50 V/mV

A

= ±5mA ● ±14.5 ±14.750 V
= ±10mA ±14.5 ±14.670 V

≤ 70°C ● ±15 mA

A

≤ 85°C ● ±10 mA

A

PSRR Power Supply Rejection Ratio VS = ±1.25V to ±22V ● 88 98 dB
I

S

Supply Current per Amplifier 50 70 µA

● 85 µA

GBW Gain Bandwidth Product f = 1kHz 125 200 kHz

≤ 70°C ● 110 kHz

0°C ≤ T

A

–40°C ≤ T

≤ 85°C ● 100 kHz

A

SR Slew Rate AV = –1, RL = ∞, VO = ±10V, 0.0375 0.07 V/µs

Measure at V
0°C ≤ T

= ±5V

O

≤ 70°C ● 0.0330 V/µs

A

–40°C ≤ TA ≤ 85°C ● 0.0300 V/µs

Note 1: Absolute Maximum Ratings are those values beyond which the
life of the device may be impaired.

Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply voltage
and how many amplifiers are shorted.

Note 3: The LT1490C/LT1491C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1490C/LT1491C are designed,
characterized and expected to meet specified performance from –40°C
to 85°C but are not tested or QA sampled at these temperatures.

4

The LT1490I/LT1491I are guaranteed to meet specified performance from
–40°C to 85°C.

Note 4: V
V

S

Note 5: V
V

S

Note 6: Guaranteed by correlation to slew rate at V
at V

= 5V limits are guaranteed by correlation to VS = 3V and

S

= ±15V tests.

= 3V limits are guaranteed by correlation to VS = 5V and

S

= ±15V tests.

= 3V and VS = ±15V tests.

S

= ±15V and GBW

S

Note 7: This parameter is not 100% tested.