LINEAR TECHNOLOGY LT1797 Technical data

查询LT1797供应商

FEATURES

■

Rail-to-Rail Input and Output

■

Small SOT-23 Package

■

Gain Bandwidth Product: 10MHz

■

–40°C to 85°C Operation

■

Slew Rate: 2.25V/µs

■

Low Input Offset Voltage: 1.5mV Max

■

High Output Current: 25mA Min

■

Specified on 3V, 5V and ±5V Supplies

■

High Voltage Gain: 1000V/mV 10k Load

■

High CMRR: 88dB Min

■

High PSRR: 80dB Min

■

Input Bias Current: 300nA Max

■

Input Offset Current: 25nA Max

U

APPLICATIO S

■

Portable Instrumentation

■

Rail-to-Rail Buffer Amplifiers

■

Low Voltage Signal Processing

■

Driving A/D Converters

■

Battery-Powered Systems

LT1797

10MHz, Rail-to-Rail

Input and Output

Op Amp in SOT-23

U

DESCRIPTIO

The LT®1797 is a unity-gain stable 10MHz op amp avail­able in the small SOT-23 package that operates on all
single and split supplies with a total voltage of 2.7V to 12V.
The amplifier draws 1mA of quiescent current and has a
slew rate of 2.25V/µs.

The input common mode range of the LT1797 includes
both rails, making it ideal for current sensing applications.
The input stage incorporates phase reversal protection to
prevent false outputs from occurring when the inputs are
driven beyond the supplies. Protective resistors are in­cluded in the input leads so that current does not become
excessive when the inputs are forced above or below the
supplies.

The output of the LT1797 can swing to within 50mV of V
and 8mV of V– without drawing excess current in either
condition. The amplifier can drive loads up to 25mA and
still maintain rail-to-rail capability.

The LT1797 op amp is available in the space saving 5-lead
SOT-23 package.

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

+

TYPICAL APPLICATION

3.3k

0805

×3

BZX84C6V8

V

= 6.8V

Z

–48V SUPPLY

(–42V TO –56V)

U

Fast Compact –48V Current Sense

FMMT493

30.1Ω

1%

0.003Ω
1% 3W

I

SENSE

–

LT1797

+

0.1µF

–48V LOAD

+–

1797 TA01

= 3V – 0.1Ω • I

V

OUT

I

= 0A TO 30A

SENSE

ACCURACY ≈ 3%

V

OUT

Q1

R1

4.7k

R1 REDUCES Q1 DISSIPATION

SETTLES TO 1% IN 2µs,
1V OUTPUT STEP

1%

SENSE

1k

V

= 3V

S

1

LT1797

WWWU

ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

UU

W

(Note 1)

Total Supply Voltage (V+ to V–) ........................... 12.6V

Input Differential Voltage ..................................... 12.6V

Input Current ..................................................... ±10mA

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

Operating Temperature Range

(Note 3)

Specified Temperature Range.................

............................................. – 40°C to 85°C

–40°C to 85°C

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

TOP VIEW

1

OUT

–

2

+IN

V

T

JMAX

+

3

S5 PACKAGE

5-LEAD PLASTIC SOT-23

= 150°C, θJA = 250°C/W

+

5

V

–

–IN

4

ORDER PART

NUMBER

LT1797CS5
LT1797IS5

S5 PART MARKING

LTLM
LTTL

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

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

Consult factory for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V, VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

e

n

i

n

R

IN

C

IN

CMRR Common Mode Rejection Ratio VCM = 0V to VS – 1.2V ● 88 96 dB

A

VOL

Input Offset Voltage 1 1.5 mV

Input Offset Voltage Drift (Note 4) ● 520µV/°C
Input Bias Current VCM = V

Input Bias Current Drift ● 0.1 nA/°C
Input Offset Current VCM = V

Input Noise Voltage 0.1Hz to 10Hz 1.5 µV
Input Noise Voltage Density f = 10kHz 20 nV/√Hz
Input Noise Current Density f = 10kHz 0.23 pA/√Hz

Input Resistance Differential 200 330 kΩ

Input Capacitance 4pF

Input Voltage Range ● 0V
Large-Signal Voltage Gain VS = 3V, VO = 0.5V to 2.5V, RL = 10k 200 1000 V/mV

= half supply, pulse power tested, unless otherwise specified. (Note 3)

OUT

≤ 70°C ● 2.5 mV

0°C ≤ T

A

–40°C ≤ T

V

CM

V

CM

f = 10kHz, V

Common Mode, V

V

CM

VS = 5V, VO = 0.5V to 4.5V, RL = 10k 400 1000 V/mV

≤ 85°C ● 3.0 mV

A

–
+

= V

–
+

= V

CM

= 0V to V

= VCC – 0.3V 0.15 pA/√Hz

= 0V to VS – 1.2V 100 MΩ

CM

S

● –300 –150 nA

● 50 100 nA

● 10 25 nA

● 10 25 nA

● 64 72 dB

● 150 V/mV

● 300 V/mV

P-P

S

V

2

LT1797

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V, VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

PSRR Power Supply Rejection Ratio VS = 2.7V to 12V, VCM = VO= 1V ● 80 90 dB

Minimum Supply Voltage ● 2.5 2.7 V

V

OL

V

OH

I

SC

I

S

GBW Gain Bandwidth Product (Note 5) f = 100kHz 6.0 10 MHz

SR Slew Rate (Note 5) AV = –1 1.3 2.25 V/µs

t

r

t

f

t

S

THD Distortion VS = 3V, V
FPBW Full-Power Bandwidth (Note 6) V

Output Voltage Swing LOW No Load, Input Overdrive = 30mV ● 815 mV

Output Voltage Swing HIGH No Load, Input Overdrive = 30mV ● VS – 0.14 VS – 0.05 V

Short-Circuit Current VS = 5V 25 45 mA

Supply Current 1.1 1.5 mA

Output Rise Time 10% to 90%, 0.1V Step, RL = 10k 55 ns
Output Fall Time 10% to 90%, 0.1V Step, RL = 10k 55 ns
Settling Time VS = 5V, ∆V

= half supply, pulse power tested, unless otherwise specified. (Note 3)

OUT

I

= 5mA ● 80 160 mV

SINK

= 10mA ● 150 250 mV

I

SINK

= 5mA ● VS – 0.30 VS – 0.2 V

I

SOURCE

= 10mA ● VS – 0.39 VS – 0.3 V

I

SOURCE

V

= 3V 15 25 mA

S

● 2.0 mA

≤ 70°C ● 5.0 MHz

0°C ≤ T

A

–40°C ≤ T

0°C ≤ T
–40°C ≤ T

OUT

≤ 85°C ● 4.5 MHz

A

≤ 70°C ● 1.1 V/µs

A

≤ 85°C ● 1.0 V/µs

A

= 2V to 0.1%, AV = –1 1.6 µs

OUT

= 2V

OUT

P-P

= 1.8V

, AV = 1, RL = 10k, f = 1kHz 0.001 %

P-P

360 kHz

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = ±5V, VCM = 0V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

e

n

i

n

R

IN

C

IN

Input Offset Voltage 1 1.5 mV

Input Offset Voltage Drift (Note 4) ● 520µV/°C
Input Bias Current VCM = V

Input Bias Current Drift ● 0.1 nA/°C
Input Offset Current VCM = V

Input Noise Voltage 0.1Hz to 10Hz 1 µV
Input Noise Voltage Density f = 10kHz 20 nV/√Hz
Input Noise Current Density f = 10kHz 0.23 pA/√Hz

Input Resistance Differential 200 330 kΩ

Input Capacitance 4pF
Input Voltage Range ● –5 5 V

= 0V, pulse power tested unless otherwise specified. (Note 3)

OUT

≤ 70°C ● 2.5 mV

0°C ≤ T

A

–40°C ≤ T

V

CM

V

CM

f = 10kHz, V

Common Mode, V

≤ 85°C ● 3.0 mV

A

–
+

= V

–
+

= V

= 4.7V 0.15 pA/√Hz

CM

= –5V to 3.8V 100 MΩ

CM

● –300 –150 nA

● 50 100 nA

● 10 25 nA

● 10 25 nA

P-P

3

LT1797

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = ±5V, VCM = 0V,V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

CMRR Common Mode Rejection Ratio VCM = –5V to 3.8V ● 83 96 dB

A

VOL

V

OL

V

OH

I

SC

PSRR Power Supply Rejection Ratio VS = ±1.35V to ±6V ● 80 90 dB
I

S

GBW Gain Bandwidth Product f = 100kHz 6.5 11 MHz

SR Slew Rate AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 1.50 2.50 V/µs

t

r

t

f

t

S

FPBW Full-Power Bandwidth (Note 6) V
Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.
Note 2: A heat sink may be required to keep the junction temperature

below absolute maximum.
Note 3: The LT1797C is guaranteed to meet 0°C to 70°C specifications

and is designed, characterized and expected to meet the extended
temperature limits, but is not tested at –40°C and 85°C. The LT1797I is
guaranteed to meet specified performance from –40°C to 85°C.

Large-Signal Voltage Gain VO = ±4V, RL = 10k 400 1000 V/mV

Output Voltage Swing LOW No Load, Input Overdrive = 30mV ● –4.99 – 4.98 V

Output Voltage Swing HIGH No Load, Input Overdrive = 30mV ● 4.84 4.95 V

Short-Circuit Current (Note 2) Short to GND 30 50 mA

Supply Current 1.40 2.25 mA

Output Rise Time 10% to 90%, 0.1V Step, RL = 10k 55 ns
Output Fall Time 10% to 90%, 0.1V Step, RL = 10k 55 ns
Settling Time ∆V

= 0V, pulse power tested unless otherwise specified. (Note 3)

OUT

= –5V to 5V ● 66 76 dB

V

CM

I

= 5mA ● –4.92 –4.87 V

SINK

= 10mA ● –4.85 –4.79 V

I

SINK

= 5mA ● 4.70 4.80 V

I

SOURCE

I

= 10mA ● 4.61 4.70 V

SOURCE

0°C ≤ T

≤ 70°C ● 5.5 MHz

A

–40°C ≤ T

0°C ≤ T
–40°C ≤ T

OUT

≤ 85°C ● 5.0 MHz

A

≤ 70°C ● 1.25 V/µs

A

≤ 85°C ● 1.10 V/µs

A

= 4V to 0.1%, AV = 1 2.6 µs

OUT

= 8V

P-P

Note 4: This parameter is not 100% tested.
Note 5: V

= 3V limit guaranteed by correlation to 5V tests.

S

Note 6: Full-power bandwidth is calculated from the slew rate:
FPBW = SR/2πV

● 300 V/mV

● 2.70 mA

100 kHz

P

4