Datasheet LT1358, LT1359 Datasheet (Linear Technology)

FEATURES

■

25MHz Gain Bandwidth

■

600V/µs Slew Rate

■

2.5mA Maximum Supply Current per Amplifier

■

Unity-Gain Stable

■

C-LoadTM Op Amp Drives All Capacitive Loads

■

8nV/√Hz Input Noise Voltage

■

600µV Maximum Input Offset Voltage

■

500nA Maximum Input Bias Current

■

120nA Maximum Input Offset Current

■

20V/mV Minimum DC Gain, RL=1k

■

115ns Settling Time to 0.1%, 10V Step

■

220ns Settling Time to 0.01%, 10V Step

■

±12.5V Minimum Output Swing into 500Ω

■

±3V Minimum Output Swing into 150Ω

■

Specified at ±2.5V, ±5V, and ±15V

U

APPLICATIO S

■

Wideband Amplifiers

■

Buffers

■

Active Filters

■

Data Acquisition Systems

■

Photodiode Amplifiers

LT1358/LT1359

Dual and Quad

25MHz, 600V/µs Op Amps

U

DESCRIPTIO

The LT1358/LT1359 are dual and quad low power high
speed operational amplifiers with outstanding AC and DC
performance. The amplifiers feature much lower supply
current and higher slew rate than devices with comparable
bandwidth. The circuit topology is a voltage feedback
amplifier with matched high impedance inputs and the
slewing performance of a current feedback amplifier. The
high slew rate and single stage design provide excellent
settling characteristics which make the circuit an ideal
choice for data acquisition systems. Each output drives a
500Ω load to ±12.5V with ±15V supplies and a 150Ω load
to ±3V on ±5V supplies. The amplifiers are stable with any
capacitive load making them useful in buffer applications.

The LT1358/LT1359 are members of a family of fast, high
performance amplifiers using this unique topology and
employing Linear Technology Corporation’s advanced
bipolar complementary processing. For a single amplifier
version of the LT1358/LT1359 see the LT1357 data sheet.
For higher bandwidth devices with higher supply currents
see the LT1360 through LT1365 data sheets. For lower
supply current amplifiers see the LT1354 and LT1355/
LT1356 data sheets. Singles, duals, and quads of each
amplifier are available.

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

C-Load is a trademark of Linear Technology Corporation

TYPICAL APPLICATIO

DAC I-to-V Converter

6pF

DAC

INPUTS

12

5k

565A-TYPE

0.1µF5k

U

–

1/2

LT1358

+

VIk

+

()

OS OS

V

+<51Ω

A

OUT
VOL

1358/1359 TA01

V

LSB

AV = –1 Large-Signal Response

OUT

1358/1359 TA02

1

LT1358/LT1359

8
7
6
54

3

2

1
–IN A
+IN A

V

+

TOP VIEW

N8 PACKAGE
8-LEAD PDIP

OUT A

OUT B

V

–

–IN B
+IN B

A

B

WW

W

ABSOLUTE MAXIMUM RATINGS

U

(Note 1)

Total Supply Voltage (V+ to V–) ............................... 36V

Differential Input Voltage

(Transient Only) (Note 2)................................... ±10V

Input Voltage ............................................................±V

Output Short-Circuit Duration (Note 3)............ Indefinite

U

W

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

LT1358CN8

= 150°C, θJA = 130°C/ W

JMAX

TOP VIEW

OUT A

1
2

–IN A
+IN A

V
+IN B
–IN B

OUT B OUT C

A

3

+

4
5

B

6

N PACKAGE

14-LEAD PDIP

= 150°C, θJA = 110°C/ W

JMAX

14

OUT D

13

D

C

–IN D
+IN D

12

–

V

11
10

+IN C

9

–IN C

87

Consult factory for Industrial and Military grade parts.

ORDER PART

NUMBER

Operating Temperature Range (Note 7) ...–40°C to 85°C

Specified Temperature Range (Note 8)....–40°C to 85°C

Maximum Junction Temperature (See Below)

S

Plastic Package ................................................150°C

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

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

U

TOP VIEW

+

1

OUT A

2

–IN A

+IN A

–

V

OUT A

–IN A
+IN A

+

V
+IN B
–IN B

OUT B OUT C

A

3

S8 PACKAGE

8-LEAD PLASTIC SO

T

= 150°C, θJA = 190°C/WT

JMAX

TOP VIEW

1
2

A

3
4
5

B

6

S PACKAGE

16-LEAD PLASTIC SO

T

= 150°C, θJA = 150°C/WT

JMAX

8

V

7

OUT B

6

–IN B

B

+IN B

54

16

OUT D

15

–IN D

D

+IN D

14

–

13

V

12

+IN C

C

11

–IN C

107

98NC NC

ORDER PART

NUMBER

LT1358CS8

S8 PART MARKING

1358

ORDER PART

NUMBER

LT1359CSLT1359CN

T

ELECTRICAL CHARACTERISTICS

= 25°C, V

A

SYMBOL PARAMETER CONDITIONS V

V

OS

Input Offset Voltage ±15V 0.2 0.6 mV

= 0V unless otherwise noted.

CM

SUPPLY

MIN TYP MAX UNITS

±5V 0.2 0.6 mV
±2.5V 0.3 0.8 mV

I

OS

I

B

e

n

i

n

R

IN

Input Offset Current ±2.5V to ±15V 40 120 nA
Input Bias Current ±2.5V to ±15V 120 500 nA
Input Noise Voltage f = 10kHz ±2.5V to ±15V 8 nV/√Hz
Input Noise Current f = 10kHz ±2.5V to ±15V 0.8 pA/√Hz
Input Resistance V

= ±12V ±15V 35 80 MΩ

CM

Input Resistance Differential ±15V 6 MΩ

C

IN

2

Input Capacitance ±15V 3 pF

ELECTRICAL CHARACTERISTICS

T

= 25°C, V

A

= 0V unless otherwise noted.

CM

LT1358/LT1359

SYMBOL PARAMETER CONDITIONS V

Input Voltage Range

+

SUPPLY

±15V 12.0 13.4 V

MIN TYP MAX UNITS

±5V 2.5 3.5 V
±2.5V 0.5 1.1 V

Input Voltage Range

–

±15V –13.2 –12.0 V
±5V –3.3 –2.5 V
±2.5V –0.9 –0.5 V

CMRR Common Mode Rejection Ratio V

= ±12V ±15V 83 97 dB

CM

V

= ±2.5V ±5V 78 84 dB

CM

V

= ±0.5V ±2.5V 68 75 dB

CM

PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 92 106 dB
A

V

I

OUT

I

SC

VOL

OUT

Large-Signal Voltage Gain V

= ±12V, RL = 1k ±15V 20 65 V/mV

OUT

V

= ±10V, RL = 500Ω±15V 7 25 V/mV

OUT

V

= ±2.5V, RL = 1k ±5V 20 45 V/mV

OUT

V

= ±2.5V, RL = 500Ω±5V 7 25 V/mV

OUT

V

= ±2.5V, RL = 150Ω±5V 1.5 6 V/mV

OUT

V

= ±1V, RL = 500Ω±2.5V 7 30 V/mV

OUT

Output Swing RL = 1k, V

RL = 500Ω, V
R

= 500Ω, V

L

RL = 150Ω, V
RL = 500Ω, V

Output Current V

Short-Circuit Current V

= ±12.5V ±15V 25 30 mA

OUT

V

= ±3V ±5V 20 25 mA

OUT

= 0V, V

OUT

= ±40mV ±15V 13.3 13.8 ±V

IN

= ±40mV ±15V 12.5 13.0 ±V

IN

= ±40mV ±5V 3.5 4.0 ±V

IN

= ±40mV ±5V 3.0 3.3 ±V

IN

= ±40mV ±2.5V 1.3 1.7 ±V

IN

= ±3V ±15V 30 42 mA

IN

SR Slew Rate AV = –2, (Note 4) ±15V 300 600 V/µs

±5V 150 220 V/µs

Full Power Bandwidth 10V Peak, (Note 5) ±15V 9.6 MHz

3V Peak, (Note 5) ±5V 11.7 MHz

GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V 18 25 MHz

±5V 15 22 MHz
±2.5V 20 MHz

tr, t

f

Rise Time, Fall Time AV = 1, 10%-90%, 0.1V ±15V 8 ns

±5V 9 ns

Overshoot AV = 1, 0.1V ±15V 27 %

±5V 27 %

Propagation Delay 50% VIN to 50% V

, 0.1V ±15V 9 ns

OUT

±5V 11 ns

t

s

Settling Time 10V Step, 0.1%, AV = –1 ±15V 115 ns

10V Step, 0.01%, AV = –1 ±15V 220 ns
5V Step, 0.1%, A

= –1 ±5V 110 ns

V

5V Step, 0.01%, AV = –1 ±5V 380 ns

Differential Gain f = 3.58MHz, AV = 2, RL = 1k ±15V 0.1 %

±5V 0.1 %

Differential Phase f = 3.58MHz, AV = 2, RL = 1k ±15V 0.50 Deg

±5V 0.35 Deg

R

O

I

S

Output Resistance AV = 1, f = 100kHz ±15V 0.3 Ω
Channel Separation V

= ±10V, RL = 500Ω±15V 100 113 dB

OUT

Supply Current Each Amplifier ±15V 2.0 2.5 mA

Each Amplifier ±5V 1.9 2.4 mA

3

LT1358/LT1359

ELECTRICAL CHARACTERISTICS

0°C ≤ TA ≤ 70°C, V

SYMBOL PARAMETER CONDITIONS V

V

OS

Input Offset Voltage ±15V ● 0.8 mV

= 0V unless otherwise noted.

CM

The ● denotes the specifications which apply over the temperature range

SUPPLY

±5V
±2.5V

MIN TYP MAX UNITS

● 0.8 mV

● 1.0 mV

Input VOS Drift (Note 6) ±2.5V to ±15V ● 58 µV/°C

I

OS

I

B

CMRR Common Mode Rejection Ratio V

Input Offset Current ±2.5V to ±15V ● 180 nA
Input Bias Current ±2.5V to ±15V ● 750 nA

= ±12V ±15V ● 81 dB

CM

= ±2.5V ±5V ● 77 dB

V

CM

= ±0.5V ±2.5V ● 67 dB

V

CM

PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V ● 90 dB
A

V

I

OUT

I

SC

VOL

OUT

Large-Signal Voltage Gain V

= ±12V, RL = 1k ±15V ● 15 V/mV

OUT

= ±10V, RL = 500Ω±15V ● 5V/mV

V

OUT

= ±2.5V, RL = 1k ±5V ● 15 V/mV

V

OUT

V

= ±2.5V, RL = 500Ω±5V ● 5V/mV

OUT

= ±2.5V, RL = 150Ω±5V ● 1V/mV

V

OUT

= ±1V, RL = 500Ω±2.5V ● 5V/mV

V

OUT

Output Swing RL = 1k, V

R

= 500Ω, V

L

= 500Ω, V

R

L

= 150Ω, V

R

L

R

= 500Ω, V

L

Output Current V

Short-Circuit Current V

= ±12.2V ±15V ● 24.4 mA

OUT

= ±2.8V ±5V ● 18.7 mA

V

OUT

= 0V, V

OUT

= ±40mV ±15V ● 13.2 ±V

IN

= ±40mV ±15V ● 12.2 ±V

IN

= ±40mV ±5V ● 3.4 ±V

IN

= ±40mV ±5V ● 2.8 ±V

IN

= ±40mV ±2.5V ● 1.2 ±V

IN

= ±3V ±15V ● 25 mA

IN

SR Slew Rate AV = –2, (Note 4) ±15V ● 225 V/µs

±5V

● 125 V/µs

GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ● 15 MHz

±5V

Channel Separation V

I

S

Supply Current Each Amplifier ±15V ● 2.9 mA

= ±10V, RL = 500Ω±15V ● 98 dB

OUT

● 12 MHz

Each Amplifier ±5V ● 2.8 mA

The ● denotes the specifications which apply over the temperature range – 40°C ≤ TA ≤ 85°C, V

SYMBOL PARAMETER CONDITIONS V

V

OS

Input Offset Voltage ±15V ● 1.3 mV

SUPPLY

±5V
±2.5V

= 0V unless otherwise noted. (Note 8)

CM

MIN TYP MAX UNITS

● 1.3 mV

● 1.5 mV

Input VOS Drift (Note 6) ±2.5V to ±15V ● 58 µV/°C

I

OS

I

B

CMRR Common Mode Rejection Ratio V

Input Offset Current ±2.5V to ±15V ● 300 nA
Input Bias Current ±2.5V to ±15V ● 900 nA

= ±12V ±15V ● 80 dB

CM

= ±2.5V ±5V ● 76 dB

V

CM

V

= ±0.5V ±2.5V ● 66 dB

CM

PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V ● 90 dB

4

LT1358/LT1359

ELECTRICAL CHARACTERISTICS

–40°C ≤ TA ≤ 85°C, V

SYMBOL PARAMETER CONDITIONS V

A

V

I

OUT

I

SC

VOL

OUT

Large-Signal Voltage Gain V

Output Swing RL = 1k, V

Output Current V

Short-Circuit Current V

= 0V unless otherwise noted. (Note 8)

CM

= ±12V, RL = 1k ±15V ● 10.0 V/mV

OUT

= ±10V, RL = 500Ω±15V ● 2.5 V/mV

V

OUT

= ±2.5V, RL = 1k ±5V ● 10.0 V/mV

V

OUT

V

= ±2.5V, RL = 500Ω±5V ● 2.5 V/mV

OUT

= ±2.5V, RL = 150Ω±5V ● 0.6 V/mV

V

OUT

= ±1V, RL = 500Ω±2.5V ● 2.5 V/mV

V

OUT

R

= 500Ω, V

L

= 500Ω, V

R

L

= 150Ω, V

R

L

R

= 500Ω, V

L
OUT

V

OUT
OUT

The ● denotes the specifications which apply over the temperature range

SUPPLY

= ±40mV ±15V ● 13.0 ±V

IN

= ±40mV ±15V ● 12.0 ±V

IN

= ±40mV ±5V ● 3.4 ±V

IN

= ±40mV ±5V ● 2.6 ±V

IN

= ±40mV ±2.5V ● 1.2 ±V

IN

= ±12V ±15V ● 24.0 mA
= ±2.6V ±5V ● 17.3 mA

= 0V, V

= ±3V ±15V ● 24 mA

IN

MIN TYP MAX UNITS

SR Slew Rate AV = –2, (Note 4) ±15V ● 180 V/µs

±5V

● 100 V/µs

GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ● 14 MHz

±5V

Channel Separation V

I

S

Supply Current Each Amplifier ±15V ● 3.0 mA

= ±10V, RL = 500Ω±15V ● 98 dB

OUT

● 11 MHz

Each Amplifier ±5V ● 2.9 mA

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

Note 2: Differential inputs of ±10V are appropriate for transient operation
only, such as during slewing. Large, sustained differential inputs will cause
excessive power dissipation and may damage the part. See Input
Considerations in the Applications Information section of this data sheet
for more details.

Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.

Note 4: Slew rate is measured between ±10V on the output with ±6V input

Note 5: Full power bandwidth is calculated from the slew rate

measurement: FPBW = (SR)/2πV

.

P

Note 6: This parameter is not 100% tested.
Note 7. The LT1358C/LT1359C are guaranteed functional over the

operating temperature range of –40°C to 85°C.
Note 8: The LT1358C/LT1359C are guaranteed to meet specified

performance from 0°C to 70°C. The LT1358C/LT1359C 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. For
guaranteed I-grade parts, consult the factory.

for ±15V supplies and ±1V on the output with ±1.75V input for ±5V
supplies.

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage
and Temperature

3.0

2.5

2.0

1.5

SUPPLY CURRENT (mA)

1.0

0.5
10501520

SUPPLY VOLTAGE (±V)

125°C

25°C

–55°C

1358/1359 G01

Input Common Mode Range vs
Supply Voltage

+

V

TA = 25°C

–0.5
–1.0
–1.5
–2.0

2.0

1.5

COMMON MODE RANGE (V)

1.0

0.5

–

V

< 1mV

∆V

OS

SUPPLY VOLTAGE (±V)

10501520

1358/1359 G02

Input Bias Current vs
Input Common Mode Voltage

400

VS = ±15V

= 25°C

T

300

200

100

INPUT BIAS CURRENT (nA)

–100

–200

A

+

–

I

+ I

B

=

————

B

2

I

B

0

–15 –10 0 10 155–5

INPUT COMMON MODE VOLTAGE (V)

1358/1359 G03

5

LT1358/LT1359

OUTPUT CURRENT (mA)

V–+0.5

OUTPUT VOLTAGE SWING (V)

1.5

2.0

1.0

–0.5V

+

–1.0
–1.5
–2.0

2.5

–2.5

–50 –40 –10 30 40 5001020–20–30

1358/1359 G09

VS = ±5V
V

IN

= 100mV

85°C

85°C

25°C

25°C

–40°C

–40°C

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Input Bias Current vs
Temperature

450

400

350

300

250

200

150

INPUT BIAS CURRENT (nA)

100

50

0

–50 –25 25 100 12550 750

TEMPERATURE (°C)

VS = ±15V

=

I

B

Open-Loop Gain vs Temperature

101

VS = ±15V

= 1k

R

100

L

= ±12V

V

O

99

98

97

96

OPEN-LOOP GAIN (dB)

95

94

93

–50 –25 25 100 12550 750

TEMPERATURE (°C)

+

–

I

+ I

B

B

————

 

2

1358/1359 G04

1358/1359 G07

Input Noise Spectral Density

100

e

n

10

i

n

INPUT VOLTAGE NOISE (nV/√Hz)

1

10

1k100 100k10k

FREQUENCY (Hz)

Output Voltage Swing vs
Supply Voltage

+

V

TA = 25°C

–1

–2

–3

3

2

OUTPUT VOLTAGE SWING (V)

1

–

V

10501520

SUPPLY VOLTAGE (±V)

VS = ±15V
T
A
R

R

L

R

= 500Ω

L

= 25°C

A

= 101

V

= 100k

S

1358/1359 G05

RL = 1k

= 500Ω

R

L

= 1k

1358/1359 G08

10

1

0.1

100

INPUT CURRENT NOISE (pA/√Hz)

90

80

70

OPEN-LOOP GAIN (dB)

60

50

Open-Loop Gain vs
Resistive Load

= 25°C

T

A

10

VS = ±15V

100 10k

LOAD RESISTANCE (Ω)

Output Voltage Swing vs
Load Current

VS = ±5V

1k

1358/1359 G06

Output Short-Circuit Current vs
Temperature

65

60

55

50

45

40

35

30

OUTPUT SHORT-CIRCUIT CURRENT (mA)

25

–50 –25 25 100 12550 750

6

SINK

SOURCE

TEMPERATURE (°C)

VS = ±5V

1358/1359 G10

Settling Time vs Output Step
(Noninverting)

10

10mV

8
6
4
2
0

–2

OUTPUT SWING (V)

–4
–6
–8

10mV

–10

50 150 250200100

1mV

1mV

SETTLING TIME (ns)

VS = ±15V

= 1

A

V

1358/1359 G11

Settling Time vs Output Step
(Inverting)

10

8
6
4
2
0

–2

OUTPUT SWING (V)

–4
–6
–8

–10

50 150 250200100

10mV

10mV

SETTLING TIME (ns)

1mV

VS = ±15V

= –1

A

V

1mV

1358/1359 G12

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

LT1358/LT1359

Output Impedance vs Frequency

1k

VS = ±15V

= 25°C

T

A

100

AV = 100

AV = 10

10

AV = 1

1M

FREQUENCY (Hz)

OUTPUT IMPEDANCE (Ω)

0.1

0.01

1

10k

100k 100M

Gain Bandwidth and Phase
Margin vs Temperature

38

PHASE MARGIN

36
34

32
30
28
26
24

GAIN BANDWIDTH (MHz)

22

GAIN BANDWIDTH

20
18

–50 –25 25 100 12550 750

= ±15V

V

S

PHASE MARGIN
V

= ±5V

V

S

TEMPERATURE (°C)

= ±5V

S

GAIN BANDWIDTH
V

= ±15V

S

10M

1358/1359 G13

1358/1359 G16

Frequency Response vs
Capacitive Load

10

VS = ±15V

8

= 25°C

T

A

A

= –1

6

V

4

2
0

–2
–4

VOLTAGE MAGNITUDE (dB)

–6

–8

–10

100k

Frequency Response vs
Supply Voltage (AV = 1)

50
48
46
44

42
40

38

36
34
32

30

5
4
3

PHASE MARGIN (DEG)

2
1

0

GAIN (dB)

–1
–2

–3
–4
–5

100k

C = 1000pF

C = 500pF

1M 100M10M

FREQUENCY (Hz)

T

= 25°C

A

= 1

A

V

= 2k

R

L

1M 100M

FREQUENCY (Hz)

C = 100pF

C = 50pF

C = 0

1358/1359 G19

±15V

±5V

±2.5V

10M

GAIN BANDWIDTH (MHz)

1358/1359 G17

Gain Bandwidth and Phase
Margin vs Supply Voltage

38
36

34
32
30

28
26
24
22
20
18

PHASE MARGIN

GAIN BANDWIDTH

10501520

SUPPLY VOLTAGE (±V)

Frequency Response vs
Supply Voltage (AV = –1)

5

T

= 25°C

A

4

= –1

A

V

R

= RG = 2k

3

F

2
1

0

GAIN (dB)

–1

–2

–3
–4
–5

100k

1M 100M

FREQUENCY (Hz)

±5V

TA = 25°C

1358/1359 G15

±2.5V

10M

50
48

46

PHASE MARGIN (DEG)

44
42
40
38
36
34
32
30

±15V

1358/1359 G18

Gain and Phase vs Frequency

70

60

50

40

30

GAIN (dB)

20

10

0

–10

10k

GAIN

= 25°C

T

A

= –1

A

V

= RG = 2k

R

F

PHASE

VS = ±15V

VS = ±5V

100k 100M

1M

FREQUENCY (Hz)

VS = ±5V

10M

VS = ±15V

1358/1359 G14

120

100

PHASE (DEG)

80

60

40

20

0

Power Supply Rejection Ratio
vs Frequency

100

–PSRR

80

60

40

20

POWER SUPPLY REJECTION RATIO (dB)

0

+PSRR

100k 1M1k 10k100 10M 100M

FREQUENCY (Hz)

VS = ±15V

= 25°C

T

A

1358/1359 G20

Common Mode Rejection Ratio
vs Frequency

120

100

80

60

40

20

COMMON-MODE REJECTION RATIO (dB)

0

1k 100M10M1M100k10k

FREQUENCY (Hz)

VS = ±15V

= 25°C

T

A

1358/1359 G21

7

LT1358/LT1359

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Slew Rate vs Supply Voltage

1000

TA = 25°C

= –1

A

V

800

= RG = 2k

R

600

400

SLEW RATE (V/µs)

200

0

015105

F

SR =

–

SR+ + SR

—————

2

SUPPLY VOLTAGE (±V)

Total Harmonic Distortion
vs Frequency

0.01
TA = 25°C

= 3V

V

O

RMS

RL = 2k

AV = –1

0.001

AV = 1

TOTAL HARMONIC DISTORTION (%)

0.0001
10

100 100k

1k

FREQUENCY (Hz)

10k

1358/1359 G22

1358/1359 G25

Slew Rate vs Temperature

600

500

400

300

200

SLEW RATE (V/µs)

100

= –2

A

V

SR+ + SR

SR = —————

0

–50 –25 25 100 12550 750

–

2

TEMPERATURE (°C)

Undistorted Output Swing vs

Frequency (±15V)

30

25

)

P-P

20

15

10

VS = ±15V

OUTPUT VOLTAGE (V

= 2k

R

L

5

= 1, 1% MAX DISTORTION

A

V

A

= –1, 2% MAX DISTORTION

V

0

100k 1M

AV = 1

FREQUENCY (Hz)

V

VS = ±5V

= ±15V

S

AV = –1

1358/1359 G23

10M

1358/1359 G26

Slew Rate vs Input Level

1000

TA = 25°C

900
800
700
600
500
400

SLEW RATE (V/µs)

300
200
100

= ±15V

V

S

= –1

A

V

= RG = 2k

R

F

SR =

0

0 8 16 2012421018146

SR+ + SR

—————

2

INPUT LEVEL (V

–

Undistorted Output Swing vs

Frequency (±5V)

10

8

)

P-P

6

4

OUTPUT VOLTAGE (V

2

VS = ±5V

= 2k

R

L

2% MAX DISTORTION

0

100k 1M

AV = –1

AV = 1

FREQUENCY (Hz)

P-P

)

1358/1359 G24

10M

1358/1359 G27

2nd and 3rd Harmonic Distortion
vs Frequency Capacitive Load Handling

–30

VS = ±15V

= 2V

V

O

RL = 2k

= 2

A

V

P-P

FREQUENCY (Hz)

3RD HARMONIC

2ND HARMONIC

1M 2M 4M

10M

1358/1359 G28

–40

–50

–60

–70

HARMONIC DISTORTION (dB)

–80

–90

100k 200k 400k

Crosstalk vs Frequency

–40

TA = 25°C

–50

V

= 0dBm

IN

= 500Ω

R

L

–60

–70

–80

–90

CROSSTALK (dB)

–100

–110

–120

100k

= 1

A

V

1M 100M10M

FREQUENCY (Hz)

1358/1359 G29

100

TA = 25°C
V

= ±15V

S

50

OVERSHOOT (%)

0

10p

100p 0.1µ

AV = 1

AV = –1

1000p 0.01µ

CAPACITIVE LOAD (F)

8

1µ

1358/1359 G30

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

LT1358/LT1359

Small-Signal Transient
(AV = 1)

Large-Signal Transient
(AV = 1)

1358/1359 G31

Small-Signal Transient
(AV = –1)

Large-Signal Transient
(AV = –1)

1358/1359 G32

Small-Signal Transient
(AV = –1, CL = 1000pF)

1358/1359 G33

Large-Signal Transient
(AV = 1, CL = 10,000pF)

1358/1359 G34

U

WUU

APPLICATIONS INFORMATION

Layout and Passive Components

The LT1358/LT1359 amplifiers are easy to use and toler­ant of less than ideal layouts. For maximum performance
(for example, fast 0.01% settling) use a ground plane,
short lead lengths, and RF-quality bypass capacitors
(0.01µF to 0.1µF). For high drive current applications use
low ESR bypass capacitors (1µF to 10µF tantalum).

The parallel combination of the feedback resistor and gain
setting resistor on the inverting input combine with the
input capacitance to form a pole which can cause peaking
or oscillations. If feedback resistors greater than 5k are
used, a parallel capacitor of value

CF > RG x CIN / R

F

1358/1359 G35

1358/1359 G36

a large feedback resistor is used, CF should be greater than
or equal to CIN.

Capacitive Loading

The LT1358/LT1359 are stable with any capacitive load.
As the capacitive load increases, both the bandwidth and
phase margin decrease so there will be peaking in the
frequency domain and in the transient response. Coaxial
cable can be driven directly, but for best pulse fidelity a
resistor of value equal to the characteristic impedance of
the cable (i.e., 75Ω) should be placed in series with the
output. The other end of the cable should be terminated
with the same value resistor to ground.

Input Considerations

should be used to cancel the input pole and optimize
dynamic performance. For unity-gain applications where

Each of the LT1358/LT1359 inputs is the base of an NPN
and a PNP transistor whose base currents are of opposite
polarity and provide first-order bias current cancellation.

9

LT1358/LT1359

U

WUU

APPLICATIONS INFORMATION

Because of variation in the matching of NPN and PNP beta,
the polarity of the input bias current can be positive or
negative. The offset current does not depend on NPN/PNP
beta matching and is well controlled. The use of balanced
source resistance at each input is recommended for
applications where DC accuracy must be maximized.

The inputs can withstand transient differential input volt­ages up to 10V without damage and need no clamping or
source resistance for protection. Differential inputs, how­ever, generate large supply currents (tens of mA) as
required for high slew rates. If the device is used with
sustained differential inputs, the average supply current
will increase, excessive power dissipation will result and
the part may be damaged. The part should not be used as

a comparator, peak detector or other open-loop applica­tion with large, sustained differential inputs. Under

normal, closed-loop operation, an increase of power dis­sipation is only noticeable in applications with large slewing
outputs and is proportional to the magnitude of the
differential input voltage and the percent of the time that
the inputs are apart. Measure the average supply current
for the application in order to calculate the power dissipa­tion.

Circuit Operation

The LT1358/LT1359 circuit topology is a true voltage
feedback amplifier that has the slewing behavior of a
current feedback amplifier. The operation of the circuit can
be understood by referring to the simplified schematic.
The inputs are buffered by complementary NPN and PNP
emitter followers which drive a 500Ω resistor. The input
voltage appears across the resistor generating currents
which are mirrored into the high impedance node. Comple­mentary followers form an output stage which buffers the
gain node from the load. The bandwidth is set by the input
resistor and the capacitance on the high impedance node.
The slew rate is determined by the current available to
charge the gain node capacitance. This current is the
differential input voltage divided by R1, so the slew rate is
proportional to the input. Highest slew rates are therefore
seen in the lowest gain configurations. For example, a 10V
output step in a gain of 10 has only a 1V input step,
whereas the same output step in unity gain has a 10 times

greater input step. The curve of Slew Rate vs Input Level
illustrates this relationship. The LT1358/LT1359 are tested
for slew rate in a gain of –2 so higher slew rates can be
expected in gains of 1 and –1, and lower slew rates in
higher gain configurations.

The RC network across the output stage is bootstrapped
when the amplifier is driving a light or moderate load and
has no effect under normal operation. When driving a
capacitive load (or a low value resistive load) the network
is incompletely bootstrapped and adds to the compensa­tion at the high impedance node. The added capacitance
slows down the amplifier which improves the phase
margin by moving the unity-gain frequency away from the
pole formed by the output impedance and the capacitive
load. The zero created by the RC combination adds phase
to ensure that even for very large load capacitances, the
total phase lag can never exceed 180 degrees (zero phase
margin) and the amplifier remains stable.

Power Dissipation

The LT1358/LT1359 combine high speed and large output
drive in small packages. Because of the wide supply
voltage range, it is possible to exceed the maximum
junction temperature under certain conditions. Maximum
junction temperature (TJ) is calculated from the ambient
temperature (TA) and power dissipation (PD) as follows:

LT1358CN8: TJ = TA + (PD x 130°C/W)
LT1358CS8: TJ = TA + (PD x 190°C/W)
LT1359CN: TJ = TA + (PD x 110°C/W)
LT1359CS: TJ = TA + (PD x 150°C/W)

Worst case power dissipation occurs at the maximum
supply current and when the output voltage is at 1/2 of
either supply voltage (or the maximum swing if less than
1/2 supply voltage). For each amplifier P

P

= (V+ – V–)(I

DMAX

Example: LT1358 in S8 at 70°C, VS = ±15V, RL = 500Ω

P

= (30V)(2.9mA) + (7.5V)2/500Ω = 200mW

DMAX

T

= 70°C + (2 x 200mW)(190°C/W) = 146°C

JMAX

) + (V+/2)2/R

SMAX

DMAX

L

is:

10

SI PLIFIED

WW

SCHE ATIC

+

V

LT1358/LT1359

–IN

–

V

PACKAGE DESCRIPTION

0.300 – 0.325

(7.620 – 8.255)

0.065

(1.651)

0.009 – 0.015

(0.229 – 0.381)

+0.035

0.325

–0.015
+0.889

8.255

()

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

TYP

R1

500Ω

+IN

C

R

C

C

C

U

Dimension in inches (millimeters) unless otherwise noted.

N8 Package

8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.045 – 0.065

(1.143 – 1.651)

0.100

(2.54)

BSC

0.130 ± 0.005

(3.302 ± 0.127)

0.125

(3.175)

MIN

0.018 ± 0.003

(0.457 ± 0.076)

0.020

(0.508)

MIN

0.255 ± 0.015*
(6.477 ± 0.381)

876

1234

1358/1359 SS01

0.400*
(10.160)

MAX

OUT

5

N8 1098

0.300 – 0.325

(7.620 – 8.255)

0.009 – 0.015

(0.229 – 0.381)

+0.035

0.325

–0.015
+0.889

8.255

()

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

0.020

(0.508)

MIN

0.130 ± 0.005

(3.302 ± 0.127)

0.125

(3.175)

MIN

0.005

(0.125)

MIN

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

N Package

14-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.045 – 0.065

(1.143 – 1.651)

0.065

(1.651)

TYP

0.018 ± 0.003

0.100
(2.54)

BSC

(0.457 ± 0.076)

0.255 ± 0.015*
(6.477 ± 0.381)

0.770*
(19.558)

MAX

14

2

11

1213

31

5

4

8910

7

6

N14 1098

11

LT1358/LT1359

U

TYPICAL APPLICATIONS

Instrumentation Amplifier

R5

432Ω

R1

20k

–

V

IN

–

LT1358

+

R2

2k

R3

1/2

2k

–

1/2

LT1358

+

+





R

RRRRRR

4

12213423



A

=+ +

1

V

TRIM R5 FOR GAIN
TRIM R1 FOR COMMON-MODE REJECTION
BW = 250kHz



R

3











+



+

=




104

R

5





PACKAGE DESCRIPTION

0.010 – 0.020

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)

*

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

× 45°

0.016 – 0.050

(0.406 – 1.270)

0°– 8° TYP

200kHz, 4th Order Butterworth Filter

R4

20k

1358/1359 TA03

V

IN

V

OUT

5.62k3.4k

330pF

3.4k

–

+

100pF

1/2

LT1358

U

Dimension in inches (millimeters) unless otherwise noted.

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*
(4.801 – 5.004)

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

TYP

0.004 – 0.010

(0.101 – 0.254)

0.050

(1.270)

BSC

0.228 – 0.244

(5.791 – 6.197)

8

1

2.61k

47pF

5.11k

2.61k

7

2

5

6

3

1000pF

0.150 – 0.157**
(3.810 – 3.988)

4

–

LT1358

+

SO8 1298

1/2

1358/1359 TA04

V

OUT

S Package

16-Lead Plastic Small Outline (Narrow 0.150)

0.010 – 0.020

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)

*

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

× 45°

0.016 – 0.050

(0.406 – 1.270)

0° – 8° TYP

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

TYP

(LTC DWG # 05-08-1610)

0.004 – 0.010

(0.101 – 0.254)

0.050

(1.270)

BSC

0.228 – 0.244

(5.791 – 6.197)

16

15

1

2

0.386 – 0.394*

(9.804 – 10.008)

13

14

3

12

11

10

9

0.150 – 0.157**
(3.810 – 3.988)

5

4

7

6

8

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LT1357 25MHz, 600V/µs Op Amp Single Version of LT1358/LT1359
LT1361/LT1362 Dual and Quad 50MHz, 800V/µs Op Amps Faster Version of LT1358/LT1359, VOS = 1mV, IS = 4mA/Amplifier
LT1355/LT1356 Dual and Quad 12MHz, 400V/µs Op Amps Lower Power Version of LT1358/LT1359, VOS = 0.8mV, IS = 1mA/Amplifier

13589fa LT/TP 0400 2K REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1994

12

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

[phone] ● FAX: [phone]

●

www.linear-tech.com

S16 1098