Datasheet

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LT1363

70MHz, 1000V/µs Op Amp

■

Wideband Amplifiers

■

Buffers

■

Active Filters

■

Video and RF Amplification

■

Cable Drivers

■

Data Acquisition Systems

■

70MHz Gain Bandwidth

■

1000V/µs Slew Rate

■

7.5mA Maximum Supply Current

■

9nV/√Hz Input Noise Voltage

■

Unity-Gain Stable

■

C-Load

Op Amp Drives All Capacitive Loads

■

1.5mV Maximum Input Offset Voltage

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2µA Maximum Input Bias Current

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350nA Maximum Input Offset Current

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50mA Minimum Output Current

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±7.5V Minimum Output Swing into 150Ω

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4.5V/mV Minimum DC Gain, R

=1k

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50ns Settling Time to 0.1%, 10V Step

■

0.06% Differential Gain, A

=2, R

=150Ω

■

0.04° Differential Phase, A

=2, R

=150Ω

■

Specified at ±2.5V, ±5V, and ±15V

The LT1363 is a high speed, very high slew rate opera-

tional amplifier with excellent DC performance. The LT1363

features reduced supply current, lower input offset volt-

age, lower input bias current and higher DC gain than

devices with comparable bandwidth. The circuit topology

is a voltage feedback amplifier with the slewing character-

istics of a current feedback amplifier. The amplifier is a

single gain stage with outstanding settling characteristics

which makes the circuit an ideal choice for data acquisition

systems. The output drives a 150Ω load to ±7.5V with

±15V supplies and to ±3.4V on ±5V supplies. The amplifier

is also capable of driving any capacitive load which makes

it useful in buffer or cable driver applications.

The LT1363 is a member of a family of fast, high perfor-

mance amplifiers using this unique topology and

employing Linear Technology Corporation’s advanced

bipolar complementary processing. For dual and quad

amplifier versions of the LT1363 see the LT1364/1365

data sheet. For 50MHz amplifiers with 4mA of supply

current per amplifier see the LT1360 and LT1361/1362

data sheets. For lower supply current amplifiers with

bandwidths of 12MHz and 25MHz see the LT1354 through

LT1359 data sheets. Singles, duals, and quads of each

amplifier are available.

Cable Driver Frequency Response

= –1 Large-Signal Response

1363 TA02

FREQUENCY (MHz)

–8

–6

–4

–2

GAIN (dB)

100

1363 TA01

= ±10V

= ±5V

= ±2.5V

= ±15V

–

LT1363

510Ω

75Ω

OUT

75Ω

510Ω

C-Load is a trademark of Linear Technology Corporation

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

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

Summary of content (12 pages)

PAGE 1
LT1363 70MHz, 1000V/µs Op Amp U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 70MHz Gain Bandwidth 1000V/µs Slew Rate 7.5mA Maximum Supply Current 9nV/√Hz Input Noise Voltage Unity-Gain Stable C-LoadTM Op Amp Drives All Capacitive Loads 1.5mV Maximum Input Offset Voltage 2µA Maximum Input Bias Current 350nA Maximum Input Offset Current 50mA Minimum Output Current ±7.5V Minimum Output Swing into 150Ω 4.5V/mV Minimum DC Gain, RL=1k 50ns Settling Time to 0.1%, 10V Step 0.
PAGE 2
LT1363 W W U W ABSOLUTE MAXIMUM RATINGS Total Supply Voltage (V+ to V –) ............................... (Note 1) 36V Differential Input Voltage (Transient Only) (Note 2)................................... ±10V Input Voltage ............................................................ ±VS Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 8) ...–40°C to 85°C Specified Temperature Range (Note 9) ....
PAGE 3
LT1363 ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS VOUT Output Swing RL = 1k, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 150Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV ±15V ±15V ±5V ±5V ±2.5V 13.5 13.0 3.5 3.4 1.3 14.0 13.7 4.1 3.8 1.7 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±7.5V VOUT = ±3.
PAGE 4
LT1363 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. The ● denotes the specifications which apply over the temperature range SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V ● 88 dB AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 1k VOUT = ±10V, RL = 500Ω VOUT = ±2.5V, RL = 500Ω VOUT = ±2.5V, RL = 150Ω VOUT = ±1V, RL = 500Ω ±15V ±15V ±5V ±5V ±2.5V ● ● ● ● ● 3.6 2.4 2.4 1.5 2.
PAGE 5
LT1363 ELECTRICAL CHARACTERISTICS 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.
PAGE 6
LT1363 U W TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage Swing vs Supply Voltage Open-Loop Gain vs Temperature V+ V+ RL = 1k VO = ±12V VS = ±15V –0.5 OUTPUT VOLTAGE SWING (V) 80 79 78 77 76 TA = 25°C –0.5 RL = 1k –1.0 –1.5 RL = 500Ω –2.0 2.0 RL = 500Ω 1.5 RL = 1k 1.0 75 0.5 74 – 50 –25 0 25 50 75 TEMPERATURE (°C) 100 0 125 5 10 15 SUPPLY VOLTAGE (±V) 20 OUTPUT IMPEDANCE (Ω) SINK 90 0 25 50 75 TEMPERATURE (°C) 100 AV = 100 10 1 AV = 10 AV = 1 0.
PAGE 7
LT1363 U W TYPICAL PERFORMANCE CHARACTERISTICS Gain Bandwidth and Phase Margin vs Temperature 120 PHASE MARGIN VS = ±15V 100 10 45 8 40 6 35 90 30 80 GAIN BANDWIDTH VS = ±15V 70 60 25 20 15 50 GAIN BANDWIDTH VS = ±5V 40 30 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 PHASE MARGIN (DEG) 5 TA = 25°C AV = 1 RL = 1k 0 10 –6 5 –8 –3 ±2.
PAGE 8
LT1363 U W TYPICAL PERFORMANCE CHARACTERISTICS Total Harmonic Distortion vs Frequency 30 TA = 25°C VO = 3VRMS RL = 500Ω 20 15 10 5 0.0001 100 1k 10k FREQUENCY (Hz) VS = ±15V RL = 1k AV = 1, 1% MAX DISTORTION AV = –1, 2% MAX DISTORTION 0 100k 100k OUTPUT VOLTAGE (VP-P) AV = 1 AV = 1 1M FREQUENCY (Hz) 3RD HARMONIC DIFFERENTIAL GAIN 2ND HARMONIC –80 –90 –100 100k 200k 400k 1M 2M FREQUENCY (Hz) 4M 10M DIFFERENTIAL PHASE (DEG) HARMONIC DISTORTION (dB) 0.1 –70 0 0.3 0.
PAGE 9
LT1363 U W TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Transient (AV = 1) Large-Signal Transient (AV = 1, CL = 10,000pF) Large-Signal Transient (AV = –1) 1363 TA34 1363 TA35 1363 TA36 U U W U APPLICATIONS INFORMATION The LT1363 may be inserted directly into AD817, AD847, EL2020, EL2044, and LM6361 applications improving both DC and AC performance, provided that the nulling circuitry is removed. The suggested nulling circuit for the LT1363 is shown below.
PAGE 10
LT1363 U W U U APPLICATIONS INFORMATION Input Considerations Each of the LT1363 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. 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.
PAGE 11
LT1363 U U W U APPLICATIONS INFORMATION 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.
PAGE 12
LT1363 U TYPICAL APPLICATIONS Two Op Amp Instrumentation Amplifier R5 220Ω R1 10k 2MHz, 4th Order Butterworth Filter R4 10k 464Ω R2 1k 47pF 22pF 464Ω 1.33k – VIN R3 1k – – LT1363 + – 549Ω 1.