Datasheet

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LT1208/LT1209

Dual and Quad

45MHz, 400V/µs Op Amps

■

45MHz Gain-Bandwidth

■

400V/µs Slew Rate

■

Unity-Gain Stable

■

7V/mV DC Gain, R

= 500Ω

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3mV Maximum Input Offset Voltage

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±12V Minimum Output Swing into 500Ω

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Wide Supply Range: ±2.5V to ±15V

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7mA Supply Current per Amplifier

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90ns Settling Time to 0.1%, 10V Step

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Drives All Capacitive Loads

ESCRIPTIO

The LT1208/LT1209 are dual and quad very high speed

operational amplifiers with excellent DC performance. The

LT1208/LT1209 feature reduced input offset voltage and

higher DC gain than devices with comparable bandwidth

and slew rate. Each amplifier is a single gain stage with

outstanding settling characteristics. The fast settling time

makes the circuit an ideal choice for data acquisition

systems. Each output is capable of driving a 500Ω load to

±12V with ±15V supplies and a 150Ω load to ±3V on ±5V

supplies. The amplifiers are also capable of driving large

capacitive loads which make them useful in buffer or cable

driver applications.

The LT1208/LT1209 are members of a family of fast, high

performance amplifiers that employ Linear Technology

Corporation’s advanced bipolar complementary

processing.

ITY

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Wideband Amplifiers

■

Buffers

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Active Filters

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Video and RF Amplification

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Cable Drivers

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Data Acquisition Systems

1MHz, 4th Order Butterworth Filter

1208/09 TA02

–

1/2

LT1208

2.67k909Ω

47pF

220pF

909Ω

–

1/2

LT1208

2.21k1.1k

22pF

470pF

1.1k

OUT

1208/09 TA01

Inverter Pulse Response

Summary of content (12 pages)

PAGE 1
LT1208/LT1209 Dual and Quad 45MHz, 400V/µs Op Amps U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 45MHz Gain-Bandwidth 400V/µs Slew Rate Unity-Gain Stable 7V/mV DC Gain, RL = 500Ω 3mV Maximum Input Offset Voltage ±12V Minimum Output Swing into 500Ω Wide Supply Range: ±2.5V to ±15V 7mA Supply Current per Amplifier 90ns Settling Time to 0.1%, 10V Step Drives All Capacitive Loads The LT1208/LT1209 are dual and quad very high speed operational amplifiers with excellent DC performance.
PAGE 2
LT1208/LT1209 W W W AXI U U ABSOLUTE RATI GS Total Supply Voltage (V + to V –) .............................. 36V Differential Input Voltage ........................................ ±6V Input Voltage ........................................................... ±VS Output Short-Circuit Duration (Note 1) ........... Indefinite Operating Temperature Range LT1208C/LT1209C .......................... – 40°C to 85°C Maximum Junction Temperature Plastic Package .............................................
PAGE 3
LT1208/LT1209 ELECTRICAL CHARACTERISTICS VS = ±15V, TA = 25°C, RL = 1k, VCM = 0V, unless otherwise noted.
PAGE 4
LT1208/LT1209 U W TYPICAL PERFOR A CE CHARACTERISTICS Input Common-Mode Range vs Supply Voltage Supply Current vs Supply Voltage and Temperature 20 10 SUPPLY CURRENT (mA) 15 10 +VCM 125°C –VCM 5 8 OUTPUT VOLTAGE SWING (V) MAGNITUDE OF INPUT VOLTAGE (V) 20 12 TA = 25°C ∆VOS < 1mV 25°C 6 –55°C 4 2 0 0 0 5 10 15 SUPPLY VOLTAGE (±V) 20 15 10 VS = ±5V 100 1k LOAD RESISTANCE (Ω) 10k 4.5 TA = 25°C 90 2 4.0 3.5 4.00 3.75 3.
PAGE 5
LT1208/LT1209 U W TYPICAL PERFOR A CE CHARACTERISTICS Power Supply Rejection Ratio vs Frequency Crosstalk vs Frequency 100 CROSSTALK (dB) –50 –60 –70 VS = ±5V RL = 500Ω –80 –90 VS = ±15V RL = 1k –100 –110 –120 100k 1M 10M FREQUENCY (Hz) 120 VS = ±15V TA = 25°C 80 +PSRR 60 –PSRR 40 20 0 100 100M 1k 10k 100k 1M FREQUENCY (Hz) Voltage Gain and Phase vs Frequency 100 VS = ±5V 40 VS = ±5V 40 VS = ±15V 1k 6 AV = 1 AV = 1 –4 –6 0 100M AV = –1 AV = –1 VS = ±15V TA = 25°C 10mV SETTLING
PAGE 6
LT1208/LT1209 U W TYPICAL PERFOR A CE CHARACTERISTICS Gain-Bandwidth and Phase Margin vs Supply Voltage 62 TA = 25°C TA = 25°C AV = –1 60 55 PHASE MARGIN 58 45 56 40 54 35 52 50 30 500 GAIN BANDWIDTH SLEW RATE (V/µs) 50 PHASE MARGIN (DEG) GAIN-BANDWIDTH (MHz) 0.
PAGE 7
LT1208/LT1209 U W U UO APPLICATI S I FOR ATIO caused by a second pole beyond the unity-gain crossover. This is reflected in the 50° phase margin and shows up as overshoot in the unity-gain small-signal transient response. Higher noise gain configurations exhibit less overshoot as seen in the inverting gain of one response. Small-Signal Capacitive Loading AV = –1 CL = 1000pF 1208/09 AI01 The large-signal response in both inverting and noninverting gain show symmetrical slewing characteristics.
PAGE 8
LT1208/LT1209 U W U UO APPLICATI S I FOR ATIO Power Dissipation Large-Signal Transient Response The LT1208/LT1209 combine high speed and large output current drive in small packages. Because of the wide supply voltage range, it is possible to exceed the maximum junction temperature under certain conditions.
PAGE 9
LT1208/LT1209 UO TYPICAL APPLICATI S Cable Driving DAC Current-to-Voltage Converter 7pF + VIN R3 75Ω 1/2 LT1208 5k VOUT – DAC-08 TYPE 1/2 LT1208 VOUT R2 1k + 0.
PAGE 10
LT1208/LT1209 W W SI PLIFIED SCHE ATIC V+ BIAS 1 +IN –IN BIAS 2 OUT V– 1208/09 SS U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.300 – 0.320 (7.620 – 8.128) 0.045 – 0.065 (1.143 – 1.651) ( 0.130 ± 0.005 (3.302 ± 0.127) 8 7 6 +0.025 0.325 –0.015 0.250 ± 0.010 (6.350 ± 0.254) 0.125 (3.175) MIN 0.045 ± 0.015 (1.143 ± 0.381) ) 0.100 ± 0.010 (2.540 ± 0.254) 0.020 (0.508) MIN 1 2 0.010 – 0.020 × 45° (0.254 – 0.508) 0.
PAGE 11
LT1208/LT1209 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N Package 14-Lead Plastic DIP 0.770 (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 0.260 ± 0.010 (6.604 ± 0.254) 0.300 – 0.325 (7.620 – 8.255) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.015 (0.380) MIN 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) +0.025 0.325 –0.015 ( 8.255 +0.635 –0.381 ) 0.125 (3.175) MIN 0.075 ± 0.015 (1.905 ± 0.381) 0.018 ± 0.003 (0.457 ± 0.
PAGE 12
LT1208/LT1209 U.S. Area Sales Offices NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd.