Datasheet

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LT1211/LT1212

FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATIO

14MHz, 7V/µs, Single Supply

Dual and Quad

Precision Op Amps

■

Slew Rate: 7V/

s Typ

■

Gain-Bandwidth Product: 14MHz Typ

■

Fast Settling to 0.01%

2V Step to 200µV: 900ns Typ

10V Step to 1mV: 2.2µs Typ

■

Excellent DC Precision in All Packages

Input Offset Voltage: 275µV Max

Input Offset Voltage Drift: 6µV/°C Max

Input Offset Current: 30nA Max

Input Bias Current: 125nA Max

Open-Loop Gain: 1200V/mV Min

■

Single Supply Operation

Input Voltage Range Includes Ground

Output Swings to Ground While Sinking Current

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Low Input Noise Voltage: 12nV/√Hz Typ

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Low Input Noise Current: 0.2pA/√Hz Typ

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Specified on 3.3V, 5V and ±15V

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Large Output Drive Current: 20mA Min

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Low Supply Current per Amplifier: 1.8mA Max

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Dual in 8-Pin DIP and SO-8

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Quad in 14-Pin DIP and Narrow SO-16

The LT

1211 is a dual, single supply precision op amp with

a 14MHz gain-bandwidth product and a 7V/µs slew rate.

The LT1212 is a quad version of the same amplifier. The

DC precision of the LT1211/LT1212 eliminates trims in

most systems while providing high frequency perfor-

mance not usually found in single supply amplifiers.

The LT1211/LT1212 will operate on any supply greater

than 2.5V and less than 36V total. These amplifiers are

specified on single 3.3V, single 5V and ±15V supplies, and

only require 1.3mA of quiescent supply current per ampli-

fier. The inputs can be driven beyond the supplies without

damage or phase reversal of the output. The minimum

output drive is 20mA, ideal for driving low impedance

loads.

Note: For applications requiring higher slew rate, see the LT1213/LT1214 and

LT1215/LT1216 data sheets.

Input Bias Current Cancellation

–

1/2

LT1211

OUT

1211/12 TA01

SIGNAL AMP

–

1/2

LT1211

CANCELLATION

AMP

22pF

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

■

2.5V Full-Scale 12-Bit Systems: V

≤ 0.45LSB

■

10V Full-Scale 16-Bit Systems: V

≤ 1.8LSB

■

Active Filters

■

Photo Diode Amplifiers

■

DAC Current-to-Voltage Amplifiers

■

Battery-Powered Systems

INPUT VOLTAGE (V)

0.01

INPUT CURRENT (nA)

0.1 1 10

1211/12 TA02

100

= 5V, V

OUT

LINEAR REGION

= 300M

= 2.4G

WITHOUT CANCELLATION

WITH CANCELLATION

Input Current vs Input Voltage

Summary of content (20 pages)

PAGE 1
LT1211/LT1212 14MHz, 7V/µs, Single Supply Dual and Quad Precision Op Amps U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Slew Rate: 7V/µs Typ Gain-Bandwidth Product: 14MHz Typ Fast Settling to 0.01% 2V Step to 200µV: 900ns Typ 10V Step to 1mV: 2.
PAGE 2
LT1211/LT1212 W W W AXI U U ABSOLUTE RATI GS (Note 1) Total Supply Voltage (V + to V –) ............................. 36V Input Current ..................................................... ±15mA Output Short-Circuit Duration (Note 2) ........ Continuous Operating Temperature Range LT1211C/LT1212C ............................ – 40°C to 85°C LT1211I/LT1212I ............................... – 40°C to 85°C LT1211M (OBSOLETE) ...............
PAGE 3
LT1211/LT1212 U AVAILABLE OPTIO S NUMBER OF OP AMPS Two (Dual) TA RANGE – 55°C to 125°C Four (Quad) – 40°C to 85°C MAX VOS (25°C) 150µV 275µV 275µV MAX TC VOS (∆VOS /∆T) 1.5µV/°C 3µV/°C 6µV/°C CERAMIC (J) OBSOLETE LT1211AMJ8 LT1211MJ8 PACKAGE PLASTIC DIP (N) SURFACE MOUNT (S) LT1212CN, LT1212IN LT1212CS, LT1212IS 5V ELECTRICAL CHARACTERISTICS VS = 5V, VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted.
PAGE 4
LT1211/LT1212 5V ELECTRICAL CHARACTERISTICS VS = 5V, VCM = 0.5V, VOUT = 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL VOS ∆VOS ∆T IOS IB CMRR PSRR AVOL IS PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 4) Input Offset Current Input Bias Current Input Voltage Range CONDITIONS Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing (Note 5) VCM = 0.1V to 3.4V VS = 2.5V to 12.5V VO = 0.05V to 3.
PAGE 5
LT1211/LT1212 5V ELECTRICAL CHARACTERISTICS VS = 5V, VCM = 0.5V, VOUT = 0.5V, – 55°C ≤ TA ≤ 125°C, unless otherwise noted. SYMBOL VOS ∆VOS ∆T IOS IB CMRR PSRR AVOL IS PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 4) Input Offset Current Input Bias Current Input Voltage Range CONDITIONS Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing (Note 5) VCM = 0.4V to 3.1V VS = 2.5V to 12.5V VO = 0.05V to 3.
PAGE 6
LT1211/LT1212 + –15V ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, VOUT = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL VOS ∆VOS ∆T IOS IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 4) Input Offset Current Input Bias Current Input Voltage Range CONDITIONS CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing VCM = –14.9V to 13.
PAGE 7
LT1211/LT1212 3.3V ELECTRICAL CHARACTERISTICS VS = 3.3V, VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted. (Note 8) SYMBOL PARAMETER VOS Input Offset Voltage Input Voltage Range (Note 9) IO CONDITIONS Maximum Output Voltage Swing Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA Maximum Output Current MIN 1.8 0 2.60 2.50 2.15 ±20 LT1211AC LT1211AM TYP MAX 75 150 2.1 – 0.3 2.70 2.60 2.30 0.003 0.
PAGE 8
LT1211/LT1212 ELECTRICAL CHARACTERISTICS 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 when the output is shorted indefinitely.
PAGE 9
LT1211/LT1212 U W TYPICAL PERFOR A CE CHARACTERISTICS Voltage Gain, Phase vs Frequency CL = 20pF RL = 2k 120 CL = 20pF RL = 2k PHASE 40 VS = ±15V 20 VOLTAGE GAIN (dB) 60 VS = 5V 20 VS = ±15V 20 GAIN 0 –20 0 VS = ±15V 0 –20 10 100 –40 10k 100k 1M 10M 100M FREQUENCY (Hz) 1k –20 100k 12 60 10 50 TA = 25°C, 125°C 40 TA = –55°C 30 20 10 1 3 5 7 10 20 TOTAL SUPPLY VOLTAGE (V) 1211/12 G08 Slew Rate vs Temperature Capacitive Load Handling 10 80 AV = –2 RL = 10k VS = ±15V 0 30 40
PAGE 10
LT1211/LT1212 U W TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Voltage Gain vs Supply Voltage Positive Output Saturation Voltage vs Temperature Open-Loop Gain, VS = 5V 6k 1.4 SATURATION VOLTAGE, V + – VOUT (V) RL = 2k 5k 4k TA = –55°C 3k TA = 25°C 2k TA = 125°C INPUT, 5µV/DIV OPEN-LOOP VOLTAGE GAIN (V/mV) RL = 2k RL = 500Ω 0 1k 1 2 3 OUTPUT (V) 4 VS = 5V 1.2 ISOURCE = 20mA 1.0 ISOURCE = 10mA 0.8 ISOURCE = 1mA 0.6 ISOURCE = 10µA 0.
PAGE 11
LT1211/LT1212 U W TYPICAL PERFOR A CE CHARACTERISTICS 5V Large-Signal Response 5V Large-Signal Response 5V Small-Signal Response 3V 0V 0V 20mV/DIV 3V 100ns/DIV VS = 5V AV = 1 500ns/DIV VS = 5V AV = 1 1211/12 G25 ±15V Large-Signal Response 20mV/DIV ±15V Small-Signal Response VS = ±15V AV = 1 500ns/DIV VS = 5V AV = –1 RF = RG = 1k CF = 20pF 1211/12 G26 ±15V Large-Signal Response 10V 10V 0V 0V –10V –10V 100ns/DIV 2µs/DIV VS = ±15V AV = 1 1211/12 G28 VS = ±15V AV = –1 RF = RG = 1k
PAGE 12
LT1211/LT1212 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage Supply Current vs Temperature TA = 25°C 1 TA = –55°C 1 0 3 2 4 SUPPLY VOLTAGE (V) 2 VS = ±15V 2.2 1.8 VS = 5V 1.4 1.0 0.
PAGE 13
LT1211/LT1212 U W U UO APPLICATI S I FOR ATIO Supply Voltage The LT1211/LT1212 op amps are fully functional and all internal bias circuits are in regulation with 2.2V of supply. The amplifiers will continue to function with as little as 1.5V, although the input common-mode range and the phase margin are about gone. The minimum operating supply voltage is guaranteed by the PSRR tests which are done with the input common mode equal to 500mV and a minimum supply voltage of 2.5V.
PAGE 14
LT1211/LT1212 U W U UO APPLICATI S I FOR ATIO Inputs Typically, at room temperature, the inputs of the LT1211/ LT1212 can common mode 400mV below ground (V –) and to within 1.2V of the positive supply with the amplifier still functional. However the input bias current and offset voltage will shift as shown in the characteristic curves. For full precision performance, the common-mode range should be limited between ground (V –) and 1.5V below the positive supply.
PAGE 15
LT1211/LT1212 W U U UO APPLICATI S I FOR ATIO following photos. These amplifiers are unity-gain stable op amps and not fast comparators, therefore, the logic being driven may oscillate due to the long transition time. The output can be speeded up by adding 20mV or more of hysteresis (positive feedback), but the offset is then a function of the input direction. Comparator Applications Sometimes it is desirable to use an op amp as a comparator. When operating the LT1211/LT1212 on a single 3.
PAGE 16
LT1211/LT1212 UO TYPICAL APPLICATI S 1A Voltage-Controlled Current Source V+ 1Ω 1k 1k 1k 500pF – VIN 100Ω 1/2 LT1211 Si9430DY P-CHANNEL + IOUT V IOUT = IN 1Ω tr < 1µs 1k RL 1211/12 TA04 1A Voltage-Controlled Current Sink V+ V+ VIN RL IOUT + 1/2 LT1211 – 100Ω Si9410DY N-CHANNEL 500pF 1k V IOUT = IN 1Ω tr < 1µs 16 1Ω 1211/12 TA05
PAGE 17
LT1211/LT1212 U PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) 0.023 – 0.045 (0.584 – 1.143) HALF LEAD OPTION 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.005 (0.127) MIN 0.405 (10.287) MAX 8 7 6 5 0.025 (0.635) RAD TYP 0.220 – 0.310 (5.588 – 7.874) 1 2 0.300 BSC (0.762 BSC) 3 4 0.200 (5.080) MAX 0.015 – 0.060 (0.381 – 1.524) 0.008 – 0.018 (0.203 – 0.
PAGE 18
LT1211/LT1212 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) ) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 (2.
PAGE 19
LT1211/LT1212 U PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 7 8 5 6 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 1298 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 3 2 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 (0.406 – 1.270) 0.050 (1.270) BSC 0.014 – 0.019 (0.355 – 0.
PAGE 20
LT1211/LT1212 U TYPICAL APPLICATIO Single Supply, 100kHz, 4th Order Butterworth Lowpass Filter C1 1000pF R1 2.94k VIN C2 1000pF 1000pF – 1/4 LT1211 R2 866Ω 1000pF – 1.21k 1/4 LT1211 + – 1/4 LT1211 + 2.10k – 1/4 LT1211 + 2.94k VOUT + 1. 21k 1211/12 TA03a 20k 3.3V + 13k 10 1µF 0 –10 12-BIT ACCURATE SIGNAL RANGE FROM 6mV TO 1.8V ON 3.3V SINGLE SUPPLY. MAXIMUM OUTPUT OFFSET ERROR IS 676µV.