Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Op-amp Multi-purpose SO 14

LT1366/LT1367

LT1368/LT1369

1366fb

Typical applicaTion

FeaTures DescripTion

Dual and Quad Precision

Rail-to-Rail Input and Output

Op Amps

The LT

1366/LT1367/LT1368/LT1369 are dual and quad

bipolar op amps which combine rail-to-rail input and output

operation with precision speciﬁcations. These op amps

maintain their characteristics over a supply range of 1.8V

to 36V. Operation is speciﬁed for 3V, 5V and ±15V supplies.

Input offset voltage is typically 150µV, with an open-loop

gain A

VOL

of 1 million while driving a 10k load. Common

mode rejection is typically 90dB over the full rail-to-rail

input range, and supply rejection is 110dB.

The LT1366/LT1367 have conventional compensation

which assures stability for capacitive loads of 1000pF or

less. The LT1368/LT1369 have compensation that requires

a 0.1µF output capacitor, which improves the ampliﬁer’s

supply rejection and reduces output impedance at high

frequencies. The output capacitor’s ﬁltering action reduces

high frequency noise, which is beneﬁcial when driving

A/D converters.

The LT1366/LT1368 are available in plastic 8-pin PDIP

and 8-lead SO packages with the standard dual op amp

pinout. The LT1367/LT1369 feature the standard quad

pinout, which is available in a plastic 14-lead SO package.

These devices can be used as plug-in replacements for

many standard op amps to improve input/output range

and precision.

Positive Supply Rail Current Sense

applicaTions

Input Common Mode Range Includes Both Rails

Output Swings Rail-to-Rail

Low Input Offset Voltage: 150µV

High Common Mode Rejection Ratio: 90dB

High A

VOL

: >1V/µV Driving 10k Load

Low Input Bias Current: 10nA

Wide Supply Range: 1.8V to ±15V

Low Supply Current: 375µA per Ampliﬁer

High Output Drive: 30mA

400kHz Gain-Bandwidth Product

Slew Rate: 0.13V/µs

Stable for Capacitive Loads Up to 1000pF

Rail-to-Rail Buffer Ampliﬁers

Low Voltage Signal Processing

Supply Current Sensing at Either Rail

Driving A/D Converters

L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered

trademarks and C-Load is a trademark of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

LOAD CURRENT (mA)

SATURATION VOLTAGE (mV)

OUT

– V

0.001 0.1 1 10

1366 TA02

0.01

1000

100

POSITIVE

RAIL

NEGATIVE

RAIL

Output Saturation Voltage vs Load Current

–

1/2 LT1366

200Ω

1366 TA01

LOAD

0.2Ω

20k

TP0610L

= I

LOAD

• R

= I

LOAD

• 20Ω

(

)

–

1/2 LT1366

Summary of content (20 pages)

PAGE 1
LT1366/LT1367 LT1368/LT1369 Dual and Quad Precision Rail-to-Rail Input and Output Op Amps Description Features n n n n n n n n n n n Input Common Mode Range Includes Both Rails Output Swings Rail-to-Rail Low Input Offset Voltage: 150µV High Common Mode Rejection Ratio: 90dB High AVOL: >1V/µV Driving 10k Load Low Input Bias Current: 10nA Wide Supply Range: 1.8V to ±15V Low Supply Current: 375µA per Amplifier High Output Drive: 30mA 400kHz Gain-Bandwidth Product Slew Rate: 0.
PAGE 2
LT1366/LT1367 LT1368/LT1369 Absolute Maximum Ratings (Note 1) Total Supply Voltage (V+ to V–)................................. 36V Input Current........................................................ ±15mA Output Short-Circuit Duration (Note 2)......... Continuous Operating Temperature Range ............... –40°C to 85°C Specified Temperature Range....................... 0°C to 70°C Junction Temperature .......................................... 150°C Storage Temperature Range..................
PAGE 3
LT1366/LT1367 LT1368/LT1369 Electrical Characteristics TA = 25°C; VS = 5V, 0V; VCM = 2.5V; VO = 2.5V, unless otherwise noted.
PAGE 4
LT1366/LT1367 LT1368/LT1369 Electrical Characteristics The l denotes the specifications which apply over the specified temperature range of 0°C < TA < 70°C. VS = 5V, 0V; VCM = 2.5V, VO = 2.5V, unless otherwise noted.
PAGE 5
LT1366/LT1367 LT1368/LT1369 Electrical Characteristics SYMBOL ∆IOS AVOL CMRR VOL VOH ISC IS TA = 25°C; VS = 3V, 0V; VCM = 1.5V; VO = 1.5V, unless otherwise noted. PARAMETER Input Offset Current Shift Input Bias Current Match (Channel to Channel) CONDITIONS VCM = VEE to VCC VCM = VCC (Note 4) VCM = VEE (Note 4) Large-Signal Voltage Gain VO = 50mV to 2.
PAGE 6
LT1366/LT1367 LT1368/LT1369 Electrical Characteristics TA = 25°C, VS = ±15V, VCM = 0V, VO = 0V, unless otherwise noted.
PAGE 7
LT1366/LT1367 LT1368/LT1369 Electrical Characteristics The l denotes the specifications which apply over the specified temperature range of 0°C < TA < 70°C. VS = ±15V, VCM = 0V, VO = 0V, unless otherwise noted.
PAGE 8
LT1366/LT1367 LT1368/LT1369 Typical Performance Characteristics (The data presented here applies to the LT1366/LT1367/LT1368/LT1369 unless otherwise noted.
PAGE 9
LT1366/LT1367 LT1368/LT1369 Typical Performance Characteristics (The data presented here applies to the LT1366/LT1367/LT1368/LT1369 unless otherwise noted.) 0.1Hz to 10Hz Output Voltage Noise Minimum Supply Voltage Noise Voltage Spectrum 70 VS = ±2.5V VCM = 0V TA = 70°C TA = 85°C 100 50 TA = 25°C 0 TA = –55°C NOISE VOLTAGE nV/√Hz 150 70 VS = 5V, 0V 60 0.7 0.2 VCM = 4V 0.
PAGE 10
LT1366/LT1367 LT1368/LT1369 Typical Performance Characteristics (The data presented here applies to the LT1366/LT1367/LT1368/LT1369 unless otherwise noted.
PAGE 11
LT1366/LT1367 LT1368/LT1369 Typical Performance Characteristics (The data presented here applies to the LT1366/LT1367/LT1368/LT1369 unless otherwise noted.) Large-Signal Response (LT1366/LT1367) THD + Noise vs Frequency 0.1 5mV/DIV VS = ±1.5V VIN = 2VP-P RL = 10k 5V/DIV THD + NOISE (%) 1 Small-Signal Response (LT1366/LT1367) 0V AV = 1 0.01 AV = –1 VS = ±15V UNITY GAIN 0.001 0.01 0.
PAGE 12
LT1366/LT1367 LT1368/LT1369 Applications information The collector currents of the two input pairs are combined in the second stage, consisting of Q7 through Q11. Most of the voltage gain in the amplifier is contained in this stage. Differential amplifier Q14/Q15 buffers the output of the second stage, converting the output voltage to differential currents. The differential currents pass through current mirrors D4/Q17 and D5/Q16, and are converted to differential voltages by Q18 and Q19.
PAGE 13
LT1366/LT1367 LT1368/LT1369 Applications information Improved Supply Rejection in the LT1368/LT1369 The LT1368/LT1369 are variations of the LT1366/LT1367 offering greater supply rejection and lower high frequency output impedance. The LT1368/LT1369 require a 0.1µF load capacitance for compensation. The output capacitance forms a filter, which reduces pickup from the supply and lowers the output impedance.
PAGE 14
LT1366/LT1367 LT1368/LT1369 TYPICAL APPLICATIONS Precision Low Dropout Regulator Microprocessors and complex digital circuits frequently specify tight control of power supply characteristics. The circuit shown in Figure 6 provides a precise 3.6V, 1A output from a minimum 3.8V input voltage. The circuit’s nominal operating voltage is 4.75V ±5%. The voltage reference and resistor ratios determine output voltage accuracy, while the LT1366’s high gain enforces 0.2% line and load regulation.
PAGE 15
LT1366/LT1367 LT1368/LT1369 TYPICAL APPLICATIONS High Side Current Source The wide compliance current source shown in Figure 7 takes advantage of the LT1366’s ability to measure small signals near the positive supply rail. The LT1366 adjusts Q1’s gate voltage to force the voltage across the sense resistor (RSENSE) to equal the voltage from the supply to the potentiometer’s wiper.
PAGE 16
LT1366/LT1367 LT1368/LT1369 TYPICAL APPLICATIONS the 2 op amp loop to create a negative summing junction at A1’s positive input1. The circuit has low sensitivities for center frequency and Q, which are set with the following equations: 2 = 1/(R1 • C1 • R2 • C2) ω0 10k V+ 2 – VIN 1 1/2 LT1366 3 + VOUT SIGNAL AMP where: R1 = 1/(ω0 • Q • C1) and R2 = Q/(ω0 • C2). 1M The DC bias applied to A2 and A4, half supply, is not needed when split supplies are available.
PAGE 17
LT1366/LT1367 LT1368/LT1369 package description N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP +.035 .325 –.015 8.255 .130 p .005 (3.302 p 0.127) .045 – .065 (1.143 – 1.651) .008 – .015 (0.203 – 0.381) 8 7 6 5 1 2 3 4 .255 p .015* (6.477 p 0.381) .120 (3.048) .020 MIN (0.508) MIN .018 p .003 .100 (2.54) BSC +0.889 –0.381 .400* (10.160) MAX N8 1002 (0.457 p 0.076) NOTE: 1.
PAGE 18
LT1366/LT1367 LT1368/LT1369 package description S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .337 – .344 (8.560 – 8.738) NOTE 3 .045 p.005 .050 BSC 14 N 12 11 10 9 8 N .245 MIN .160 p.005 .228 – .244 (5.791 – 6.197) 1 .030 p.005 TYP 13 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 s 45o (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 1 2 3 4 5 .053 – .069 (1.346 – 1.752) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.
PAGE 19
LT1366/LT1367 LT1368/LT1369 Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 03/10 Change to Absolute Maximum Ratings Updated Format of Order Information Section Change to Electrical Characteristics Note 2 2 3, 4, 5, 6, 7 1366fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 20
LT1366/LT1367 LT1368/LT1369 Typical Application Instrumentation Amplifier V+ 0.1µF + 10M GUARD 1/4 LT1367 A1A – RF 102k + RG 11.3k + + 1/4 LT1367 A1C 1/4 LT1367 A1B 200Ω INPUTS 100k 10k OUTPUT – – 10M – 10M 22pF GUARD – ( ) 1/4 LT1367 A1D R GAIN = 10 1 + F = 100 RG RG 11.