Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Op-amp Multi-purpose SO 8

LT1636

1636fc

Over-The-Top

Micropower Rail-to-Rail

Input and Output Op Amp

■

Rail-to-Rail Input and Output

■

Micropower: 50µA I

, 44V Supply

■

Operating Temperature Range: – 40°C to 125°C

■

Over-The-Top

: Input Common Mode Range

Extends 44V Above V

, Independent of V

■

Low Input Offset Voltage: 225µV Max

■

Specified on 3V, 5V and ±15V Supplies

■

High Output Current: 18mA

■

Output Shutdown

■

Output Drives 10,000pF with Output Compensation

■

Reverse Battery Protection to 27V

■

High Voltage Gain: 2000V/mV

■

High CMRR: 110dB

■

220kHz Gain-Bandwidth Product

■

8-Lead DFN, MSOP, PDIP and SO Packages

The LT

1636 op amp operates on all single and split supplies

with a total voltage of 2.7V to 44V drawing less than 50µA of

quiescent current. The LT1636 can be shut down, making the

output high impedance and reducing the quiescent current to

4µA. The LT1636 has a unique input stage that operates and

remains high impedance when above the positive supply. The

inputs take 44V both differential and common mode, even

when operating on a 3V supply. The output swings to both

supplies. Unlike most micropower op amps, the LT1636 can

drive heavy loads; its rail-to-rail output drives 18mA. The

LT1636 is unity-gain stable into all capacitive loads up to

10,000pF when a 0.22µF and 150Ω compensation network

is used.

The LT1636 is reverse supply protected: it draws no current

for reverse supply up to 27V. Built-in resistors protect the

inputs for faults below the negative supply up to 22V. There

is no phase reversal of the output for inputs 5V below V

44V above V

, independent of V

The LT1636 op amp is available in the 8-pin MSOP, PDIP and

SO packages. For space limited applications the LT1636 is

available in a 3mm × 3mm × 0.8mm dual fine pitch leadless

package (DFN).

Over-The-Top is a registered trademark of Linear Technology Corporation.

COMMON MODE VOLTAGE (V)

4.0

–10

INPUT BIAS CURRENT (nA)

5.210203040

5000

1636 G03

4.4 4.8 50

1000

3000

= 5V, 0V

= –55°C

= 125°C

= 25°C

Input Bias Current vs Common Mode Voltage

Over-The-Top Current Source with Shutdown

SHDN

OUT

LT1004-1.2

*OPTIONAL FOR LOW OUTPUT CURRENTS

4V TO

44V

TPO610

1636 TA01

–

LT1636

OUT

e.g., 10mA = 120Ω

1.2

■

Battery- or Solar-Powered Systems

Portable Instrumentation

Sensor Conditioning

■

Supply Current Sensing

■

Battery Monitoring

■

MUX Amplifiers

■

4mA to 20mA Transmitters

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.

Summary of content (16 pages)

PAGE 1
LT1636 Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Rail-to-Rail Input and Output Micropower: 50µA IQ, 44V Supply Operating Temperature Range: – 40°C to 125°C Over-The-Top®: Input Common Mode Range Extends 44V Above VEE, Independent of VCC Low Input Offset Voltage: 225µV Max Specified on 3V, 5V and ±15V Supplies High Output Current: 18mA Output Shutdown Output Drives 10,000pF with Output Compensation Reverse Battery Protection to 27V High
PAGE 2
LT1636 U W W W ABSOLUTE MAXIMUM RATINGS Total Supply Voltage (V + (Note 1) V –) to .............................. 44V Input Differential Voltage ......................................... 44V Input Current ...................................................... ±25mA Shutdown Pin Voltage Above V – ............................. 32V Shutdown Pin Current ....................................... ±10mA Output Short-Circuit Duration (Note 2) .........
PAGE 3
LT1636 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified.
PAGE 4
LT1636 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL GBW SR PARAMETER Gain Bandwidth Product (Note 5) Slew Rate (Note 7) CONDITIONS f = 1kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● ● ● LT1636C/LT1636I MIN TYP MAX 110 200 100 90 0.035 0.07 0.031 0.
PAGE 5
LT1636 ±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) SYMBOL PARAMETER ISC Short-Circuit Current (Note 2) PSRR Power Supply Rejection Ratio IS Supply Current LT1636C/LT1636I MIN TYP MAX CONDITIONS Short to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C VS = ±1.
PAGE 6
LT1636 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL IS ISD PARAMETER CONDITIONS Reverse Supply Voltage IS = – 100µA Supply Current (Note 6) MIN ● LT1636H TYP MAX 25 UNITS V 42 ● 55 75 µA µA Supply Current, SHDN VPIN5 = 2V, No Load (Note 6) ● 15 µA Shutdown Pin Current VPIN5 = 0.
PAGE 7
LT1636 ELECTRICAL CHARACTERISTICS sampled at these temperatures. The LT1636I is guaranteed to meet specified performance from – 40°C to 85°C. The LT1636H is guaranteed to meet specified performance from –40°C to 125°C. Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±15V or VS = ±22V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±15V or VS = ±22V tests.
PAGE 8
LT1636 U W TYPICAL PERFOR A CE CHARACTERISTICS Noise Voltage Density vs Frequency 0.1Hz to 10Hz Noise Voltage Input Noise Current vs Frequency 80 INPUT NOISE CURRENT DENSITY (pA/√Hz) NOISE VOLTAGE (400nV/DIV) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) VS = ± 2.5V 0.
PAGE 9
LT1636 U W TYPICAL PERFOR A CE CHARACTERISTICS Gain-Bandwidth Product and Phase Margin vs Load Resistance 400 70 350 60 300 50 250 40 200 30 150 20 OUTPUT IMPEDANCE (Ω) 1k PHASE MARGIN 35 VS = ± 2.5V AV = 100 100 AV = 10 10 AV = 1 100 20 15 10 1k 0.1 100 0 100k 10k LOAD RESISTANCE (Ω) 1k 10k FREQUENCY (Hz) 100 80 4 OVERSHOOT (%) AV = – 1 2 0 –2 AV = – 1 –4 AV = 1 –6 10 VS = 3V, 0V VOUT = 2VP-P VCM = 1.
PAGE 10
LT1636 U W TYPICAL PERFOR A CE CHARACTERISTICS CHANGE IN INPUT OFFSET VOLTAGE (100µV/DIV) Open-Loop Gain Large-Signal Response A B A: RL = 2k B: RL = 10k C: RL = 50k B C C Small-Signal Response A 1636 G24 1636 G25 VS = ±15V AV = –1 VS = ±15V AV = 1 1636 G26 U W 0V 10V VS = ±15V –10V OUTPUT VOLTAGE (5V/DIV) U U APPLICATIONS INFORMATION Supply Voltage The positive supply pin of the LT1636 should be bypassed with a small capacitor (about 0.01µF) within an inch of the pin.
PAGE 11
LT1636 U W U U APPLICATIONS INFORMATION The normally reverse biased substrate diode from the output to V – will cause unlimited currents to flow when the output is forced below V –. If the current is transient and limited to 100mA, no damage will occur. returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details. The LT1636 is internally compensated to drive at least 200pF of capacitance under any output loading conditions. A 0.
PAGE 12
LT1636 U TYPICAL APPLICATIONS MUX Amplifier Waveforms MUX Amplifier 5V + VIN1 LT1636 SHDN VOUT – 5V + VIN2 LT1636 SHDN – INPUT SELECT VS = 5V VIN1 = 1.2kHz AT 4VP-P, VIN2 = 2.4kHz AT 2VP-P INPUT SELECT = 120Hz AT 5VP-P 1636 TA05 74HC04 Optional Output Compensation for Capacitive Loads Greater Than 200pF VIN + LT1636 CL ≤ 10,000pF – 0.
PAGE 13
LT1636 W W SI PLIFIED SCHEMATIC 7 V+ Q1 Q13 D1 – IN SHDN 2µA Q25 Q23 R3 1k R2 30k 5 Q19 D2 2 Q2 R1 1M D3 Q21 R4 1k + IN Q9 Q10 Q14 Q15 Q18 Q20 Q24 6 OUT Q22 3 Q11 Q12 Q17 Q16 Q26 Q3 Q4 Q5 Q6 Q7 Q8 D4 D5 NULL R5 40k R6 40k R7 300Ω R8 300Ω 1 8 NULL 4 V– 1636 SS 1636fc 13
PAGE 14
LT1636 U PACKAGE DESCRIPTION DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5 0.38 ± 0.10 8 0.675 ±0.05 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 1.65 ± 0.10 (2 SIDES) 3.00 ±0.10 (4 SIDES) PIN 1 TOP MARK PACKAGE OUTLINE (DD8) DFN 0203 0.28 ± 0.05 4 0.28 ± 0.05 0.75 ±0.05 0.200 REF 0.50 BSC 2.38 ±0.05 (2 SIDES) 1 0.50 BSC 2.38 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD NOTE: 1.
PAGE 15
LT1636 U PACKAGE DESCRIPTION N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) .100 (2.54) BSC N8 1002 NOTE: 1.
PAGE 16
LT1636 U TYPICAL APPLICATIONS Self-Buffered Micropower Reference Over-The-Top Comparator with Hysteresis 1M 4V TO 44V 3V TO 44V 10k IN1 (0V TO 44V) + – VOUT LT1636 – VOUT = 1.25V IOUT ≤ 10mA LT1636 + 1M 1N5711 1M 2N5087 10k IN2 (0V TO 44V) 1M 1M 0.1µF 2N5210 V HYSTERESIS = CC 100 1636 TA04 1636 TA03 Lamp Outage Detector Over-The-Top Current Sense 5V TO 44V R1 200Ω 3V 5V TO 44V 1M LAMP ON/OFF LT1634-1.25 100k 5k 5V – 0.5Ω OUT LT1636 RS 0.2Ω + LT1636 + VOUT (0V TO 4.