Datasheet

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LTC1152

Rail-to-Rail Input

Rail-to-Rail Output

Zero-Drift Op Amp

■

Input Common-Mode Range Includes Both Rails

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Output Swings Rail to Rail

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Output Will Drive 1k

Ω

Load

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No External Components Required

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Input Offset Voltage: 10µV Max

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Input Offset Drift: 100nV/°C Max

■

Minimum CMRR: 115dB

■

Supply Current: 3.0mA Max

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Shutdown Pin Drops Supply Current to 5µA Max

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Output Configurable to Drive Any Capacitive Load

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Operates from 2.7V to 14V Total Supply Voltage

■

Rail-to-Rail Amplifiers and Buffers

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High Resolution Data Acquisition Systems

■

Supply Current Sensing in Either Rail

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Low Supply Voltage Transducer Amplifiers

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High Accuracy Instrumentation

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Single Negative Supply Operation

ESCRIPTIO

The LTC

1152 is a high performance, low power zero-drift

op amp featuring an input stage that common modes to

both power supply rails and an output stage that provides

rail-to-rail swing, even into heavy loads. The wide input

common-mode range is achieved with a high frequency

on-board charge pump. This technique eliminates the

crossover distortion and limited CMRR imposed by com-

peting technologies. The LTC1152 is a C-Load

of amp,

enabling it to drive any capacitive load.

The LTC1152 shares the excellent DC performance specs

of LTC’s other zero-drift amplifiers. Typical offset voltage

is 1µV and typical offset drift is 10nV/°C. CMRR and PSRR

are 130dB and 120dB and open-loop gain is 130dB. Input

noise voltage is 2µV

P-P

from 0.1Hz to 10Hz. Gain-band-

width product is 0.7MHz and slew rate is 0.5V/µs, all with

supply current of 3.0mA max over temperature. The

LTC1152 also includes a shutdown feature which drops

supply current to 1µA and puts the output stage in a high

impedance state.

The LTC1152 is available in 8-pin PDIP and 8-pin SO

packages and uses the standard op amp pinout, allowing

it to be a plug-in replacement for many standard op amps.

1152 TA02

Input and Output Waveforms

Rail-to-Rail Buffer

OUT

2V/DIV

ITY

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

C-Load is trademark of Linear Technology Corporation.

–

OUT

LTC1152

1152 TA01

Summary of content (8 pages)

PAGE 1
LTC1152 Rail-to-Rail Input Rail-to-Rail Output Zero-Drift Op Amp U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Input Common-Mode Range Includes Both Rails Output Swings Rail to Rail Output Will Drive 1kΩ Load No External Components Required Input Offset Voltage: 10µV Max Input Offset Drift: 100nV/°C Max Minimum CMRR: 115dB Supply Current: 3.0mA Max Shutdown Pin Drops Supply Current to 5µA Max Output Configurable to Drive Any Capacitive Load Operates from 2.
PAGE 2
LTC1152 U U RATI GS W W W W AXI U U ABSOLUTE PACKAGE/ORDER I FOR ATIO Total Supply Voltage (V + to V –) ............................. 14V Input Voltage ............................ V + + 0.3V to V – – 0.3V Output Short-Circuit Duration (Pin 6) ............. Indefinite Operating Temperature Range LTC1152C............................................... 0°C to 70°C LTC1152I.......................................... – 40°C to 85°C Storage Temperature Range ................
PAGE 3
LTC1152 ELECTRICAL CHARACTERISTICS VS = 3V, TA = operating temperature range, unless otherwise specified. SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS TA = 25°C (Note 1) ∆VOS Average Input Offset Drift (Note 1) IB Input Bias Current TA = 25°C (Note 2) MIN ● TYP ±1 MAX ±10 UNITS µV ±10 ±100 nV/°C ±5 ±100 ±1000 pA pA ±10 ±200 ±500 pA pA ● IOS Input Offset Current TA = 25°C (Note 2) ● en Input Noise Voltage (Note 3) RS = 100Ω, 0.1Hz to 10Hz RS = 100Ω, 0.1Hz to 1Hz 2 0.
PAGE 4
LTC1152 U W TYPICAL PERFORMANCE CHARACTERISTICS Common-Mode Range vs Supply Voltage Supply Current vs Supply Voltage VS = 5V TA = 25°C 2 0 –2 –4 POWER SUPPLY CURRENT (mA) 4 SUPPLY CURRENT (mA) 2.5 2.0 1.5 –6 6 3 4 5 2 POWER SUPPLY VOLTAGE (±V) 1 1.0 7 0 2 6 8 10 12 4 TOTAL SUPPLY VOLTAGE (V) 1152 G01 OUTPUT SHORT-CIRCUIT CURRENT (mA) OUTPUT SWING (±V) VS = SINGLE 5V 4 VS = SINGLE 3V VS = ±2.5V 2 VS = ±1.
PAGE 5
LTC1152 U W TYPICAL PERFORMANCE CHARACTERISTICS Gain and Phase Shift vs Frequency Common-Mode Rejection Ratio vs Frequency PHASE 40 80 60 GAIN 30 40 20 20 10 0 PHASE SHIFT (DEG) VOLTAGE GAIN (dB) 50 100 0 –10 COMMON-MODE REJECTION RATIO (dB) 60 10k 100k 1M FREQUENCY (Hz) TA = 25°C VS = ±2.5V 100 90 80 70 60 50 40 30 0.1 –20 1k 80 110 120 TA = 25°C VS = ±2.5V PIN 5 = NC 10M 10 100 FREQUENCY (kHz) TA = 25°C VS = ±2.
PAGE 6
LTC1152 U W U UO APPLICATI S I FOR ATIO VCC (PIN 7) Rail-to-Rail Operation The LTC1152 is a rail-to-rail input common-mode range, rail-to-rail output swing op amp. Most CMOS op amps, including the entire LTC zero-drift amplifier line, and even a few bipolar op amps, can and do, claim rail-to-rail output swing. One obvious use for such a device is to provide a unity-gain buffer for 0V to 5V signals running from a single 5V power supply.
PAGE 7
LTC1152 W U U UO APPLICATI S I FOR ATIO Compensation/Bandwidth Limiting The LTC1152 is unity-gain stable with capacitive loads up to 1000pF. Larger capacitive loads can be driven by externally compensating the LTC1152. Adding 1000pF between COMP (pin 5) and OUT (pin 6) allows capacitive loading of up to 1µF; 0.1µF between pins 5 and 6 allows the LTC1152 to drive infinite capacitive load (Figure 3).
PAGE 8
LTC1152 W U U UO APPLICATI S I FOR ATIO High Gain Amplifier with ±1.5V Supplies 10Ω High Precision Three-Input MUX 1.5V 100k 1.1k 10k SEL1 2 2 7 – 6 LTC1152 IN 3 + 3 IN 1 AV = 10 AV = 10k = 80dB 10Ω –1.5V 6 LTC1152 OUT 0.1µF 4 1 – + 10k OUT 1152 TA03 SEL2 2 High-Side Power Supply Current Sensing – 1 6 LTC1152 CHANGE SENSE RESISTOR TO CHANGE SENSITIVITY 0.01Ω 5V 0.