COS128UA

COS128, COS129 36V, Precision Low-Power Instrumentation Amplifier Features General Description ■ Low Offset Voltage: 50µV (Max.) COS128 and COS129 are low-power, general ■ Low Drift: 0.2µV/ºC purpose instrumentation amplifiers offering ■ Low Input Bias Current: 2nA (Max.) excellent accuracy. The versatile 3-op amp ■ Gain Bandwidth Product: 1.5MHz design and small size make these amplifiers ■ Slew Rate: 1.0V/µs ideal for a wide range of applications. A single ■ Wide Supply Range：±2.25V ~ ±18V external resistor sets any gain from 1 to 10,000. ■ Low Quiescent Current: 1.0mA ■ Unity Gain Stable COS128 and COS129 are laser-trimmed for ■ Input Over-Voltage Protection very low offset voltage (50µV), drift (0.2µV/ºC) ■ Extended Temperature Ranges and high common mode rejection. They From -40°C to +125°C operate with power supplies as low as ±2.25. Available as SOP8/MSOP8/DIP8 The quiescent current is only 1.0mA, ideal for ■ battery-operated systems. COS128/129 are Applications ■ Medical Instrumentation ■ RTD Sensor Amplifier ■ Data Acquisition ■ Thermocouple Amplifier ■ Bridge Amplifier available in 8-pin plastic SOP8, DIP8 and MSOP8 packages, specified for the -40 ºC to +125 ºC temperature range. Rev1.1 Copyright@2018 Cosine Nanoelectronics Inc. All rights reserved The information provided here is believed to be accurate and reliable. Cosine Nanoelectronics assumes no reliability for inaccuracies and omissions. Specifications described and contained here are subjected to change without notice on the purpose of improving the design and performance. All of this information described herein should not be implied or granted for any third party. www.cosine-ic.com Block Diagram 1 COS128，COS129 1. Pin Configuration and Functions Pin Functions Pin Name I/O Description 1,8 RG - Cain setting pin. For gains greater than 1, place a gain resistor between pin1 & 8 2 Vin- I Negative input 3 Vin+ I Positive input 4 V- P Negative supply 5 Ref I Reference input. This Pin must be driven by low impedance or connected to ground 6 Vo O Output 7 V+ P Positive supply 2. Product Specification 2.1 Absolute Maximum Ratings (1,2) Parameter Rating Units Power Supply: +Vs to -Vs 36 V Differential Input Voltage Range ±36 V -Vs to +Vs V 50 mA -65 to 150 °C 150 °C -40 to 125 °C 2000 V Common Mode Input voltage Range(2) Output Current Storage Temperature Range Junction Temperature Operating Temperature Range ESD Susceptibility, HBM www.cosine-ic.com 2 COS128，COS129 (1) Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. (2) Input terminals are diode-clamped to the power-supply rails. Input signals that can swing more than 0.5V beyond the supply rails should be current-limited to 10mA or less. 2.2 Thermal Data Parameter Rating Unit Package Thermal Resistance 206 (MSOP8) 155 (SOP8) 46 (DIP8) °C/W Rating Unit ±2.5V ~ ±18V V -Vs+1.9 ~ +Vs-1.2 V -40 to +125 °C 2.3 Recommended Operating Conditions Parameter DC Supply Voltage Input common-mode voltage range Operating ambient temperature 2.4 Electrical Characteristics (+VS=+15V, -VS=-15V, TA=+25°C, RL=10kΩ, unless otherwise noted) Parameter Symbol Conditions Min Typ Max Unit COS128U/129U ±10 ±50 μV COS128UA/129UA ±25 ±125 μV -40 to 125°C 0.2 0.7 μV/°C Input Characteristics Input Offset Voltage VOS Input Offset Voltage Drift ΔVOS/ΔT Input Bias Current IB ±0.5 ±2 nA Input Offset Current IOS ±0.2 ±1 nA Common-Mode Voltage Range VCM +VS-1.2 V Common-Mode Rejection Ratio CMRR Open-Loop Voltage Gain AOL www.cosine-ic.com -VS+1.9 RL ≥ 2kΩ, VO = ±10V 120 125 dB 100 120 dB 3 COS128，COS129 Output Characteristics Output Voltage High VOH Output Voltage Low VOL Output Current IOUT Short-Circuit Current ISC +VS-1.1 -VS+0.9 VDROPOUT < 1.2 V V V ±10 mA ±24 mA Power Supply Operating Voltage Range ±2.25 Power Supply Rejection Ratio PSRR Quiescent Current / Amplifier IQ 120 ±18 130 1.0 V dB 1.3 mA Dynamic Performance Gain Bandwidth Product GBWP CL=100pF, RL=10kΩ 1.5 MHz Slew Rate SR CL=100pF, RL=10kΩ, Av=1 1.0 V/μs en f=1kHz 8.0 nV/√Hz Noise Performance Voltage Noise Density 3.0 Application Notes 3.1 Overview The COS128/129 instrumentation amplifiers are differential amplifier that has been outfitted with input protection circuit and input buffer amplifiers, which eliminate the need for input impedance matching and make the amplifier particularly suitable for use in measurement and test equipment. Additional characteristics of the COS128/129 include a very low DC offset, low drift, low noise, very high open-loop gain, very high common-mode rejection ratio, and very high input impedance. 3.2 Application Information COS128/129 measure small differential voltage with high common-mode voltage developed between the noninverting and inverting input. The ability to set the reference pin to adjust the functionality of the output signal offers additional flexibility that is practical for multiple configurations. www.cosine-ic.com 4 COS128，COS129 Figure 3.1 shows the basic connections required for operation of the COS128/129. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. This must be a low-impedance connection to assure good common-mode rejection. A resistance of 8Ω in series with the REF pin will cause a typical device to degrade to approximately 80dB CMR. Figure 3.1 Functional Block Diagram Gain is set by connecting a single external resistor, RG, between pins 1 and 8: G www.cosine-ic.com = 1+2*R1/RG =1 + 50 kΩ/RG for COS128 =1 + 49.4 kΩ/RG for COS129 5 COS128，COS129 Commonly used gains and resistor values are shown in Table 3.1. Desired Gain G(V/V) 1 2 5 10 20 50 100 200 500 1000 2000 5000 10000 COS128: G=1 + 50 kΩ/RG Nearest RG(Ω) 1% RG(Ω) NC 50k 12.5k 5.556k 2.632k 1.02k 505.1 251.3 100.2 50.05 25.01 10.00 5.001 NC 49.9k 12.4k 5.62k 2.61k 1.02k 511 249 100 49.9 24.9 10 4.99 COS129: G=1 + 49.4 kΩ/RG Nearest RG(Ω) 1% RG(Ω) NC 49.4k 12.35k 5489 2600 1008 499 248 99 49.5 24.7 9.88 4.94 NC 49.9k 12.4k 5.49k 2.61k 1k 499 249 100 49.9 24.9 9.76 4.87 Table 3.1 Required Values of Gain Resistors 4. Package and Ordering Information Model COS128 COS129 www.cosine-ic.com Order Number Package Package Option Marking Information COS128U SOP-8 Tape and Reel, 4000 COS128U COS128UA SOP-8 Tape and Reel, 4000 COS128UA COS128P DIP-8 Tube, 50 COS128P COS128PA DIP-8 Tube, 50 COS128PA COS129U SOP-8 Tape and Reel, 4000 COS129U COS129UA SOP-8 Tape and Reel, 4000 COS129UA COS129P DIP-8 Tube, 50 COS129P COS129PA DIP-8 Tube, 50 COS129PA 6 COS128，COS129 5. Package Information 5.1 SOP8 (Package Outline Dimensions) 5.2 DIP8 (Package Outline Dimensions) www.cosine-ic.com 7