COS8221ARZ

COS8221 36V, Precision Low-Power Instrumentation Amplifier Features General Description ■ Low Offset Voltage: 50µV (Max.) COS8221 is a low-power, general purpose ■ Low Drift: 0.2µV/ºC instrumentation amplifiers offering excellent ■ Low Input Bias Current: 2nA (Max.) accuracy. The versatile 3-op amp design and ■ Gain Bandwidth Product: 1.5MHz small size make these amplifiers ideal for a ■ Slew Rate: 1.0V/µs wide range of applications. A single external ■ Wide Supply Range：±2.25V ~ ±18V resistor sets any gain from 1 to 10,000. ■ Low Quiescent Current: 1.0mA ■ Unity Gain Stable COS8221 is laser-trimmed for very low offset ■ Input Over-Voltage Protection voltage (50µV), drift (0.2µV/ºC) and high ■ Extended Temperature Ranges common mode rejection. It operates with power From -40°C to +125°C supplies as low as ±2.25. The quiescent current Available as SOP8/MSOP8/DIP8 is only 1.0mA, ideal for battery-operated ■ systems. COS8221 is available in 8-pin plastic Applications ■ Medical Instrumentation ■ RTD Sensor Amplifier ■ Data Acquisition ■ Thermocouple Amplifier ■ Bridge Amplifier SOP8, DIP8 and MSOP8 packages, specified for the -40 ºC to +125 ºC temperature range. +Vs 8 VIN- 1 Over-Voltage Protection + 20KΩ - 2 24KΩ 20KΩ - 7 RG 3 24KΩ VIN+ Rev1.0 Over-Voltage Protection + 48k RG VOUT + 4 G  1 6 20KΩ REF 20KΩ 5 -Vs 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 COS8221 1. Pin Configuration and Functions VIN- 1 8 +Vs RG 2 7 VOUT RG 3 6 REF VIN+ 4 5 -Vs COS8221 Pin Functions Pin Name I/O Description 1 VIN- I Negative input 2,3 RG - Cain setting pin. For gains greater than 1, place a gain resistor between pin 2 & 3 4 VIN+ I Positive input 5 -Vs P Negative supply 6 REF I Reference input. This Pin must be driven by low impedance or connected to ground 7 VOUT O Output 8 +Vs P Positive supply 2. Product Specification 2.1 Absolute Maximum Ratings (1,2) Parameter Power Supply: +Vs to -Vs Differential Input Voltage Range Common Mode Input voltage Range(2) Output Current Storage Temperature Range Junction Temperature Operating Temperature Range ESD Susceptibility, HBM www.cosine-ic.com Rating Units 36 V ±0.5 V -Vs to +Vs V 50 mA -65 to 150 °C 150 °C -40 to 125 °C 2000 V 2 COS8221 (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 ±2.3V ~ ±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 ±15 ±50 μV 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 -40 to 125°C -VS+1.9 RL ≥ 2kΩ, VO = ±10V 120 125 dB 100 120 dB Output Characteristics www.cosine-ic.com 3 COS8221 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 COS8221 instrumentation amplifier is a type of 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 COS8221 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 impedances. 3.2 Application Information COS8221 measures 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 COS8221 Figure 3.1 shows the basic connections required for operation of the COS8221. 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. G 1 48k RG Figure 3.1 Functional Block Diagram Gain is set by connecting a single external resistor, RG, connected between pins 1 and 8: (1) G = 1 + 48 kΩ/RG Commonly used gains and resistor values are shown in Table 3.1. Desired Gain (V/V) 1 2 5 10 www.cosine-ic.com RG(Ω) NC 48k 12k 5333.33 Nearest 1% RG(Ω) NC 48k 12k 5.36k 5 COS8221 20 50 100 200 500 1000 2000 5000 10000 2526.32 979.59 484.85 241.21 96.19 48.05 24.01 9.60 4.80 2.55k 976 487 243 95.3 47.5 24 9.53 4.75 Table 3.1 Required Values of Gain Resistors 4. Package and Ordering Information Model COS8221 Order Number Package Package Option Marking Information COS8221ARZ SOP-8 Tape and Reel, 3000 COS8221ARZ COS8221MR MSOP-8 Tape and Reel, 3000 COS8221MR COS8221DT DIP-8 Tube, 50 COS8221DT 5. Package Information 5.1 SOP8 (Package Outline Dimensions) www.cosine-ic.com 6 COS8221 5.2 MSOP8 (Package Outline Dimensions) 5.3 DIP8 (Package Outline Dimensions) www.cosine-ic.com 7