COS5532MR

COS5532 36V, 10MHz Low-Noise Dual Operational Amplifiers Features General Description ■ Operates on ±2.5V to ±18V Supplies The COS5532 are high performance, low ■ Gain Bandwidth Product: 10MHz noise ■ Power Bandwidth: 140kHz excellent dc and ac characteristics. They ■ Slew Rate: 8V/µs feature very low noise, high output-drive ■ Offset Voltage: 5mV (Max.) capability, ■ Quiescent Current: 2.8mA ■ ■ ■ operational amplifiers high combining unity-gain and maximum-output-swing bandwidths, low Output Drive Capability: 2kΩ, 10Vrms typ distortion, rate, Extended Temperature Ranges short-circuit protection. These operational From -40°C to +125°C amplifiers are compensated internally for Available in SOP-8/MSOP-8/DIP-8 unity-gain operation and can operate from high slew and output ±2.5 to ±18V dual power supplies or from +5V to +36V single supplies. Applications ■ Precision Instrumentation ■ Professional Audio ■ DAC Output Amplifier ■ Active Filters ■ Low Noise Amplifier Front End Pin Configuration Rev1.0 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 1 COS5532 1. Product Specification 1.1 Absolute Maximum Ratings (1) Parameter Rating Units Power Supply: +Vs to -Vs 36 V Differential Input Voltage Range ±30 V Input Voltage (any input) ±15 V Output Current 50 mA -65 to 150 °C 150 °C -40 to 125 °C 2000 V Storage Temperature Range Junction Temperature Operating Temperature Range ESD Susceptibility, HBM (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. 1.2 Thermal Data Parameter Rating Unit Package Thermal Resistance 155 (SOP8) 206 (MSOP8) 125 (DIP8) °C/W Rating Unit DC Supply Voltage ±2.5V ~ ±18V V Input common-mode voltage range -Vs+2 ~ +Vs-2 V -40 to +85 °C 1.3 Recommended Operating Conditions Parameter Operating ambient temperature www.cosine-ic.com 2 COS5532 1.4 Electrical Characteristics (+VS=+15V, -VS=-15V, TA=+25°C, RL=10kΩ to VS/2, unless otherwise noted) Parameter Symbol Conditions Min Typ Max Unit 0.5 5 mV Input Characteristics Input Offset Voltage VOS Input Offset Voltage Drift ΔVOS/ΔT Input Bias Current IB 200 800 nA Input Offset Current IOS 50 200 nA Common-Mode Voltage Range VCM ±13 V Common-Mode Rejection Ratio CMRR Open-Loop Voltage Gain AOL -40 to 125°C 2 μV/°C Rs≤10kΩ 70 100 dB RL ≥ 10kΩ, VO = ±10V 88 110 dB RL ≥ 2kΩ, VO = ±10V 82 94 dB RL ≥2kΩ ±12 ±13 V 60 mA Output Characteristics Output Voltage Swing VO(PP) Short-Circuit Current ISC Power Supply Operating Voltage Range ±2.5 Power Supply Rejection Ratio PSRR Quiescent Current / Amplifier IQ Rs≤10kΩ 80 ±18 110 2.8 V dB 3.5 mA Dynamic Performance Gain Bandwidth Product GBWP CL=100pF, RL=2kΩ 10 MHz Slew Rate SR CL=100pF, RL=2kΩ, Av=1 8.0 V/μs en f=1kHz 5.0 nV/√Hz Noise Performance Voltage Noise Density www.cosine-ic.com 3 COS5532 2.0 Application Notes Driving Capacitive Loads Driving large capacitive loads can cause stability problems for voltage feedback op amps. As the load capacitance increases, the feedback loop’s phase margin decreases, and the closed loop bandwidth is reduced. This produces gain peaking in the frequency response, with overshoot and ringing in the step response. A unity gain buffer (G = +1) is the most sensitive to capacitive loads, but all gains show the same general behavior. When driving large capacitive loads with these op amps (e.g., > 100 pF when G = +1), a small series resistor at the output (RISO in Figure 1) improves the feedback loop’s phase margin (stability) by making the output load resistive at higher frequencies. It does not, however, improve the bandwidth. To select RISO, check the frequency response peaking (or step response overshoot) on the bench. If the response is reasonable, you do not need RISO. Otherwise, start RISO at 1 kΩ and modify its value until the response is reasonable. RISO VOUT VIN CL Figure 1. Indirectly Driving Heavy Capacitive Load An improvement circuit is shown in Figure 2. It provides DC accuracy as well as AC stability. RF provides the DC accuracy by connecting the inverting signal with the output, CF and RISO serve to counteract the loss of phase margin by feeding the high frequency component of the output signal back to the amplifier’s inverting input, thereby preserving phase margin in the overall feedback loop. Figure 2. Indirectly Driving Heavy Capacitive Load with DC Accuracy www.cosine-ic.com 4 COS5532 For noninverting configuration, there are two others ways to increase the phase margin: (a) by increasing the amplifier’s gain or (b) by placing a capacitor in parallel with the feedback resistor to counteract the parasitic capacitance associated with inverting node, as shown in Figure 3. Figure 3. Adding a Feedback Capacitor in the Noninverting Configuration Power-Supply Bypassing and Layout The COS5532 operates from a single +5V to +36V supply or dual ±2.5V to ±18V supplies. For single-supply operation, bypass the power supply +Vs with a 0.1μF ceramic capacitor which should be placed close to the +Vs pin. For dual-supply operation, both the +Vs and the -Vs supplies should be bypassed to ground with separate 0.1μF ceramic capacitors. 2.2μF tantalum capacitor can be added for better performance. The length of the current path is directly proportional to the magnitude of parasitic inductances and thus the high frequency impedance of the path. High speed currents in an inductive ground return create an unwanted voltage noise. Broad ground plane areas will reduce the parasitic inductance. Thus a ground plane layer is important for high speed circuit design. Typical Application Circuits Differential Amplifier The circuit shown in Figure 4 performs the differential function. If the resistors ratios are equal (R4 / R3 = R2 / R1), then VOUT = (VIP – VIN) × R2 / R1 + VREF. www.cosine-ic.com 5 COS5532 Figure 4. Differential Amplifier Low Pass Active Filter When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often required. The simplest way to establish this limited bandwidth is to place an RC filter at the noninverting terminal of the amplifier. If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this task, as Figure 5. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth. Failure to follow this guideline can result in reduction of phase margin. The large values of feedback resistors can couple with parasitic capacitance and cause undesired effects such as ringing or oscillation in high-speed amplifiers. Keep resistors value as low as possible and consistent with output loading consideration. Figure 5. Two-Pole Low-Pass Sallen-Key Active Filter www.cosine-ic.com 6 COS5532 3. Package Information 3.1 SOP8 (Package Outline Dimensions) 3.2 MSOP8 (Package Outline Dimensions) www.cosine-ic.com 7 COS5532 3.3 DIP8 (Package Outline Dimensions) 4. Package and Ordering Information Model COS5532 Channel 2 Order Number Package Package Option Marking Information COS5532SR SOP-8 Tape and Reel, 3000 COS5532SR COS5532MR MSOP-8 Tape and Reel, 3000 COS5532MR COS5532DR DIP-8 Tape and Reel, 1500 COS5532DR COS5532DT DIP-8 Tube, 50 COS5532DT 5. Related Parts Part Number Description COS1177/2177/4177 36V high precision Op Amps, 5 to 36V Supply, Vos