COS8092MR

COS8091/8092/8094 350MHz, Rail-to-Rail Input/Output High Speed Operational Amplifiers Features General Description ■ 350MHz @ -3dB bandwidth ■ Operates on 2.5V ~ 5.5V Supplies The COS8091(single), COS8092(dual) and ■ Slew Rate: 250V/µs COS8094(quad) are low cost, voltage feedback, ■ Rail-to-Rail Input and Output (RRIO) rail-to-rail ■ Low Quiescent Current: 4.5mA amplifiers operated on 2.5 to 5.5 supplies. They ■ Unity Gain Stable have bandwidth and slew rate typically found in ■ No Phase Reversal current ■ Extended Temperature Ranges bandwidth and fast slew rate make these From -40°C to +125°C amplifiers useful in many general-purpose, high Small Packaging speed applications. ■ input and output, high speed feedback amplifiers. The wide COS8091 available in SOT23-5/SOP-8 COS8092 available in SOP-8/MSOP-8 COS8094 available in SOP14/TSSOP14 Despite their low cost, the COS8091/2/4 family provide excellent overall performance and versatility. They have both rail-to-rail input and Applications output range. The output voltage swing extends to within 10 mV of each rail, providing the ■ Coaxial cable drivers maximum output dynamic range with excellent ■ Active filters overdrive ■ Video and Cameras COS8091/2/4 ■ CCD imaging systems electronics, such as cameras, video switchers, ■ Clock buffers or any high speed portable equipment. Low ■ Base stations distortion and fast settling make them ideal for ■ A-to-D Drivers active filter applications. recovery. family This useful makes for the video 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 COS8091/8092/8094 1. Pin Configuration and Functions COS8091 COS8091 COS8092 COS8094 Pin Functions Name Description Note A bypass capacitor of 0.1μF as close to the part as possible should be placed between power supply pins or between supply pins and ground. Negative power supply If it is not connected to ground, bypass it with a or ground capacitor of 0.1μF as close to the part as possible. Inverting input of the amplifier. Voltage range of this Negative input pin can go from -Vs -0.3V to +Vs + 0.3V. Non-inverting input of the amplifier. This pin has the Positive input same voltage range as –IN. The output voltage range extends to within millivolts Output of each supply rail. +Vs Positive power supply -Vs -IN +IN OUT NC No connection 2. Package and Ordering Information Model Channel COS8091 1 COS8092 2 COS8094 4 www.cosine-ic.com Order Number Package Package Option Marking Information COS8091TR SOT23-5 Tape and Reel, 3000 C8091 COS8091SR SOP-8 Tape and Reel, 3000 COS8091 COS8092SR SOP-8 Tape and Reel, 3000 COS8092 COS8092MR MSOP-8 Tape and Reel, 3000 COS8092 COS8094SR SOP-14 Tape and Reel, 3000 COS8094 COS8094TR TSSOP-14 Tape and Reel, 3000 COS8094 2 COS8091/8092/8094 3. Product Specification 3.1 Absolute Maximum Ratings (1) Parameter Power Supply: +Vs to -Vs Input Voltage Input Current (2) Storage Temperature Range Junction Temperature Operating Temperature Range ESD Susceptibility, HBM Rating Units 6 V -Vs -0.5V to +Vs + 0.5V V 10 mA -65 to 150 °C 150 °C -40 to 125 °C 2000 V (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. 3.2 Thermal Data Parameter Rating Unit Package Thermal Resistance 190 (SOT23-5) 206 (MSOP8) 155 (SOP8) 105 (TSSOP14) 82 (SOP14) °C/W Rating Unit 2.5V ~ 5.5V V Input common-mode voltage range -Vs ~ +Vs V Operating ambient temperature -40 to +85 °C 3.3 Recommended Operating Conditions Parameter DC Supply Voltage www.cosine-ic.com 3 COS8091/8092/8094 3.4 Electrical Characteristics (+VS=+5V, -VS=0, VCM=VS/2, TA=+25°C, RL=2kΩ to VS/2, unless otherwise noted) Parameter Symbol Conditions Min Typ Max Unit 2 10 mV Input Characteristics Input Offset Voltage VOS Input Offset Voltage Drift ΔVOS/ΔT Input Bias Current -40 to 125°C 10 μV/°C IB ±2.5 pA Input Offset Current IOS ±2.5 pA Common-Mode Voltage Range VCM Common-Mode Rejection Ratio CMRR VCM =0.1V to 11.9V 125 dB Open-Loop Voltage Gain AOL VO=0.2V to 11.8V 120 dB RL=10kΩ 10 mV RL=2kΩ 25 mV RL=150Ω 200 mV ISR Sourcing 110 mA ISK Sinking 120 mA -0.1 5.6 V Output Characteristics Output Voltage Swing from Rail Short-Circuit Current Power Supply Operating Voltage Range 2.5 5.5 V Power Supply Rejection Ratio PSRR VS = 2.5V to 5.5V 90 dB Quiescent Current / Amplifier IQ VS=5V 4.5 mA Gain Bandwidth Product GBWP G=+1 350 MHz Slew Rate SR G = +1 , 2V Output Step 250 V/μs Settling Time to 0.1% tS G = +1 , 2V Output Step 50 ns en f=1kHz 6 nV/√Hz Dynamic Performance Noise Performance Voltage Noise Density www.cosine-ic.com 4 COS8091/8092/8094 4.0 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 5 COS8091/8092/8094 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 COS8091/2/4 operates from a single +2.5V to +5.5V supply or dual ±1.25V to ±2.25V 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 6 COS8091/8092/8094 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 7 COS8091/8092/8094 5. Package Information 5.1 SOT23-5 (Package Outline Dimensions) 5.2 SOP8 (Package Outline Dimensions) www.cosine-ic.com 8 COS8091/8092/8094 5.3 MSOP8 (Package Outline Dimensions) 5.4 SOP14 (Package Outline Dimensions) www.cosine-ic.com 9 COS8091/8092/8094 5.5 TSSOP14 (Package Outline Dimensions) 6. Related Parts Part Number Description COS6041/2/4 24kHz, 0.5μA, RRIO Op Amps, 1.8 to 5.5V Supply COS1347/2347/4347 350kHz, 15μA, RRIO Op Amps, 1.8 to 5.5V Supply COS6001/2/4 1.5MHz, 50μA, RRIO Op Amps, 1.8 to 5.5V Supply COS1314/2314/4314 3MHz, 150μA, RRIO Op Amps, 1.8 to 5.5V Supply COS821/2/4 5MHz, 300μA, RRIO Op Amps, 1.8 to 5.5V Supply COS1374/2374/4374 7MHz, 500μA, RRIO Op Amps, 1.8 to 5.5V Supply COS721/2/4 10MHz, 650μA, RRIO Op Amps, 2.1 to 5.5V Supply COS1333/2333/4333 0.35MHz, 18μA, RRIO Op Amps, 1.8 to 5.5V Supply, Zero Drift, Vos