UNISONIC TECHNOLOGIES CO., LTD LV2622 Preliminary LINEAR INTEGRATED CIRCUIT 250μA, 3MHZ, LOW VOLTAGE RAIL-TO-RAIL I/O CMOS DUAL OP AMPS DESCRIPTION SOP-8 The UTC LV2622 is low noise, low voltage and low power dual operational amplifiers that can be designed into a wide range of applications. With a 3MHz unity-gain frequency and a guaranteed 1.7V/μs slew rate, the quiescent current is only 250μA/amplifier (5.0V). The UTC LV2622 provides rail-to-rail output swing into heavy loads. The input common-mode voltage range includes ground and the maximum input offset voltage is 3mV. It is specified over the extended industrial temperature range (−40°C~+125°C). The operating range is 2.5V~5.5V. The UTC LV2622 provides optimal performance in low voltage and low noise systems. FEATURES * Low Cost * Rail-to-Rail Output Swing * Input Rail: - 0.1V~+5.6V with VS=5.5V * Typical VOS: 0.7mV * Gain-Bandwidth Product: 3MHz * High Slew Rate: 1.7V/µs * Settling Time to 0.1% with 2V Step: 2.1µs * Overload Recovery Time: 1µs * Low Noise Voltage: 12nV/ Hz * Operates on 2.5V~5.5V Supplies * Low Power: 250µA/Amplifier Typical Supply Current ORDERING INFORMATION Ordering Number Lead Free LV2622L-S08-R LV2622L-S08-T Halogen Free LV2622G-S08-R LV2622G-S08-T Package Packing SOP-8 SOP-8 Tape Reel Tube LV2622L-S08-R (1)Packing Type (1) R: Tape Reel, T: Tube (2)Package Type (2) S08: SOP-8 (4)Lead Free (3) G: Halogen Free, L: Lead Free www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd 1 of 8 QW-R102-045.a LV2622 Preliminary LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION OUT A 1 8 +VS -IN A 2 7 OUT B +IN A 3 6 -IN B -VS 4 5 +IN B BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R102-045.a LV2622 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=+25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage, V+~VVS 7.5 V Common-Mode Input Voltage VCM (-Vs)-0.5~(+Vs)+0.5 V Junction Temperature TJ 160 °C Operating Temperature TOPR -40~+150 °C Storage Temperature TSTG -65~+150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER Junction to Ambient @ TA=25°C SYMBOL θJA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw RATINGS 160 UNIT °C/W 3 of 8 QW-R102-045.a LV2622 Preliminary LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS(TA=+25°C,VS=5V,VCM=VS/2,RL=600Ω, unless otherwise specified) PARAMETER INPUT CHARACTERISTICS SYMBOL Input Offset Voltage VOS Input Bias Current Input Offset Current Common-Mode Voltage Range IB IOS VCM Common-Mode Rejection Ratio CMRR Open-Loop Voltage Gain AOL Input Offset Voltage Drift OUTPUT CHARACTERISTICS ΔVOS/ΔT Output Voltage Swing from Rail VO Output Current IOUT Closed-Loop Output Impedance POWER SUPPLY RO Operating Voltage Range VS Power Supply Rejection Ratio PSRR Quiescent Current/ Amplifier IQ DYNAMIC PERFORMANCE Gain-Bandwidth Product Phase Margin Full Power Bandwidth Slew Rate Settling Time To 0.1% Overload Recovery Time NOISE PERFORMANCE GBP φO BWP SR tS tOR Voltage Noise Density eN TEST CONDITIONS MIN TYP MAX UNIT 0.7 3 3.5 mV (Note) VS=5.5V VS=5.5V, VCM=-0.1V~4V (Note) VS=5.5V, VCM=-0.1V~5.6V (Note) RL=600Ω, Vo=0.15V~4.85V (Note) RL=10KΩ, Vo=0.05V~4.95V (Note) 75 73 66 64 92 78 100 82 2.7 RL=600Ω RL=10KΩ 45 30 (Note) F=100KHz, G=+1 (Note) VS=+2.5V~+5.5V, VCM=(-VS)+0.5V IOUT=0 1 1 -0.1~+5.6 90 dB 92 dB 100 dB 110 dB μV/°C 0.1 0.015 48 V mA 2.6 (Note) 2.5 2.5 79 76 94 250 (Note) RL=10KΩ Ω 5.5 5.5 V dB 400 480 μA <1% distortion, RL=600Ω G=+1, 2V Step, RL=10KΩ G=+1, 2V Step, RL=600Ω VIN · Gain=Vs, RL=600Ω 3 67 50 1.7 2.1 1 MHz degrees KHz V/μs μs μs f=1kHz 12 nV/ Hz Current Noise Density IN f=1kHz 3 Note: Denotes the specifications which apply over the operating temperature range (-40°C~125°C). UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw pA pA V fA/ Hz 4 of 8 QW-R102-045.a LV2622 Preliminary LINEAR INTEGRATED CIRCUIT APPLICATION NOTES Driving a Capacitive Load The UTC LV2622 can directly drive 1000pF in unity-gain without oscillation. The unity-gain follower (buffer) is the most sensitive configuration to capacitive loading. When the amplifier is configured in this manner, capacitive loading directly on the output will decrease the device’s phase margin leading to high frequency ringing or oscillations. It is recommended that an isolation resistor (RISO) is placed in series with the output of the amplifier when the greater capacitive load is required. The circuit is shown in Figure 1. The RISO and the load capacitor CL form a zero to increase stability, but this method results in a loss of gain accuracy for RISO dividing the voltage with RLOAD. The circuit in Figure 2 provides DC accuracy and AC stability. To increase the DC accuracy, RF should be connected between the inverting input and the output. To preserve the phase margin in the overall feedback loop, CF is required and can compensate the loss of phase margin together with RIso by feeding the high frequency component of the output signal back to the amplifier’s inverting input . CF RF UTC LV2622 VIN + RISO VOUT 1/2 CL RL Figure 2. Indirectly Driving Heavy Capacitive Load with DC Accuracy For no-buffer 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 8 QW-R102-045.a LV2622 Preliminary LINEAR INTEGRATED CIRCUIT APPLICATION NOTES(Cont.) Power-Supply Bypassing and Layout The UTC LV2622 can apply for a single +2.5V~+5.5V supply or dual ±1.25V~±2.75V supplies. For single-supply operation, a 0.1µF ceramic capacitor should be placed close to the VDD pin to bypass the power supply VDD. For dual-supply operation, separate 0.1µF ceramic capacitors should be placed to the VDD and the VSS supplies to bypass them to ground, and 2.2µF tantalum capacitor for better performance. By decreasing the amount of stray capacitance at the op amp’s inputs and output, PC board l performance can be optimized. For example, placing external components as close to the device as possible can minimize trace lengths and widths. and using surface-mount components is a better way. For the operational amplifier, soldering the part to the board directly is strongly recommended. The EMI can be minimized because keeping the high frequency big current loop area small. Grounding A ground plane layer is important for UTC LV2622 circuit design. The length of the current path speed currents in an inductive ground return will create an unwanted voltage noise. Broad ground plane areas will reduce the parasitic inductance. Input-to-Output Coupling The input and output signal traces should not be parallel to minimize capacitive coupling. This helps reducing unwanted positive feedback. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R102-045.a LV2622 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUITS Figure 4 is the differential amplifier. If the resistors ratios are equal (R4/R3=R2/R1), then VOUT=(Vp-Vn)×R2/R1+Vref. Figure 5 performs the same function as that in Figure 4 but with the high input impedance. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 8 QW-R102-045.a LV2622 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUITS(Cont.) Figure 6 is the low pass filter. It’s DC gain is -R2/R1 and the –3dB corner frequency is 1/2πR2C. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 8 QW-R102-045.a