EC5759 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier General Description Features The EC5759 is a single supply, low power CMOS dual ● Single-Supply Operation from +2.2V ~ +5.5V operational amplifier; these amplifiers offer bandwidth of ● Rail-to-Rail Input / Output 1MHz, rail-to-rail inputs and outputs, and single-supply ● Gain-Bandwidth Product: 1MHz (Typ.) operation from 2.2V to 5.5V. Typical low quiescent supply ● Low Input Bias Current: 10pA (Typ.) current of 80μA in dual operational amplifier within one chip ● Low Offset Voltage: 5mV (Max.) and very low input bias current of 10pA make the devices ● Quiescent Current: 40μA per Amplifier (Typ.) an ideal choice for low offset, low power consumption and ● Operating Temperature: -40°C ~ +125°C high impedance applications such as smoke detectors, ● Available in SOP-8L and MSOP-8L Packages photodiode amplifiers, and other sensors. The EC5759 is available in SOP-8L and MSOP-8L packages. The extended temperature range of -40 ℃ to +125 ℃ over all supply voltages offers additional design flexibility. Applications ● Portable Equipment ● Mobile Communications ● Smoke Detector ● Sensor Interface ● Medical Instrumentation ● Handheld Test Equipment ● Battery-Powered Instruments Pin Assignments Figure 1. Pin Assignment Diagram (SOP-8L and MSOP-8L Package) E-CMOS Corp. (www.ecmos.com.tw) Page 1 of 12 3L27N-Rev.P001 EC5759 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier Ordering Information EC5759NN XX X M1：SOP-8L R1：MSOP-8L Part Number Package EC5759NNM1R SOP-8L EC5759NNR1R MSOP-8L Marking Marking Information 1. LLLLL：Last five Number of Lot No EC5759 LLLLL YYWWT 2. YY：Year Code 3. WW：Week Code 4. T：Internal Tracking Code Application Information Size EC5759 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. The small footprints of the EC5759 series packages save space on printed circuit boards and enable the design of smaller electronic products. Power Supply Bypassing and Board Layout EC5759 series operates from a single 2.2V to 5.5V supply or dual ±1.1V to ±2.75V supplies. For best performance, a 0.1μF ceramic capacitor should be placed close to the VDD pin in single supply operation. For dual supply operation, both VDD and VSS supplies should be bypassed to ground with separate 0.1μFceramic capacitors. Low Supply Current The low supply current (typical 80μA) of EC5759 series will help to maximize battery life. They are ideal for battery powered Systems Operating Voltage EC5759 series operate under wide input supply voltage (2.2V to 5.5V). In addition, all temperature specifications apply from -40℃ to +125℃. Most behavior remains unchanged throughout the full operating voltage range. These guarantees ensure operation throughout the single Li-Ion battery lifetime. Rail-to-Rail Input The input common-mode range of EC5759 series extends 100mV beyond the supply rails (V SS-0.1V to VDD+0.1V). This is achieved by using complementary input stage. For normal operation, inputs should be limited to this range. E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 12 3L27N-Rev.P001 EC5759 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier Rail-to-Rail Output Rail-to-Rail output swing provides maximum possible dynamic range at the output. This is particularly important when operating in low supply voltages. The output voltage of EC5759 series can typically swing to less than 10mV from supply rail in light resistive loads (>100kΩ), and 60mV of supply rail in moderate resistive loads (10kΩ). Capacitive Load Tolerance The EC5759 series can directly drive 250pF capacitive load in unity-gain without oscillation. Increasing the gain enhances the amplifier’s ability to drive greater capacitive loads. In unity-gain configurations, the capacitive load drive can be improved by inserting an isolation resistor RISO in series with the capacitive load, as shown in Figure 2. Figure 2. Indirectly Driving a Capacitive Load Using Isolation Resistor The bigger the RISO resistor value, the more stable VOUT will be. However, if there is a resistive load R L in parallel with the capacitive load, a voltage divider (proportional to R ISO/RL) is formed, this will result in a gain error. The circuit in Figure 3 is an improvement to the one in Figure 2. R F provides the DC accuracy by feed-forward the VIN to RL. 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 the phase margin in the overall feedback loop. Capacitive drive can be increased by increasing the value of CF. This in turn will slow down the pulse response. Figure 3. Indirectly Driving a Capacitive Load with DC Accuracy Differential amplifier The differential amplifier allows the subtraction of two input voltages or cancellation of a signal common the two inputs. It is useful as a computational amplifier in making a differential to single-end conversion or in rejecting a common mode signal. Figure 4. shown the differential amplifier using EC5759 E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 12 3L27N-Rev.P001 EC5759 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier Figure 4. Differential Amplifier If the resistor ratios are equal (i.e. R1=R3 and R2=R4), then Instrumentation Amplifier The input impedance of the previous differential amplifier is set by the resistors R 1, R2, R3, and R4. To maintain the high input impedance, one can use a voltage follower in front of each input as shown in the following two instrumentation amplifiers. Three-Op-Amp Instrumentation Amplifier The dual EC5759 can be used to build a three-op-amp instrumentation amplifier as shown in Figure 5. Figure 5. Three-Op-Amp Instrumentation Amplifier The amplifier in Figure 5 is a high input impedance differential amplifier with gain of R 2/R1. The two differential voltage followers assure the high input impedance of the amplifier. E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 12 3L27N-Rev.P001 EC5759 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier Two-Op-Amp Instrumentation Amplifier EC5759 can also be used to make a high input impedance two-op-amp instrumentation amplifier as shown in Figure 6. Figure 6. Two-Op-Amp Instrumentation Amplifier Where R1=R3 and R2=R4. If all resistors are equal, then Vo=2(VIP-VIN) Single-Supply Inverting Amplifier The inverting amplifier is shown in Figure 7. The capacitor C1 is used to block the DC signal going into the AC signal source VIN. The value of R1 and C1 set the cut-off frequency to ƒC=1/(2πR1C1). The DC gain is defined by VOUT=-(R2/R1)VIN Figure 7. Single Supply Inverting Amplifier Low Pass Active Filter The low pass active filter is shown in Figure 8. The DC gain is defined by –R2/R1. The filter has a -20dB/decade rolloff after its corner frequency ƒC=1/(2πR3C1). E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 12 3L27N-Rev.P001 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier EC5759 Figure 8. Low Pass Active Filter Sallen-Key 2nd Order Active Low-Pass Filter EC5759 can be used to form a 2nd order Sallen-Key active low-pass filter as shown in Figure 9. The transfer function from VIN to VOUT is given by Where the DC gain is defined by ALP=1+R3/R4, and the corner frequency is given by The pole quality factor is given by Let R1=R2=R and C1=C2=C, the corner frequency and the pole quality factor can be simplified as below And Q=2-R3/R4 Figure 9. Sanllen-Key 2nd Order Active Low-Pass Filter E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 12 3L27N-Rev.P001 EC5759 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier Sallen-Key 2nd Order high-Pass Active Filter The 2nd order Sallen-key high-pass filter can be built by simply interchanging those frequency selective components R1, R2, C1,and C2 as shown in Figure 10. Figure 10. Sanllen-Key 2nd Order Active High-Pass Filter Electrical Characteristics Absolute Maximum Ratings Condition Min Max -0.5V +7V Analog Input Voltage (IN+ or IN-) Vss-0.5V VDD+0.5V PDB Input Voltage Vss-0.5V +7V -40°C +125°C Power Supply Voltage (VDD to Vss) Operating Temperature Range Junction Temperature +150°C Storage Temperature Range -65°C Lead Temperature (soldering, 10sec) +150°C +300°C Package Thermal Resistance (T A=+25°C) SOP-8L, θJA 130°C MSOP-8L, θJA 210°C Note: Stress greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions outside those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. E-CMOS Corp. (www.ecmos.com.tw) Page 7 of 12 3L27N-Rev.P001 EC5759 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier Electrical Characteristics (VDD = +5V, Vss = 0V, VCM = 0V, VOUT = VDD/2, RL=100K tied to VDD/2, SHDNB = VDD, TA = -40°C to +125°C, unless otherwise noted. Typical values are at T A =+25°C.) (Notes 1) Parameter Symbol Supply-Voltage Range Conditions Min. Typ. Max. Units Guaranteed by the PSRR test 2.2 - 5.5 V VDD = 5V 30 40 60 μA Channel A - 0.5 5 Channel B - 5 - - 2 - μV/°C VDD Quiescent Supply Current (per Amplifier) IQ Input Offset Voltage VOS Input Offset Voltage Tempco ΔVOS/ΔT mV Input Bias Current IB (Note 2) - 10 - pA Input Offset Current IOS (Note 2) - 10 - pA -0.1 - VDD+0.1 V VDD=5.5 Vss-0.1VVCMVDD+0.1V 55 65 - dB Vss≤VCM≤5V 60 80 - dB PSRR VDD = +2.5V to +5.5V 75 94 - dB AV VDD=5V, RL=100k, 100 110 - dB 70 80 - dB - 6 - mV - 6 - mV Input Common-Mode Voltage VCM Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Open-Loop Voltage Gain CMRR 0.05V≤VO≤4.95V VDD=5V, RL=5k, 0.05V≤VO≤4.95V Output Voltage Swing VOUT |VIN+-VIN-| 10mV RL = 100k to VDD/2 Output Short-Circuit Current Gain Bandwidth Product Slew Rate Settling Time VDD-VOH VOL-VSS |VIN+-VIN-| 10mV VDD-VOH - 60 - mV RL = 5k to VDD/2 VOL-VSS - 60 - mV Sinking or Sourcing - 20 - mA GBW AV = +1V/V - 1 - MHz SR AV = +1V/V - 0.6 - V/μs - 5 - μs VIN Gain=VS - 2 - μs ƒ = 10kHz - 20 - nV/Hz ISC tS To 0.1%, VOUT = 2V step AV = +1V/V Over Load Recovery Time Input Voltage Noise Density en Note 1: All devices are 100% production tested at T A = +25°C; all specifications over the automotive temperature range is guaranteed by design, not production tested. Note 2: Parameter is guaranteed by design. E-CMOS Corp. (www.ecmos.com.tw) Page 8 of 12 3L27N-Rev.P001 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier EC5759 Typical characteristics At TA=+25°C, RL=100 kΩ connected to VS/2 and VOUT= VS/2, unless otherwise noted. E-CMOS Corp. (www.ecmos.com.tw) Page 9 of 12 3L27N-Rev.P001 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier EC5759 At TA=+25°C, RL=100 kΩ connected to VS/2 and VOUT= VS/2, unless otherwise noted. E-CMOS Corp. (www.ecmos.com.tw) Page 10 of 12 3L27N-Rev.P001 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier EC5759 Package Information SOP-8L E-CMOS Corp. (www.ecmos.com.tw) Page 11 of 12 3L27N-Rev.P001 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier EC5759 MSOP-8L E-CMOS Corp. (www.ecmos.com.tw) Page 12 of 12 3L27N-Rev.P001