EC5755 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier Amplifier General Description Features The EC5755 is a single supply, low power CMOS ● Single-Supply Operation from +2.2V ~ +5.5V operational amplifier; these amplifiers offer bandwidth of ● Rail-to-Rail Input / Output 250kHz, rail-to-rail inputs and outputs, and single-supply ● Gain-Bandwidth Product: 250kHz (Typ.) operation from 2.2V to 5.5V. Typical low quiescent supply ● Low Input Bias Current: 10pA (Typ.) current of 7μA in single operational amplifiers within one ● Low Offset Voltage: 5.5mV (Max.) chip and very low input bias current of 10pA make the ● Quiescent Current: 7μA per Amplifier (Typ.) devices an ideal choice for low offset, low power ● Operating Temperature: -40°C ~ +125°C consumption and high impedance applications. The ● Available in SOT23-5 and SOP8 Packages EC5755 is available in SOT23-5 and SOP8 packages.. The extended temperature range of -40 ℃ to +125℃ over all supply voltages offers additional design flexibility. Applications ● Portable Equipment ● Handheld Test Equipment ● Mobile Communications ● Medical Instrumentation ● Smoke Detector ● Battery-Powered Instruments ● Sensor Interface Pin Assignments Figure 1. Pin Assignment Diagram (SOT23-5 and SOP8 Package) E-CMOS Corp. (www.ecmos.com.tw) Page 1 of 13 3L02N-Rev.P001 EC5755 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier Amplifier Ordering Information EC5755NN XX X B2：SOT23-5L M1：SOP-8L Part Number Package Marking Marking Information 1. Y：Year code(D=2013;E=2014;F=2015…) EC5755NNB2R SOT23-5L 755YW 2. W：Week Code( The big character of A~Z is for the week of 1~26, and small a~z is for the week of 27~52. 1. LLLLL：Last five Number of Lot No EC5755NNM1R SOP-8L EC5755 LLLLL YYWWT 2. YY：Year Code 3. WW：Week Code 4. T：Internal Tracking Code Application Information Size EC5755 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. The small footprints of the EC5755 series packages save space on printed circuit boards and enable the design of smaller electronic products. Power Supply Bypassing and Board Layout EC5755 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 7μA) of EC5755 series will help to maximize battery life. They are ideal for battery powered Systems Operating Voltage EC5755 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. E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 13 3L02N-Rev.P001 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier EC5755 Amplifier Rail-to-Rail Input The input common-mode range of EC5755 series extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). This is achieved by using complementary input stage. For normal operation, inputs should be limited to this range. 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 EC5755 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 EC5755 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 RL 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. RF 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 E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 13 3L02N-Rev.P001 EC5755 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier Amplifier 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 EC5755. 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 triple EC5755 can be used to build a three-op-amp instrumentation amplifier as shown in Figure 5. Figure 5. Three-Op-Amp Instrumentation Amplifier E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 13 3L02N-Rev.P001 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier EC5755 Amplifier The amplifier in Figure 5 is a high input impedance differential amplifier with gain of R2/R1. The two differential voltage followers assure the high input impedance of the amplifier. Two-Op-Amp Instrumentation Amplifier EC5755 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 6. 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 E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 13 3L02N-Rev.P001 EC5755 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier 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 roll-off after its corner frequency ƒC=1/(2πR3C1). Figure 8. Low Pass Active Filter Sallen-Key 2nd Order Active Low-Pass Filter EC5755 can be used to form a 2 nd 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 E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 13 3L02N-Rev.P001 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier EC5755 Amplifier Figure 9. Sanllen-Key 2nd Order Active Low-Pass Filter Sallen-Key 2nd Order high-Pass Active Filter The 2 nd 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 E-CMOS Corp. (www.ecmos.com.tw) Page 7 of 13 3L02N-Rev.P001 EC5755 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier Amplifier 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 (TA=+25℃) SOP8, θJA 130°C MSOP8, 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 8 of 13 3L02N-Rev.P001 EC5755 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier 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 Min. Typ. Max. Units 2.2 - 5.5 V - 7 10 μA VOS - 1 5.5 ΔVOS/ΔT - 3 - μV/°C Supply-Voltage Range Quiescent Supply Current (per Conditions Guaranteed by the PSRR test VDD VDD = 5V Amplifier) Input Offset Voltage Input Offset Voltage Tempco mV Input Bias Current IB (Note 2) - 10 - pA Input Offset Current IOS (Note 2) - 10 - pA -0.1 - VDD+0.1 V 55 65 - dB Vss≤VCM≤5V 60 70 - dB VDD = +2.2V to +5.5V 60 70 - dB 85 92 - dB 75 82 - dB Input Common-Mode Voltage VCM Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Open-Loop Voltage Gain CMRR PSRR AV VDD=5.5 Vss-0.1V VDD=5V, RL=100k VCM VDD+0.1V , 0.05V≤VO≤4.95V VDD=5V, RL=5k , 0.05V≤VO≤4.95V Output Voltage Swing VOUT |VIN+-VIN-| 10mV VDD-VOH - 10 - mV RL = 100k to VDD/2 VOL-VSS - 10 - mV |VIN+-VIN-| 10mV VDD-VOH - 100 - mV - 100 - mV -15 - +20 mA RL = 5k Output Short-Circuit Current Gain Bandwidth Product Slew Rate Settling Time ISC to VDD/2 VOL-VSS Sinking or Sourcing GBW AV = +1V/V - 250 - kHz SR AV = +1V/V - 0.15 - V/μs - 15 - μs - 6 - μs - 110 - tS To 0.1%, VOUT = 2V step AV = +1V/V Over Load Recovery Time Input Voltage Noise Density VIN en Gain=VS ƒ = 1kHz nV/ 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 9 of 13 3L02N-Rev.P001 Hz 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier EC5755 Amplifier 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 10 of 13 3L02N-Rev.P001 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier EC5755 Amplifier 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 11 of 13 3L02N-Rev.P001 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier EC5755 Amplifier Package Information SOT23-5 E-CMOS Corp. (www.ecmos.com.tw) Page 12 of 13 3L02N-Rev.P001 250kHz, 7μA, CMOS, Rail-to-Rail Operational Amplifier EC5755 Amplifier SOP8 E-CMOS Corp. (www.ecmos.com.tw) Page 13 of 13 3L02N-Rev.P001