MD1622

MD1621/2/4 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MINGDA MICROELECTRONICS FEATURES PRODUCT DESCRIPTION ⚫ ⚫ Low Cost Rail-to-Rail Input and Output 0.8mV Typical VOS ⚫ ⚫ ⚫ ⚫ ⚫ Unity Gain Stable Gain-Bandwidth Product: 3MHz Very Low Input Bias Current: 10pA Supply Voltage Range: 1.8V to 5.5V Input Voltage Range: -0.1V to +5.6V with (VDD - VSS) = 5.5V Low Supply Current: 200μA/Amplifier Small Packaging MD1621 Available in SOT-23-5 MD1622 Available in SOIC-8 MD1624 Available in SOIC-14 The MD1621 (single), MD1622 (dual) and MD1624 (quad) are low cost, rail-to-rail input and output voltage feedback amplifiers. They have a wide input common mode voltage range and output voltage swing, and take the minimum operating supply voltage down to 1.8V. The maximum recommended supply voltage is 5.5V. It is specified over the extended -40 ℃ to +85 ℃ temperature range. ⚫ ⚫ The MD1621/2/4 provide 3MHz bandwidth at a low current consumption of 200μA per amplifier. Very low input bias currents of 10pA enable MD1621/2/4 to be used for integrators, photodiode amplifiers, and piezoelectric sensors. Rail-to-rail input and output are useful to designers for buffering ASIC in single-supply systems. APPLICATIONS ⚫ ASIC Input or Output Amplifier ⚫ Sensor Interface ⚫ Piezoelectric Transducer Amplifier ⚫ Medical Instrumentation ⚫ Mobile Communication ⚫ Audio Output ⚫ Portable Systems ⚫ Smoke Detectors ⚫ Notebook PC ⚫ PCMCIA Cards ⚫ Battery-Powered Equipment ⚫ DSP Interface Applications for this series of amplifiers include safety monitoring, portable equipment, battery and power supply control, and signal conditioning and interfacing for transducers in very low power systems. The MD1621 is available in the Green SOT-23-5 Package. The MD1622 comes in the Green SOIC-8 package. The MD1624 comes in the Green SOIC-14 package. PIN CONFIGURATIONS (TOP VIEW) 1 VSS 2 VIN- 3 VOUTA 1 MD1622 MD1621 VIN+ MD1624 5 VDD 4 VOUT SOT-23-5 14 VOUTD VOUTA 1 8 VDD VINA- 2 13 VIND- VINA- 2 7 VOUTB VINA+ 3 12 VIND+ VINA+ 3 VDD 4 11 VSS VSS 4 6 VINB5 VINB+ VINB+ 5 10 VINC+ VINB- 6 9 VINC- SOIC-8 VOUTB 7 8 VOUTC SOIC-14 MD Micro Corp www.md-ic.com.cn REV. A. 1.1 1 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 ORDER INFORMATION PACKAGE MODEL ORDER NUMBER MARKING PACKAGE OPTION DESCRIPTION INFORMATION MD1621 -- SOT23-5 Tape and Reel, 3000 -- MD1622 -- SOIC-8 Tape and Reel, 4000 -- MD1624 -- SOIC-14 Tape and Reel, 4000 ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD to VSS...............................................................6V Common Mode Input Voltage…...................VSS - 0.3V to VDD + 0.3V Storage Temperature Range.......................................-65℃ to +150℃ Junction Temperature...................................................................150℃ Operating Temperature Range......................................-40℃ to +85℃ Package Thermal Resistance @ TA = +25℃ SOIC-8, θJA....................................................................125 ℃/W Lead Temperature (Soldering 10sec)................................260 ℃ NOTE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ESD, Electrostatic Discharge Protection Symbol 2 Parameter HBM Human Body Model ESD MM Machine Model ESD Condition Minimum Level Unit 4 kV 300 V MD Micro Corp www.md-ic.com.cn 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are At TA=25℃, VDD = +5V, VSS = GND, RL = 100kΩ connected to VDD/2, and VOUT = VDD/2. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT CHARACTERISTICS VCM = VDD/2 Input Offset Voltage VOS VCM = VDD/2 0.8 ● 5 mV 6.6 Input Bias Current IB 10 pA Input Offset Current IOS 10 pA ΔVOS/ΔT 2 μV/℃ -0.1-5.6 V VDD = 5.5V, VCM = -0.1V to 4V 76 dB RL = 100kΩ, VOUT = 2.5V 120 dB RL = 100kΩ, VOUT = +0.2V to +4.8V 119 dB Input Offset Voltage Drift Input Common Mode Voltage Range Common Mode Rejection Ratio VCM CMRR Open-Loop Voltage Gain AOL VDD = 5.5V OUTPUT CHARACTERISTICS VOH RL = 100kΩ 4.980 4.995 V VOL RL = 100kΩ 25 5 mV VOH RL = 10kΩ 4.970 4.994 V VOL RL = 10kΩ 35 6 mV Output Voltage Swing from Rail ISOURCE Output Current 90 RL = 10Ω to VDD/2 mA ISINK 90 POWER SUPPLY 1.8 Operating Voltage Range Power Supply Rejection Ratio ● PSRR V 1.8 VDD = +1.8V to +5.5V, VCM = +0.5V 5.5 85 dB 200 Quiescent Current/Amplifier IQ ● 120 V μA 270 DYNAMIC PERFORMANCE (CL = 100pF) Gain-Bandwidth Product GBP 3 MHz Phase Margin PM RL = 100kΩ, CL = 100pF 45 ° HD2 f = 10kHz, G = +1, RL=100k,VOUT=2VPP 80 HD3 f = 10kHz, G = +1, RL=100k,VOUT=2VPP 80 Harmonic Distortion dBc Slew Rate SR G = +1, 2V Output Step 1.8 V/μs Settling Time to 0.1% ts G = +1, 2V Output Step 6 μs VIN·G = VDD 2 μs f = 1kHz 20 nV/√Hz f = 10kHz 12 nV/√Hz Overload Recovery Time NOISE PERFORMANCE Voltage Noise Density MD Micro Corp www.md-ic.com.cn en 3 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 TYPICAL PERFORMANCE CHARACTERISTICS At TA = +25℃, VDD = +5V, VSS = GND, and RL = 100kΩ connected to VDD/2, unless otherwise specified. 200 0.25 180 160 Supply Current (uA) 0.2 VCM=VDD/2 0.15 0.1 0.05 140 120 100 80 60 40 20 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 5.5 -40 -20 0 Input Voltage (V) Figure 1. Supply Current vs. Supply Voltage 40 60 80 100 120 140 Figure 2. Supply Current vs. Temperature 140 140 Source 120 120 Sink Open-Loop Gain (dB) Output Short Circuit Current (mA) 20 Temperature (℃) 100 80 Sink 60 Source 40 100 80 60 40 20 20 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 -40 5.5 -20 0 20 40 60 80 100 120 Input Voltage (V) Temperature (℃) Figure 3. Output Short Circuit Current vs. Supply Voltage Figure 4. Open-Loop Gain vs. Temperature 140 100 120 90 100 80 70 PSRR (dB) CMRR (dB) 80 60 40 50 40 30 VDD=5.5V 0V≤VCM≤4V 20 20 10 0 0 -40 4 60 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 Temperature (℃) Temperature (℃) Figure 5. CMRR vs. Temperature Figure 6. PSRR vs. Temperature 120 140 MD Micro Corp www.md-ic.com.cn 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 TYPICAL PERFORMANCE CHARACTERISTICS At TA = +25℃, VDD = +5V, VSS = GND, and RL = 100kΩ connected to VDD/2, unless otherwise specified. 90% 80% 80% 70% +OS -OS Small-Signal Overshoot Small-Signal Overshoot 70% 60% 50% 40% 30% 20% -OS 50% 40% 30% 20% G=-1 RFB=10kΩ 10% G=+1 10% +OS 60% 0% 0% 1 10 100 1000 1 10 Load Capacitance(pF) Figure 7. Small-Signal Overshoot vs. Load Capacitance 1000 Figure 8. Small-Signal Overshoot vs. Load Capacitance 5 2.5 VDD=+5V 4.5 Source Sink 2 3.5 Output Voltage (V) 4 Output Voltage (V) 100 Load Capacitance(pF) Source Sink 3 2.5 2 1.5 1 VDD=+1.8V 1.5 1 0.5 0.5 0 0 0 20 40 60 80 0 2 4 Output Current (mA) 6 8 10 Output Current (mA) Figure 9. Output Voltage vs. Output Current Figure 10. Output Voltage vs. Output Current 6 VDD=+5.5V Maximum Output Voltage (VPP) Voltage Noise (nV/√Hz) 10000 1000 100 10 1 0.01 5 VDD=+5V 4 3 2 VDD=+1.8V 1 0 0.1 1 10 100 Frequency (kHz) Figure 11. Input Voltage Noise Spectral Density vs. Frequency MD Micro Corp www.md-ic.com.cn 1 10 100 1000 10000 Frequency (Hz) Figure 12. Maximum Output Voltage vs. Frequency 5 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 TYPICAL PERFORMANCE CHARACTERISTICS At TA = +25℃, VDD = +5V, VSS = GND, and RL = 100kΩ connected to VDD/2, unless otherwise specified G=-5 Offset=2.5V G=-5 Offset=2.5V Offset=2.5V Figure 13. Positive Overload Recovery Time Offset=2.5V Figure 14. Negative Overload Recovery Time Offset=2.5V Figure 15. Phase Reversal Figure 16. Large-Signal Step Response G=+1 G=-1 Offset=2.5V Offset=2.5V RFB=10kΩ Figure 17. Small-Signal Step Response 6 Figure 18. Small-Signal Step Response MD Micro Corp www.md-ic.com.cn 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 TYPICAL PERFORMANCE CHARACTERISTICS At TA = +25℃, VDD = +5V, VSS = GND, and RL = 100kΩ connected to VDD/2, unless otherwise specified. 120 200 100 PSRR 90 100 150 40 50 20 0 0 PSRR and CMRR(dB) 100 60 Open-Loop Phase(°) Open-Loop Gain (dB) CMRR 80 80 70 60 50 40 30 20 -50 -20 10 -40 0.01 -100 0.1 1 10 100 0 0.01 1000 0.1 Frequency (kHz) 1 10 100 1000 Frequency (kHz) Figure 19. Gain and Phase vs. Frequency Figure 20. CMRR and PSRR vs. Frequency 120 1000 100 80 Zol（ohms） Channel Separation（dB） 100 60 40 10 1 0.1 20 0 0.01 0.1 1 10 100 Frequency (kHz) Figure 21. Channel Separation vs. Frequency MD Micro Corp www.md-ic.com.cn 1000 0.01 0.01 0.1 1 10 100 1000 Frequency (kHz) Figure 22. Zol vs. Frequency 7 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 APPLICATION INFORMATION MD1621/2/4 are CMOS, rail-to-rail input and output voltage VDD feedback amplifiers designed for general purpose applications. RISO Operating Voltage VP The MD1621/2/4 are specified over a power-supply range of MD1622 VOUT CL +1.8V to +5.5V (±0.9V to ±2.75V), Supply voltages higher than 6V (absolute maximum) can permanently damage the Figure 23. Driving Large Capacitive Loads amplifier. loop’s phase margin (stability) by making the output load Parameters that vary over supply voltage or temperature are resistive at higher frequencies. shown in the typical characteristics section of this datasheet. PCB Surface Leakage Rail-to-Rail Input In Applications where low input bias current is critical, PC The input stage of the amplifiers is a true rail-to-rail board surface leakage effects need to be considered. Surface architecture, allowing the input common-mode voltage range leakage is caused by humidity, dust or other contamination on of the op amp to extend to both positive and negative supply the board. Under low humidity conditions, a typical resistance rails. This maximizes the usable voltage range of the amplifier, between nearby traces is 1012Ω. A 5V difference would cause an important feature for single-supply and low voltage 5pA of current to flow; which is similar to the MD1621/2/4 op applications. This rail-to-rail input range is achieved with a amps’ bias current at +25℃ (±10pA, typical). complementary input stage—an NMOS input differential pair The best way to reduce surface leakage is to use a guard ring in parallel with a PMOS differential pair. The NMOS pair is around sensitive pins (or traces). The guard ring is biased at active at the upper end of the common-mode voltage range, the same voltage as the sensitive pin. An example of this type typically VDD – 1.2V to 100mV above the positive supply, of layout is shown in Figure 24. while the PMOS pair is active for inputs from 100mV below 1. the negative supply to approximately VDD – 1.2V. Non-inverting Gain and Unity-Gain Buffer: a) Rail-to-Rail Output with a wire that does not touch the PCB surface. A class AB output stage with common-source transistors is b) used to achieve rail-to-rail output. The maximum output proximity of the output voltage to the supply rail. This is a characteristic of all rail-to-rail output amplifiers. See the Connect the guard ring to the inverting input pin (VIN-). This biases the guard ring to the Common voltage swing is proportional to the output current, and larger currents will limit how close the output voltage can get to the Connect the non-inverting pin (VIN+) to the input Mode input voltage. 2. Inverting Gain and Transimpedance Gain Amplifiers (convert current to voltage, such as photo detectors): a) Connect the guard ring to the non-inverting input typical performance characteristic Figure 9, Output Voltage pin (VIN+). This biases the guard ring to the same Swing vs. Output Current. reference voltage as the op amp (e.g., VDD/2 or Capacitive Loads ground). The MD1621/2/4 op amps can directly drive large capacitive b) Connect the inverting pin (VIN-) to the input with a loads. As the load capacitance increases, the feedback loop’s wire that does not touch the PCB surface. phase margin decreases and the closed-loop’s bandwidth is Guard Ring reduced. This produces gain peaking in the frequency VIN- VIN+ VSS response, with overshoot and ringing in the step response. While a op amp in unity gain configuration (G = +1 V/V) is most susceptible to the effects of capacitive loading. When driving large capacitive loads with the MD1621/2/4 amplifiers (e.g., > 100pF when G = +1 V/V), a small series resistor at the output (RISO in Figure 23) improves the feedback 8 Figure 24. Example Guard Ring Layout for Inverting Gain MD Micro Corp www.md-ic.com.cn 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 TYPICAL APPLICATION Differential Amplifier excessive output offset. In addition, a resistor is not needed on The circuit shown in Figure 25 performs the difference function. the noninverting input to cancel bias current offset because If the resistor ratios are equal to (R4 / R3 = R2 / R1), then VOUT = the bias current-related output offset is not significant when (VP - VN) × R2 / R1 + VREF. compared to the voltage offset contribution. For best performance, follow the standard high impedance layout R2 techniques, which include the following: VDD R1 VN VP VOUT MD1622 R3 R4 2.5VREF ⚫ Shielding the circuit. ⚫ Cleaning the circuit board. ⚫ Putting a trace connected to the noninverting input around the inverting input. ⚫ Using separate analog and digital power supplies. C 100pF Figure 25. Differential Amplifier Photodiode Application R 10MΩ The MD1621/2/4 have very high impedance with an input bias current typically around 10 pA. This characteristic allows the VDD OR MD1621/2/4 op amp to be used in photodiode applications and VOUT MD1622 other applications that require high input impedance. Note that the MD1621/2/4 have significant voltage offset that can be removed by capacitive coupling or software calibration. Figure 26 illustrates a photodiode or current measurement application. The feedback resistor is limited to 10 MΩ to avoid MD Micro Corp www.md-ic.com.cn 2.5VREF 2.5VREF Figure 26. High Input Impedance Application—Photodiode Amplifier 9 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 RECOMMENDED MOUNTING METHOD Soldering Methods, Recommended Soldering Method for Moisture-Proof Packing and Flux Cleaning are in the following Mounting was evaluated with the following profiles in our company, so there was no problem. However, confirm mounting by the condition of your company beforehand. 1．Soldering Temperature Profile of Reflow Recommended reflow soldering temperature profile is in the following 2．Soldering Temperature Profile of Flow Recommended flow soldering temperature profile is in the following. 3．Soldering Temperature Profile of Iron Recommended iron soldering temperature profile is in the following. At 1 lead Temperature: Lower than 350°C Time: within 3s 4．Note It is not good for IC's reliability to keep IC high temperature for long time within limit of recommended ranges. Please finish soldering as soon as possible within limit of recommended ranges. See the next section, “IC storage Conditions and Duration” for Moisture-Proof Packing and Deaeration Packing. 10 MD Micro Corp www.md-ic.com.cn 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 PACKAGE OUTLINE DIMENSIONS COMPLIANT TO JEDEC STANDARD MS-012-AA Figure 27 8-Lead Small Outline Package [SOIC] Dimensions shown in millimeters MD Micro Corp www.md-ic.com.cn 11 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 PACKAGE OUTLINE DIMENSIONS COMPLIANT TO JEDEC STANDARD MO-178-AA Figure 28 5-Lead Small Outline Transistor Package [SOT-23] Dimensions shown in millimeters 12 MD Micro Corp www.md-ic.com.cn 3MHz, 200μA, Rail-to-Rail I/O CMOS Operational Amplifiers MD1621/2/4 PACKAGE OUTLINE DIMENSIONS COMPLIANT TO JEDEC STANDARD MS-012-AB Figure 29 14-Lead Small Outline Package [SOIC] Dimensions shown in millimeters MD Micro Corp www.md-ic.com.cn 13