[AK2921] AK2921 Zero Drift operational amplifiers Feature AK2921 is the dual channel CMOS operational amplifires which is available to output with very low input offset voltage (+/- 1.0μV) and near zero input offset dirft. It’s operated with very small current consumptions, 260μA typ./ch (VDD:5.0V), which is available to operate full swing signals in output. AK2921 is appropriated to Sensor Pre Amp. applications. Low Voltage, Single Supply Operation : 1.6V - 5.5V Very Low Input Offset Voltage : +/- 1.0μV typ. Near Zero Dirft over time and temperature : +/- 5.0nV/°C typ. Full Swing Outputs to 10kΩ Load Power Supply Current : 260μA typ./ch (VDD: 5.0V, No Load) Gain Bandwidth : 0.8MHz typ. Package : TMSOP8 Part Name AK2921T Channel Number 2 Package TMSOP8 Pin Location 1:OUTA 2:NINA 8:VDD A 7:OUTB B 3:PINA 6:NINB 5:PINB 4:VSS TMSOP8 (AK2921T) Rev.1.00Ea 2012/4 -1- [AK2921] Pin Function Descriptions Pin number 1 2 3 4 5 6 7 8 Name OUTA NINA PINA VSS PINB NINB OUTB VDD I/O note) AO AI AI PWR AI AI AO PWR Function Amplifier A Output Amplifier A Inverted Input Amplifier A No Inverted Input Power Supply Ground Amplifier B No Inverted Input Amplifier B Inverted Input Amplifier B Output Positive Power Supply Note) PWR AI AO : Power Supply : Analog Input : Analog Output Absolute Maximum Ratings Parameter Supply Voltage Input Voltage Input Current Storage Temperature Range Symbol VDD VTD IIN Tstg Min -0.3 -0.3 -10 -55 Max 6.5 VDD + 0.3 +10 150 VSS=0V ; Note Units V V mA °C Note : All voltage with respect to ground WARNING : Operational at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. Recommended Operating Conditions Parameter Operationg Temperature Range Supply Voltage Minimum Gain Power Supply Current Symbol Ta VDD Av Idd1 Min. -40 2.7 1 Typ. Max. 85 5.5 0.26 0.6 Units °C V V/V mA./ch Conditions VDD=5.0V,No Load Note : When the gain is adjusted to one or less , there is a possibility that operation becomes unstable. *We asuumes no responsibility for the usage beyond the conditions in this datasheet. Rev.1.00Ea 2012/4 -2- [AK2921] Electrical Characteristics DC Characteristics Parameter Input Voltage Offset Input Voltage Offset Drift Input Bias Current Input Common Mode Range Min. Output Voltage Swing Common Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain Short Circuit Current Output Current 100 100 110 VDD:5V, Ta:-40 to 85°C, unless otherwise noted Typ. Max. Units Conditions +/- 1 +/- 20 μV +/- 5 +/- 100 nV/°C +/- 20 pA 0.0 – V VDD-0.2 0.03 – V RL ≥10kΩ connected to VDD/2 VDD-0.03 130 dB 120 dB 130 dB RL ≥10kΩ connected to VDD/2 +/- 85 mA +/- 35 mA AC Characteristics Parameter Gain Bandwidth Slew Rate Input Voltage Noise 0.1 – 10Hz 0.1 – 1Hz Overload Recovery Time Input Capacitance Differential Common Mode Maximum Capacitance Loads Min. Typ. 0.8 1 100 2.1 0.7 0.04 1.5 6 Rev.1.00Ea VDD:5V, Ta:-40 to 85°C, unless otherwise noted Max. Units Conditions MHz Av:1V/V V/μs Av:1V/V nVrms f:1kHz /√Hz μVpp μVpp msec Av:50V/V pF PF 150 pF 2012/4 -3- [AK2921] Typical Operating Characteristics Supply Current vs. Temperature (Vin:1/2VDD) IDD - Temperature 1000 IDD [μA] 800 600 400 1.6V 200 5V 0 -40 -20 0 20 40 60 80 Temperature [℃] Supply Current vs. Supply Voltage (Vin:1/2VDD) IDD - VDD (Ta = 25℃) 1000 IDD [μA] 800 600 400 200 0 0 1 2 3 4 5 6 Supply Voltage [V] Rev.1.00Ea 2012/4 -4- [AK2921] Output voltage vs. Load current (VDD=1.6V, Ta=25°C) Output voltage vs. Load current (VDD=5V, Ta=25°C) Isource/Isink - VOH/VOL Isource / Isink - VOH / VOL 5 1.6 1.4 4 VOH / VOL [V] VOH / VOL [V] 1.2 1 0.8 0.6 0.4 source 2 source 1 sink 0.2 3 sink 0 0 0 2 4 6 8 0 10 20 40 Closed loop gain vs. Frequency (VDD=1.6V, Ta=25°C) 70 60 60 C lo sed lo o p g ain [d B ] C lo sed lo o p g ain [d B ] 50 Av = 100, RL=2kΩ 40 Av = 10, RL=2kΩ 20 10 Av = 1, RL=2kΩ 0 30 10 -20 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 Frequency [Hz] Av = 1, RL=2kΩ 0 -20 1.E+02 Av = 10, RL=2kΩ 20 -10 1.E+01 Av = 100, RL=2kΩ 40 -10 -30 1.E+00 100 Closed loop gain 70 30 80 Closed loop gain vs. Frequency (VDD=5V, Ta=25°C) Closed loop gain 50 60 Isource / Isink [mA] Isource / Isink [mA] -30 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 Frequency [Hz] Rev.1.00Ea 2012/4 -5- [AK2921] Open loop gain and Phase vs. Frequency (VDD=1.6V, Ta=25°C) Open loop gain and Phase vs. Frequency (VDD=5V, Ta=25°C) Open loop gain and Phase vs. Frequency Open loop gain and Phase vs. Frequency 180 Gain 40 90 40 90 30 45 30 45 20 0 20 0 10 -45 10 -45 0 -90 0 -90 -135 -10 -20 1.E+03 Op en lo o p g ain [d B ] 50 Ph a se [d e g ree s] 135 Phase 1.E+04 1.E+05 -10 -180 1.E+07 1.E+06 Phase -20 1.E+03 -135 1.E+04 Frequency [Hz] -180 1.E+07 1.E+06 Output impedance vs. Frequency (VDD=5V, Ta=25°C) Output impedance vs. Frequency Output impedance vs. Frequency 500 350 AV=1 AV=1 300 AV=10 AV=10 AV=100 AV=100 Ou tp u t im p ed an ce [Ω ] Output impedance[Ω] Output Ou tpimpedance[Ω] u t im p ed a n ce [Ω ] 1.E+05 Frequency [Hz] Output impedance vs. Frequency (VDD=1.6V, Ta=25°C) 400 135 Ph ase [d eg rees] Gain 50 O p e n lo o p g a in [d B ] 60 180 60 300 200 100 250 200 150 100 50 0 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 Frequency [Hz] 0 1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06 1.0E+07 Frequency [Hz] Rev.1.00Ea 2012/4 -6- [AK2921] Large signal transient response (VDD/VSS = +0.8V/- 0.8V, Ta = 25°C, CL = 150pF) Large signal transient response (VDD/VSS = +2.5V/-2.5V Ta = 25°C, CL = 150pF) Large sigmnal transient response 1 4 0. 75 3 Output voltage (1V/div) Output voltage (0.25V/div) La rge sigmnal transient response 0 .5 0. 25 0 -0. 25 -0 .5 2 1 0 -1 -2 -0. 75 -3 -1 -4 TIME (4μs/DIV) TIME (4μs/DIV) Small signal transient response (VDD/VSS = +0.8V/- 0.8V, Ta = 25°C, CL = 150pF) Small signal transient response (VDD/VSS = +2.5V/-2.5V Ta = 25°C, CL = 150pF) Small sigmna l tra nsient response 0 .2 0 .2 0. 15 0. 15 Output voltage (50mV/div) Output voltage (50mV/div) Small sigmnal transient response 0 .1 0. 05 0 -0. 05 -0 .1 -0. 15 0 .1 0. 05 0 -0. 05 -0 .1 -0. 15 -0 .2 -0 .2 TIME (4μs/DIV) TIME (4μs/DIV) Rev.1.00Ea 2012/4 -7- [AK2921] Small signal overshoot vs. Load Capacitance (VDD=1.6V, Ta=25°C) Small signal overshoot vs. Load Capacitance (VDD=5V, Ta=25°C) Small signal overshoot vs. Loadcapacitance Small signal overshoot vs. Loadcapacitance 50 50 45 OS＋ 40 OS－ OS＋ 40 OS－ 35 Overshoot [% ] Overshoot [% ] 35 45 30 25 20 30 25 20 15 15 10 10 5 5 0 0 1 10 100 1000 1 10 Load capacitance [pF] 100 1000 Load capacitance [pF] Positive overvoltage recovery (VDD/VSS = +2.5V/-2.5V, Ta = 25°C) Negative overvoltage recovery (VDD/VSS = +2.5V/-2.5V, Ta = 25°C) Negative overvoltage recovery Positive overvoltage recovery Av = -50V RL=10kΩ Input = 50mV/DIV Voltage [V] Voltage [V] Input = 50mV/DIV Output = 1V/DIV Av = -50V RL=10kΩ Output = 1V/DIV Time (10μsec/DIV) Time (10μsec/DIV) Rev.1.00Ea 2012/4 -8- [AK2921] Common Mode Rejection Ratio vs. Frequency CMRR 160 140 1.6V 5.0V C M R R [dB ] 120 100 80 60 40 20 0 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 Frequency [Hz] Power Supply Rejection Ratio vs. Frequency (VDD=1.6V, Ta=25°C) Power Supply Rejection Ratio vs. Frequency (VDD=5V, Ta=25°C) PSRR PSRR 140 140 5.0V_VDD 1.6V_VDD 120 120 5.0V_VSS 1.6V_VSS 100 PSRR (dB ) PSR R [d B ] 100 80 60 80 60 40 40 20 20 0 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 0 1.E+00 1.E+06 Frequency [Hz] 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 Frequency (Hz) Rev.1.00Ea 2012/4 -9- [AK2921] Power Supply Rejection Ratio vs. Temperature PSRR - Temperature 1 30 1 20 PSRR [dB] 1 10 1 00 90 80 70 60 50 -40 -20 0 20 40 60 80 Temperature [℃] Maximum output swing vs. Frequency (VDD=1.6V, Ta=25°C, Av = 1, RL = 10kΩ) Maximum output swing vs. Frequency (VDD=5V, Ta=25°C, Av = 1, RL = 10kΩ) Maximum output swing Maximum output swing 6 1 .6 Maximum output swing [V] Maximum output swing [V] 2 1 .2 0 .8 0 .4 0 1.E +0 1 5 4 3 2 1 0 1 .E+02 1.E +0 3 1 .E+04 1.E +0 5 1 .E+06 1.E +0 7 Frequency [Hz] 1 .E+01 1.E+02 1.E +03 1. E+04 1.E+05 1.E+06 1.E +0 7 Frequency [Hz] Rev.1.00Ea 2012/4 - 10 - [AK2921] Voltage noise density (VDD=1.6V, Ta=25°C, f=0~2.5kHz) Voltage noise density (VDD=5V, Ta=25°C, f=0~2.5kHz) Voltage noise density 2 00 2 00 1 80 1 80 Voltage noise density[nV/√Hz] Voltage noise density[nV/√Hz] Voltage noise density 1 60 1 40 1 20 1 00 80 60 40 20 1 60 1 40 1 20 1 00 80 60 40 20 0 0 0 500 1 000 15 00 20 00 250 0 0 500 Frequency [Hz] 15 00 20 00 250 0 400 00 500 00 Frequency [Hz] Voltage noise density (VDD=1.6V, Ta=25°C, f=0~20kHz) Voltage noise density (VDD=5V, Ta=25°C, f=0~50kHz) Voltage noise density (f=0～50kHz) Volta ge noise density (f=0～50kHz) 2 00 2 00 1 80 1 80 Voltage noise density [nV/√ Hz] Voltage noise density [nV/√Hz] 1 000 1 60 1 40 1 20 1 00 80 60 40 20 1 60 1 40 1 20 1 00 80 60 40 20 0 0 0 100 00 200 00 300 00 400 00 5000 0 0 10 000 200 00 300 00 Frequency [Hz] Frequency [Hz] Rev.1.00Ea 2012/4 - 11 - [AK2921] Voltage noise density (VDD=5V, Ta=25°C, f=1~10kHz) Voltage noise density (f=1～10kHz) Voltage noise density [nV/√Hz] 1 000 100 10 1. E+00 1 .E+01 1.E+02 1.E+03 1.E +0 4 Frequency [Hz] Voltage noise (VDD=1.6V, Ta=25°C, f=0.1~10Hz) Voltage noise (VDD=5V, Ta=25°C, f=0.1~10Hz) 0.1Hz to 10Hz Noise 0.1Hz to 10Hz Noise 3 3 Vn=2.3µVpp 2 1 1 Voltage [μV] Voltage [μV] Vn=1.8µVpp 2 0 -1 0 -1 -2 -2 -3 -3 TIME (sec) TIME (sec) Rev.1.00Ea 2012/4 - 12 - [AK2921] Output short-circuit current vs. Temperature (VDD=1.6V, Ta=-40 to 85°C) Maximum output swing vs. Frequency (VDD=5V, Ta=25°C, Ta=-40 to 85°C) Output short-circuit current Output short-circuit current 100 30 Isc- 20 Isc+ 80 Ou tp u t sh o rt-circu it cu rren t [mA] Ou tp u t sh o rt-circu it cu rren t [mA] Isc+ 10 0 -10 -20 Isc- 60 40 20 0 -20 -40 -60 -80 -100 -30 -40 -20 0 20 40 60 -40 80 -20 0 20 40 60 80 Temperature [℃] Temperature [℃] Input offset voltage drift(VDD=5V, Ta=25°C, Ta=-40 to 85°C) Input offset voltage drift 50 45 Number of amplifiers 40 35 30 25 20 15 10 5 0 -20 -15 -10 -5 0 5 10 15 20 Input offset Voltage drift [nV/℃] Rev.1.00Ea 2012/4 - 13 - [AK2921] Package 1. Marking 1.1 TMSOP8 8 7 6 5 (1) Pin Number 1 indication mark (2) Part Number (3) Date Code (Year) (4) Date Code (Month) (5) Lot Number 920 (2) YMA (1) (3) (4) (5) 1 2 3 4 2. Outline Dimensions 2.1 TMSOP8 Package Outline (UNIT:mm) 0.127 +0.1 -0.05 0.55±0.2 2.8 4.0±0.2 2.9 +0.12 -0.1 0.95MAX 1 0.65 +0.1 0.1 -0.05 0~10° 0.1 0.2±0.05 0.1 M Rev.1.00Ea 2012/4 - 14 - [AK2921] IMPORTANT NOTICE z These products and their specifications are subject to change without notice. When you consider any use or application of these products, please make inquiries the sales office of Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the products. z Descriptions of external circuits, application circuits, software and other related information contained in this document are provided only to illustrate the operation and application examples of the semiconductor products. You are fully responsible for the incorporation of these external circuits, application circuits, software and other related information in the design of your equipments. AKM assumes no responsibility for any losses incurred by you or third parties arising from the use of these information herein. AKM assumes no liability for infringement of any patent, intellectual property, or other rights in the application or use of such information contained herein. z Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. z AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety, life support, or other hazard related device or systemNote2), and AKM assumes no responsibility for such use, except for the use approved with the express written consent by Representative Director of AKM. As used here: Note1) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. Note2) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. z It is the responsibility of the buyer or distributor of AKM products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification. Rev.1.00Ea 2012/4 - 15 -