ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
- 1 -
AK2920
Zero Drift operational amplifiers
Feature
AK2920 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, 800μA typ./ch (VDD:5.0V), which is available to operate full
swing signals in output.
AK2920 is appropriated to Sensor Pre Amp. applications.
Low Voltage, Single Supply Operation : 2.7V - 5.5V
Very Low Input Offset Voltage : +/- 1.0μV typ.
Near Zero Dirft over time and temperature : +/- 2.0nV/°C typ.
Full Swing Outputs to 10kΩ Load
Power Supply Current : 800μA typ./ch (VDD: 5.0V, No Load)
Gain Bandwidth : 2MHz typ.
Package : TMSOP8
Part Name Channel Number Package
AK2920T 2 TMSOP8
Pin Location
TMSOP8
(AK2920T)
2:NINA
4:VSS
1:OUTA 8:VDD
5:PINB
3:PINA
7:OUTB
6:NINB
A
B
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Pin Function Descriptions
Pin number Name I/O note) Function
1 OUTA AO Amplifier A Output
2 NINA AI Amplifier A Inverted Input
3 PINA AI Amplifier A No Inverted Input
4 VSS PWR Power Supply Ground
5 PINB AI Amplifier B No Inverted Input
6 NINB AI Amplifier B Inverted Input
7 OUTB AO Amplifier B Output
8 VDD PWR Positive Power Supply
Note)
PWR : Power Supply
AI : Analog Input
AO : Analog Output
Absolute Maximum Ratings
VSS=0V ; Note
Parameter Symbol Min Max Units
Supply Voltage VDD -0.3 6.5 V
Input Voltage VTD -0.3 VDD + 0.3 V
Input Current IIN -10 +10 mA
Storage Temperature Range Tstg -55 150 °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 Symbol Min. Typ. Max. Units Conditions
Operationg Temperature Range Ta -40 85 °C
Supply Voltage VDD 2.7 5.5 V
Power Supply Current Idd1 0.8 1.5 mA/ch VDD=5.0V,No Load
*We asuumes no responsibility for the usage beyond the conditions in this datasheet.
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Electrical Characteristics
DC Characteristics
VDD:5V, Ta:-40 to 85°C, unless otherwise noted
Parameter Min. Typ. Max. Units Conditions
Input Voltage Offset +/- 1 +/- 10
μ
V
Input Voltage Offset Drift +/- 2 +/- 20 nV/°C
Input Bias Current +/- 100 pA
Input Common Mode Range 0.0 –
VDD-0.2 V
Output Voltage Swing 0.03 –
VDD-0.03 V
RL ≥10kΩ connected to VDD/2
Common Mode Rejection Ratio 110 130 dB
Power Supply Rejection Ratio 110 130 dB
Large Signal Voltage Gain 110 130 dB RL ≥10kΩ connected to VDD/2
Short Circuit Current +/- 50 mA
Output Current +/- 25 mA
AC Characteristics
VDD:5V, Ta:-40 to 85°C, unless otherwise noted
Parameter Min. Typ. Max. Units Conditions
Gain Bandwidth 2 MHz Av:1V/V
Slew Rate 1 V/
μ
sAv:1V/V
Input Voltage Noise 25 nVrms
/√Hz f:1kHz
0.1 – 10Hz 0.2
μ
Vpp
0.1 – 1Hz 0.1
μ
Vpp
Overload Recovery Time 0.02 msec Av:1V/V
Input Capacitance Differential 1.5 pF
Common Mode 12 PF
Maximum Capacitance Loads 150 pF
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Typical Operating Characteristics
Supply Current vs. Temperature
(Vin:1/2VDD)
Supply Current vs. Supply Voltage
(Vin:1/2VDD)
IDD-Temperature
0
500
1000
1500
2000
2500
-40-200 20406080
Tem p er ature [ °C]
IDD [ A]
2.7V
5.0V
IDD-VDD
(Ta = 25°C)
0
500
1000
1500
2000
2500
0123456
Supply voltage [V]
IDD [ A]
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
- 5 -
Output voltage vs. Load current Output voltage vs. Load current
(VDD=2.7V, Ta=25°C) (VDD=5V, Ta=25°C)
Closed loop gain vs. Frequency Closed loop gain vs. Frequency
(VDD=2.7V, Ta=25°C) (VDD=5V, Ta=25°C)
Isource / Isink - VOL / V OH
0.01
0.1
1
10
100
1000
10000
0.0001 0.001 0.01 0.1 1 10
Isource / Isin k [mA]
VOL / VOH [mV]
source
sink
Isouce / Isink - VOL / VOH
0.01
0.1
1
10
100
1000
10000
0.0001 0.001 0.01 0.1 1 10
Isource / Isin k [mA]
VOL / VOH [mV]
source
sink
Closed loop gain
-30
-20
-10
0
10
20
30
40
50
60
70
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]
Closed loop gain [dB]
Av = 100, RL = 2k⎠
Av = 10, RL = 2k⎠
Av = 1 , RL = 2k⎠
Clos ed loop gain
-30
-20
-10
0
10
20
30
40
50
60
70
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]
Closed loop gain [dB]
Av = 100, RL = 2k
Av = 10, RL = 2k
Av = 1, RL = 2k
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Open loop gain and Phase vs. Frequency Open loop gain and Phase vs. Frequency
(VDD=2.7V, Ta=25°C) (VDD=5V, Ta=25°C)
Output impedance vs. Frequency Output impedance vs. Frequency
(VDD=2.7V, Ta=25°C) (VDD=5V, Ta=25°C)
Open loop gain and Phase vs. Frequency
-20
-10
0
10
20
30
40
50
60
70
1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Frequency [Hz]
Open loop gain [dB]
-180
-140
-100
-60
-20
20
60
100
140
180
Phase [degrees]
Gain
Phase
Open loop gain and Phase vs. Frequency
-20
-10
0
10
20
30
40
50
60
70
1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Frequency [Hz]
Open loop gain [dB]
-180
-140
-100
-60
-20
20
60
100
140
180
Phase [degrees]
Gain
Phase
Output impedance vs. Frequency
0
50
100
150
200
250
300
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Frequency [Hz]
Output impedance[Ω]
Av=1
Av=10
Av=100
Output impedance vs. Frequency
0
50
100
150
200
250
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Frequency [Hz]
Output impedance [Ω]
Av=1
Av=10
Av=100
Output impedance[Ω]
Output impedance[Ω]
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Large signal transient response Large signal transient response
(VDD/VSS = +1.35V/- 1.35V, (VDD/VSS = +2.5V/-2.5V
Ta = 25°C, CL = 150pF) Ta = 25°C, CL = 150pF)
Small signal transient response Small signal transient response
(VDD/VSS = +1.35V/- 1.35V, (VDD/VSS = +2.5V/-2.5V
Ta = 25°C, CL = 150pF) Ta = 25°C, CL = 150pF)
Large signal transient response
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
Time (4μsec/DIV)
Output voltage (0.5V/DIV)
Large signal tansient respons
-4
-3
-2
-1
0
1
2
3
4
Time (4μs/DIV)
Output voltage (1V/DIV)
Small signal transient response
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
Ti me (4μs/DIV)
Output voltage (50mV/DIV)
Small signal transinet response
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
Ti me (4μs/DIV)
Output voltage (50mV/DIV)
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Small signal overshoot vs. Load Capacitance Small signal o vershoot vs. Load Capac itance
(VDD=2.7V, Ta=25°C) (VDD=5V, Ta=25°C)
Positive overvoltage recovery Negative overvoltage recovery
(VDD/VSS = +2.5V/-2.5V, Ta = 25°C) (VDD/VSS = +2.5V/-2.5V, Ta = 25°C)
Small signal overshoot vs. Load capacitance
0
10
20
30
40
50
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04
Load capacitance [pF]
Overshoot [%]
OS+
OS-
Small signal overshoot vs. Load capacitance
0
10
20
30
40
50
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04
Load capacitance [pF]
Overshoot [%]
OS+
OS-
Positive overvoltage re covery
Voltage [V]
Av = -50
RL = 10k
CH1 = 1V/DIV
CH2 = 50mV/DIV
Time
(
10
μ
sec/DIV
)
Negative overvoltage recovery
Time (10μsec/DIV)
Av = -50
RL = 10k
CH1 = 1V/DIV
CH2 = 50mV/DIV
Voltage [ V]
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Common Mode Rejection Ratio vs. Frequency
Power Supply Rejection Ratio vs. Frequency Power Supply Reject ion Ratio vs. Frequen cy
(VDD=2.7V, Ta=25°C) (VDD=5V, Ta=25°C)
CMRR
0
20
40
60
80
100
120
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05
Frequency [Hz]
CMRR [dB]
2.7V
5.0V
PSRR
0
20
40
60
80
100
120
140
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
Frequency [Hz]
PSRR [dB]
2.7V_VDD
2.7V_VSS
PSRR
0
20
40
60
80
100
120
140
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
Frequency [Hz]
PSRR [dB]
5.0V_VDD
5.0V_VSS
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
- 10 -
Power Supply Rejection Ratio vs. Temperature
(VDD=5V
Maximum output swing vs. Frequency Maximum output swing vs. Frequency
(VDD=2.7V, Ta=25°C, Av = 1, RL = 10kΩ) (VDD=5V, Ta=25°C, Av = 1, RL = 10kΩ)
PSRR - Temperature
50
60
70
80
90
100
110
120
130
-40 10 60
Temperature [°C]
PSRR [dB]
Maximum output swing
0
0.5
1
1.5
2
2.5
3
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Frequency [Hz]
Maximum output swing [V]
Maximum output swing
0
1
2
3
4
5
6
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Frequency [Hz]
Maximum output swing [V]
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Voltage noise density Voltage noise density
(VDD=2.7V, Ta=25°C, f=0~2.5kHz) (VDD=5V, Ta=25°C, f=0~2.5kHz)
Voltage noise density Voltage noise density
(VDD=2.7V, Ta=25°C, f=0~20kHz) (VDD=5V, Ta=25°C, f=0~20kHz)
Volt age noise density
0
20
40
60
80
100
120
0 5000 10000 15000 20000
Frequency [Hz]
Voltage noise density [nV/√Hz]
Vol t age noise density
0
20
40
60
80
100
120
0 5000 10000 15000 20000
Frequency [Hz]
Voltage noise density [nV/√Hz]
Voltage noise density
0
20
40
60
80
100
120
0 500 1000 1500 2000 2500
Frequency [Hz]
Voltage noise density [nV/
√Hz]
Voltage noise density
0
20
40
60
80
100
120
0 500 1000150020002500
Frequency [Hz]
Voltag e noise d ensity [ nV/ √Hz]
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
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Voltage noise density
(VDD=5V, Ta=25°C, f=1~10kHz)
Voltage noise Voltage noise
(VDD=2.7V, Ta=25°C, f=0.1~10Hz) (VDD=5V, Ta=25°C, f=0.1~10Hz)
Voltage noise density
10
100
1 10 100 1000 10000
Frequency [Hz]
Voltage noise density [nV/√Hz]
0.1Hz to 10H z Noise
Voltage [μV]
Time (1sec/DIV)
Vn = 0.31μVpp
Vn
+0.3
+0.2
-0.2
-0.3
0.1Hz to 10H z Noise
Voltage [μV]
Time (1sec/DIV)
Vn = 0.18
μ
Vpp
Vn
+0.3
+0.2
-0.2
-0.3
-0.1
+0.1
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
- 13 -
Output short-circuit current vs. Temperature Maximum output swing vs. Frequency
(VDD=2.7V, Ta=-40 to 85°C) (VDD=5V, Ta=25°C, Ta=-40 to 85°C)
Input offset voltage drift(VDD=5V, Ta=25°C, Ta=-40 to 85°C)
Input offset voltage drifft
0
5
10
15
20
25
30
-12 -8 -4 0 4 8 12
Input offset voltage drift [nV/℃]
Number of amplifiers
Output short-circuit current
-50
-40
-30
-20
-10
0
10
20
30
40
50
-40-200 20406080
Temperature [°C]
Output short-circuit current [mA]
Isc-
Isc+
Output short-circuit current
-100
-80
-60
-40
-20
0
20
40
60
80
100
-40-200 20406080
Temperature [°C]
Output short-circuit current [mA]
Isc-
Isc+
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
- 14 -
Package
1. Marking
1.1 TMSOP8
2. Outline Dimensions
2.1 TMSOP8 Package Outline (UNIT:mm)
9
8
(3) (4) (5)
(1)
7 6 5
1 2 3 4
Y 2 0
M A
(2)
(1) Pin Number 1 indication mark
(2) Part Number
(3) Date Code (Year)
(4) Date Code (Month)
(5) Lot Number
M
0.1
4.0±0.1
2.8
2.9+0.12
-0.1
0.65
0.127+0.1
-0.05
0.55±0.2
0~10°
0.9±0.08
0.1 +0.1
-0.05
0.1
0.2 +0.05
-0.03
1
ASAHI KASEI [AK2920]
MS0953-E-01 2011/06
- 15 -
IMPORTANT NOTICE
z These products and their specifications are subject to change without notice.
When you consid er 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 ill u s trat e the operation and application examples of
the semiconductor products. You are fully responsible for the incorporation of these exter nal
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 requ ire an export license o r
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.
