ASAHI KASEI
[AK2920]
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
AK2920T
Channel Number
2
Package
TMSOP8
Pin Location
1:OUTA
2:NINA
8:VDD
A
7:OUTB
B
3:PINA
4:VSS
6:NINB
5:PINB
TMSOP8
(AK2920T)
MS0953-E-01
2011/06
-1-
ASAHI KASEI
[AK2920]
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
Power Supply Current
Symbol
Ta
VDD
Idd1
Min.
-40
2.7
Typ.
0.8
Max.
85
5.5
1.5
Units
°C
V
mA/ch
Conditions
VDD=5.0V,No Load
*We asuumes no responsibility for the usage beyond the conditions in this datasheet.
MS0953-E-01
2011/06
-2-
ASAHI KASEI
[AK2920]
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
110
110
110
Typ.
+/- 1
+/- 2
+/- 100
0.0 –
VDD-0.2
0.03 –
VDD-0.03
130
130
130
+/- 50
+/- 25
VDD:5V, Ta:-40 to 85°C, unless otherwise noted
Max. Units
Conditions
+/- 10
μV
+/- 20 nV/°C
pA
V
V
RL ≥10kΩ connected to VDD/2
dB
dB
dB RL ≥10kΩ connected to VDD/2
mA
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.
2
1
25
0.2
0.1
0.02
1.5
12
MS0953-E-01
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:1V/V
pF
PF
150
pF
2011/06
-3-
ASAHI KASEI
[AK2920]
Typical Operating Characteristics
Supply Current vs. Temperature
(Vin:1/2VDD)
IDD-T emperature
2500
IDD [ A]
2000
1500
1000
2.7V
500
5.0V
0
-40
-20
0
20
40
60
80
T emperature [°C]
Supply Current vs. Supply Voltage
(Vin:1/2VDD)
IDD-VDD
(Ta = 25°C)
2500
IDD [ A]
2000
1500
1000
500
0
0
1
2
3
4
5
6
Supply voltage [V]
MS0953-E-01
2011/06
-4-
ASAHI KASEI
[AK2920]
Output voltage vs. Load current
(VDD=2.7V, Ta=25°C)
Output voltage vs. Load current
(VDD=5V, Ta=25°C)
Isouce / Isink - VOL / VOH
10000
10000
1000
1000
VOL / VOH [mV]
VOL / VOH [mV]
Isource / Isink - VOL / VOH
100
10
1
100
10
1
source
source
0.1
sink
0.1
sink
0.01
0.01
0.0001
0.001
0.01
0.1
1
0.0001
10
0.001
0.01
Closed loop gain vs. Frequency
(VDD=2.7V, Ta=25°C)
70
60
60
Closed loop gain [dB]
Close d loop gain [dB]
50
Av = 100, RL = 2k 40
Av = 10, RL = 2k 20
10
Av = 1, RL = 2k
0
30
10
-20
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
-30
1.E+00
1.E+07
Av = 1, RL = 2k⎠
0
-20
1 .E+01
Av = 10, RL = 2k⎠
20
-10
-30
Av = 100, RL = 2k⎠
40
-10
1.E+00
10
Closed loop gain
70
30
1
Closed loop gain vs. Frequency
(VDD=5V, Ta=25°C)
Closed loop gain
50
0.1
Isource / Isink [mA]
Isource / Isink [mA]
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
Frequency [Hz]
Frequency [Hz]
MS0953-E-01
2011/06
-5-
ASAHI KASEI
[AK2920]
Open loop gain and Phase vs. Frequency
(VDD=2.7V, Ta=25°C)
Open loop gain and Phase vs. Frequency
(VDD=5V, Ta=25°C)
Open loop gain and Phase vs. Frequency
70
Gain
60
180
70
140
60
180
Gain
100
40
60
30
20
20
-20
Phase
50
Open loop gain [dB]
50
Phase [degrees]
Open loop gain [dB]
Phase
100
40
60
30
20
20
-20
10
-60
10
-60
0
-100
0
-100
-10
-140
-10
-140
-180
-20
-20
1.E+03
1.E+04
1.E+05
1.E+06
1.E+03
1.E+07
-180
1.E+04
Output impedance vs. Frequency
(VDD=2.7V, Ta=25°C)
1.E+07
Output impedance vs. Frequency
250
300
Av=1
Av=1
Av=10
Output
Outputimpedance[Ω]
impedance [Ω]
200
1.E+06
Output impedance vs. Frequency
(VDD=5V, Ta=25°C)
Output impedance vs. Frequency
250
1.E+05
Frequency [Hz]
Frequency [Hz]
Outputimpedance[Ω]
impedance[Ω]
Output
140
Phase [degrees]
Open loop gain and Phase vs. Frequency
Av=100
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
200
Av=10
Av=100
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]
Frequency [Hz]
MS0953-E-01
2011/06
-6-
ASAHI KASEI
[AK2920]
Large signal transient response
(VDD/VSS = +1.35V/- 1.35V,
Ta = 25°C, CL = 150pF)
Large signal transient response
(VDD/VSS = +2.5V/-2.5V
Ta = 25°C, CL = 150pF)
Large signal tansient respons
2
4
1.5
3
Output voltage (1V/DIV)
Output voltage (0.5V/DIV)
Large signal transient response
1
0.5
0
-0.5
-1
-1.5
2
1
0
-1
-2
-3
-4
-2
Time (4μs/DIV)
Time (4μsec/DIV)
Small signal transient response
(VDD/VSS = +1.35V/- 1.35V,
Ta = 25°C, CL = 150pF)
Small signal transient response
(VDD/VSS = +2.5V/-2.5V
Ta = 25°C, CL = 150pF)
Small signal transinet response
0.2
0.2
0.15
0.15
Output voltage (50mV/DIV)
Output voltage (50mV/DIV)
Small signal transient response
0.1
0.05
0
-0.05
-0.1
0.1
0.05
0
-0.05
-0.1
-0.15
-0.15
-0.2
-0.2
Time (4μs/DIV)
Time (4μs/DIV)
MS0953-E-01
2011/06
-7-
ASAHI KASEI
[AK2920]
Small signal overshoot vs. Load Capacitance
(VDD=2.7V, Ta=25°C)
Small signal overshoot vs. Load Capacitance
(VDD=5V, Ta=25°C)
Small signal overshoot vs. Load capacitance
Small signal overshoot vs. Load capacitance
50
50
OS+
OS+
40
OS-
OS-
Overshoot [%]
Overshoot [%]
40
30
20
10
0
1.E+00
30
20
10
0
1.E+01
1.E+02
1.E+03
1.E+04
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
Load capacitance [pF]
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)
Positive overvoltage recovery
Av = -50
RL = 10k
CH1 = 1V/DIV
CH2 = 50mV/DIV
Voltage [V]
Voltage [V]
Negative overvoltage recovery
Av = -50
RL = 10k
CH1 = 1V/DIV
CH2 = 50mV/DIV
Time (10μsec/DIV)
Time (10μsec/DIV)
MS0953-E-01
2011/06
-8-
ASAHI KASEI
[AK2920]
Common Mode Rejection Ratio vs. Frequency
CMRR
120
2.7V
100
5.0V
CMRR [dB]
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=2.7V, Ta=25°C)
Power Supply Rejection Ratio vs. Frequency
(VDD=5V, Ta=25°C)
PSRR
PSRR
140
140
2.7V_VDD
120
5.0V_VSS
100
PSRR [dB]
PSRR [dB]
100
80
60
80
60
40
40
20
20
0
1.E+00
5.0V_VDD
120
2.7V_VSS
0
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
Frequency [Hz]
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
Frequency [Hz]
MS0953-E-01
2011/06
-9-
ASAHI KASEI
[AK2920]
Power Supply Rejection Ratio vs. Temperature
(VDD=5V
PSRR - Temperature
130
120
PSRR [dB]
110
100
90
80
70
60
50
-40
10
60
Temperature [°C]
Maximum output swing vs. Frequency
(VDD=2.7V, Ta=25°C, Av = 1, RL = 10kΩ)
Maximum output swing vs. Frequency
(VDD=5V, Ta=25°C, Av = 1, RL = 10kΩ)
Maximum output swing
3
6
2.5
5
Maximum output swing [V]
Maximum output swing [V]
Maximum output swing
2
1.5
1
0.5
0
1.E+01
4
3
2
1
0
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
Frequency [Hz]
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
Frequency [Hz]
MS0953-E-01
2011/06
- 10 -
ASAHI KASEI
[AK2920]
Voltage noise density
(VDD=2.7V, Ta=25°C, f=0~2.5kHz)
Voltage noise density
(VDD=5V, Ta=25°C, f=0~2.5kHz)
Voltage noise density
Voltage noise density
120
Voltage noise density [nV/√Hz]
Voltage noise density [nV/√Hz ]
120
100
80
60
40
20
100
80
60
40
20
0
0
0
500
1000
1500
2000
0
2500
500
1000
Frequency [Hz]
Voltage noise density
(VDD=2.7V, Ta=25°C, f=0~20kHz)
2000
2500
Voltage noise density
(VDD=5V, Ta=25°C, f=0~20kHz)
Voltage noise density
Voltage noise density
120
120
Voltage noise density [nV/√Hz]
Voltage noise density [nV/√Hz]
1500
Frequency [Hz]
100
80
60
40
20
0
100
80
60
40
20
0
0
5000
10000
15000
20000
Frequency [Hz]
0
5000
10000
15000
20000
Frequency [Hz]
MS0953-E-01
2011/06
- 11 -
ASAHI KASEI
[AK2920]
Voltage noise density
(VDD=5V, Ta=25°C, f=1~10kHz)
Voltage noise density
Voltage noise density [nV/√Hz]
100
10
1
10
100
1000
10000
Frequency [Hz]
Voltage noise
(VDD=2.7V, 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
+0.3
+0.3
Vn
+0.2
+0.2
Vn
Voltage [μV]
Voltage [μV]
+0.1
-0.2
-0.1
-0.2
Vn = 0.31μVpp
Vn = 0.18μVpp
-0.3
-0.3
Time (1sec/DIV)
Time (1sec/DIV)
MS0953-E-01
2011/06
- 12 -
ASAHI KASEI
[AK2920]
Output short-circuit current vs. Temperature
(VDD=2.7V, Ta=-40 to 85°C)
Maximum output swing vs. Frequency
(VDD=5V, Ta=25°C, Ta=-40 to 85°C)
Output short-circuit current
50
40
30
20
10
0
-10
-20
-30
-40
-50
Output short-circuit current [mA]
Output short-circuit current [mA]
Output short-circuit current
IscIsc+
-40
-20
0
20
40
60
100
80
60
40
20
0
-20
-40
-60
-80
-100
IscIsc+
-40
80
-20
0
20
40
60
80
Temperature [°C]
Temperature [°C]
Input offset voltage drift(VDD=5V, Ta=25°C, Ta=-40 to 85°C)
Input offset voltage drifft
Number of amplifiers
30
25
20
15
10
5
0
-12
-8
-4
0
4
8
Input offset voltage drift [nV/℃]
12
MS0953-E-01
2011/06
- 13 -
ASAHI KASEI
[AK2920]
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±0.1
2.9 +0.12
-0.1
0.9±0.08
1
0.65
+0.1
0.1 -0.05
0~10°
0.1
0.2
+0.05
-0.03
0.1 M
MS0953-E-01
2011/06
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ASAHI KASEI
[AK2920]
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.
MS0953-E-01
2011/06
- 15 -