AK2973H

Preliminary
[AK2973]
AK2973
Zero Drift operational amplifiers
1.
Device Outline
AK2973 is the dual channel CMOS operational amplifires which is available to output with very low input
offset voltage (± 10V) and near zero input offset dirft.
It’s operated with very small current consumptions, 17μA/ch. Typ.(VDD:5.0V), which is available to
operate full swing signals in input and output.
AK2973 is appropriate to portable Sensor Pre Amp. applications.
2.
Feature
 Wide Supply Operation Range: 1.6V ~ 5.5V (±0.8V ~ ±2.75V)
 Very Low Input Offset Voltage : ±1V typ.
 Near Zero Dirft over time and temperature : ±10nV/C typ.
 Input Rabge : VSS to VDD
 Full Swing Outputs to 50k Load @[VDD/2]
 Power Supply Current : 34μA typ.(VDD: 5.0V, No Load)
 Gain Bandwidth : 80kHz typ.
 Slew Rate : 30mV/sec typ.
 Operating Temperature Range : -40 ~ 125C
 Package : MSOP8
Part Name
AK2973H
Channel Number
2
3.
Pin Location
1:OUTA
2:NINA
Package
MSOP8
8:VDD
A
7:OUTB
B
3:PINA
4:VSS
6:NINB
5:PINB
MSOP8
（AK2973H）
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Preliminary
4.
[AK2973]
Table of contents
1.
Device Outline ..................................................................................................................................................... 1
2.
Feature .................................................................................................................................................................1
3.
Pin Location......................................................................................................................................................... 1
4.
Table of contents.................................................................................................................................................. 2
5.
Pin Function Descriptions....................................................................................................................................2
6.
Absolute Maximum Ratings ................................................................................................................................ 2
7.
Recommended Operating Conditions .................................................................................................................. 3
8.
Electrical Characteristics .....................................................................................................................................3
9.
Typical Operating Characteristics (for reference) ............................................................................................... 6
10. Restriction of Comparator Operation.................................................................................................................15
11. Notes for a board design ....................................................................................................................................15
12. Package .............................................................................................................................................................. 16
13. Ordering Guide .................................................................................................................................................. 17
5.
Pin number
1
2
3
4
5
6
7
8
Note
* 1. PWR
AI
AO
Name
OUTA
NINA
PINA
VSS
PINB
NINB
OUTB
VDD
Pin Function Descriptions
I/O ( * 1 )
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
: Power Supply
: Analog Input
: Analog Output
6.
Absolute Maximum Ratings
Parameter
Symbol
Supply Voltage
VDD
Input Voltage
VTD
Input Current
IIN
Storage Temperature Range
Tstg
Note
* 2. All voltage with respect to VSS(ground).
Min
-0.3
-0.3
-10
-65
Max
6.5
VDD + 0.3
+10
150
( VSS = 0V, * 2 )
Units
V
V
mA
C
[ WARNING ] Operational at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
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Preliminary
7.
[AK2973]
Recommended Operating Conditions
Parameter
Operationg Temperature Range
Ground level
(* 2)
Supply Voltage
Symbol
Ta
VSS
VDD
Min.
-40
0
1.6
Typ.
0
Max.
125
0
5.5
Units
C
V
V
( VSS = 0V, * 2 )
Conditions
[ WARNING ] We asuumes no responsibility for the usage beyond the conditions in this datasheet.
8.
Electrical Characteristics
 DC Characteristics (typ. : VDD=5V,VCM=VDD/2 (* 3) , Ta=25°C)
VDD=1.6V~5.5V, Vcm=VDD/2, Ta=-40~125°C, unless otherwise noted
Item
Symbol
Condition
min
typ
max
Unit
Input Voltage Offset
VIO
VCM = VDD/2 (* 3)
±1
±10
V
Input Voltage Offset Drift
VIOD
(* 4)
±10
±50
nV/C
Input Bias Current
IS
±10
±200
pA
Input Common Mode
VICM
VSS
VDD
V
Range
Output Voltage Swing
VOM RL50kΩ (@VDD/2)
0.05
VDD-0.05
V
Common Mode Rejection
CMR VSS ≤ Vcm ≤ VDD
100
130
dB
Ratio (* 5)
Power Supply Rejection
SVR VDD = 1.6V to 5.5V
110
130
dB
Ratio (* 6)
Large Signal Voltage Gain
Av
0.1 V< Vout < VDD-0.1V
100
130
dB
(* 7)
RL  50kΩ(to VDD/2)
Output short current
IOS
Isource: Vout node forced Vdd
7
mA
Isink: Vout node forced Vss
Output current
IO
Isource: Vcm=Vdd
3
mA
Vout node forced Vdd-1
Isink: Vcm=Vss
Vout node forced Vss+1
Power Supply Current
Idd
Vcm=Vout=VDD/2
34
60
μA
(* 8)
Notes
* 3. VCM means the common voltage of an input pin (PIN/NIN).
* 4. VIOD = [( high temperature side WST(**)) –( low temperature side WST(**))]/[125°C－(－40°C)）]
** WST is MIN. or MAX. value of VIO .
ex.) If high temperature side is MAX. and low temperature side is MIN. the VIOD polarity is positive.
And if high temperature side is MIN. and low temperature side is MAX. the VIOD polarity is
negative.
* 5. CMRR = 20 x Log[ (VDD-VSS) / ( α ) ]
‘( α ) is a Max. value among [(Offset at input = VDD)-(Offset at Input = VSS)] and
[(Offset at input = VDD)-( Offset at input = VDD/2)] and
[(Offset at input = VDD/2)-( Offset at input = VSS)].
* 6. PSRR = 20 x Log[(Max. supply voltage – Min. supply voltage) / (Offset at Max. supply voltage –
Offset at Min. supply voltage)]
* 7. AV = 20×LOG [ ((VDD-0.1)－(VSS+0.1)) / ((Offset at output= VDD－0.1) －
(Offset at output = VSS+0.1)）]
* 8. It contains consumption of two OPAmp circuits. It doesn't include an output drive current.
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 AC Characteristics (Typ. VDD= 5V, VCM= VDD/2, Ta= 25ºC)
VDD:1.6~5.5V, VCM= VDD/2, VSS=0V, Ta= -40~125ºC, unless otherwise noted
Item
Symbol
Condition
min
typ
max
Unit
Gain Bandwidth
GB
80
kHz
Slew Rate
SR
AV=1
30
mV/s
Vin=4Vpp
CL=100pF
10%-90%
Input Voltage Noise
VNI1
@1kHz
200
nVrms
/√Hz
VNI2
0.1~10Hz (* 9)
4.2
Vpp
VNI3
0.1~1Hz (* 10)
1.3
Vpp
Overload Recovery
TOR
80
sec
Av=-10, Load: 20pF
Time
(* 11)
Vin: 2.0V (±2.5V)@90%
Input
Diff.
capacitance common
Maximum Capacitance
Loads
CIND
CINC
CL
18
30
100
pF
pF
pF
Notes.
* 9. VNI2 is calculated by the following numerical expression from VNI1.
VNI2 = 200nVrms/√Hz × (10Hz − 0.1Hz)× 6.6 = 4.16µVpp
* 10. VNI3 is calculated by the following numerical expression from VNI1.
VNI3 = 200nVrms/√Hz × (1Hz − 0.1Hz)× 6.6 = 1.26µVpp
* 11. The definition of “Overload Recovery Time”
- Positive side overload recovery time (Time until it returns to VDD/2 from VDD saturation)
Figure 8.1 Positive side overload recovery time
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- Negative side overload recovery time (Time until it returns to VDD/2 from VSS saturation)
Figure 8.2 Negative side overload recovery time
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9.
[AK2973]
Typical Operating Characteristics (for reference)
■Current consumption - Operationg temperature characteristic (Vin,Vout:VDD/2)
Figure 9.1 Current consumption vs. Operationg temperature
■Current consumption – Power supply Voltage characteristic (Vin,Vout:VDD/2)
Figure 9.2 Current consumption vs. Power supply Voltage
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[ 9. Typical Operating Characteristics (for reference) continuation]
■Output voltage – Output current characteristic
(VDD=1.6V、Ta=25°C)
■Output voltage – Output current characteristic
(VDD=5V、Ta=25°C)
Figure 9.3 Output voltage vs. Output current
■Closed loop gain – frequency characteristic
(VDD=1.6V , Ta=25°C)
■Closed loop gain – frequency characteristic
(VDD=1.6V , Ta=25°C)
Figure 9.4 Closed loop gain vs. Frequency
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[ 9. Typical Operating Characteristics (for reference) continuation]
■Open loop gain/phase – frequency characteristic
■Open loop gain/phase – frequency characteristic
(VDD=1.6V、Ta=25°C)
(VDD=5V、Ta=25°C)
Figure 9.5 Open loop gain/phase vs. Frequency
■Output impedance – frequency characteristic
(VDD=1.6V , Ta=25°C)
■Output impedance – frequency characteristic
(VDD=5.0V , Ta=25°C)
Figure 9.6 Output impedance vs. Frequency
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[ 9. Typical Operating Characteristics (for reference) continuation]
■Large signal pulse response
(VDD/VSS=+0.8V / -0.8V, Ta=25°C,CL=100pF)
■Large signal pulse response
(VDD/VSS=+2.5V / -2.5V, Ta=25°C , CL=100pF)
Figure 9.7 Large signal pulse response
■Small signal pulse response
(VDD/VSS=+0.8V / -0.8V, Ta=25°C,CL=100pF)
■Small signal pulse response
(VDD/VSS=+2.5V / -2.5V, Ta=25°C , CL=100pF)
Figure 9.8 Small signal pulse response
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[AK2973]
[ 9. Typical Operating Characteristics (for reference) continuation]
■Negative side overload recovery time
(VDD/VSS=+2.5V/-2.5V , Ta=25°C)
■Negative side overload recovery time
(VDD/VSS=+2.5V/-2.5V , Ta=25°C)
Figure 9.9 Positive side overload recovery time
Figure 9.10
time
Negative side overload recovery
■CMRR characteristic
Figure 9.11 CMRR vs. Frequency
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[AK2973]
[ 9. Typical Operating Characteristics (for reference) continuation]
■PSRR (VDD=1.6V , Ta=25°C)
■PSRR (VDD=5.0V , Ta=25°C)
Figure 9.12 PSRR vs. Frequency
■Max. output voltage – frequency characteristic
(VDD =1.6V, Ta=25°C,Av=1 , RL=47kΩ)
■Max. output voltage – frequency characteristic
(VDD =5V, Ta=25°C,Av=1 , RL=47kΩ)
Figure 9.13 Max. output voltage vs. Frequency
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Preliminary
[AK2973]
[ 9. Typical Operating Characteristics (for reference) continuation]
■Input voltage noise – frequency characteristic
(VDD=1.6V , Ta=25°C , f=1~10kHz)
■Input voltage noise – frequency characteristic
(VDD=5.0V , Ta=25°C , f=1~10kHz)
Figure 9.14 Input voltage noise vs. Frequency
■Output short current – temperature characteristic
■Output short current – temperature
characteristic
(VDD =1.6V , Ta=-40 to 125°C)
(VDD =5.0V , Ta=-40 to 125°C)
Figure 9.15 Output short current vs. Temperature
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[AK2973]
[ 9. Typical Operating Characteristics (for reference) continuation]
■Output short current – power supply characteristic
Figure 9.16 Output short current vs. Supply voltage
■Input Bias current - temperature
Figure 9.17 Input Bias current vs. Temperature
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[AK2973]
[ 9. Typical Operating Characteristics (for reference) continuation]
■Input offset voltage – temperature characteristic
Figure 9.18 Input offset voltage vs. Temperature
■Distribution of Input offset drift (VDD=5V , Ta=-40 to 125°C)
Figure 9.19 Distribution of Input offset drift
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[AK2973]
10. Restriction of Comparator Operation
Although an operational amplifier may be used as a comparator, in case of AK8473 this is not
recommended.
In order that AK2973 may realize low power consumption, the output stage is designed optimally.
The output stage is adjusting consumption current by closing a loop. But, since the loop does not close
when AK2973 is used by an open-loop, adjustment of consumption current may become impossible.
Therefore, as shown in this Figure 10.1, consumption current may become very large if this is used as
a comparator.
In addition, even when designed as a voltage follower(BUFFER), In the outside of the range of large
amplitude voltage gain conditions[ 0.1V<Vout<VDD-0.1V ], since the element of an output stage
separates from a saturated area and a loop does not close, consumption current may become large.
Figure 10.1 Current consumption vs. Supply voltage
11. Notes for a board design
The features of AK2973 are a maximum of ±10μV, super-low offset, and a zero drift. Therefore, also in
a board design, especially cautions are required. In an unsuitable board layout, it has big influence on the
characteristic.
11.1. About connection of a decoupling capacitor
If AK2973 is influenced to the impedance and inductance of a power supply, the characteristic may
deteriorate. If possible, please connect the decoupling capacitor between power supplies near the
power supply pin.
11.2.
About the Seebeck effect
The thermoelectric voltage which occurs in the connection of a different metal is known as the
Seebeck effect. On a board, it generates in the bonded surface of solder, substrate wiring, a pin, etc.
Therefore, please take care that a difference in temperature does not occur over the whole substrate.
If the Seebeck effect occurs, AK2973 will amplify this voltage. In order to prevent this, keep a thermal
equilibrium state and be careful also about the leak path on a board.
A) Lay out dummy parts. (Make environment of a difference input terminal the same.)
B) Lay out a guard ring for differential input pin.
C) Lay out a ground plane etc. and extend heat on the whole board.
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Preliminary
[AK2973]
12. Package
12.1 Marking
-
MSOP8
8
7
6
5
2973
(2)
Y WW A
(1)
(3)
1
2
(4)
3
(1) 1 pin
(2) Part No.（AK2973:2973）
(3) Date code (Year)
(4) Date code (Week)
(5) In-house control code
(5)
4
12.2 Outline Dimensions
-
MSOP8 Package Outline
( UNIT: mm )
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Preliminary
[AK2973]
13. Ordering Guide
AK2973H
-40 ~ 125°C
8-pin MSOP
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[AK2973]
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the information
contained in this document without notice. When you consider any use or application of AKM product
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