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Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER General Description
The AS321 is a high gain and internally frequency compensated operational amplifier specifically designed to operate from a single power supply. Operation from split power supply is also possible and the low power supply current drain is independent of the magnitude of the power supply voltages. Typical applications include battery charger, active filters, general purpose controllers and most conventional operational amplifier circuits. The AS321 is compatible with industry standard 321. The AS321 is available in SOT-23-5L packages.
AS321
Features
* * * * * * Excellent Phase Margin: 60 deg. Large Voltage Gain: 100dB (Typical) Low Input Bias Current: 20nA (Typical) Low Input Offset Voltage: 2mV (Typical) Low Supply Current: 0.35mA at VCC=5V Wide Power Supply Voltage: Single Supply: 3V to 36V Dual Supplies: 1.5V to 18V Wide Input Common Mode Voltage Range: 0V to VCC-1.5V
*
Applications
* * * Battery Charger Active Filters General Purpose Controllers, Instruments
SOT-23-5L
Figure 1. Package Type of AS321
Jul. 2006 Rev. 1. 0 1
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Pin Configuration
K Package (SOT-23-5L)
INPUT + VEE INPUT 1 2 3 4 OUTPUT 5 VCC
AS321
Figure 2. Pin Configuration of AS321 (Top View)
Functional Block Diagram
VCC 6A 4A 100A
Q5 Q6 Q2 INPUTQ1 Q3 Q4 Rsc OUTPUT INPUT+ Q10 Q8 Q9 Q11 Q12 50A Q13 Cc Q7
VEE
Figure 3. Functional Block Diagram of AS321
Jul. 2006 Rev. 1. 0 2
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Ordering Information
AS321 Circuit Type Package K: SOT-23-5L
AS321
E1: Lead Free TR: Tape and Reel
Package SOT-23-5L
Temperature Range -40 to 85oC
Part Number Lead Free AS321KTR-E1
Marking ID Lead Free E6T
Packing Type Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Absolute Maximum Ratings (Note 1)
Parameter Power Supply Voltage Differential Input Voltage Input Voltage Thermal Resistance to Ambient Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) Symbol VS (VCC-VEE) VID VIN R JA TJ TSTG TLEAD Value 40 40 -0.3 to 40 260 150 -65 to 150 260 Unit V V V
oC/W oC oC o
C
Note 1: Stresses greater than 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 under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter Supply Voltage Ambient Operating Temperature Range Symbol VCC TA Min 3 -40 Max 36 85 Unit V
oC
Jul. 2006 Rev. 1. 0 3
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Electrical Characteristics
Limits in standard typeface are for TA=25oC, bold typeface applies over -40oC to 85oC (Note 2), VCC=5V, VEE=0V, VO=1.4V unless otherwise specified. Parameter Input Offset Voltage Average Temperature Coefficient of Input Offset Voltage Input Bias Current Input Offset Current Input Common Mode Voltage Range (Note 4) Symbol VIO Conditions VO=1.4V, RS=0, VCC=5V to 30V (Note 3) Min Typ 2 Max 5 7 7 20 5 100 200 30 100 0 0.35 0.45 0.45 0.65 85 80 60 60 70 60 20 20 10 5 12 50 40 26 26 27 27 5 20 30 mV 28 V 60 15 40 100 70 100
VCC-1.5
AS321
Unit mV V/oC nA nA V mA mA dB dB dB mA mA A mA
VIO/T TA=-40 to 85oC IBIAS IIO VCM IIN+ or IIN-, VCM=0V IIN+ - IIN-, VCM=0V VCC=30V, CMRR50dB RL=, VCC=5V
0.80 1.0 1.2 1.5
Supply Current
ICC RL=, VCC=30V
Large Signal Voltage Gain Common Ratio Power Ratio Mode Supply Rejection Rejection
GV CMRR PSRR
VCC=15V, VO=1V to 11V, RL2k VCM=0V to (VCC-1.5)V, RS10k VCC=5V to 30V, RS10k
Source Output Current Sink
ISOURCE VIN+=1V, VIN-=0V, VCC=15V, VO=2V VIN+=0V, VIN-=1V, VCC=15V, VO=2V VIN+=0V, VIN-=1V, VCC=15V, VO=0.2V
ISINK
Output Short Circuit Current to Ground
ISC
VCC=15V VCC=30V, RL=2k
VOH Output Voltage Swing VOL VCC=30V, RL=10k VCC=5V, RL= 10k
Jul. 2006 Rev. 1. 0 4
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Electrical Characteristics (Continued)
Limits in standard typeface are for TA=25oC, bold typeface applies over -40oC to 85oC (Note 2), VCC=5V, VEE=0V, VO=1.4V unless otherwise specified. Parameter Total Harmonic Distortion Phase Margin Symbol THD Conditions f=1kHZ, AV=20dB, RL=2k, VO=2Vp-p, CL=100pF, VCC=30V Min Typ 0.015 60 Max Unit % Deg
AS321
M
Note 2: Limits over the full temperature are guaranteed by design, but not tested in production. Note 3: Over the full input common-mode range 0V to VCC-1.5V(at 25oC). Note 4: The input common-mode voltage of either input signal voltage should not be allowed to go negatively by more than 0.3V (at 25oC). The upper end of the common-mode voltage range is VCC-1.5V (at 25oC), but either or both inputs can go to +36V without damages, independent of the magnitude of the VCC.
Typical Performance Characteristics
15
20 18 16
Input Voltage (+VDC)
10
Input Current (nA)
14 12 10 8 6 4 2
NEGATIVE
POSITIVE
5
0 0 5 10 15
0 -25 0 25 50
o
75
100
125
Power Supply Voltage (+VDC)
Temperature ( C)
Figure 4. Input Voltage Range
Figure 5. Input Current
Jul. 2006 Rev. 1. 0 5
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Electrical Characteristics (Continued) AS321
1.0 0.9 0.8
120
105
Supply Current (mA)
0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 5 10 15 20 25 30 35 40
Voltage Gain (dB)
0.7
90
RL=2K RL=20K
75
60 0 8 16 24 32 40
Supply Voltage (V)
Power Supply Voltage (V)
Figure 6. Supply Current
Figure 7. Voltage Gain
80 VCC=30V, VEE=0V RL=2k, CL=100pF
4
60
Output Voltage (V) Input Voltage (V)
3 2 1 0 3 2 1 0 0 4 8 12 16 20 24 28 32 36 40
Open Loop Gain (dB)
40
20
0
-20
0.2k
1k
10k
100k
1M 2M
Frequency (Hz)
Time (s)
Figure 8. Open Loop Gain vs.Frequency
Figure 9. Voltage Follower Pulse Response
Jul. 2006 Rev. 1. 0 6
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Typical Performance Characteristics (Continued) AS321
800 700
20
Output Voltage (mV)
600 500 400 300 200 100 0 4
Output Swing (V)
15
10
5
8
12
16
20
0 1k
10k
100k
1M
Time (s)
Frequency (Hz)
Figure 10. Voltage Follower Pulse Response (Small Signal)
Figure 11. Large Signal Frequency Response
8
10
Output Voltage Referenced to Vcc (V)
7 6 5 4 3 2 1 0 0.1
Output Voltage (V)
1
VCC=5V
0.1
VCC=15V
1
10
100
0.01 1E-3
0.01
0.1
1
10
100
Output Source Current (mA)
Output Sink Current (mA)
Figure 12. Output Characteristics: Current Sourcing
Figure 13. Output Characteristics: Current Sinking
Jul. 2006 Rev. 1. 0 7
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Typical Performance Characteristics (Continued) AS321
100 90 80
Output Current (mA)
70 60 50 40 30 20 10 0 -25 0 25 50
o
75
100
125
Temperature ( C)
Figure 14. Current Limiting
Typical Application
R1 910K
R1 100k
R2 100K AS321 R3 91K VIN(+) + RL VO VCC
+V1 +V2 R2 100k R3 100k +V3 +V4 R4 100k R5 100k
+ AS321 R6 100k VO
Figure 16. Power Amplifier
Figure 17. DC Summing Amplifier
Jul. 2006 Rev. 1. 0 8
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Typical Application (Continued) AS321
R1 100k C1 0.1F
R2 1M
VCC + 2V + 2V -
-
CO
AS321
+ CIN AC R3 1M R4 100k VCC R5 100k AV=1+R2/R1
VO RL 10k
R3 2K
R1 2K
R2
RB 6.2k
AS321 + R4 3K I1 1mA I2
C2 10F
AV=11 (As shown)
Figure 18. AC Coupled Non-Inverting Amplifier
Figure 19. Fixed Current Sources
R1
1M
C1 0.01F
0.001F
R2 100K
R1 16K R2 16K + C2 0.01F AS321 R3 100k VO
VO
VIN
AS321
+ R3 100K VCC R4 100 K
0 f0
R5 100K
V0 R4 100k fo=1KHz Q=1 AV=2
Figure 20. Pulse Generator
Figure 21. DC Coupled Low-Pass Active Filter
Jul. 2006 Rev. 1. 0 9
BCD Semiconductor Manufacturing Limited
Data Sheet LOW POWER SINGLE OPERATIONAL AMPLIFIER Mechanical Dimensions SOT-23-5L Unit: mm(inch) AS321
2.820(0.111) 3.020(0.119)
0.100(0.004) 0.200(0.008)
2.650(0.104)
2.950(0.116)
1.500(0.059) 1.700(0.067)
0.200(0.008)
0.700(0.028) REF
0.950(0.037) TYP
0.300(0.012) 0.400(0.016) 1.800(0.071) 2.000(0.079)
0.300(0.012) 0.600(0.024)
0 8
1.050(0.041)
1.250(0.049)
0.000(0.000) 0.100(0.004)
1.050(0.041) 1.150(0.045)
Jul. 2006 Rev. 1. 0 10
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others.
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REGIONAL SALES OFFICE
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