ETC WT274C-N140

Weltrend Semiconductor, Inc.
WT272C/WT274C
Dual/Quad Low Power CMOS OP Amplifiers
Data Sheet
REV. 1.1
December 31, 1999
The information in this document is subject to change without notice.
 Weltrend Semiconductor, Inc. All Rights Reserved.
2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419
Email:[email protected]
WT272C/WT274C
Data Sheet Rev. 1.1
DESCRIPTION
The WT272C/WT274C is a dual/quad low power CMOS operational amplifiers IC. It provides high
performance operation at low supply voltages. The basic amplifier can operate at supply voltage as low as
1.2V with very low power consumption and makes it perfect for battery-powered application. The input
common-mode voltage extends to the negative rail. The output swings to both rails with light load. The input
bias current is inherently low and the input impedance is extremely high. The devices are ideal upgrades for
industrial standards OP amp.
FEATURES
•
•
•
•
•
•
•
•
•
Low Power Replacement for Standard OP Amps
Wide supply operating range (1.2V to 7V)
Input common-mode voltage range includes negative rail
Output swing to rail
Low input bias current (typical 1pA)
High input impedance
Single supply operation
Internal compensated
Output short circuit protection
APPLICATIONS
ORDERING INFORMATION
•
•
•
•
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Part Number
Package
WT272C-N080 8 pin PDIP
WT272C-S080 8 pin SO
Portable Instruments
Battery-Powered Systems
Transducer Interfacing
Active Filter
High Impedance Buffer
Part Number
Package
WT274C-N140 14 pin PDIP
WT274C-S140 14 pin SO
PIN CONFIGURATION
WT272C
OUTA
-IN A
+IN A
V-
WT274C
1
8
2
7
3
4
A
6
B
5
V+
OUTA
OUTB
-IN A
-IN B
+IN A
+IN B
V+
+IN B
-IN B
OUTB
Weltrend Semiconductor, Inc.
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1
14
2
13
3
A
D
4
11
5
6
7
12
10
B
C
9
8
OUTD
-IN D
+IN D
V+IN C
-IN C
OUTC
WT272C/WT274C
Data Sheet Rev. 1.1
ABSOLUTE MAXIMUM RATINGS
Parameter
Min.
Max.
0
8.5
DC supply voltage (V+ − V− )
Input and output voltage
V− - 0.3
V+ + 0.3
Storage temperature
-65
150
Ambient temperature with power applied
-20
100
Duration of output short circuit
Unlimited
*Note: Stresses above those listed may cause permanent damage to the devices
Units
V
V
O
C
O
C
RECOMMENDED OPERATING CONDITION
Symbol
VSUPPLY
ISOURCE
ISINK
Ta
Parameter
Supply Voltage
Output Source Current
Output Sink Current
Ambient Temperature
Condition
Min.
1.2
Typ.
Max.
7
5
9
85
Units
V
mA
µA
O
C
Typ.
2
0.7
Max.
5
Units
mV
µV/OC
0
ELECTRICAL CHARACTERISTICS
(V+ = 5V, V− = 0V, Ta = +25 OC unless otherwise specified)
Symbol
Parameter
Condition
Min.
VOS
Input Offset Voltage
êVOS/êT Average
Temperature
Coefficient of Input Offset
Voltage
IOS
Input Offset Current
IBIAS
Input Bias Current
Ta=25 OC
VICOM
Input Common Mode Voltage
0
VOUT
Output Voltage Swing
Vin =10mV
4.9
RL=1MΩ connected to V−
Vin =10mV
RL=100KΩ connected to V−
Vin =10mV
RL=10KΩ connected to V−
Vin = -10mV
RL=1MΩ, connected to V+
Vin = -10mV
RL=100KΩ connected to V+
AVOL
Large Signal Voltage Gain
VO= 1V to 4V, Vi=1.4V 20
RL=1MΩ
GBW
Unit Gain Bandwidth
RL=1MΩ, CL=50pF
CMRR
Common Mode Rejection Ratio V O= 1V, Vi=0 to 3.5V
60
PSRR
Power Supply Rejection Ratio V O= 1V
60
SR
Slew Rate
AVOL=1, CL=100pF
VIN=5VP-P
ISUPPLY
Supply Current (per amplifier)
Phase Margin at Unit Gain
ϕm
RL=1MΩ, CL=50pF
en
Input Equivalent Noise Voltage f=1KHz, Rs=100Ω
VO1/VO2
Channel Separation
AVOL=100
Weltrend Semiconductor, Inc.
Page 3
1
1
4.99
pA
pA
V
V
4.95
V
4.75
V
V+ -1.3
0.5
0.7
V
0.65
V
100
V/mV
0.1
80
90
0.03
MHz
dB
dB
V/µs
5
55
50
120
9
µA
Degree
nV/√Hz
dB
WT272C/WT274C
Data Sheet Rev. 1.1
TYPICAL APPLICATION CIRCUIT
Voltage Follower
Instrument Amplifier
1M
100K
500K
100K
50K
INPUT
VOUT
1M
100K
V+
100K
1M
V
1M
Weltrend Semiconductor, Inc.
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