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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. (c) 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:support@weltrend.com.tw
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 ORDERING INFORMATION Part Number Package WT272C-N080 8 pin PDIP WT272C-S080 8 pin SO Part Number Package WT274C-N140 14 pin PDIP WT274C-S140 14 pin SO
APPLICATIONS * * * * * Portable Instruments Battery-Powered Systems Transducer Interfacing Active Filter High Impedance Buffer
PIN CONFIGURATION
WT272C
OUTA -IN A +IN A V1 2 3 4 A B 8 7 6 5 V+ OUTB -IN B +IN B OUTA -IN A +IN A V+ +IN B -IN B OUTB 1 2 3 4 5 6 7 B C A D
WT274C
14 13 12 11 10 9 8 OUTD -IN D +IN D V+IN C -IN C OUTC
Weltrend Semiconductor, Inc.
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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 A O C
0
ELECTRICAL CHARACTERISTICS
(V+ = 5V, V- = 0V, Ta = +25 OC unless otherwise specified) Symbol Parameter Condition Min. VOS Input Offset Voltage eVOS/eT 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=1M connected to V- Vin =10mV RL=100K connected to V- Vin =10mV RL=10K connected to V- Vin = -10mV RL=1M, connected to V+ Vin = -10mV RL=100K connected to V+ AVOL Large Signal Voltage Gain VO= 1V to 4V, Vi=1.4V 20 RL=1M GBW Unit Gain Bandwidth RL=1M, 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 m RL=1M, CL=50pF en Input Equivalent Noise Voltage f=1KHz, Rs=100 VO1/VO2 Channel Separation AVOL=100 Typ. 2 0.7 Max. 5 Units mV V/OC
1 1 V+ -1.3 4.99 4.95 4.75 0.5 0.65 100 0.1 80 90 0.03 5 55 50 120 9 0.7
pA pA V V V V V V V/mV MHz dB dB V/s A Degree nV/Hz dB
Weltrend Semiconductor, Inc.
Page 3
WT272C/WT274C
Data Sheet Rev. 1.1
TYPICAL APPLICATION CIRCUIT
Voltage Follower
Instrument Amplifier
1M 100K 500K
100K
INPUT
50K
VOUT
100K 100K 1M
1M V+ V 1M
Weltrend Semiconductor, Inc.
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