AUTO-ZEROED OPERATIONAL AMPLIFIER Second-Generation Monolithic, C
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MONOLITHIC, AUTO-ZEROED OPERATIONAL AMPLIFIER TC901 TC901
AUTO-ZEROED OPERATIONAL AMPLIFIER
Second-Generation Monolithic, Chopper-Stabilized External Capacitors Required Single-Supply Operation ±15V Supply Current 450µA 15V, Input Offset Voltage 7µV, Common-Mode Rejection Ratio 140dB, Open-Loop Gain 140dB Into Load, Input Noise 10Hz Bandwidth Pinout Compatible With ICL7650 Lowest Parts Count Chopper CONFIGURATION (DIP SOIC)
GENERAL DESCRIPTION
TC901 monolithic, auto-zeroed operational amplifier. second-generation design TC91X CMOS chopper-stabilized op-amps with on-chip capacitors. Elimination external capacitors allows designer increase reliability, lower cost, simplify design lowering parts count. Since TC901 auto-zeroing amp, input offset voltage very low. More important, there almost zero drift with time. This eliminates production line adjustments, well periodic calibration. Notable electrical characteristics supply current (450µA, typical), single-supply operation 32V), input offset voltage (7µV, typical), noise (<5µVP-P, typical, 10Hz bandwidth), fast recovery from saturation without external clamp circuitry. This device supplied 8-pin plastic plastic SOIC packages. compatible with bipolar, CMOS, JFET other chopper-stabilized op-amps using industry-standard pinout.
TC901CPA -INPUT +INPUT OUTPUT -INPUT +INPUT
TC901COA OUTPUT
ORDERING INFORMATION
Part TC901COA TC901CPA Package 8-Pin SOIC 8-Pin Plastic Temperature Range +70°C +70°C
INTERNAL CONNECTION
FUNCTIONAL BLOCK DIAGRAM
CORRECTION AMPLIFIER TC901 +INPUT
-INPUT
INTERNAL OSCILLATOR (fOSC
MAIN AMPLIFIER
IMPEDANCE OUTPUT BUFFER
OUTPUT
NOTE: Internal capacitors. external capacitors required.
TC901- 9/5/96 TelCom Semiconductor reserves right make changes circuitry specifications devices.
MONOLITHIC, AUTO-ZEROED OPERATIONAL AMPLIFIER TC901
ABSOLUTE MAXIMUM RATINGS*
Total Supply Voltage (VDD VSS) +36V Input Voltage (VDD 0.3V) (VSS 0.3V) Current Into .10mA While Operating 100µA Storage Temperature Range 65°C +150°C Lead Temperature (Soldering, sec) +300°C Operating Temperature Range Device +70°C Package Power Dissipation 70°C) Plastic .730mW Plastic SOIC .470mW
*Static-sensitive device. Appropriate precautions should taken when handling, shipping, storing these devices. Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage devices. These stress ratings only functional operation device these other conditions above those indicated operational sections specifications implied.
ELECTRICAL CHARACTERISTICS: ±15V, +25°C, unless otherwise indicated.
Symbol
TCVOS
Parameter
Input Offset Voltage (Figure Average Temperature Coefficient Input Offset Voltage Average Input Bias Current Average Input Offset Current Input Voltage Noise (Figure Input Voltage Noise (Figure Common-Mode Rejection Ratio Common-Mode Voltage Range Open-Loop Voltage Gain Output Voltage Swing Closed-Loop Bandwidth (Figure Slew Rate Power Supply Rejection Ratio Operating Supply Voltage Range Quiescent Supply (Figure
Test Conditions
+25°C +70°C (Note +25°C +70°C 25°C +85°C +25°C +85°C 1Hz, 10Hz, ±15V 10k, ±15V Closed-Loop Gain 50pF ±15V Note ±15V
0.05
0.15
Units
µV/°C
IBIAS
CMRR CMVR VOUT PSRR
0.45
-1.2
µVP-P µVP-P V/µsec
NOTES: Characterized; 100% tested. Single supply operation: +32V.
MONOLITHIC, AUTO-ZEROED OPERATIONAL AMPLIFIER TC901
Overload Recovery
TC901 recovers quickly from output saturation. Typical recovery time from positive output saturation msec. Negative output saturation recovery time typically msec.
Avoiding Latch-Up
Larger voltages turn p-n-p-n device causing excessive device power supply current excessive power dissipation. TC901's power supply should established same time before) input signals applied. this possible, input current should limited 100µA avoid triggering p-n-p-n structure.
Thermocouple Errors
Heating junction made from different metallic wires causes current flow. This known Seebeck effect. open-circuit voltage (Seebeck voltage) measured across junction. Junction temperature metal type determine magnitude. Typical values 0.1µV/°C 10µV/°C. Thermal-induced voltages many times larger than TC901's offset voltage drift. Unless unwanted thermocouple potentials controlled, system performance will less than optimum. Unwanted thermocouple junctions created when leads soldered sockets/connectors used. thermoelectric coefficient solder reduce errors. Cd/40% solder one-tenth thermal voltage common Sn/36% solder copper junction. number type dissimilar metallic junctions input circuit loop should balanced. junctions kept same temperature, their summation will zero, canceling errors (Figure Shielding precision analog circuits from currents especially those caused power dissipating components fans will minimize temperature gradients minimize thermocouple-induced errors.
TEMPERATURE DIFFERENTIAL SAME METALLIC CONNECTION
Compatibility
CMOS TC901 compatible with other chopperstabilized amplifiers, such 7650, 7652 1052. Amplifiers such 7650 require 0.1µF external capacitors connected pins TC901 includes chopper capacitors on-chip, external capacitors required. Since pins TC901 connected, TC901 directly replace other chopperstabilized amplifiers existing circuits. TC901 pinout also matches many popular bipolar JFET amps, such OP-07, OP-20, LM101, LM108, 741. many applications that operate from ±15V power supplies, TC901 offers superior electrical performance functional pin-compatible replacement. Offset voltage correction potentiometers, compensation capacitors, chopper-stabilization capacitors removed when retrofitting existing equipment designs. System parts count, assembly time, system cost reduced, while reliability performance improved.
Overload Recovery
TSC90X Series recovers quickly from output saturation. Typical recovery time from positive output saturation 20msec. Negative output saturation recovery time typically 5msec.
PACKAGE
Figure Unwanted Thermocouple Errors Eliminated Reducing Thermal Gradients Balancing Junctions
MONOLITHIC, AUTO-ZEROED OPERATIONAL AMPLIFIER TC901
µV/DIV
INPUT V/DIV
TO1.0 µV/DIV
OUTPUT V/DIV -15V
msec/DIV
sec/DIV
Figure
(µV)
Input Voltage Noise
(µA)
Figure Recovery From Negative Saturation
OUTPUT V/DIV
OUTPUT V/DIV
msec/DIV
Figure
Supply Voltage
Figure Recovery From Positive Saturation
+240 +180 +120
+15V OUTPUT -15V GAIN
GAIN (dB)
100k PHASE MARGIN with LOAD 70°C 25°C
-120 -180
FREQUENCY (Hz)
Figure Saturation Test Circuit
Figure Phase-Gain
MONOLITHIC, AUTO-ZEROED OPERATIONAL AMPLIFIER TC901
PACKAGE DIMENSIONS
indicated beveled edge
8-Pin SOIC Narrow
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.050 (1.27) TYP.
.197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .018 (0.46) .010 (0.25) .014 (0.36) .004 (0.10) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40)
8°MAX.
8-Pin Plastic
.260 (6.60) .240 (6.10)
.045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92)
.070 (1.78) .045 (1.14)
.310 (7.87) .290 (7.37)
.040 (1.02) .020 (0.51)
.015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87)
3°MIN.
.110 (2.79) .090 (2.29)
.022 (0.56) .015 (0.38)
Dimensions: inches (mm)
Sales Offices
TelCom Semiconductor 1300 Terra Bella Avenue P.O. 7267 Mountain View, 94039-7267 TEL: 650-968-9241 FAX: 650-967-1590 E-Mail: liter@c2smtp.telcom-semi.com TelCom Semiconductor Austin Product Center 9101 Burnet Suite Austin, 78758 TEL: 512-873-7100 FAX: 512-873-8236 TelCom Semiconductor H.K. Ltd. Chuk Street, Ground Floor Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957
Printed U.S.A
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