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TC901 Dual Auto-Zeroed Operational Amplifiers
FEATURES
s Second-Generation Monolithic, Chopper-Stabilized Op Amp s No External Capacitors Required s Single-Supply Operation ........... 15V or 5V to 32V s Supply Current ............................ 450A at 15V, Typ s Input Offset Voltage ................................... 7V, Typ s Common-Mode Rejection Ratio ............ 140dB, Typ s Open-Loop Gain ............ 140dB Into 10k Load, Typ s Input Noise ......................... 5V at 10Hz Bandwidth s Pinout Compatible With ICL7650 s Lowest Parts Count Chopper Op Amp PIN CONFIGURATION (DIP and SOIC)
GENERAL DESCRIPTION
The TC901 is a monolithic, auto-zeroed operational amplifier. It is a second-generation design of the TC91X CMOS chopper-stabilized op-amps with on-chip capacitors. Elimination of the external capacitors allows the designer to increase reliability, lower cost, and simplify design by lowering parts count. Since the TC901 is an auto-zeroing op amp, input offset voltage is very low. More important, there is almost zero drift with time. This eliminates production line adjustments, as well as periodic calibration. Notable electrical characteristics are low supply current (450A, typical), single-supply operation (5V to 32V), low input offset voltage (7V, typical), low noise (<5VP-P, typical, for a 10Hz bandwidth), and fast recovery from saturation without the use of external clamp circuitry. This device is supplied in 8-pin plastic DIP and plastic SOIC packages. It is pin compatible with bipolar, CMOS, JFET and other chopper-stabilized op-amps using the industry-standard 741 pinout.
NC 1 -INPUT 2 +INPUT 3 VSS 4 - + TC901CPA
8 NC 7 VDD 6 OUTPUT 5 NC
NC 1 -INPUT 2 +INPUT 3 VSS 4 - +
8 NC 7 VDD 6 OUTPUT
TC901COA 5 NC
ORDERING INFORMATION
Part No. TC901COA TC901CPA Package 8-Pin SOIC 8-Pin Plastic DIP Temperature Range 0C to +70C 0C to +70C
NC = NO INTERNAL CONNECTION
FUNCTIONAL BLOCK DIAGRAM
VDD 4 VSS 7 VOS CORRECTION AMPLIFIER TC901 A * B B * A +INPUT 3
-INPUT
2
+ -
INTERNAL OSCILLATOR (fOSC 200 Hz)
+ + - MAIN AMPLIFIER -
LOW IMPEDANCE OUTPUT BUFFER
6
OUTPUT
NOTE: Internal capacitors. No external capacitors required.
(c) 2001 Microchip Technology Inc. DS21480A
TC901- 7 9/5/96
Dual Auto-Zeroed Operational Amplifiers
TC901
ABSOLUTE MAXIMUM RATINGS*
Total Supply Voltage (VDD to VSS) ........................... +36V Input Voltage ........................ (VDD + 0.3V) to (VSS - 0.3V) Current Into Any Pin .................................................10mA While Operating ............................................... 100A Storage Temperature Range ................ - 65C to +150C Lead Temperature (Soldering, 10 sec) ................. +300C Operating Temperature Range C Device ................................................ 0C to +70C Package Power Dissipation (TA 70C) Plastic DIP ......................................................730mW Plastic SOIC ................................................... 470mW
*Static-sensitive device. Appropriate precautions should be taken when handling, shipping, or storing these devices. Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the devices. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied.
ELECTRICAL CHARACTERISTICS: VS 15V, TA = +25C, unless otherwise indicated.
Symbol
VOS TCVOS
Parameter
Input Offset Voltage (Figure 2) Average Temperature Coefficient of Input Offset Voltage Average Input Bias Current Average Input Offset Current Input Voltage Noise (Figure 1B) Input Voltage Noise (Figure 1A) Common-Mode Rejection Ratio Common-Mode Voltage Range Open-Loop Voltage Gain Output Voltage Swing Closed-Loop Bandwidth (Figure 7) Slew Rate Power Supply Rejection Ratio Operating Supply Voltage Range Quiescent Supply (Figure 2)
Test Conditions
TA = +25C 0C TA +70C (Note 1) TA = +25C 0C TA +70C - 25C TA +85C TA = +25C TA = +85C 0.1 to 1Hz, RS 100 0.1 to 10Hz, RS 100 VSS VCM VDD - 2V VS = 5V to 15V RL = 10k, VS = 15V RL = 10k Closed-Loop Gain = +1 RL = 10 kW, CL = 50pF VS = 5V to 15V Note 2 VS = 15V
Min
-- --
Typ
7 0.05
Max
15 0.15
Units
V V/C
IBIAS
IOS eN eN CMRR CMVR AOL VOUT BW SR PSRR VS IS
-- -- -- -- -- -- -- 120 VSS 120 VSS + 1 -- -- 120 3 --
30 0.2 0.2 50 -- 1.2 5 140 -- 140 -- 0.8 2 140 -- 0.45
50 10 10 100 1 -- -- -- VDD -2 -- VDD -1.2 -- -- -- 16 0.6
pA nA nA pA nA VP-P VP-P dB V dB V MHz V/sec dB V mA
NOTES: 1. Characterized; not 100% tested. 2. Single supply operation: VDD = +5V to +32V.
TC901- 7 9/5/96
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(c) 2001 Microchip Technology Inc.
DS21480A
Dual Auto-Zeroed Operational Amplifiers
TC901
Overload Recovery
The TC901 recovers quickly from output saturation. Typical recovery time from positive output saturation is 20 msec. Negative output saturation recovery time is typically msec.
Avoiding Latch-Up
Larger voltages can turn the p-n-p-n device on, causing excessive device power supply current and excessive power dissipation. TC901's power supply should be established at the same time (or before) input signals are applied. If this is not possible, input current should be limited to 100A to avoid triggering the p-n-p-n structure.
Thermocouple Errors
Heating a junction made from two different metallic wires causes current flow. This is known as the Seebeck effect. An open-circuit voltage (Seebeck voltage) can be measured across the junction. Junction temperature and metal type determine the magnitude. Typical values are 0.1V/C to 10V/C. Thermal-induced voltages can be many times larger than the TC901's offset voltage drift. Unless unwanted thermocouple potentials can be controlled, system performance will be less than optimum. Unwanted thermocouple junctions are created when leads are soldered or sockets/connectors are used. Low thermoelectric coefficient solder can reduce errors. A 60% Cd/40% Sn Pb solder has one-tenth the thermal voltage of common 64% Sn/36% Pb solder at a copper junction. The number and type of dissimilar metallic junctions in the input circuit loop should be balanced. If the junctions are kept at the same temperature, their summation will add to zero, canceling errors (Figure 7). Shielding precision analog circuits from air currents -- especially those caused by power dissipating components and fans -- will minimize temperature gradients and minimize thermocouple-induced errors.
J3 = J4 J2 = J5 NO TEMPERATURE DIFFERENTIAL AND SAME METALLIC CONNECTION J1 = J6 J2 J1 J3
Pin Compatibility
The CMOS TC901 is pin compatible with other chopperstabilized amplifiers, such as the 7650, 7652 and 1052. Amplifiers such as the 7650 require 0.1F external capacitors connected to pins 1 and 8. The TC901 includes the chopper capacitors on-chip, so external capacitors are not required. Since pins 1, 5 and 8 of the TC901 are not connected, the TC901 can directly replace other chopperstabilized amplifiers in existing circuits. The TC901 pinout also matches many popular bipolar and JFET op amps, such as the OP-07, OP-20, LM101, LM108, 356 and 741. In many applications that operate from 15V power supplies, the TC901 offers superior electrical performance and is a functional pin-compatible replacement. Offset voltage correction potentiometers, compensation capacitors, and chopper-stabilization capacitors can be removed when retrofitting existing equipment designs. System parts count, assembly time, and system cost are reduced, while reliability and performance are improved.
Overload Recovery
The TSC90X Series recovers quickly from output saturation. Typical recovery time from positive output saturation is 20msec. Negative output saturation recovery time is typically 5msec.
PACKAGE PIN
J4
J6
J5 + - J3 V3 + VT = V1 + V2 + V3 - V4 - V5 - V6 = 0 + J4 V 4 - VT = 0 J2 V2 - + J1 V1 -
+
V5 - J5
+
V6 - J6
Figure 7. Unwanted Thermocouple Errors Eliminated by Reducing Thermal Gradients and Balancing Junctions
(c) 2001 Microchip Technology Inc. DS21480A
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TC901- 7 9/5/96
Dual Auto-Zeroed Operational Amplifiers
TC901
(A) 0.1 TO 1.0 Hz 1 V/DIV
2V INPUT 2 V/DIV 0V
0V
(B) 0.1 TO1.0 Hz 1 V/DIV
OUTPUT 5 V/DIV -15V
0
1
2
3
4
5
6
7
8
9
10
5 msec/DIV
1 sec/DIV
Figure 1.
VOS (V) 4 6 9 10 12 14 16 18 20 22 0 2 4 6 8 10 VS (V) 12 14 16 18 20 VOS
Input Voltage Noise
VDD (A) 450 400 350 300 250 200 150 100 50 0
Figure 3. Recovery From Negative Saturation
2V OUTPUT 5 V/DIV
0V
OUTPUT 0V 5 V/DIV -2V
20 msec/DIV
Figure 2.
VOS and IDD vs Supply Voltage
Figure 4. Recovery From Positive Saturation
R2
+50 +40 +30 +240 +180 +120 +60 0C
R1
+15V - OUTPUT + -15V GAIN = 40 R1= 1k R2= 40k
GAIN (dB)
+20 +10 0 -10 -20 -30 -40 0 10 100 1k 10k 100k PHASE MARGIN 10k with 50 pF LOAD 36 at 700 kHz at 70C 40 at 800 kHz at 25C
-120 -180 1M
FREQUENCY (Hz)
Figure 5. Saturation Test Circuit
TC901- 7 9/5/96
Figure 6. Phase-Gain 4
(c) 2001 Microchip Technology Inc. DS21480A
Dual Auto-Zeroed Operational Amplifiers
TC901
PACKAGE DIMENSIONS
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) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40)
8 MAX.
8-Pin Plastic Dip
PIN 1
.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) .040 (1.02)
.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)
(c) 2001 Microchip Technology Inc. DS21480A
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Dual Auto-Zeroed Operational Amplifiers
TC901
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All rights reserved. (c) 2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchipis products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights reserved. All other trademarks mentioned herein are the property of their respective companies.
TC901- 7 9/5/96
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(c) 2001 Microchip Technology Inc.
DS21480A

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