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TC911A TC911B Monolithic Auto-Zeroed Operational Amplifers
FEATURES
s s s s s s s s s s s s First Monolithic Chopper-Stabilized Amplifier With On-Chip Nulling Capacitors Offset Voltage .................................................... 5V Offset Voltage Drift .................................. 0.05V/C Low Supply Current ...................................... 350A High Common-Mode Rejection .................... 116dB Single Supply Operation ....................... 4.5V to 16V High Slew Rate ......................................... 2.5V/sec Wide Bandwidth ............................................ 1.5MHz High Open-Loop Voltage Gain (RL = 10k) ..................................................... 120dB Low Input Voltage Noise (0.1Hz to 1Hz) ............................................ 0.65VP-P Pin Compatible With ICL7650 Lower System Parts Count
GENERAL DESCRIPTION
The TC911 CMOS auto-zeroed operational amplifier is the first complete monolithic chopper-stabilized amplifier. Chopper operational amplifiers like the ICL7650/7652 and LTC1052 require user-supplied, external offset compensation storage capacitors. External capacitors are not required with the TC911. Just as easy to use as the conventional OP07 type amplifier, the TC911 significantly reduces offset voltage errors. Pinout matches the OP07/ 741/7650 8-pin mini-DIP configuration. Several system benefits arise by eliminating the external chopper capacitors: lower system parts count, reduced assembly time and cost, greater system reliability, reduced PC board layout effort and greater board area utilization. Space savings can be significant in multiple-amplifier designs. Electrical specifications include 15V maximum offset voltage, 0.15V/C maximum offset voltage temperature coefficient. Offset voltage error is five times lower than the premium OP07E bipolar device. The TC911 improves offset drift performance by eight times. The TC911 operates from dual or single power supplies. Supply current is typically 350A. Single 4.5V to 16V supply operation is possible, making single 9V battery operation possible. The TC911 is available in 2 package types: 8-pin plastic DIP and SOIC. PIN CONFIGURATION (SOIC and DIP)
NC 1 - INPUT 2 + INPUT 3 VSS 4 TC911ACPA TC911BCPA 8 NC 7 VDD 6 OUTPUT 5 NC NC 1 - INPUT 2 + INPUT 3 VSS 4 8 NC 7 VDD TC911ACOA TC911BCOA 6 OUTPUT 5 NC
ORDERING INFORMATION
Temperature Range
0C to +70C 0C to +70C 0C to +70C 0C to +70C
Part No.
TC911ACOA TC911ACPA TC911BCOA TC911BCPA
Package
8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP
Maximum Offset Voltage
15V 15V 30V 30V
FUNCTIONAL BLOCK DIAGRAM
VDD 4 VSS 7 V CORRECTION AMPLIFIER OS A - B B
NC = NO INTERNAL CONNECTION
-INPUT
2
+
INTERNAL OSCILLATOR (fOSC 200 Hz)
* *
A +INPUT 3 +
TC911 LOW IMPEDANCE OUTPUT BUFFER
+ - MAIN AMPLIFIER -
6
OUTPUT
*NOTE: Internal capacitors. No external capacitors required.
(c) 2001 Microchip Technology Inc. DS21481A
TC911/A/B-7 9/11/96
Monolithic Auto-Zeroed Operational Amplifers TC911A TC911/B
ABSOLUTE MAXIMUM RATINGS*
Total Supply Voltage (VDD to VSS) ........................... +18V 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. Unused devices should be stored in conductive material. Stresses above 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 above those indicated in the operational sections of the specifications is not implied.
ELECTRICAL CHARACTERISTICS: VS = 5V, TA = +25C, unless otherwise indicated.
Symbol Parameter
VOS TCVOS Input Offset Voltage Average Temperature Coefficient of Input Offset Voltage Average Input Bias Current Average Input Offset Current Input Voltage Noise Common-Mode Rejection Ratio Common-Mode Voltage Range Open-Loop Voltage Gain Output Voltage Swing Closed Loop Bandwidth Slew Rate Power Supply Rejection Ratio Operating Supply Voltage Range Quiescent Supply Current
Test Conditions
TA = +25C 0C TA +70C -25C TA +85C (Note 1) TA = +25C 0C TA +70C -25C TA +85C TA = +25C TA = +85C 0.1 to 1 Hz, RS 100 0.1 to 10 Hz, RS 100 VSS VCM VDD - 2.2
Min
-- -- -- -- -- -- -- -- -- -- 110 VSS
TC911A Typ
5 0.05 0.05 -- -- -- 5 -- 0.65 11 116 -- 120 -- 1.5 2.5 -- -- -- 350
Max
15 0.15 0.15 70 3 4 20 1 -- -- -- VDD - 2 -- VDD - 0.9 -- -- -- 8 16 600
Min
-- -- -- -- -- -- -- -- -- -- 105 VSS 110 VSS + 0.3 -- -- 105 3.3 6.5 --
TC911B Typ
15 0.1 0.1 -- -- -- 10 -- 0.65 11 110 -- 120 -- 1.5 2.5 -- -- -- --
Max
30 0.25 0.25 120 4 6 40 1 -- -- -- VDD -2 -- VDD - 0.9 -- -- -- 8 16 800
Unit
V V/C V/C pA nA nA pA nA VP-P VP-P dB V dB V MHz V/sec dB V V A
IB
IOS eN CMRR CMVR AOL VOUT BW SR PSRR VS IS
RL = 10 k, VOUT = 4V
115
RL = 10 k VSS + 0.3 Closed Loop Gain = +1 -- RL = 10 k, CL = 50pF 3.3V to 5.5V Split Supply Single Supply VS = 5V -- 112 3.3 6.5 --
NOTES: 1. Characterized; not 100% tested.
2
(c) 2001 Microchip Technology Inc.
DS21481A
Monolithic Auto-Zeroed Operational Amplifers TC911A TC911B
TYPICAL CHARACTERISTICS
Supply Current vs. Supply Voltage
700 600 TA = +25C 450
Supply Current vs. Temperature
VS = 5V 35
Input Offset Voltage vs. Common-Mode Voltage
VS = 5V
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
400
INPUT OFFSET VOLTAGE (V)
30 25 20 15 10 5 0
TA = +25C
500 400 300 200 100 0 2 3 4 5 6 7 SUPPLY VOLTAGE (V) 8
350
300
250
200 -100
-50 0 50 100 AMBIENT TEMPERATURE (C)
150
-6 -5 -4 -3 -2 -1 0 1 2 3 4 INPUT COMMON-MODE VOLTAGE (V)
Gain and Phase vs. Frequency
50 40 PHASE GAIN VS = 5V TA = +25C RL = 10 k 225 180 135
Large Signal Output Switching Waveform
5.8 RL = 10 k TA = +25C
Output Voltage Swing vs. Load Resistance
TA = +25C VS = 5V
CLOSED-LOOP GAIN (dB)
PHASE (deg)
20 10 0
90 45 0
OUTPUT VERTICAL SCALE = 1 V/DIV 0V
OUTPUT VOLTAGE (V)
30
INPUT VERTICAL SCALE = 2 V/DIV
5.0 4.2 3.4 2.6 1.8
-SWING
+SWING
-10 -20
-45 -90 -135 100k 1M FREQUENCY (Hz) -180 10M HORIZONTAL SCALE = 2 s/DIV
-30 -40 10k
1.0 100
1k
10k
100k
1M
LOAD RESISTANCE ()
(c) 2001 Microchip Technology Inc.
DS21481A
3
Monolithic Auto-Zeroed Operational Amplifers TC911A TC911/B
Pin Compatibility
The CMOS TC911 is pin compatible with the industry standard ICL7650 chopper-stabilized amplifier. The ICL7650 must use external 0.1F capacitors connected at pins 1 and 8. With the TC911, external offset voltage error canceling capacitors are not required. On the TC911 pins 1, 8 and 5 are not connected internally. The ICL7650 uses pin 5 as an optional output clamp connection. External chopper capacitors and clamp connections are not necessary with the TC911. External circuits connected to pins 1, 8 and 5 will have no effect. The TC911 can be quickly evaluated in existing ICL7650 designs. Since external capacitors are not required, system part count, assembly time, and total system cost are reduced. Reliability is increased and PC board layout eased by having the error storage capacitors integrated on the TC911 chip. The TC911 pinout matches many existing op-amps: 741, LM101, LM108, OP05-OP08, OP-20, OP-21, ICL7650 and ICL7652. In many applications operating from +5V supplies the TC911 offers superior electrical performance and can be a functional pin-compatible replacement. Offset voltage correction potentiometers, compensation capacitors, and chopper-stabilization capacitors can be removed when retrofitting existing equipment designs. (Seebeck voltage) can be measured. 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 TC911 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 thermo-electric coefficient solder can reduce errors. A 60% Sn/36% Pb solder has 1/10 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 1). Shielding precision analog circuits from air currents -- especially those caused by power dissipating components and fans -- will minimize temperature gradients and thermocouple-induced errors.
Avoiding Latch-Up
Junction-isolated CMOS circuits inherently contain a parasitic p-n-p-n transistor circuit. Voltages exceeding the supplies by 0.3V should not be applied to the device pins. Larger voltages can turn the p-n-p-n device on, causing excessive device power supply current and excessive power dissipation. TC911 power supplies should be established at the same time or before input signals are applied. If this is not possible input current should be limited to 0.1mA to avoid triggering the p-n-p-n structure.
Thermocouple Errors
Heating one joint of a loop made from two different metallic wires causes current flow. This is known as the Seebeck effect. By breaking the loop, an open circuit voltage
J3 = J4 J2 = J5 NO TEMPERATURE DIFFERENTIAL AND SAME METALLIC CONNECTION J1 = J6 J2 J1 J3
Overload Recovery
PACKAGE PIN
The TC911 recovers quickly from the output saturation. Typical recovery time from positive output saturation is 20msec. Negative output saturation recovery time is typically 5msec.
J4 J5 J2 V2
J6
+ - J3 V3 +
-
+
J1 V1
-
VT = V1 + V2 + V3 - V4 - V5 - V6 = 0 + J4 V 4 -
VT = 0
+
V5 - J5
+
V6 - J6
Figure 1. Unwanted Thermocouple Errors Eliminated by Reducing Thermal Gradients and Balancing Junctions 4
(c) 2001 Microchip Technology Inc. DS21481A
Monolithic Auto-Zeroed Operational Amplifers TC911A TC911B
TYPICAL APPLICATIONS 10-Volt Precision Reference
+9V TC911 REF02 ADJ R 2
Thermometer Circuit
18 k
+15V TC911 3+ 2 - 7 6 4 0.1 F 3.6 k VOUT = 10V
TEMP OUT
VREF
R 1
- + R3 VOUT
6.4V
6.4 k
V OUT = VTEMP 1 + R2 dV OUT dT K=1+
[(
R3 + R1 R3X R1
)] [
dT
R2 - VREF R1
]
=
[(
1 + R2 R2
R +R 3 1 R3X R1
)]
d (VTEMP )
K (2.1 mV/C)
R3X R 1
Programmable Gain Amplifier With Input Multiplexer
+5V -5V GND +5V -5V
IN1 IN2 IN3 IN4 IC1b IC1b
+ - +5V -5V
TC911
VOUT X1 X 10 18 k X 100 99 k X 1000 999 k
A1 A2 A3 A4 WR
INPUT CHANNEL SELECT
68HC11
GAIN SELECT
WR LATCH A1 A2 A3 A4
GND 2 k 1 k 1 k
IC1a, b, = Quad Analog Switch
(c) 2001 Microchip Technology Inc. DS21481A
5
Monolithic Auto-Zeroed Operational Amplifers TC911A TC911/B
PACKAGE DIMENSIONS
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)
8-Pin SOIC (Narrow)
PIN 1
.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.
Dimensions: inches (mm) 6
(c) 2001 Microchip Technology Inc. DS21481A
Monolithic Auto-Zeroed Operational Amplifers TC911A TC911B
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01/09/01
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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.
(c) 2001 Microchip Technology Inc.
DS21481A
7

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