TC911A TC911B Monolithic Auto-Zeroed Operational Amplifers FEATURES 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 15µV maximum offset voltage, 0.15µV/°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 350µA. 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. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ First Monolithic Chopper-Stabilized Amplifier With On-Chip Nulling Capacitors Offset Voltage .................................................... 5µV Offset Voltage Drift .................................. 0.05µV/°C Low Supply Current ...................................... 350µA High Common-Mode Rejection .................... 116dB Single Supply Operation ....................... 4.5V to 16V High Slew Rate ......................................... 2.5V/µsec Wide Bandwidth ............................................ 1.5MHz High Open-Loop Voltage Gain (RL = 10kΩ) ..................................................... 120dB Low Input Voltage Noise (0.1Hz to 1Hz) ............................................ 0.65µVP-P Pin Compatible With ICL7650 Lower System Parts Count ORDERING INFORMATION Part No. Package TC911ACOA TC911ACPA 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP TC911BCOA TC911BCPA Maximum Offset Voltage Temperature Range 0°C to +70°C 0°C to +70°C 15µV 15µV 0°C to +70°C 0°C to +70°C 30µV 30µV PIN CONFIGURATION (SOIC and DIP) + INPUT 3 VSS 4 TC911ACPA TC911BCPA 6 OUTPUT + INPUT 3 VSS 4 8 NC 7 VDD TC911ACOA TC911BCOA 6 OUTPUT 5 NC VSS 4 2 7 + V CORRECTION AMPLIFIER OS A INTERNAL OSCILLATOR (fOSC ≈ 200 Hz) – B * B * A 3 – INPUT 2 NC = NO INTERNAL CONNECTION VDD +INPUT 7 VDD 5 NC FUNCTIONAL BLOCK DIAGRAM –INPUT NC 1 8 NC NC 1 – INPUT 2 TC911 + + – MAIN AMPLIFIER LOW IMPEDANCE OUTPUT BUFFER 6 OUTPUT – *NOTE: Internal capacitors. No external capacitors required. © 2001 Microchip Technology Inc. DS21481A TC911/A/B-7 9/11/96 Monolithic Auto-Zeroed Operational Amplifers TC911A TC911/B Package Power Dissipation (TA ≤ 70°C) Plastic DIP ...................................................... 730mW Plastic SOIC ................................................... 470mW 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 ............................................... 100µA Storage Temperature Range ................ – 65°C to +150°C Lead Temperature (Soldering, 10 sec) ................. +300°C Operating Temperature Range C Device ................................................ 0°C to +70°C *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 = +25°C, unless otherwise indicated. Min TC911A Typ Max Min TC911B Typ Max Unit — — — 5 0.05 0.05 15 0.15 0.15 — — — 15 0.1 0.1 30 0.25 0.25 µV µV/°C µV/°C — — — — — — — 110 — — — 5 — 0.65 11 116 70 3 4 20 1 — — — — — — — — — — 105 — — — 10 — 0.65 11 110 120 4 6 40 1 — — — pA nA nA pA nA µVP-P µVP-P dB VSS — VDD – 2 VSS — VDD –2 V 115 120 — 110 120 — dB RL = 10 kΩ VSS + 0.3 Closed Loop Gain = +1 — — 1.5 VDD – 0.9 — VSS + 0.3 — — 1.5 VDD – 0.9 — V MHz RL = 10 kΩ, CL = 50pF ±3.3V to ±5.5V — 112 2.5 — — — — 105 2.5 — — — V/µsec dB Split Supply Single Supply VS = ±5V ±3.3 6.5 — — — 350 ±8 16 600 ±3.3 6.5 — — — — ±8 16 800 V V µA Symbol Parameter Test Conditions VOS TCVOS TA = +25°C 0°C ≤ TA ≤ +70°C –25°C ≤ TA ≤ +85°C (Note 1) TA = +25°C 0°C ≤ TA ≤ +70°C –25°C ≤ TA ≤ +85°C TA = +25°C TA = +85°C 0.1 to 1 Hz, RS ≤ 100Ω 0.1 to 10 Hz, RS ≤ 100Ω VSS ≤ VCM ≤ VDD – 2.2 IB IOS eN CMRR CMVR AOL VOUT BW SR PSRR VS IS 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 RL = 10 kΩ, VOUT = ±4V NOTES: 1. Characterized; not 100% tested. 2 © 2001 Microchip Technology Inc. DS21481A Monolithic Auto-Zeroed Operational Amplifers TC911A TC911B TYPICAL CHARACTERISTICS Supply Current vs. ± Supply Voltage 450 TA = +25°C 35 VS = ±5V VS = ±5V 500 400 300 200 INPUT OFFSET VOLTAGE (µV) SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 600 400 350 300 250 100 200 –100 0 2 3 4 5 6 7 ± SUPPLY VOLTAGE (V) 8 PHASE 30 20 GAIN 180 135 90 10 45 0 0 –10 –45 –20 –90 –30 –135 –40 10k 100k 1M FREQUENCY (Hz) © 2001 Microchip Technology Inc. DS21481A 25 20 15 10 5 –6 –5 –4 –3 –2 –1 0 1 2 3 4 INPUT COMMON-MODE VOLTAGE (V) 150 Output Voltage Swing vs. Load Resistance 5.8 225 PHASE (deg) CLOSED-LOOP GAIN (dB) 40 VS = ±5V TA = +25°C RL = 10 kΩ TA = +25°C Large Signal Output Switching Waveform Gain and Phase vs. Frequency 50 30 0 –50 0 50 100 AMBIENT TEMPERATURE (°C) INPUT VERTICAL SCALE = 2 V/DIV RL = 10 kΩ TA = +25°C OUTPUT VERTICAL SCALE = 1 V/DIV 0V –180 10M 5.0 ± OUTPUT VOLTAGE (V) 700 Input Offset Voltage vs. Common-Mode Voltage Supply Current vs. Temperature TA = +25°C VS = ±5V 4.2 3 +SWING 3.4 2.6 1.8 1.0 100 HORIZONTAL SCALE = 2 µs/DIV –SWING 1k 10k 100k LOAD RESISTANCE (Ω) 1M Monolithic Auto-Zeroed Operational Amplifers TC911A TC911/B Pin Compatibility (Seebeck voltage) can be measured. Junction temperature and metal type determine the magnitude. Typical values are 0.1µV/°C to 10µV/°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. The CMOS TC911 is pin compatible with the industry standard ICL7650 chopper-stabilized amplifier. The ICL7650 must use external 0.1µF 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. 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 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. PACKAGE PIN J6 J4 J5 + – J2 V2 – + J1 V1 – J3 V3 + VT = V1 + V2 + V3 – V4 – V5 – V6 = 0 + J4 V4 – + V5 – J5 + VT = 0 V6 – J6 Figure 1. Unwanted Thermocouple Errors Eliminated by Reducing Thermal Gradients and Balancing Junctions 4 © 2001 Microchip Technology Inc. DS21481A Monolithic Auto-Zeroed Operational Amplifers TC911A TC911B TYPICAL APPLICATIONS Thermometer Circuit 10-Volt Precision Reference +9V 18 kΩ TC911 TEMP OUT +15V REF02 TC911 3 + 2 – R 2 ADJ 7 6 VOUT = 10V VREF R 1 4 – 0.1 µF 6.4V VOUT + 3.6 kΩ R3 6.4 kΩ R3 + R1 R3X R1 [ ( VOUT = VTEMP 1 + R2 d VOUT dT K=1+ = [ ( 1 + R2 R +R 3 1 R3X R1 R2 – VREF R1 )] [ d (VTEMP ) )] dT ] ≈ K (2.1 mV/°C) R2 R3X R 1 Programmable Gain Amplifier With Input Multiplexer +5V –5V GND +5V –5V IN1 TC911 + IN2 IC1b IN3 IN4 VOUT – IC1b A1 A2 A3 A4 WR +5V –5V X1 X 10 X 100 X 1000 18 k Ω 99 k Ω 999 kΩ 2 kΩ 1 kΩ 1 kΩ INPUT CHANNEL SELECT GAIN SELECT 68HC11 WR LATCH A1 A2 A3 A4 IC1a, b, = Quad Analog Switch © 2001 Microchip Technology Inc. DS21481A 5 GND Monolithic Auto-Zeroed Operational Amplifers TC911A TC911/B PACKAGE DIMENSIONS PIN 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .070 (1.78) .040 (1.02) .310 (7.87) .290 (7.37) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .015 (0.38) .008 (0.20) 3° MIN. .400 (10.16) .310 (7.87) .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) .010 (0.25) .007 (0.18) 8° MAX. .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .050 (1.27) .016 (0.40) Dimensions: inches (mm) 6 © 2001 Microchip Technology Inc. DS21481A Monolithic Auto-Zeroed Operational Amplifers TC911A TC911B WORLDWIDE SALES AND SERVICE AMERICAS New York Corporate Office 150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 ASIA/PACIFIC (continued) San Jose Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-334-8870 Fax: 65-334-8850 Taiwan Atlanta 6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307 Microchip Technology Taiwan 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139 ASIA/PACIFIC Austin EUROPE China - Beijing Australia Analog Product Sales 8303 MoPac Expressway North Suite A-201 Austin, TX 78759 Tel: 512-345-2030 Fax: 512-345-6085 Boston 2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821 Boston Analog Product Sales Unit A-8-1 Millbrook Tarry Condominium 97 Lowell Road Concord, MA 01742 Tel: 978-371-6400 Fax: 978-371-0050 Toronto Microchip Technology Beijing Office Unit 915 New China Hong Kong Manhattan Bldg. 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