Obsolete Device TC911A/TC911B Monolithic Auto-Zeroed Operational Amplifiers Features Package Type • First Monolithic Chopper-Stabilized Amplifier with On-Chip Nulling Capacitors • Low Offset Voltage: 5μV • Low 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: 120dB • Low Input Noise Voltage: 0.65μVP-P (0.1Hz to 1Hz) • Pin Compatible With ICL7650 • Lower System Parts Count 8-Pin PDIP 8 NC NC 1 - Input 2 TC911ACPA TC911BCPA 7 VDD 6 Output + Input 3 VSS 4 5 NC 8-Pin SOIC NC 1 - Input 2 + Input 3 VSS 4 TC911ACOA TC911BCOA 8 NC 7 VDD 6 Output 5 NC Applications • • • • • NC = No Internal Connection Instrumentation Portable/Battery Powered Embedded Control Temperature Sensor Amplifier Strain Gage Amplifier Device Selection Table Part Number Package Temperature Offset Range Voltage TC911ACOA 8-Pin SOIC 0°C to +70°C 15μV TC911ACPA 8-Pin PDIP 15μV 0°C to +70°C TC911BCOA 8-Pin SOIC 0°C to +70°C 30μV TC911BCPA 8-Pin PDIP 30μV 0°C to +70°C © 2005 Microchip Technology Inc. DS21481C-page 1 TC911A/TC911B General Description ability, reduced PC board layout effort and greater board area utilization. Space savings can be significant in multiple amplifier designs. 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. Electrical specifications include 15μV maximum offset voltage and 0.15μV/°C maximum offset voltage temperature co-efficient. 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. Several system benefits arise by eliminating the external chopper capacitors: lower system parts count, reduced assembly time and cost, greater system reli- Functional Block Diagram VSS VDD 4 -Input 2 7 + VOS Correction Amplifier – Internal Oscillator (FOSC 200HZ) A B * B * A +Input 3 + + – Main Amplifier Low Impedance Output Buffer 6 Output – TC911A TC911B Note: Internal capacitors. No external capacitors required. DS21481C-page 2 © 2005 Microchip Technology Inc. TC911A/TC911B 1.0 ELECTRICAL CHARACTERISTICS *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 operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. 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 Package Power Dissipation (TA - 70°C) Plastic DIP............................................. 730mW Plastic SOIC .......................................... 470mW Operating Temperature Range C Device....................................... 0°C to +70°C Storage Temperature Range.............. -65°C to +150°C TC911A AND TC911B ELECTRICAL SPECIFICATIONS Electrical Characteristics: VS = ±5V, TA = +25°C, unless otherwise indicated. TC911A Symbol Parameter TC911B Min Typ Max Min Typ Max Unit μV Test Conditions VOS Input Offset Voltage — 5 15 — 15 30 TCVOS Average Temp. Coefficient of Input Offset Voltage — — 0.05 0.05 0.15 0.15 — — 0.1 0.1 0.25 0.25 IB Average Input Bias Current — — — — — — 70 3 4 — — — — — — 120 4 6 pA nA nA TA = +25°C 0°C ≤ TA ≤ +70°C -25°C ≤ TA ≤ +85° IOS Average Input Offset Current — — 5 — 20 1 — — 10 — 40 1 pA nA TA = +25°C TA = +85°C eN Input Voltage Noise — — 0.65 11 — — — — 0.65 11 — — μVP-P μVP-P 0.1 to 1Hz, RS ≤ 100Ω 0.1 to 10Hz, RS ≤ 100Ω CMRR Common Mode Rejection Ratio 110 116 — 105 110 — dB VSS ≤ VCM ≤ VDD - 2.2 CMVR Common Mode Voltage Range VSS — VDD – 2 VSS — VDD – 2 V AOL Open-Loop Voltage Gain 115 120 — 110 120 — dB RL = 10kΩ, VOUT = ±4V VOUT Output Voltage Swing VSS + 0.3 — VDD – 0.9 VSS + 0.3 — VDD – 0.9 V RL = 10kΩ BW Closed Loop Bandwidth — 1.5 — — 1.5 — MHz SR Slew Rate — 2.5 — — 2.5 — PSRR Power Supply Rejection Ratio 112 — — 105 — — dB ±3.3V to ±5.5V VS Operating Supply Voltage Range ±3.3 6.5 — — ±8 16 ±3.3 6.5 — — ±8 16 V V Split Supply Single Supply IS Quiescent Supply Current — 350 600 — — 800 μA VS = ±5V Note 1: Characterized; not 100% tested. © 2005 Microchip Technology Inc. TA = +25°C μV/°C 0°C ≤ TA ≤ +70°C μV/°C -25°C ≤ TA ≤ +85°C (Note 1) Closed Loop Gain = +1 V/μsec RL = 10kΩ, CL = 50pF DS21481C-page 3 TC911A/TC911B 2.0 PIN DESCRIPTIONS performance and can be a functional pin compatible replacement. Offset voltage correction potentiometers, compensation capacitors, and chopper stabilization capacitors can be removed when retro-fitting existing equipment designs. The descriptions of the pins are listed in <Blue References>Table 2-1. TABLE 2-1: PIN FUNCTION TABLE 3.2 Pin Number Symbol 1, 5, 8 NC 2 -INPUT 3 +INPUT 4 VSS 6 OUTPUT 7 VDD Description 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 (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. No Internal Connection. Inverting Input Non-inverting Input Negative Power Supply Output Positive Power Supply 3.0 DETAILED DESCRIPTION 3.1 Pin Compatibility Thermocouple Errors 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 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 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 3-1). 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 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 FIGURE 3-1: UNWANTED THERMOCOUPLE ERRORS ELIMINATED BY REDUCING THERMAL GRADIENTS AND BALANCING JUNCTIONS J 3 = J4 J2 = J5 No Temperature Differential and same J1 = J6 Metallic Connection J2 J1 J3 J2 Package – Pin J3 V3 + + V2 J1 – + V1 – VT = V1 + V2 + V3 – V4 – V5 – V6 = 0 J6 J4 J5 DS21481C-page 4 + J4 V4 – + V5 J5 – + V6 VT = 0 – J6 © 2005 Microchip Technology Inc. TC911A/TC911B 3.3 Avoiding Latchup 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. 3.4 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. © 2005 Microchip Technology Inc. DS21481C-page 5 TC911A/TC911B 4.0 TYPICAL APPLICATIONS FIGURE 4-1: FIGURE 4-2: THERMOMETER CIRCUIT 10-VOLT PRECISION REFERENCE +9V TC911 Temp Out REF02 +15V 18 k TC911 R2 ADJ 3 + 2 – VREF R1 – 6 VOUT = 10V 4 0.1µF 6.4V VOUT + 7 3.6 k R3 6.4 k [ VOUT = VTEMP 1 + R2 d VOUT [ ≈ dT K=1+ 1 + R2 ( ( R 3 + R1 R3 X R1 R3 + R1 R3 X R1 )] )] [ – VREF d (VTEMP) dT R2 R1 ] ≈ K (2.1 mV/C) R2 R3 X R1 FIGURE 4-3: PROGRAMMABLE GAIN AMPLIFIER WITH INPUT MULTIPLEXER +5V –5V GND +5V –5V TC911 IN1 + IN2 VOUT IC1b IN3 IN4 – IC1b A1 A2 A3 A4 WR +5V -5V X1 X 10 X 100 X 1000 18k 99k 999k 2k 1k 1k Input Channel Select Gain Select 68HC11 WR A1 Latch A2 A3 GND A4 IC1a, b, = Quad Analog Switch DS21481C-page 6 © 2005 Microchip Technology Inc. TC911A/TC911B 5.0 TYPICAL CHARACTERISTICS Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 700 Input Offset Voltage vs. Common-Mode Voltage Supply Current vs. Temperature Supply Current vs. ± Supply Voltage 450 TA = +25˚C 35 VS = ±5V VS = ±5V 30 600 500 400 300 200 Input Offset Voltage (µV) Supply Current (µA) Supply Current (µA) 400 350 300 250 100 25 20 15 10 5 200 -100 0 3 4 5 6 ± Supply Voltage (V) 7 8 PHASE 30 20 VS = ±5V TA = +25˚C RL = 10kΩ GAIN 5.8 RL = 10k T = +25˚C Input Vertical Scale = 2 V/DIV A 135 90 10 45 0 0 4 Output Voltage Swing vs. Load Resistance 225 180 PHASE (deg) 40 -6 -5 -4 -3 -2 -1 0 1 2 3 Input Common Mode Voltage (V) 150 Large Signal Output Switching Waveform Gain and Phase vs. Frequency 50 0 -50 0 50 100 Ambient Temperature (˚C) -10 -45 -20 -90 -30 -135 Output Vertical Scale = 1 V/DIV 0V 5.0 ± Output Voltage (V) 2 Closed Loop Gain (dB) TA = +25˚C TA = +25˚C VS = ±5V –Swing 4.2 +Swing 3.4 2.6 1.8 -40 10k 100k 1M Frequency (Hz) © 2005 Microchip Technology Inc. -180 10M 1.0 100 Horizontal Scale = 2µs/DIV 1k 10k 100k 1M Load Resistance (Ω) DS21481C-page 7 TC911A/TC911B 6.0 PACKAGING INFORMATION 6.1 Package Marking Information Package marking data not available at this time. 6.2 Taping Form Component Taping Orientation for 8-Pin SOIC (Narrow) Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package 8-Pin SOIC (N) DS21481C-page 8 Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 12 mm 8 mm 2500 13 in © 2005 Microchip Technology Inc. TC911A/TC911B 6.3 Package Dimensions 8-Pin SOIC 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) 8-Pin Plastic DIP 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) .022 (0.56) .015 (0.38) .015 (0.38) .008 (0.20) 3° MIN. .400 (10.16) .310 (7.87) Dimensions: inches (mm) Dimensions: inches (mm) © 2005 Microchip Technology Inc. DS21481C-page 9 TC911A/TC911B NOTES: DS21481C-page 10 © 2005 Microchip Technology Inc. TC911A/911B SALES AND SUPPORT Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products. © 2005 Microchip Technology Inc. DS21481C-page 11 TC911A/911B NOTES: DS21481C-page 12 © 2005 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. 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Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance and WiperLock are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2005, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona and Mountain View, California in October 2003. 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