TC911A TELCOM | Alldatasheet
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3-263TELCOM SEMICONDUCTOR, INC. AUTO-ZEROED OPERATIONAL AMPLIFIERS
FEATURES
n First Monolithic Chopper-Stabilized Amplifier With On-Chip Nulling Capacitors n High Open-Loop Voltage Gain n Low Input Voltage Noise n Pin Compatible With ICL7650 n 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 compensa- tion storage capacitors. External capacitors are not re- quired with the TC911. Just as easy to use as the conven- tional 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 exter- nal 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 de- signs. 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 off- set drift performance by eight times. The TC911 operates from dual or single power sup- plies. 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. PIN CONFIGURATION (SOIC and DIP) VDD VSS TC911 –INPUT +INPUT A A B *NOTE: Internal capacitors. No external capacitors required. MAIN AMPLIFIER LOW IMPEDANCE OUTPUT BUFFER INTERNAL OSCILLATOR (f 200 Hz)OSC ≈ V CORRECTION AMPLIFIEROS+ OUTPUT OUTPUT NC + INPUT TC911ACPA TC911BCPA – INPUT NC NC VSS VSS VDD VDD NC = NO INTERNAL CONNECTION OUTPUT NC + INPUT TC911ACOA TC911BCOA – INPUT NC NC
ORDERING INFORMATION
Part No. Package Range Voltage TC911ACOA 8-Pin SOIC 0 °C to +70°C1 5 µV TC911ACPA 8-Pin 0 °C to +70°C1 5 µV Plastic DIP TC911BCOA 8-Pin SOIC 0 °C to +70°C3 0 µV TC911BCPA 8-Pin 0 °C to +70°C3 0 µV Plastic DIP FUNCTIONAL BLOCK DIAGRAM TC911A TC911B
3-264 TELCOM SEMICONDUCTOR, INC. AUTO-ZEROED MONOLITHIC OPERATIONAL AMPLIFIERS TC911A TC911B ABSOLUTE MAXIMUM RATINGS* Operating Temperature Range Package Power Dissipation (TA = ≤ 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. TC911A TC911B Symbol Parameter Test Conditions Min Typ Max Min Typ Max Unit VOS Input Offset Voltage TA = +25°C — 5 15 — 15 30 µV TCV OS Average Temperature 0 °C ≤ TA ≤ +70°C — 0.05 0.15 — 0.1 0.25 µV/°C Coefficient of Input –25°C ≤ TA ≤ +85°C — 0.05 0.15 — 0.1 0.25 µV/°C Offset Voltage (Note 1) IB Average Input Bias T A = +25°C — — 70 — — 120 pA Current 0 °C ≤ TA ≤ +70°C— — 3 — — 4 n A IOS Average Input T A = +25°C — 5 20 — 10 40 pA Offset Current T A = +85°C— — 1 — — 1 n A eN Input Voltage Noise 0. 1 to 1 Hz, RS ≤ 100Ω — 0.65 — — 0.65 — µVP-P 0. 1 to 10 Hz, RS ≤ 100Ω —1 1— — 1 1— µVP-P CMRR Common-Mode V SS ≤ VCM ≤ VDD – 2.2 110 116 — 105 110 — dB Rejection Ratio CMVR Common-Mode V SS —V DD – 2 V SS —V DD – 2 V Voltage Range AOL Open-Loop Voltage R L = 10 kΩ , VOUT = ±4V 115 120 — 110 120 — dB Gain VOUT Output Voltage Swing RL = 10 kΩ VSS + 0.3 — V DD – 0.9 VSS + 0.3 — V DD – 0.9 V BW Closed Loop Closed Loop Gain = + 1 — 1.5 — — 1.5 — MHz Bandwidth SR Slew Rate R L = 10 kΩ , CL = 50 pF — 2.5 — — 2.5 — V/ µs PSRR Power Supply ±3.3V to ±5.5V 112 — — 105 — — dB Rejection Ratio VS Operating Supply Split Supply ±3.3 — ±8 ±3.3 — ±8V Voltage Range Single Supply 6.5 — 16 6.5 — 16 V IS Quiescent Supply V S = ±5V — 350 600 — — 800 µA Current NOTES: 1. Characterized; not 100% tested.
3-265TELCOM SEMICONDUCTOR, INC. AUTO-ZEROED MONOLITHIC OPERATIONAL AMPLIFIERS TC911A TC911B TYPICAL CHARACTERISTICS 450SUPPLY CURRENT ( µA) –100 AMBIENT TEMPERATURE ( °C) 400 350 300 250 200 –50 0 50 100 150 Supply Current vs. Temperature VS = –5V HORIZONTAL SCALE = 2 µs/DIV Large Signal Output Switching Waveform R L = 10 kΩ TA = +25°C INPUT VERTICAL SCALE = 2 V/DIV OUTPUT VERTICAL SCALE = 1 V/DIV 35INPUT OFFSET VOLTAGE ( µV) INPUT COMMON-MODE VOLTAGE (V) Input Offset Voltage vs. Common-Mode Voltage – 5 – 4 – 3 – 2 – 1 01234 VS = –5V TA = +25°C 700 600 500 400 300 200 100 SUPPLY CURRENT ( µA) 2345678 – SUPPLY VOLTAGE (V) TA = +25°C Supply Current vs. – Supply Voltage 50CLOSED-LOOP GAIN (dB) 10k FREQUENCY (Hz) Gain and Phase vs. Frequency –10 –20 –30 –40 100k 1M 10M PHASE GAIN VS = –5V TA = +25°C R L = 10 kΩ 225 PHASE (deg) 180 135 –45 –90 –135 –180 – OUTPUT VOLTAGE (V) 100 LOAD RESISTANCE ( Ω ) Output Voltage Swing vs. Load Resistance
5.0 VS = –5V
TA = +25°C –SWING +SWING4.2 3.4 2.6 1.8 1.0 1k 10k 100k 5.8
3-266 TELCOM SEMICONDUCTOR, INC.
- With the TC911, external offset voltage error cancel-
when retrofitting existing equipment designs. tem performance will be less than optimum. 64% Sn/36% Pb solder at a copper junction. zero-canceling errors (Figure 1). supplies by 0.3V should not be applied to the device pins. triggering the p-n-p-n structure. The TC911 recovers quickly from the output saturation. Figure 1. Unwanted Thermocouple Errors Eliminated by
3-267TELCOM SEMICONDUCTOR, INC. AUTO-ZEROED MONOLITHIC OPERATIONAL AMPLIFIERS TC911A TC911B TYPICAL APPLICATIONS Thermometer Circuit10-Volt Precision Reference TC911 18 kΩ 6.4 kΩ 3.6 kΩ 6.4V 0.1 µF +15V V = 10VOUT +9V TC911 REF02 VOUT ADJ TEMP OUT VREF V = VOUT 1 + R2[ ( ) VREF–][ 1 + R2[ R + R 1( )] d (V )d VOUT = ≈K (2.1 mV/°C) K = 1 + R 2 dT R X R TEMP TEMP3 3 dT R + R13 1R X R3 1R X R3 Programmable Gain Amplifier With Input Multiplexer IN1 TC911 IN2 IN3 A1 A 2 A 3 A 4WR +5V –5V GND +5V –5V +5V –5V 1 VOUT 2 kΩ 18 kΩ INPUT CHANNEL SELECT 68HC11 GAIN SELECT A 1 A 2 A 3 A 4 WR LATCH GND 10X 100 1000XX X 99 kΩ 999 kΩ 1 kΩ 1 kΩ IN4 IC1b IC1b IC1a, b, = Quad Analog Switch