TC913ACOA

TC913A TELCOM | Alldatasheet

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3-269TELCOM SEMICONDUCTOR, INC. DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS

FEATURES

n First Monolithic Dual Auto-Zeroed Operational Amplifier n Chopper Amplifier Performance Without External Capacitors — Saves Cost/Assembly of Four "Chopper" Capacitors n SOIC Packages Available n Low Input Voltage Noise n Wide Common-Mode +6.5V to +16V n Excellent AC Operating Characteristics n Pin Compatible With LM358, OP-14, MC1458, ICL7621, TL082, TLC322 GENERAL DESCRIPTION The TC913 is the world's first complete monolithic, dual auto-zeroed operational amplifier. The TC913 sets a new standard for low-power, precision dual-operational amplifiers. Chopper-stabilized or auto-zeroed amplifiers offer low offset voltage errors by periodically sampling offset error, and storing correction voltages on capacitors. Previous single amplifier designs required two user-sup- plied, external 0.1µF error storage correction capacitors — much too large for on-chip integration. The unique TC913 architecture requires smaller capacitors, making on-chip integration possible. Microvolt offset levels are achieved and external capacitors are not required. The TC913 system benefits are apparent when con- trasted with a TC7650 chopper amplifier circuit implemen- tation. A single TC913 replaces two TC7650's and four capacitors. Five components and assembly steps are elimi- nated. The TC913 pinout matches many popular dual- operational amplifiers: OP-04, TLC322, LM358, and ICL7621 are typical examples. In many applications, operating from dual 5V power supplies or single supplies, the TC913 offers superior electrical performance, and can be a functional drop-in replacement; printed circuit board rework is not necessary. The TC913's low offset voltage error eliminates offset voltage trim potentiometers often needed with bipolar and low-accuracy CMOS operational amplifiers. The TC913 takes full advantage of TelCom's propri- etary CMOS technology. Unity gain bandwidth is 1.5 MHz and slew rate is 2.5 V/µsec. VDDVSS TC913 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 –INPUT A –INPUT B

1 OF 2 AMPLIFIERS SHOWN

–INPUT A –INPUT B 3 OUTPUT B7 FUNCTIONAL BLOCK DIAGRAM

ORDERING INFORMATION

Temp. Offset Part No. Package Range Voltage TC913ACOA 8-Pin SOIC 0 °C to +70°C1 5 µV TC913ACPA 8-Pin Plastic DIP 0 °C to +70°C1 5 µV TC913BCOA 8-Pin SOIC 0 °C to +70°C3 0 µV TC913BCPA 8-Pin Plastic DIP 0 °C to +70°C3 0 µV PIN CONFIGURATION (SOIC and DIP) –IN B 8OUT A –IN A +IN A V SS V SS V DD V DD +IN B TC913ACPA TC913BCPA TC913ACOA TC913BCOA OUT B+– A B –IN B 8OUT A –IN A +IN A +IN B OUT B+– A B TC913A/B-8 9/3/96 TC913A TC913B

3-270 TELCOM SEMICONDUCTOR, INC. DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS TC913A TC913B 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. TC913A TC913B 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 TA = +25°C — — 90 — — 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 — 0.6 — — 0.6 — µVP-P 0. 1 to 10 Hz, RS ≤ 100Ω —1 1— — 1 1— µVP-P CMRR Common-Mode V SS ≤ VCM ≤ VDD – 2.2V 110 116 — 100 110 — 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 , VO = ±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 ≤ VS ≤ ±5.5V 110 — — 100 — — dB Rejection Ratio VS Operating Supply Split Supply ±3.3 — ±8.3 ±3.3 — ±8.3 V Voltage Range Single Supply 6.5 — 16 6.5 — 16 V IS Quiescent Supply V S = ±5V — 0.65 0.85 — — 1.1 mA Current NOTE: 1. Characterized; not 100% tested.

3-271TELCOM SEMICONDUCTOR, INC. DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS TC913A TC913B Theory of Operation Each of the TC913's two op-amps actually consists of two amplifiers. A main amplifier is always connected from the input to the output. A separate nulling amplifier alter- nately nulls its own offset and then the offset of the amplifier. Since each amplifier is continuously being nulled, offset voltage drift with time, temperature, and power supply variations is greatly reduced. All nulling circuitry is internal and the nulling operation is transparent to the user. Offset nulling voltages are stored on two internal capacitors. An internal oscillator and control logic, shared by the TC913's two amplifiers, control the nulling process. Pin Compatibility The TC913 pinout is compatible with OP-14, LM358, MC1458, LT1013, TLC322, and similar dual op amps. In many circuits operating from single or ±5V supplies, the TC913 is a drop-in replacement offering DC performance rivaling that of the best single op amps. The TC913's amplifiers include a low-impedance class AB output buffer. Some previous CMOS chopper amplifiers used a high-impedance output stage which made open-loop gain dependent on load resistance. The TC913's open-loop gain is not dependent on load resistance. Overload Recovery The TC913 recovers quickly from output saturation. Typical recovery time from positive output saturation is 20msec. Negative output saturation recovery time is typi- cally 5msec. 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 power dissipa- tion. The TC913's 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.

3-272 TELCOM SEMICONDUCTOR, INC. HORIZONTAL SCALE = 20 msec/DIV Positive Overload Recovery Time OUTPUT =

2 V/DIV

GAIN = –20 35INPUT OFFSET VOLTAGE ( µV) INPUT COMMON-MODE VOLTAGE (V) Input Offset Voltage vs. Common-Mode Voltage – 5 – 4 – 3 – 2 – 1 01234 V = –5V T = +25°C S A SUPPLY CURRENT ( µA) – SUPPLY VOLTAGE (V) Supply Current vs. – Supply Voltage HORIZONTAL SCALE = 20 msec/DIV Negative Overload Recovery Time R = 10 k T = +25°C Ω INPUT 0V L A OUTPUT = 2 V/DIV CLOSED-LOOP GAIN (dB) 10k FREQUENCY (Hz) Gain and Phase vs. Frequency –10 –20 –30 –40 100k 1M 10M PHASE GAIN V = –5V T = +25°C R = 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 V = –5V

T = +25°C –SWING +SWING4.2 3.4 2.6 1.8 1.0 1k 10k 100k A S S A L 1200 1000 800 600 400 200 23 5 46 7 8 T = +25°CA GAIN = –20 TYPICAL CHARACTERISTICS TC913A TC913B DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS