TC913BCOA

1 TC913A TC913B DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS FEATURES s s First Monolithic Dual Auto-Zeroed Operational Amplifier Chopper Amplifier Performance Without External Capacitors — VOS ........................................................ 15µV Max — VOS Drift ....................................... 0.15µV/°C Max — Saves Cost/Assembly of Four "Chopper" Capacitors SOIC Packages Available High DC Gain ................................................. 120dB Low Supply Current ...................................... 650µA Low Input Voltage Noise (0.1 Hz to 10 Hz) ........................................ 0.65µVP-P Wide Common-Mode Voltage Range ................................. VSS to VDD – 2V High Common-Mode Rejection .................... 116dB Dual or Single Supply Operation .... ±3.3V to ±8.3V +6.5V to +16V Excellent AC Operating Characteristics — Slew Rate ............................................. 2.5V/µsec — Unity-Gain Bandwidth ............................. 1.5MHz 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-supplied, 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 contrasted with a TC7650 chopper amplifier circuit implementation. A single TC913 replaces two TC7650's and four capacitors. Five components and assembly steps are eliminated. The TC913 pinout matches many popular dualoperational 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 proprietary CMOS technology. Unity gain bandwidth is 1.5 MHz and slew rate is 2.5 V/µsec. 2 3 4 5 6 7 1 7 OUTPUT A OUTPUT B s s s s s s s s s ORDERING INFORMATION Temp. Range 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C Part No. TC913ACOA TC913ACPA TC913BCOA TC913BCPA Package 8-Pin SOIC 8-Pin Plastic DIP 8-Pin SOIC 8-Pin Plastic DIP Maximum Offset Voltage 15µV 15µV 30µV 30µV FUNCTIONAL BLOCK DIAGRAM VSS VDD 8 4 PIN CONFIGURATION (SOIC and DIP) VOS CORRECTION AMPLIFIER + A A – * B B INTERNAL OSCILLATOR (f OSC ≈ 200 Hz) OUT A 1 –IN A 2 +IN A 3 V SS 4 A +– 5 +IN B V SS 4 TC913ACPA TC913BCPA TC913ACOA TC913BCOA TELCOM SEMICONDUCTOR, INC. – + 6 –IN B +IN A 3 +– B – + 8 V DD 7 OUT B OUT A 1 –IN A 2 A 8 V DD B 7 OUT B 6 –IN B 5 +IN B –INPUT A –INPUT B –INPUT A –INPUT B 2 6 5 3 * – + MAIN AMPLIFIER 1 OF 2 AMPLIFIERS SHOWN – LOW IMPEDANCE OUTPUT BUFFER + TC913 *NOTE: Internal capacitors. No external capacitors required. 8 TC913A/B-8 9/3/96 3-269 DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS TC913A TC913B 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 Package Power Dissipation (TA = ≤ 70°C) Plastic SOIC ................................................... 470mW Plastic DIP ......................................................730mW *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. 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 = +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 – 2.2V Min — — — — — — — — — — 110 VSS TC913A Typ 5 0.05 0.05 — — — 5 — 0.6 11 116 — 120 — 1.5 2.5 — — — 0.65 Max 15 0.15 0.15 90 3 4 20 1 — — — VDD – 2 — VDD – 0.9 — — — ±8.3 16 0.85 Min — — — — — — — — — — 100 VSS 110 VSS + 0 .3 — — 100 ±3.3 6.5 — TC913B Typ 15 0.1 0.1 — — — 10 — 0.6 11 110 — 120 — 1.5 2.5 — — — — Max 30 0.25 0.25 120 4 6 40 1 — — — VDD – 2 — VDD – 0.9 — — — ±8.3 16 1.1 Unit µV µV/°C µV/°C pA nA nA pA nA µVP-P µVP-P dB V dB V MHz V/µs dB V V mA IB IOS eN CMRR CMVR AOL VOUT BW SR PSRR VS IS NOTE: RL = 10 kΩ, VO = ±4V RL = 10 kΩ Closed Loop Gain = +1 RL = 10 kΩ, CL = 50 pF ±3.3V ≤ VS ≤ ±5.5V Split Supply Single Supply VS = ±5V 115 VSS + 0 .3 — — 110 ±3.3 6.5 — 1. Characterized; not 100% tested. 3-270 TELCOM 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 alternately 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. 1 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 dissipation. 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. 2 3 4 5 6 7 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 typically 5msec. 8 TELCOM SEMICONDUCTOR, INC. 3-271 DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS TC913A TC913B TYPICAL CHARACTERISTICS Supply Current vs. ± Supply Voltage 1200 1000 800 600 400 200 0 2 3 4 5 6 ± SUPPLY VOLTAGE (V) 7 8 Input Offset Voltage vs. Common-Mode Voltage 35 Gain and Phase vs. Frequency 50 40 CLOSED-LOOP GAIN (dB) 30 20 10 0 –10 –20 –30 GAIN PHASE VS = ±5V TA = +25°C RL = 10 kΩ 225 180 135 90 45 0 –45 –90 –135 100k 1M FREQUENCY (Hz) –180 10M PHASE (deg) TA = +25°C INPUT OFFSET VOLTAGE (µV) SUPPLY CURRENT (µA) 30 25 20 15 10 5 0 VS = ±5V TA = +25°C –6 –5 –4 –3 –2 –1 0 1 2 3 4 INPUT COMMON-MODE VOLTAGE (V) –40 10k Output Voltage Swing vs. Load Resistance TA = +25°C VS = ±5V –SWING Negative Overload Recovery Time RL = 10 kΩ TA = +25°C Positive Overload Recovery Time ± OUTPUT VOLTAGE (V) 5.0 4.2 3.4 2.6 1.8 OUTPUT = 2 V/DIV INPUT +SWING 0V 0V OUTPUT = 2 V/DIV GAIN = –20 INPUT GAIN = –20 INPUT 1.0 100 1k 10k 100k LOAD RESISTANCE (Ω) 1M HORIZONTAL SCALE = 20 msec/DIV HORIZONTAL SCALE = 20 msec/DIV 3-272 TELCOM SEMICONDUCTOR, INC.