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TC901CPA Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc |
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TC901CPA Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 4 page 3-261 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 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. Figure 7. Unwanted Thermocouple Errors Eliminated by Reducing Thermal Gradients and Balancing Junctions Larger voltages can turn the p-n-p-n device on, causing excessive device power supply current and excessive power dissipation. TC901's power supply should be established at the same time (or before) input signals are applied. If this is not possible, input current should be limited to 100 µA to avoid triggering the p-n-p-n structure. Pin Compatibility The CMOS TC901 is pin compatible with other chopper- stabilized amplifiers, such as the 7650, 7652 and 1052. Amplifiers such as the 7650 require 0.1 µF external capaci- tors connected to pins 1 and 8. The TC901 includes the chopper capacitors on-chip, so external capacitors are not required. Since pins 1, 5 and 8 of the TC901 are not connected, the TC901 can directly replace other chopper- stabilized amplifiers in existing circuits. The TC901 pinout also matches many popular bipolar and JFET op amps, such as the OP-07, OP-20, LM101, LM108, 356 and 741. In many applications that operate from ±15V power supplies, the TC901 offers superior electrical performance and is a functional pin-compatible replace- ment. Offset voltage correction potentiometers, compensa- tion capacitors, and chopper-stabilization capacitors can be removed when retrofitting existing equipment designs. System parts count, assembly time, and system cost are reduced, while reliability and performance are improved. Overload Recovery The TSC90X Series recovers quickly from output saturation. Typical recovery time from positive output satu- ration is 20 msec. Negative output saturation recovery time is typically 5 msec. Overload Recovery The TC901 recovers quickly from output saturation. Typical recovery time from positive output saturation is 20 msec. Negative output saturation recovery time is typically 5 msec. Thermocouple Errors Heating a junction made from two different metallic wires causes current flow. This is known as the Seebeck effect. An open-circuit voltage (Seebeck voltage) can be measured across the junction. Junction temperature and metal type determine the magnitude. Typical values are 0.1 µV/°C to 10µV/°C. Thermal-induced voltages can be many times larger than the TC901's offset voltage drift. Unless unwanted thermocouple potentials can be con- trolled, system performance will be less than optimum. Unwanted thermocouple junctions are created when leads are soldered or sockets/connectors are used. Low thermoelectric coefficient solder can reduce errors. A 60% Cd/40% Sn Pb solder has one-tenth 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 7). Shielding precision analog circuits from air currents — especially those caused by power dissipating components and fans — will minimize temperature gradients and mini- mize thermocouple-induced errors. J3 J4 J2 J1 J6 PACKAGE PIN J = J J = J J = J 3 2 1 4 5 6 NO TEMPERATURE DIFFERENTIAL AND SAME METALLIC CONNECTION + – – + +– +– +– +– V2 V1 V5 V6 V4 V3 J4 J3 J2 J1 J5 J5 J6 V = 0 T V = V + V + V – V – V – V = 0 T1 2 3 4 5 6 MONOLITHIC, AUTO-ZEROED OPERATIONAL AMPLIFIER TC901 |
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