NTE938 & NTE938M Integrated Circuit Precision Operational Amplifier (OP Amp) Description: The NTE938 and NTE938M operational amplifiers provide high input impedance, low input offsets and temperature drifts, and low noise. This series of amplifiers is particularly useful for applications where high–accuracy and low–drift performance are essential. In addition, high–speed performance may be improved by employing feed–forward compensation techniques to maximize slew rate without compromising other performance criteria. The NTE938 and NTE938M offer extremely low input offset voltage and drift specifications allowing usage in even the most critical applications without external offset nulling. Features: D Available in Two Packages Styles: 8–Lead Metal Can (NTE938) 8–Lead DIP (NTE938M) D Operation From a Wide Range of Power Supply Voltages D Low Input Bias and Offset Currents D Low Input Offset Voltage and Guaranteed Offset Voltage Drift Performance D High Input Impedance Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Power Supply Voltage, VCC, VEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18V Input Voltage (Note 1), VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±15V Input Differential Current (Note 2), IID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10mA Output Short–Circuit Duration, tS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indifinite Operating Junction Temperature, TJ NTE938 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +175°C NTE938M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Note 1. For supply voltages less than ±15V, the maximum input voltage is equal to the supply voltage. Note 2. The inputs are shunted with back–to–back diodes for over–voltage protection. Therefore, excessive current will flow if a differential input voltage in excess of 1.0V is applied between the inputs unless some limiting resistance is used. Electrical Characteristics: (TA = +25°C, 5V ≤ VCC ≤ 15V, –15V ≤ VEE ≤ –5V unless otherwise specified) Parameter Symbol Input Offset Voltage Test Conditions Min Typ Max Unit – 2.0 7.5 mV – – 10 mV – 0.2 1.0 nA – – 1.5 nA – 1.5 7.0 nA – – 10 nA 10 40 – MΩ VCC = +15V, VEE = –15V – ±0.3 ±0.8 mA VCC = +15V, VEE = –15V, VO = ±10V, RL ≥ 10kΩ 25 300 – V/mV VCC = +15V, VEE = –15V, VO = ±10V, RL ≥ 10kΩ, TA = 0° to +70°C 15 – – V/mV VIO TA = 0° to +70°C Input Offset Current IIO TA = 0° to +70°C Input Bias Current IIB TA = 0° to +70°C Input Resistance rI Power Supply Currents ICC, IEE Large Signal Voltage Gain AVOL Average Temperature Coefficient of Input Offset Temperature ∆VIO/∆T 0° ≤ TA ≤ +70°C – 6 30 µV/°C Average Temperature Coefficient of Input Offset Current ∆IIO/∆T – 2 10 pA/°C VCC = +15V, VEE = –15V ±14 – – V Input Voltage Range VIR Common Mode Rejection Ratio CMRR RS ≤ 50kΩ 80 100 – dB Supply Voltage Rejection Ratio PSRR RS ≤ 50kΩ 80 96 – dB VCC = +15V, VEE = –15V, RL = 10kΩ ±13 ±14 – V Output Voltage Range VOR Pin Connection Diagram NTE938 (Top View) Output N.C. 5 6 V (+) 7 Compensation 2 4 V (–) 3 Non–Inverting Input 8 NTE938M 2 Inverting Input 1 Compensation 1 Compensation 1 1 8 Compensation 2 Invert Input 2 7 V (+) Non–Inverting Input 3 6 Output V (–) 4 5 N.C. NTE938 .370 (9.39) Dia Max .355 (9.03) Dia Max .177 (4.5) Max .492 (12.5) Min .018 (0.45) Dia Typ 2 3 4 1 45° 8 5 7 6 .032 (0.82) .200 (5.08) Dia NTE938M 8 5 .256 (6.52) Max 1 4 .300 (7.62) .300 (7.62) .150 (3.81) .100 (2.54) .070 (1.77) Min .393 (10.0) Max