NTE7236 Integrated Circuit Quadruple Norton Operational Amplifier 14−Lead DIP Type Package Description: The NTE7236 consists of four independent, high−gain frequency−compensated Norton operational amplifiers in a 14−lead DIP type package that are designed specifically to operate from a single supply over a wide range of voltages. Operation from split supplies is also possible. The low supply current drain is essentially independent of the magnitude of the supply voltage. This device provides wide bandwidth and a large output voltage swing. Features: D Wide Range of Supply Voltages, Single or Dual Supplies D Wide Bandwidth D Large Output Voltage Swing D Output Short−Circuit Protection D Internal Frequency Compensation D Low Input Bias Current Absolute Maximum Ratings: (TA = 0_ to +70_C unless otherwise specified) Supply Voltage (Note 1), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V Input Current, IIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Duration of Output Short Circuit (One Amplifier) to GND at (or Below) +25_C Free−Air Temperature (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited Continuous Total Dissipation (TA 3 +25_C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1150mW Derate Above +25_C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.2mW/_C Continuous Total Dissipation (TA = +70_C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 736mW Operating Free−Air Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0_ to +70_C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65_ to +150_C Lead Temperature (During Soldering, 1/16” from case, 10sec max), TL . . . . . . . . . . . . . . . . +260_C Note 1. All voltage values, except differential voltages, are with respect to the network ground terminal. Note 2. Short circuits from outputs to VCC can cause excessive heating and eventual destruction. Recommended Operating Conditions: Parameter Symbol Test Conditions Min Typ Max Unit Supply Voltage, Single Supply VCC 4.5 − 32 V Supply Voltage, Dual Supply VCC+ 2.2 − 16 V VCC− −2.2 − −16 V − − −1 mA 0 − 70 _C Input Current IIN Operating Free−Air Temperature TA Note 3 Note 3. Clamp transistors are included to prevent the input voltages from swinging below ground more than approximately −0.3V. The negative input currents that may result from large signal overdrive with capacitance input coupling must be limited externally to values of approximately −1mA. Negative input currents in excess of −4mA causes the output voltage to drop to a low voltage. These values apply for any one of the input terminals. If more than one of the input terminals are simultaneously driven negative, maximum currents are reduced. Common−mode current biasing can be used to prevent negative input voltages. Electrical Characteristics: (VCC = 15V, TA = +25_C, Note 4 unless otherwise specified) Parameter Input Bias Current (Inverting Input) Symbol IIB Mirror Gain Test Conditions II+ = 0 Min Typ Max Unit TA = +25_C − 30 200 nA TA = 0_ to +70_C − 300 − nA 0.9 − 1.1 mA/mA − 2% 5% − 10 500 mA 1.2 2.8 − V/mV Change in Mirror Gain II+ = 20mA to 200mA, TA = 0_ to +70_C, Note 5 Mirror Current VI+ = VI−, TA = 0_ to +70_C, Note 5 Large−Signal Differential Voltage Amplification AVD Input Resistance (Inverting Input) ri − 1 − MW Output Resistance ro − 8 − kW Unity−Gain Bandwidth (Inverting Input) B1 − 2.5 − MHz Supply Voltage Rejection Ratio (DVCC/DVIO) kSVR − 70 − dB High−Level Output Voltage VOH 13.5 − − V − 29.5 − V VO = 10V, RL = 10Wk, f = 100Hz II+ = 0, II− = 0 RL = 2kW VCC = 30V, No Load Low−Level Output Voltage VOL II+ = 0, II− = 10mA, RL = 2kW − 0.09 0.2 V Short−Circuit Output Current (Output Internally High) IOS II+ = 0, II− = 0, VO = 0 −6 −10 − mA 0.5 1.3 − mA − 5 − mA − 6.2 10 mA Pulldown Current Low−Level Output Current IOL Supply Current (Four Amplifiers) ICC II−= 5mA, VOL = 1V, Note 6 Note 4. All characteristics are measured under open−loop conditions with zero common−mode voltage unless otherwise specified. Note 5. These parameters are measured with the output balanced midway between VCC and GND. Note 6. The output current−sink capability can be increased fo large−signal conditions by overdriving the inverting input. Operating Characteristics: (VCC = $15V, TA = +25_C, unless otherwise specified) Parameter Slew Rate at Unity gain Low−to−High Output High−to−Low Output Symbol SR Test Conditions VO = 10V, CL = 100pF, RL = 2kW Min Typ Max Unit − 0.5 − V/ms − 20 − V/ms Application Information: Norton (or current−differencing) amplifiers can be used in most standard general purpose operational amplifier applications. Performance as a DC amplifier in a single−power−supply mode is not as precise as a standard integrated circuit operational amplifier operating from dual supplies. Operation of the amplifier can best be understood by noting that input currents are differenced at the inverting input terminal and this current then flows through the external feedback resistor to produce the output voltage. Common−mode current biasing is generally useful to allow operating with signal levels near (or even below) ground. Internal transistors clamp negative input voltages at approximately −0.3V but the magnitude of current flow has to be limited by the external input network. For operation at high temperature, this limit should be approximately −100mA. Noise immunity of a Norton amplifier is less than that of standard bipolar amplifiers. Circuit layout is more critical since coupling from the output to the non−inverting input can cause oscillations. care must also be exercised when driving either input from a low−impedance source. A limiting resistor should be placed in series with the input lead to limit the peak input current. Current up to 20mA will not damage the device, but the current mirror on the non−inverting input will saturate and cause a loss of mirror gain at higher current levels, especially at high operating temperatures. Pin Connection Diagram Non−Inverting Input 1 1 14 VCC Non−Inverting Input 2 2 13 Non−Inverting Input 3 Inverting Input 2 3 12 Non−Inverting Input 4 Output 2 4 11 Inverting Input 4 Output 1 5 10 Output 4 Inverting Input 1 6 9 Output 3 GND 7 8 Inverting Input 3 14 8 1 7 .785 (19.95) Max .300 (7.62) .200 (5.08) Max .100 (2.45) .600 (15.24) .099 (2.5) Min