NTE870 Integrated Circuit Dual Operational Transconductance Amp Description: The NTE870 consists of two current controlled transconductance amplifiers each with differential inputs and a push–pull output. The two amplifiers share common supplies but otherwise operate independently. Linearizing diodes are provided at the inputs to reduce distortion and allow higher input levels resulting in a 10dB signal–to–noise improvement referenced to 0.5 percent THD. Controlled impedance buffers are provided which are especially designed to complement the dynamic range of the amplifiers. Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, V+/V– . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V or ±18V Differential Input Voltage, VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5V Diode Bias Current, ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA Amp Bias Current, IABC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA Buffer Output Current, Io . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570mW DC Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ to V– Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Electrical Characteristics: (TA = +25°C, V+/V– = ±15V, IABC = 500µA unless otherwise specified) Parameter Input Offset Voltage (VOS) Symbol Test Conditions VIO Min Typ Max Unit – 0.4 5.0 mV Input Offset Voltage IABC = 5µA – 0.3 5.0 mV VOS Including Diodes Diode Base Current, ID = 500µA – 0.5 5.0 mV Input Offset Change 5µA ≤ IABC ≤ 500µA – 0.1 – mV – 0.4 5.0 µA – 1.0 8.0 µA Input Bias Current IB TA = –20° to +75°C Electrical Characteristics (Cont’d): (TA = +25°C, V+/V– = ±15V, IABC = 500µA) Parameter Symbol Forward Transconductance (gm) gm Min Typ 6700 9600 TA = –20° to +75°C 5400 – – µmhos RL = 0, IABC = 5µA – 0.3 – dB RL = 0, IABC = 5µA – 5.0 – µA RL = 0, IABC = 500µA 350 500 650 µA RL = 0, TA = –20° to +75°C 300 – – µA RL = ∞, 5µA ≤ IABC ≤ 500µA +12 ±14.2 – V RL = ∞, 5µA ≤ IABC ≤ 500µA –12 –14.4 – V – 2.6 – mA ∆VOS/∆V+ 76.5 94.0 – dB ∆VOS/∆V– 76.5 94.0 – dB IIO – 0.1 0.6 µA CMMR CMR 80 110 – dB Common Mode Range VICM ±12.0 ±13.5 – V gm Tracking Peak Output Current Peak Output Voltage Positive IOP VOP Peak Output Voltage Negative Supply Current VOS Sensitivity Positive ICC SVR VOS Sensitivity Negative Input Offset Current Test Conditions IABC = 500µA, two circuit Max Unit 13000 µmhos Cross Talk CT 20Hz < f < 20kHz, Note 2 – –100 100 dB Differential Input Current IID IABC = 0, Input = ±4V – 0.02 100 nA IABC = 0 – 0.2 0 nA 10 26 – kΩ – 2 – MHz – 50 – V/µs Leakage Current ILEAK Input Resistance RIN Open Loop Bandwidth Slew Rate SR Buffer Input Current Note 2 – 0.4 5.0 µA Peak Buffer Output Voltage Note 2 10 – – V Note 1. Open unless otherwise specified. The inputs to the buffers are grounded and the outputs are open. Note 2. ROUT = 5kΩ connected from the buffer output to V– and the input buffer is connected to the transconductance amplifier output. IABC = 500µA. Pin Connection Diagram Amp Bias Input A 1 16 Amp Bias Input B 15 Diode Bias B Diode Bias A 2 Non–Inverting Input A 3 14 Non–Inverting Input B Inverting Input A 4 13 Inverting Input B Output A 5 12 Output B V– 6 11 V+ Buffer Input A 7 10 Buffer Input B Buffer Output A 8 16 9 Buffer Output B 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)