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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 = +25C 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 +75C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +125C Electrical Characteristics: (TA = +25C, V+/V- = 15V, IABC = 500A unless otherwise specified)
Parameter Input Offset Voltage (VOS) Input Offset Voltage VOS Including Diodes Input Offset Change Input Bias Current IB TA = -20 to +75C Symbol VIO IABC = 5A Diode Base Current, ID = 500A 5A IABC 500A Test Conditions Min - - - - - - Typ 0.4 0.3 0.5 0.1 0.4 1.0 Max 5.0 5.0 5.0 - 5.0 8.0 Unit mV mV mV mV A A
Electrical Characteristics (Cont'd): (TA = +25C, V+/V- = 15V, IABC = 500A)
Parameter Forward Transconductance (gm) Symbol gm TA = -20 to +75C gm Tracking Peak Output Current IOP RL = 0, IABC = 5A RL = 0, IABC = 5A RL = 0, IABC = 500A RL = 0, TA = -20 to +75C Peak Output Voltage Positive Peak Output Voltage Negative Supply Current VOS Sensitivity Positive VOS Sensitivity Negative Input Offset Current CMMR Common Mode Range Cross Talk Differential Input Current Leakage Current Input Resistance Open Loop Bandwidth Slew Rate Buffer Input Current Peak Buffer Output Voltage SR Note 2 Note 2 IIO CMR VICM CT IID ILEAK RIN 20Hz < f < 20kHz, Note 2 IABC = 0, Input = 4V IABC = 0 ICC SVR VOP RL = , 5A IABC 500A RL = , 5A IABC 500A IABC = 500A, two circuit VOS/V+ VOS/V- Test Conditions Min 6700 5400 - - 350 300 +12 -12 - 76.5 76.5 - 80 12.0 - - - 10 - - - 10 Typ 9600 - 0.3 5.0 500 - 14.2 -14.4 2.6 94.0 94.0 0.1 110 13.5 -100 0.02 0.2 26 2 50 0.4 - Max Unit 13000 mhos - - - 650 - - - - - - 0.6 - - 100 100 0 - - - 5.0 - mhos dB A A A V V mA dB dB A dB V dB nA nA k MHz V/s A V
Note 1. Open unless otherwise specified. The inputs to the buffers are grounded and the outputs are open. Note 2. ROUT = 5k connected from the buffer output to V- and the input buffer is connected to the transconductance amplifier output. IABC = 500A.
Pin Connection Diagram
Amp Bias Input A 1 Diode Bias A 2 Non-Inverting Input A 3 Inverting Input A 4 Output A 5 V- 6 Buffer Input A 7 Buffer Output A 8
16 Amp Bias Input B 15 Diode Bias B 14 Non-Inverting Input B 13 Inverting Input B 12 Output B 11 V+ 10 Buffer Input B 9 Buffer Output B
16
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)

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