The THS7530 device is designed for nominal 5-V power supply from V_S+ to V_S–.

The amplifier has fully differential inputs, V_IN+ and V_IN–, and fully differential outputs, V_OUT+ and V_OUT– The inputs are high impedance and outputs are low impedance. External resistors are recommended for impedance matching and termination purposes.

The inputs and outputs can be DC-coupled, but for best performance, the input and output common-mode voltage should be maintained at the midpoint between the two supply pins. The output common-mode voltage is controlled by the voltage applied to V_OCM. Left unterminated, V_OCM is set to midsupply by internal resistors. A 0.1-µF bypass capacitor should be placed between V_OCM and ground to reduce common-mode noise. The input common-mode voltage defaults to midrail when left unconnected. For voltages other than midrail, V_OCMmust be biased by external means. V_IN+ and V_IN– both require a nominal 30-µA bias current for proper operation. Therefore, ensure equal input impedance at each input to avoid generating an offset voltage that varies with gain.

Voltage applied from V_G– to V_G+ controls the gain of the part with 38.8-dB/V gain slope. The input can be differential or single ended. V_G– must be maintained within –0.6 V and 0.8 V of V_S–for proper operation. The negative gain input should typically be tied directly to the negative power supply.

V_CL+ and V_CL– are inputs that limit the output voltage swing of the amplifier. The voltages applied set an absolute limit on the voltages at the output. Input voltages at V_CL+ and V_CL– clamp the output, ensuring that neither output exceeds those values.

The power-down input is a TTL compatible input, referenced to the negative supply voltage. A logic low puts the THS7530 device in power-saving mode. In power-down mode the part consumes less than 1-mA current, the output goes high impedance, and a high amount of isolation is maintained between the input and output.

Power-supply bypass capacitors are required for proper operation. A 6.8-µF tantalum bulk capacitor is recommended if the amplifier is located far from the power supply and may be shared among other devices. A ceramic 0.1-µF capacitor is recommended within 0.1-in of the device power pin. The ceramic capacitors should be located on the same layer as the amplifier to eliminate the use of vias between the capacitors and the power pin.