Texas Instruments has developed an integrated, eight-channel, transmit/receive switch for ultrasound systems. The TX810 integrates a protection diode bridge and clamp diodes for each of its eight channels to prevent the high-voltage pulses of the transmitter from damaging the receive electronics of the ultrasound system. The device is said to save more than 50% board space over discrete solutions in portable to mid-range ultrasound systems, while the component reduction and easier handling brings higher reliability to designs. Programmable bias currents allow designers to adjust and reduce power consumption, with a 3-bit interface used to program a 7 mA range of bias currents and a power-down mode. Optimised insertion loss maintains integrity of input/output signal at 400 load with 0,9 dB at 7 mA bias current and 1,3 dB at 1 mA bias current.
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