MAX4936A
Octal High-Voltage Transmit/Receive
Switches
Integrated Transmit/Receive Switches Significantly Reduce
Component Count While Reducing Power
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OVERVIEW
Description
The MAX4936A/MAX4937A are octal, high-voltage, transmit/receive
(T/R) switches. The T/R switches are based on a diode bridge
topology, and the amount of current in the diode bridges can be
programmed by three digital inputs (S0, S1, and S2). Two control
inputs (EN1 and EN2) allow enabling/disabling channels 1–4 and
channels 5–8, respectively. The MAX4936A includes the T/R switch
and grass-clipping diodes, performing both transmit and receive
operations. The MAX4937A includes just the T/R switch and performs
the receive operation only.
These devices feature low on-impedance in the entire ultrasound
frequency range with extremely low power dissipation of 15mW (typ)
per channel.
The receive path for both devices is low impedance during low-
voltage receive and high impedance during high-voltage transmit,
providing protection to the receive circuitry. The low-voltage receive
path is high bandwidth, low noise, low distortion, and low jitter.
The MAX4936A SWC_ pins can be driven with high-voltage signals
using the anti-parallel diodes as grass clippers while connecting the
SWB_ pins to the low-noise amplifier (LNA). Connecting SWC_ to
