Status
Active: Data sheet on request only
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 GND allows
the internal anti-parallel diodes to be used as clamps.
Grass-clipping diodes can then be connected to SWB_
and the LNA to SWA_.
Both devices are available in a small, 42-pin, 3.5mm x
9mm TQFN package, and are specified over the commercial
0°C to +70°C temperature range.
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Data Sheet
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