Device Overview
Summary
The HV7358 is a 16-channel, 3-level high voltage ultrasound transmitter with built-in
programmable beamformer. Each channel can generate pulses up to ±80V with a T/R
switch and an active discharge back to 0V circuit. The output current can be programmed
for 0.3A, 0.5A, 1.0A and 1.6A.
The integrated transmit beamformer provides as fine as 5ns resolution for beamforming
delays. The delay clock for beamformer is generated by a built-in low-phase-noise
PLL. The HV7358 stores up to 4 sets of transmit patterns with a maximum of 256 pulses for
each pattern. Alternatively, the device also allows to program PWM duty cycle for each
individual channel.
The beamformer has an 8-bit divide-by-N counter to generate the CW frequency from the
input clock to support continuous wave Doppler operation. Once the CW frequency and the
channel delays are programmed, the CW transmission starts when the trigger signal is
asserted.
200MHz SPI over differential lines provides the programming interface for the beamformer
and pattern generator. The rest of the parameters are programmed through I2C. The built-
in beamformer and the daisy-chainable fast SPI interface greatly reduce the number of
required connections to FPGA.
The rich features of HV7358 make it particularly suitable for portable/ultraportable
ultrasound imaging devices.
Additional Features
16 channel with active return to true-zero
Up to ±80V output voltage & ±1.6A output current
Programmable output current: 0.3, 0.6, 1.2 & 1.6A
Output ultrasound frequency up to 30MHz
-40dB Second Harmonic at 5MHz, ±70V, 5-Cycle
Built-in T/R switch, damper diodes
Built-in linear regulators for floating gate driver
Internal low jitter PLL clock multiplier for Tx beamformer and Tx clock
30 to 80MHz LVDS input-clock frequencies in PLL mode.
30 to 240MHz LVDS input-clock frequencies in non-PLL mode
PLL frequency integer multiplier 1, 2, 3, 4, 5, 6 & 8.
Build-in transmit beamformer that allows 5ns delay resolution.
Guarantee synchronize internal transmit clock across devices to be in same phase
