HV7322
8-Channel 7-Level ±80V High-Voltage Pulser with T/R Switches
Features
Description
• High-Voltage CMOS Technology for High
Performance
The HV7322 device is an 8-channel, true 5-level or
pseudo 7-level, high-voltage pulser, with integrated T/R
switches. HV7322 is designed for medical ultrasound
applications. It is also fitted for NDT and other
transducer drive applications.
• 8-Channel, True 5-Level or Pseudo 7-Level,
±80V, 2A, with Return-to-Zero (RTZ) to True Zero
Voltage
• Programmable ±0.5A, 1.0A, 1.5A and 2A Output
Current from VPP1/VNN1
The HV7322 device’s output has seven different volt-
age levels: VPP0,1,2, VNN0,1,2 and GND. The output
MOSFET transistors can provide up to ±2A of current
at the maximum voltage of ±80V. HV7322 has channel
RTZ for the return-to-zero feature. The three sets of
high-voltage outputs, with ±2A of peak output current in
B-Mode and programmable 2-bit, use the VPP1/VNN1
voltage rails for the CW-Mode (IM<1:0> = 0), in order to
reduce the CW-Mode power dissipations on chip.
• Integrated Radio Frequency (RF) Blocking,
Clamp Diode and RX Damp
• 13 Transmit/Receive (T/R) and Low Voltage
(LV) Switches Allow Receiver Multiplexing
• 160 Auto-Bleeding Switches for RTZ True Zero
• 220 MHz Clock Retiming Synchronization
Capability
The high-voltage T/R and LV analog switches (total
13) and RX damp switch are Integrated in each chan-
nel, while the 160 RTZ switches dedicated for true
zero voltage minimize the received noise.
• 2.5V, 3.3V Logic Control Voltage, designed to
work with FPGA Inputs and Outputs (I/O) directly.
• Adjusting T/R Switch Delay, Avoid Echo
Saturating
The 220 MHz differential retiming clock inputs and
built-in registers are capable of providing low jitter in
Continuous Wave Doppler (CWD) mode, in Pulse
Wave (PW) mode or in B-mode. The clock synchroni-
zation realigns the logic input signals to a master clock,
which reduces various propagation delays caused by
FPGA inaccuracies and/or long PCB traces.
• TX Output Frequency up to 20 MHz
• -40 dB HD2 Second Harmonic Distortion at
5 MHz
• 12 mm x 12 mm x 1.20 mm 206-Lead TFBGA
Package
Applications
The integrated circuit (IC) has built-in gate-driver float-
ing voltage regulators, allowing VPP0,1,2 and VNN0,1,2
high-voltage rails to move the voltage interdependently
from 0 to ±80V or to 60V. Each of the pulsers has output
voltage overshoot clamping diodes to the highest level
of the supply pin of VPP0 or VNN0 rails respectively. The
differential clock inputs take Differential Clock or
LVCMOS output signals. The logic control voltages are
designed to work with the Differential Clock or the
LVCMOS logic families directly.
• Medical ultrasound imaging system
• NDT (nondestructive testing) ultrasound
transmission pulsers
• Piezoelectric or capacitive transducer drivers
2017 Microchip Technology Inc.
DS20005920A-page 1