Datasheet

LM96570
September 15, 2011
Ultrasound Configurable Transmit Beamformer
General Description
The LM96570 is an eight-channel monolithic beamformer for
pulse generators in multi-channel medical ultrasound appli-
cations. It is well-suited for use with National’s LM965XX
series chipset which offers a complete medical ultrasound
solution targeted towards low-power, portable systems.
The LM96570 offers eight P and N output channels with indi-
vidual delays of up to 102.4 µs operating at pulse rates of up
to 80 MHz. A pulse sequence is launched on all channels si-
multaneously through a single firing signal. Advanced fea-
tures include delay resolution down to 0.78 ns and pro-
grammable patterns of up to 64 pulses. Pulse patterns and
delay settings are pre-programmed through a serial interface,
thereby simplifying the timing requirements on the driving cir-
cuitry.
The LM96570 is packaged in a 32-pin LLP.
Applications
■
Ultrasound Imaging
Features
■
Full control over selecting beam directions and pulse
patterns by programming individual channel parameters
■
Outputs interface seamlessly with positive and negative
inputs on octal high-voltage pulser ICs
■
Beamformer timing provides:
—
Delay resolution of 0.78 ns
—
Delay range of up to 102.4 μs
■
Pulse patterns are locally generated with:
—
Sequences of up to 64 pulses
—
Adjustable Pulse widths
■
2.5V to 3.3V CMOS logic interface
Key Specifications
I/O voltage 2.5 to 3.3 V
Core supply voltage 1.8 V
Output pulse rate 80 MHz
Reference frequency 40 (±5%) MHz
1σ Output Jitter
(@ 5MHz)
25 ps
Output Phase Noise
(@ 5MHz, 1kHz offset)
−116 dBc/Hz
Delay resolution 0.78 ns
Delay range 102.4
μs
Max. pattern length 64 pulses
Serial interface speed 80 Mbps
Total Power 0.063 Watts
Operating Temp. 0 to +70 °C
Typical Application
8-Channel Transmit/Receive Chipset
30129703
© 2011 National Semiconductor Corporation 301297 www.national.com
LM96570 Ultrasound Configurable Transmit Beamformer