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LM96551
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SNAS511B – OCTOBER 2011 – REVISED MAY 2013
LM96551 Ultrasound Transmit Pulser
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FEATURES
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•2 8-Channel High-Voltage CMOS Pulse Generator
• Output Pulses with ±50V and 2A Peak Current • Active Damper with Built-In Blocking Diodes • Built-In Floating Supply Voltages for Output
Stage • Up to 15 MHz Operating Frequency • Matched Delays for Rising and Falling Edges • Low Second Harmonic Distortion Allows and
Improves Harmonic Imaging • Continuous-Wave (CW) Operation Down to
±3.3V • Low Phase Noise Enables Doppler
Measurements – -145 dBc/Hz Phase Noise at 10 MHz (1 kHz
offset) • Output State Over-Temperature Protection • Blocking Diodes for Direct Interface to
Transducer • 2.5V to 5.0V CMOS Logic Interface • Low-Power Consumption per Channel • Over Temperature Protection
APPLICATIONS
• Ultrasound Imaging
DESCRIPTION
The LM96551 is an eight-channel monolithic highvoltage, high-speed pulse generator for multi-channel medical ultrasound applications. It is well-suited for use with Texas Instrument’s LM965XX series chipset which offers a complete medical ultrasound solution targeted towards low-power, portable systems.
The LM96551 contains eight high-voltage pulsers with integrated diodes generating ±50V bipolar pulses with peak currents of up to 2A and pulse rates of up to 15 MHz. Advanced features include low-jitter and low-phase-noise output pulses ideal for continuouswave (CW) modes of operation. Active clamp circuitry is integrated for ensuring low harmonic distortion of the output signal waveform.
The LM96551 also featuers a low-power operation mode and over-temperature protection (OTP) which are enabled by on-chip temperature sensing and power-down logic.
KEY SPECIFICATIONS
• Output voltage ±50 V • Output peak current ±2.0 A • Output pulse rate Up to 15 MHz • Rise/fall delay matching (max) < 3.7 ns • Pulser HD2 (5 MHz) -40 dB • Operating Temp. 0 to +70 °C
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 2011–2013, Texas Instruments Incorporated
LM96551
SNAS511B – OCTOBER 2011 – REVISED MAY 2013
Block Diagram
VLL VDD
VDN
VPF
VPP
MOD
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EN
PIN n NIN n
Input Buffer
Level Shifter
OTP
Temp Sensor
Regulates
Level Shifter
Up
Buffer
Level Shifter Down
Buffer
Vout n
Active Damper
AGND
Typical Application
VSUB
VNF
VNN
HVGND
Figure 1. 8-Channel Transmit/Receive Chipset
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Pin Diagram
LM96551
SNAS511B – OCTOBER 2011 – REVISED MAY 2013
HVGND Vout1 Vout1 HVGND Vout2 Vout2 HVGND Vout3 Vout3 HVGND HVGND Vout4 Vout4 HVGND Vout5 Vout5 HVGND Vout6 Vout6 HVGND
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
Vout0 1
60 Vout7
Vout0 2
59 Vout7
HVGND 3
0: VSUB
58 HVGND
VPP 4
57 VPP
VPP 5
56 VPP
VPP 6
55 VPP
VPP 7
54 VPP
VPF 8
53 VPF
HVGND 9 VNF 10 VNN 11
LM96551 LLP
52 HVGND 51 VNF 50 VNN
VNN 12
49 VNN
VNN 13
48 VNN
VNN 14
47 VNN
VSUB 15
46 VSUB
VDN 16
45 VDN
AGND 17
44 AGND
VDD 18
43 VDD
AGND 19
42 AGND
VLL 20
41 VLL
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Pin0 Nin0 Pin1 Nin1 Pin2 Nin2 Pin3 Nin3
EN OTP MODE AGND Pin4 Nin4 Pin5 Nin5 Pin6 Nin6 Pin7 Nin7
Figure 2. WQFN Package See Package Number NKF0080A
Copyright © 2011–2013, Texas Instruments Incorporated
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LM96551
SNAS511B – OCTOBER 2011 – REVISED MAY 2013
Pin No.
21, 23, 25, 27, 33, 35, 37, 39
22, 24, 26, 28, 34, 36, 38, 40
59, 60 62, 63 65, 66 68, 69 72, 73 75, 76 78, 79 1, 2
29
31
Name
PIN n=0...7
NIN n=0...7
VOUT7 VOUT6 VOUT5 VOUT4 VOUT3 VOUT2 VOUT1 VOUT0
EN
MODE
30
4, 5, 6, 7, 54, 55, 56, 57 11, 12, 13, 14, 47, 48, 49, 50 8, 53 10, 51 18, 43 16, 45 20, 41
0, 15, 46
3, 9, 52, 58, 61, 64, 67, 70, 71, 74, 77, 80 17, 19, 32, 42, 44
OTP
VPP VNN VPF VNF VDD VDN VLL VSUB
HVGND AGND
PIN DESCRIPTIONS
Type
Function and Connection
Input
Logic control positive output channel P 1 = ON 0 = OFF
Input
Logic control negative output channel N 1 = ON 0 = OFF
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Output
High voltage output of channels 0 to 7
Input
Input
Output
Power Power Power Power Power Power Power Power Ground Ground
Chip power enable 1 = ON 0 = OFF Output current mode control 1 = Max Current 0 = Low Current Over-temperature indicating IC temp > 125°C 0 = Over-temperature 1 = Normal temperature This pin.