TI LM96551SQ

LM96551
LM96551 Ultrasound Transmit Pulser
Literature Number: SNAS511A
LM96551
Ultrasound Transmit Pulser
General Description
Features
The LM96551 is an eight-channel monolithic high-voltage,
high-speed pulse generator for multi-channel medical ultrasound applications. 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 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 continuous-wave (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 onchip temperature sensing and power-down logic.
■
■
■
■
■
■
■
Applications
■ Ultrasound Imaging
■
■
■
■
■
■
■
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
Key Specifications
Output voltage
Output peak current
Output pulse rate
Rise/fall delay
matching (max)
Pulser HD2 (5 MHz)
Operating Temp.
±50
±2.0
Up to 15
< 3.7
V
A
MHz
ns
-40
0 to +70
dB
°C
Block Diagram
30140102
© 2011 Texas Instruments Incorporated
301401
www.ti.com
LM96551 Ultrasound Transmit Pulser
November 30, 2011
LM96551
Typical Application
8-Channel Transmit/Receive Chipset
30140107
www.ti.com
2
LM96551
Pin Diagram
30140101
FIGURE 1. Pin Diagram of LM96551
Ordering Information
Order Number
Package Type
NSC Package Drawing
LM96551SQ
LM96551SQE
Supplied As
1000
80 Lead LLP
SQA80A
LM96551SQX
250
2000
3
www.ti.com
LM96551
TABLE 1. Pin Descriptions
Pin No.
Name
Type
Function and Connection
21, 23, 25, 27, 33, 35, 37,
39
PIN
n=0...7
Input
Logic control positive output channel P
1 = ON
0 = OFF
22, 24, 26, 28, 34, 36, 38,
40
NIN
n=0...7
Input
Logic control negative output channel N
1 = ON
0 = OFF
59, 60
VOUT7
62, 63
VOUT6
65, 66
VOUT5
68, 69
VOUT4
72, 73
VOUT3
75, 76
VOUT2
78, 79
VOUT1
1, 2
VOUT0
29
EN
Input
Chip power enable
1 = ON
0 = OFF
31
MODE
Input
Output current mode control
1 = Max Current
0 = Low Current
Output
High voltage output of channels 0 to 7
30
OTP
Output
Over-temperature indicating IC temp > 125°C
0 = Over-temperature
1 = Normal temperature
This pin is open-drain.
4, 5, 6, 7, 54, 55, 56, 57
VPP
Power
Positive high voltage power supply (+3.3V to +50V)
11, 12, 13, 14, 47, 48, 49,
50
VNN
Power
Negative high voltage power supply (-3.3V to -50V)
8, 53
VPF
Power
Positive internal floating power supply (VPP -10V)
10, 51
VNF
Power
Negative internal floating power supply (VNN +10V)
18, 43
VDD
Power
Positive level-shifter supply voltage (+10V)
16, 45
VDN
Power
Negative level-shifter supply voltage (-10V)
20, 41
VLL
Power
Logic supply voltage. Hi voltage reference input (+2.5 to +5V)
VSUB
Power
All VSUB pins must be connected to most negative potential of
the IC.
NOTE: The exposed thermal pad is connected to VSUB.
HVGND
Ground
High voltage reference potential (0V)
AGND
Ground
Analog and Logic voltage reference input, logic ground (0V)
0, 15, 46
3, 9, 52, 58, 61, 64, 67, 70,
71, 74, 77, 80
17, 19, 32, 42, 44
www.ti.com
4
Operating Ratings
If Military/Aerospace specified devices are required,
please contact the Texas Instruments Sales Office/
Distributors for availability and specifications.
Operation Junction Temperature
VPP, −VNN; High-voltage supply
VDD, −VDN; Level-shift supply
VLL, Logic Supply
VSUB, Substrate bias supply
Maximum Junction Temperature (TJMAX)
Storage Temperature Range
Supply Voltage (VDD)
Supply Voltage (VDN)
Supply Voltage (VPP)
Supply Voltage (VNN)
Supply Voltage (VSUB)
IO Supply Voltage (VLL)
Voltage at Logic Inputs
+150°C
−40°C to +125°C
–0.3V to +12V
+0.3V and −12V
–0.3V and +55V
+0.3V and −55V
−65V
−0.3V to +5.5V
−0.3V to VLL
+0.3V
0°C to + 70°C
+3.3V to +50V
+9V to 11V
+2.4V to +5.3V
must be most
negative supply
Package Thermal Resistance (θJA )
ESD Tolerance
Human Body Model
Machine Model
Charge Device Model
19.7 °C/W
2KV
150V
750V
Analog Characteristics
Unless otherwise stated, the following conditions apply
VLL = +3.3V, VPP = −VNN = 50V, VSUB = −55V, VDD = −VDN = 10V, RL = 2KΩ, TA = 25°C, Fin=5MHz, Mode = LO, EN = HI.
Symbol
FOUT
Parameter
Conditions
Min
Output Frequency Range RL = 100Ω
Typ
1
Output Voltage Range
-48.5
Output Current
2% Duty Cycle
Output Current
100% Duty Cycle,
Mode=HI
0.6
HD2
Second harmonic
distortion
RL = 100Ω, CL = 330pF
-40
RON
Output ON Resistance
100 mA
7
Output clamp
Positive or Negative pulse
2
Power Supply Current
Max
Units
15
MHz
+48.5
V
2
Pin = Nin = LO
En = LO
A
dBc
11
Ω
A
VPP
3.2
VNN
3.4
7
8
VDD
12
18
VDN
8
13
VLL
25
50
µA
VSUB
0.7
6
mA
VPP
3.2
7
VNN
3.4
8
VDD
4
7
VDN
3
6.5
VLL
25
50
µA
VSUB
0.7
6
mA
mA
mA
OTP
Over Temperature
Protection
125
°C
σOTP
OTP sigma
3.0
°C
HsysOTP
OTP hysteresis
5.5
°C
5
www.ti.com
LM96551
Absolute Maximum Ratings (Note 1)
LM96551
AC and Timing Characteristics
Unless otherwise stated, the following conditions apply
VLL = +3.3V, VDD = −VDN = 10V, VSUB = −55V, VPP = −VNN = 50V, RL = 100Ω, CL = 330pF, Fin=5MHz, TA = 25°C. Mode =
LO, EN = HI.
Typ
Max
tr
Symbol
Output rise time
Parameter
Conditions
Min
19
29
tf
Output fall time
19
29
tE
Enable time
1
tdr
Delay time on inputs rise
32
39
tdf
Delay time on inputs fall
32
39
| tdr - tdr |
Delay time mismatch
tdm
Delay on mode change
P-to-N (see Note 2)
Unit
ns
µs
ns
3.7
1
µs
DC Characteristics
Unless otherwise stated, the following conditions apply.
VLL = +3.3V, VDD = −VDN = 10V, VSUB = −55V, VPP = −VNN = 50V, TA = 25°C,
Symbol
Parameter
VIL
Low Input “LO” threshold
VIH
High Input “HI” threshold
IIN
input current
Conditions
Min
Typ
2.3
Max
Unit
1
V
V
1
µA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is guaranteed to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
Note 2: The delay time mismatch can be adjust to be less than 0.8ns with the LM96570 duty cycle control function.
Note 3: 10.24 MHz Differential Input signal from LMK04800 Evaluation board with 122.88 MHz Crystek CVHD-950 VCXO clock source. The LMK04800 clock
output channel was configured with a divide value of 12 and LVCMOS outputs with opposite polarity.
www.ti.com
6
The LM96551 pulser provides an 8-channel transmit side solution for medical ultrasound applications suitable for integra-
30140102
FIGURE 2. Block Diagram of High-Voltage
Pulser Channel
A functional block diagram of the LM96551 is shown in . It has
an input buffer at its CMOS logic interface, which is powered
by VLL (2.5 to 5.0V). When EN=HI, driving a channel’s inputs
(PIN n or NIN n) HI will result in a positive or negative pulse
at the channel’s output pin (VOUT n), respectively. The output
pins VOUT are pulled to either the positive or negative supplies, VPP or VNN by power MOSFETs.
When PIN and NIN are both LO, Vout is actively clamped to
GNDHI at 0V. This clamping reduces harmonic distortions
compared to competing architectures that use bleeding resistors for implementing the return to zero of the output. The
user must avoid the condition in which PIN and NIN are
both HI simultaneously, as this will damage the output
stage!
The impedance of the output stage can be controlled via the
Mode-pin. When the Mode = HI as shown, only one output
transistor pair drives the output resulting in a peak current of
600 mA at VPP = -VNN = 50V. When Mode=LO, a peak-current of 2A is achievable resulting in faster transients at the
output. However, faster output transients can lead to significant overshoot of the output signal. This can be avoided using
the lower drive current option.
Continuous-wave (CW) applications are supported for low
power consumption down to VPP = -VNN = 3.3V with Mode
=HI.
Internally, the CMOS logic input signals are level shifted to
VDD = 10V and VDN = -10V for pulse transmission. The outputs of the level shifter drive the high-voltage P and N drivers
that control the output power MOSFETs, which are supplied
from the positive and negative rails VPP and VNN, respectively. The high-voltage rails are designed for a maximum of
50V; however, they can be operated down to 3.3V. The necessary gate-overdrive voltage levels for the output drivers are
internally generated from the high-voltage rails.
Over-Temperature Protection (OTP) is implemented by continuously monitoring the on-chip temperature. The OTP output (open drain) pin goes LO when the chip temperature
exceeds a critical level. Prior to this event, the user must ensure that the chip is powered down before fatal damage
occurs. In addition to a primary software controlled safety
shutdown, the OTP pin can be also be hard-wired to the EN
pin as a secondary safety measure.
7
www.ti.com
LM96551
tion into multi-channel (128/256 channel) systems. Its flexible,
integrated ±50V pulser architecture enables low-power designs targeting portable systems. A complete system can be
designed using National’s companion LM965XX chipset.
Overview
LM96551
Timing Diagrams
RISE AND FALL TIME
The timing diagram shown in Figure 3 defines the rise and fall
times tr and tf.
30140104
FIGURE 3. Timing Diagram Defining Rise and Fall Times
tr and tf, respectively
INPUT TO OUTPUT DELAY
The timing diagram shown in Figure 4 defines the delays between the input and output signals.
30140105
FIGURE 4. Timing Diagram Defining Input-to-Output Delays Times
www.ti.com
8
Unless otherwise stated, the following conditions apply
VLL = +3.3V, VDD = −VDN = 10V, VSUB = −55V, VPP = −VNN = 50V, RL = 100Ω, CL = 330pF, Fin=5MHz, TA = 25°C. Mode =
LO, EN = HI
Return-to-Zero Rise Time (RL=2KΩ)
Return-to-Zero Fall Time (RL=2KΩ)
30140109
30140108
Harmonic Distortion (8 pulses)
Differential Input vs. Pulser Output Phase Noise (Note 3)
30140110
30140111
Constant 5W Total Power RL=300Ω
100% CW mode, Mode=HI, VSUB=-10V
Over Temperature Protection
120
9
100
8
80
# of Samples
CW Frequency (MHz)
10
7
CL=150pF
6
5
CL=330pF
4
40
20
CL=470pF
3
60
2
0
114
1
3
4
5
6
7
VPP=-VNN (V)
8
134
OTP Trip Point (°C)
9
30140113
30140112
9
www.ti.com
LM96551
Typical Performance Characteristics
LM96551
Functional Description
Note that the case, PINn = NNn = HI is not allowed as it will damage the output transistors.
Logic inputs
Output
EN
PINn
NINn
Voutn
1
0
0
0V
1
1
0
VPP - 0.7V
1
0
1
VNN + 0.7V
1
1
1
not allowed
0
X
X
0V
Applications
POWER-UP AND POWER-DOWN SEQUENCES
VSUB must always be the most negative supply, i.e., it must be equal to or more negative than the most negative supply, VNN or
VDN.
Power UP Sequence:
1.
2.
3.
Turn ON VSUB, hold EN pin LO
Turn On VLL
Turn ON VDD, VDN, VPP, and VNN
Power DOWN Sequence:
1.
2.
3.
Turn OFF VDD, VDN, VPP & VNN
Turn OFF VLL
Turn OFF VSUB
www.ti.com
10
LM96551
Physical Dimensions inches (millimeters) unless otherwise noted
80-Lead LLP Package
NS Package Number SQA80A
11
www.ti.com
LM96551 Ultrasound Transmit Pulser
Notes
TI/NATIONAL INTERIM IMPORTANT NOTICE
Texas Instruments has purchased National Semiconductor. As of Monday, September 26th, and until further notice, products sold or
advertised under the National Semiconductor name or logo, and information, support and interactions concerning such products, remain
subject to the preexisting National Semiconductor standard terms and conditions of sale, terms of use of website, and Notices (and/or
terms previously agreed in writing with National Semiconductor, where applicable) and are not subject to any differing terms and notices
applicable to other TI components, sales or websites. To the extent information on official TI and National websites and business social
networking media, etc., pertains to both TI and National-branded products, both companies' instructions, warnings and limitations in the
above-referenced terms of use apply.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
www.ti.com/audio
Communications and Telecom
www.ti.com/communications
Amplifiers
amplifier.ti.com
Computers and Peripherals
www.ti.com/computers
Data Converters
dataconverter.ti.com
Consumer Electronics
www.ti.com/consumer-apps
DLP® Products
www.dlp.com
Energy and Lighting
www.ti.com/energy
DSP
dsp.ti.com
Industrial
www.ti.com/industrial
Clocks and Timers
www.ti.com/clocks
Medical
www.ti.com/medical
Interface
interface.ti.com
Security
www.ti.com/security
Logic
logic.ti.com
Space, Avionics and Defense
www.ti.com/space-avionicsdefense
Power Mgmt
power.ti.com
Transportation and Automotive
www.ti.com/automotive
Microcontrollers
microcontroller.ti.com Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
www.ti.com/wireless-apps
RF/IF and ZigBee® Solutions www.ti.com/lprf
Wireless
TI E2E Community Home Page e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright© 2011 Texas Instruments Incorporated
www.ti.com
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
www.ti.com/audio
Communications and Telecom www.ti.com/communications
Amplifiers
amplifier.ti.com
Computers and Peripherals
www.ti.com/computers
Data Converters
dataconverter.ti.com
Consumer Electronics
www.ti.com/consumer-apps
DLP® Products
www.dlp.com
Energy and Lighting
www.ti.com/energy
DSP
dsp.ti.com
Industrial
www.ti.com/industrial
Clocks and Timers
www.ti.com/clocks
Medical
www.ti.com/medical
Interface
interface.ti.com
Security
www.ti.com/security
Logic
logic.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Power Mgmt
power.ti.com
Transportation and Automotive www.ti.com/automotive
Microcontrollers
microcontroller.ti.com
Video and Imaging
RFID
www.ti-rfid.com
OMAP Mobile Processors
www.ti.com/omap
Wireless Connectivity
www.ti.com/wirelessconnectivity
TI E2E Community Home Page
www.ti.com/video
e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2011, Texas Instruments Incorporated