ST AN3240 Application note

AN3240

Application note

Ultrasound HV pulser demonstration board

Introduction

This application note describes all the possible demo applications helpful in carrying out a full evaluation of STHV748 functions.

The STHV748 high-voltage, high-speed pulser generator features four independent channels. It is designed for medical ultrasound applications, but can also be used for other piezoelectric, capacitive, or MEMS transducers.

The device contains a controller logic interface circuit, level translators, MOSFET gate drivers, noise blocking diodes, and high-power P-channel and N-channel MOSFETs as output stages for each channel. There is also a clamping-to-ground circuitry, anti-leakage, an anti-memory effect block, a thermal sensor, and a HV receiver switch (HVR_SW), which guarantees a strong decoupling during the transmission phase.

Moreover, the STHV748 includes self-biasing and thermal shutdown blocks (see block diagram in Figure 1). Each channel can support up to five active output levels with two half bridges. The output stage of each channel is able to provide ±2 A peak output current. In order to reduce power dissipation during continuous wave mode, the peak current is limited to 0.6 A (a dedicated half bridge is used).

December 2010

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Contents	AN3240

Contents

1	STHV748 - pinout configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 5
2	STHV748 block diagram and truth table . . . . . . . . . . . . . . . . . . . . . . . . .		7
3	STHV748 PCB demo description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		9
4	PCB demo description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10
		4.0.1 Capacitances and resistances list . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
5	Operating supply conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		15
	5.1	Load selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
	5.2	Fixed STHV748 pins on PCB demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
6	Demonstration kit composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		18
	6.1	Method 1 (flexible - based on BNC PCB adapter) . . . . . . . . . . . . . . . . . .	18

6.1.1 How to drive the STHV748 for method 1 . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2 Method 2 (use of the motherboard based on the STM3210E-EVAL) . . . . 20

6.2.1	Motherboard communication setting . . . . . . . . . . . . . . . . . . . . . . . . . . .	21
6.2.2	Motherboard driving performance for the PCB demo . . . . . . . . . . . . . .	22
6.2.3	Turn on demo system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
6.2.4	Turn off demo system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
6.2.5	Acquisition examples of PW, CW and PC mode . . . . . . . . . . . . . . . . . .	27

6.3Method 3 (LabView interface - use of the HSDIO PCB connector) . . . . . 29

7

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31

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AN3240	List of tables

List of tables

Table 1. Pinout configuration table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Table 2. STHV748 truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Capacitances and resistances list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 4. C1 head connector pin vs STHV748 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 5. DC working supply conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 6. Current consumption in CW mode, @ 5 MHz, HVP/M1=±5 V, no-load . . . . . . . . . . . . . . . 15 Table 7. Power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 8. Special pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 9. STM3210E-EVAL pin configuration table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 10. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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List of figures	AN3240

List of figures

Figure 1. STHV748 single channel block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 2. PCB demo schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 3. PCB top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 4. C1 (CONN1) head connector description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 5. PCB demo image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 6. Load configuration schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 7. Demonstration kit composition (PCB demo plus BNC PCB adapter) . . . . . . . . . . . . . . . . . 18 Figure 8. PCB adapter image, top layout and top schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 9. Demonstration kit system image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 10. Inputs set of generators for PW mode (4 cycles - TX0 pulser Chx) . . . . . . . . . . . . . . . . . . 19 Figure 11. Diodes LED status on the PCB adapter which indicates IN4=1 and IN3=0 . . . . . . . . . . . . 20 Figure 12. Demonstration kit based on the STM3210E-EVAL system . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 13. Demonstration kit based on the STM3210E-EVAL system image . . . . . . . . . . . . . . . . . . . 21 Figure 14. STM3210E-EVAL pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 15. PW mode functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Figure 16. CW mode functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Figure 17. PC mode functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Figure 18. Supply connection for demonstration kit with the STM3210E-EVAL . . . . . . . . . . . . . . . . . 23 Figure 19. Main menu on STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 20. Main menu selection on the STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Figure 21. Example of “Continuous Mode” selection on the STM3210E-EVAL display. . . . . . . . . . . . 25 Figure 22. Exit the mode selected on the STM3210E-EVAL display. . . . . . . . . . . . . . . . . . . . . . . . . . 26 Figure 23. Reset key on the STM3210E-EVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Figure 24. PW mode (HVP0=60 V HVM0=-60 V 100 W//300 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 25. CW mode HVP1=5 V HVM1=-5 V 100 W//300 pF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 26. CW mode HVP1=10 V HVM1=-10 V 100 W//300 pF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 27. PC mode HVP0=60 V HVM0=-60 V 100 W//300 pF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 28. LabView equipment used to develop the STHV749 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Figure 29. STHV748 LabView PC control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 30. STHV748 demo system for LabView evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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AN3240	STHV748 - pinout configuration

1 STHV748 - pinout configuration

Table 1.	Pinout configuration table
	Pin number	Pin name
	1	AGND
	2	RIF_HVM1_1
	3	HVM1_A
	4	HVM0_A
	5	HVOUT_A
	6	HVP0_A
	7	RIF_HVP1_1
	8	HVP1_A
	9	HVP1_B
	10	RIF_HVP0_1
	11	HVP0_B
	12	HVOUT_B
	13	HVM0_B
	14	HVM1_B
	15	RIF_HVM0_1
	16	D_CTR
	17	IN4
	18	IN1_B
	19	IN2_B
	20	IN3_B
	21	VDDP_1
	22	GND_PWR_3
	23	XDCR_B
	24	LVOUT_B
	25	LVOUT_C
	26	XDCR_C
	27	GND_PWR_2
	28	VDDM_1
	29	IN3_C
	30	IN2_C
	31	IN1_C
	32	THSD

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STHV748 - pinout configuration				AN3240
	Table 1.	Pinout configuration table (continued)
		Pin number		Pin name
		33		AGND_1
		34		RIF_HVM1
		35		HVM1_C
		36		HVM0_C
		37		HVOUT_C
		38		HVP0_C
		39		RIF_HVP1
		40		HVP1_C
		41		HVP1_D
		42		RIF_HVP0
		43		HVP0_D
		44		HVOUT_D
		45		HVM0_D
		46		HVM1_D
		47		RIF_HVM0
		48		DGND
		49		DVDD
		50		IN1_D
		51		IN2_D
		52		IN3_D
		53		VDDP
		54		GND_PWR_1
		55		XDCR_D
		56		LVOUT_D
		57		LVOUT_A
		58		XDCR_A
		59		GND_PWR
		60		VDDM
		61		IN3_A
		62		IN2_A
		63		IN1_A
		64		EN

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AN3240	STHV748 block diagram and truth table

2 STHV748 block diagram and truth table

Figure 1. STHV748 single channel block diagram

Table 2.	STHV748 truth table
	Global			Per channel		State
THSD		IN4	IN3	IN2	IN1
1		x	x	0	0	Clamp
1		0	0	0	1	HVM0
1		0	0	1	0	HVP0
1		x	0	1	1	HVR_SW
1		0	1	0	1	HVM1
1		0	1	1	0	HVP1
1		0	1	1	1	HZ
1		1	1	1	1	HVR_SW
1		1	0	0	1	Max HVM0 & HVM1
1		1	0	1	0	Max HVP0 & HVP1
1		1	1	0	1	CW HVM1

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STHV748 block diagram and truth table								AN3240
	Table 2.	STHV748 truth table (continued)
		Global				Per channel		State
	THSD		IN4		IN3	IN2	IN1
	1		1		1	1	0	CW HVP1
	0		x		x	x	x	HZ

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AN3240	STHV748 PCB demo description

3 STHV748 PCB demo description

The STHV748 PCB demo can drive four transducers as 4-channel transmitters/receivers for ultrasound and other applications. The demo board consists of one STHV748 in a 64-lead 9x9x1 mm QFN package.

The STHV748 can deliver up to a ±2.0 A source and sink current to a capacitive transducer. It is designed for medical ultrasound imaging and ultrasound material NDT applications.

The STHV748 output waveforms can be displayed directly for each channel Ch A/B/C/D using an oscilloscope by connecting the scope probe to the J1, J2, J3, and J4 jumpers, moreover, the user can select whether or not to connect the onboard equivalent load, a 300 pF 200 V capacitor paralleled with a 100 Ω, 2 W resistor (or alternatively, 200 Ω//50 pF - 200 Ω//250 pF - no-load). A coaxial cable can also be used to easily connect the user transducer.

IN1/2/3/4, for each channel available in IC, is controlled via the 13 pins of the C1 (CONN1) head connector on the board (34 pins).

The main issues in this PCB design are the capacitance values, to ensure good filtering and an effective decoupling between the low voltage inputs (IN1, IN2, IN3, IN4, and EN for each channel) and the HV switching signals (XDCR, HVOUT, etc.,) which is ensured by the layer separation used.

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	PCB demo description	AN3240
	Figure 2. PCB demo schematic

	demo PCB
!-V	description