Supertex inc. MD2134 High Speed Ultrasound Beamforming Source Driver Features General Description Multiple-level ultrasound pulser The MD2134 is a high-speed source driver for use in a pulsed current waveform generator. This programmable, fast, arbitrary Fast switching current source for push-pull topology current level driver is designed for medical ultrasound imaging 250MHz maximum frequency, 4.0ns input to output beamforming applications. It also can be used in HIFU, NDT delay ultrasound and other instrument applications. 15 independent programmable output level registers Pulse amplitude modulation (PAM) with 8-bit resolution The MD2134 consists of CMOS digital logic input circuits, an 8-bit apodization DAC for peak output current via SPI eight-bit current DAC for aperture weighting amplitude control, and a programmable 15-level pulse amplitude modulation (PAM) Very low second order harmonic distortion current-source that does not include a zero level. The fast current Picoseconds time-jitter from input to output sources are constructed with current-switch array, controlled by Fast SPI write and read-back of level & DAC registers the LV0~LV15 level-register as the waveform data points. Four +5.0V power supply, 2.5V CMOS logic interface logic inputs M 3:0 are used for transmit data level selecting, as Drives DN2625 MOSFETs output up to 230V P-P well as the transmitting timing control pins. Each level can be Programmable aperture windowing programmed to a resolution of +/-127 including zero (8-bit) in addition to an 8-bit SPI apodization DAC. The outputs PA and PB are controlled by M 3:0 pins directly, as well as the polarity-flip bit Applications S1 in the SPI register. The high-speed SPI interface will achieve Medical imaging ultrasound beamforming transmitter per-scan-line fast data updating for dynamically changing delay Dynamic focusing B-scan CW PW Doppler & FM chirp time, weighting and waveforms. Ultrasonic phase array focusing transmitter Piezoelectric & MEMS transducer waveform drivers The MD2134 outputs are designed to drive two very low-threshold, High speed arbitrary waveform generator high-voltage depletion N-MOSFETs, such as Supertexs DN2625s, as source drivers. The two DN2625 drains are connected to a High resolution NDT phase array ultrasound pulser center-tap RF pulse transformer. The transformers secondary output connects to a cable and piezoelectric or capacitive transducer as a load with a good impedance match. Block Diagram +2.5V +5.0V +5.0V +3.3V VLL VDD C3A C2A KA C1A D1 A M0 PA PAM M1 M1 Level DN2625 T1 M2 Level Select Translator M3 +70 to 100V B V Beamform PP XDRC GND Switch Matrix EN Data SDI SUB Latch SDO & DAC PB DN2625 SCK Control M2 Logic CS LD D2 DGND AGND VREF RFB C3B C2B KB C1B +5.0V +3.3V +V REF Doc. DSFP-MD2134 Supertex inc. C102412 www.supertex.comMD2134 Pin Configuration Ordering Information 40 Part Number Package Packing 1 MD2134K7-G 40-Lead (5x5) QFN 490/ Tray 40-Lead QFN (K7) (top view) Absolute Maximum Ratings Package Marking Parameter Value L = Lot Number V , Logic supply -0.5V to +3.5V LL YY = Year Sealed MD2134 WW = Week Sealed LLLLLL V , Positive supply -0.5V to +6V DD A = Assembler ID YYWW AAACCC C = Country of Origin V , V Driver outputs -0.5V to +6V PA PB = Green Packaging V , Ground 0V SUB Package may or may not include the following marks: Si or 40-Lead QFN (K7) Operating temperature 0C to +70C Storage temperature -65C to +150C Typical Thermal Resistance Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation Package ja of the device at the absolute rating level may affect device reliability. All voltages are O referenced to device ground. 40-Lead QFN 26 C/W Operating Supply Voltages (Over operating conditions unless otherwise specified, V = +2.5V, V = +5V, V = 2.5V, R = 71.1k, T = 25C, DAC = 0) LL DD REF FB A Sym Parameter Min Typ Max Units Conditions V Logic supply 2.25 - 2.75 V LL T = 0 to 70C A V Power supply 4.75 5.0 5.25 V DD I V supply current EN = 0 - 0.1 1.0 LLQ LL A Standby condition I V supply current EN = 0 - 0.2 1.0 DDQ DD I V supply current EN = 1 - 5.0 20 A LLEN LL f = 0, all logic input, no transit SCK I V supply current EN = 1 - 5.0 12 mA DDEN DD I V supply current EN = 1 - 1.0 3.0 mA f = 50MHz, CW, M 0:3 = 0 LL50 LL SCK I V supply current EN = 1 - 40 85 mA f = 0 , Input = 50MHz, CW DD50 DD SCK Output Characteristics (Over operating conditions unless otherwise specified, V = +2.5V, V = +5V, V = 2.5V, R = 71.1k, T = 25C) LL DD REF FB A Sym Parameter Min Typ Max Units Conditions I Full scale output peak current 2.88 - 3.52 A DAC = 255, Level = 127 MAX-A/B I Output current offset - 0.5 2.0 mA DAC = 0 OO-A/B 5.3 5.8 - I = 1.0A PA/B Output voltage range, 5.0 5.5 - I = 1.5A PA/B +10% of I PA/B 4.5 5.0 - I = 3.0A PA/B V V PA/B - 1.0 1.5 I = 1.0A PA/B Output voltage range, - 1.2 1.7 I = 1.5A PA/B -10% of I PA/B - 1.8 2.3 I = 3.0A PA/B Doc. DSFP-MD2134 Supertex inc. C102412 www.supertex.com 2