Microchip Technology MD1730-V/M2

Overview

MD1730-V/M2 from Microchip Technology is an 8-channel ultra-low phase noise continuous waveform (CW) transmitter with integrated digital beamformer, designed for medical ultrasound Doppler systems. It delivers ±1V to ±6V_p-p CW output swing, -160 dBc/Hz phase noise at 1 kHz offset and 5 MHz, 8-bit per-channel programmable phase delay, and supports up to 250 MHz LVDS/SSTL clock input. It enables high-resolution cardiovascular imaging and fetal heart monitoring.

For engineers reviewing the MD1730-V/M2 datasheet, MD1730-V/M2 pinout, MD1730-V/M2 application, or MD1730-V/M2 equivalent, key selection criteria include CW output voltage range, phase noise performance at Doppler frequencies, SPI-controlled beamforming resolution, clock buffer enable flexibility, and thermal pad–based thermal management in compact VQFN packaging.

Technical Context

The MD1730-V/M2 implements a dedicated low-noise analog output path with matched PFET/NFET output stages (R_ON = 7.5 Ω / 6.5 Ω typ), dual independent 2.5V single-ended clock buffers (CKB0/CKB1) with 40–250 MHz output range, and a high-speed 200 MHz SPI interface supporting daisy-chain and broadcast modes. Its phase delay resolution is 1 clock cycle (e.g., 6.25 ns at 160 MHz input), enabling 11.25° angular beam steering resolution.

Operation requires five distinct supply rails: +2.5V (VLL), +5V (VDD), +10V (VGP), -10V (VGN), and programmable ±1V to ±6V CW supplies (VCW+/VCW−). The EN pin controls core logic and regulators but not clock buffers, which are independently enabled via CBE0/CBE1 pins - enabling asynchronous clock distribution control.

Key Specifications

Pinout & Package

MD1730-V/M2 uses a 36-lead 6×6×0.9 mm VQFN package with exposed thermal pad (EP) that must be connected to GND for thermal and electrical integrity. Pin numbering follows standard top-down, counter-clockwise layout starting from top-left corner (Pin 1 = EN).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CW transmitter applications.

Compared with AFE5809 and AD9106, MD1730-V/M2 provides dedicated, hardware-accelerated CW beamforming with industry-leading phase noise and zero-software latency - making it the optimal choice for high-performance medical Doppler transmitters where spectral purity and timing determinism are critical.

Availability

MD1730-V/M2 is available at Aetrix Electronics and suitable for cardiovascular ultrasound imaging, fetal Doppler monitoring, and industrial flow metering requiring stable component supply, long-term lifecycle support, and traceable sourcing for Class II medical device manufacturing.

Supply support for MD1730-V/M2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and timing solutions, serving automotive, industrial, medical, and communications markets with ISO 9001-certified manufacturing and global distribution.

The MD1730-V/M2 belongs to Microchip's medical ultrasound analog front-end product line, engineered specifically for high-fidelity continuous-wave Doppler transmission with ultra-low phase noise, integrated beamforming, and robust multi-rail power management.

FAQ

What is the maximum clock frequency supported by MD1730-V/M2 for CW output generation?

The MD1730-V/M2 accepts input clock frequencies from 40 MHz to 250 MHz on its CLKP/CLKN pins. When using the internal frequency divider (CWFD[7:0]), the resulting CW output frequency ranges from f_CLK/512 to f_CLK/2 - enabling precise 5 MHz CW output from a 160 MHz clock, as validated in DS20005586B. This range ensures compatibility with common FPGA and ASIC clock sources in ultrasound systems.

How does the MD1730-V/M2 achieve -160 dBc/Hz phase noise at 5 MHz?

The MD1730-V/M2 achieves -160 dBc/Hz phase noise through a dedicated low-noise analog output path featuring matched PFET/NFET output stages (R_ON = 7.5 Ω / 6.5 Ω typ), isolated multi-rail supplies (VGP/VGN/VCW±), and minimized signal path parasitics in the 6×6 mm VQFN package. This architecture is validated in Figure 2-13 of the DS20005586B datasheet under 5 MHz CW operation at 1 kHz offset.

Can MD1730-V/M2 drive piezoelectric transducers directly without external HV amplifiers?

Yes - the MD1730-V/M2 supports ±1V to ±6V_p-p CW output swing and ±300 mA peak output current per channel, enabling direct drive of typical 50–200 Ω piezoelectric transducers used in portable and handheld ultrasound systems. Its low R_ON output stage (7.5 Ω typ) minimizes voltage droop under load, as confirmed in Table 1-4 of DS20005586B.

What is the function of the CBE0 and CBE1 pins on MD1730-V/M2?

CBE0 and CBE1 are independent enable inputs for the two integrated 2.5V single-ended clock buffers (CKB0 and CKB1). When CBE_n = 0, the corresponding buffer is disabled; when high, it outputs a buffered version of the internal clock. This allows asynchronous control of auxiliary clock distribution - for example, enabling CKB0 to drive an HV pulser while keeping CKB1 disabled to reduce power - without affecting MD1730-V/M2 core operation.

Does MD1730-V/M2 support daisy-chaining multiple devices for synchronized beamforming?

Yes - the MD1730-V/M2 supports both daisy-chain and broadcast SPI modes. In daisy-chain mode (SPIB = 0), SDI of Device 1 connects to SDO of Device 2, enabling sequential register access. In broadcast mode (SPIB = 1), a single SPI transaction writes identical values to the same register across all daisy-chained MD1730-V/M2 devices - essential for synchronized phase delay updates across large transducer arrays.