Monolithic Power Systems Inc. EV4865A-BD-00A

Overview

EV4865A-BD-00A from Monolithic Power Systems is an evaluation board for the MP4865AGBD - a 64-channel, ±90V analog switch in BGA-144 (10mm×10mm) packaging, designed specifically for medical ultrasound beamforming and industrial NDT systems. It supports serial 64-bit shift register control (CLK/DIN/LE_BAR/DOUT), integrates bleed resistors to prevent DC buildup across PZT elements, and operates with dual low-voltage supplies (VLL: 2.7–5.5V; VDD: 4.5–5.5V).

For engineers reviewing the EV4865A-BD-00A datasheet, EV4865A-BD-00A pinout, EV4865A-BD-00A application, or EV4865A-BD-00A equivalent, this board enables rapid validation of high-voltage analog switching performance, timing synchronization across 64 channels, load capacitance effects on pulse fidelity, and serial interface robustness under pulsed ultrasound conditions.

Technical Context

The EV4865A-BD-00A implements direct access to all 64 SWIN/SWOUT signal paths of the MP4865AGBD IC, with dedicated pads (IN0–IN63, C0–C63) for connecting pulsers and piezoelectric transducers. It provides on-board 4.7µF decoupling capacitors at VDD and VLL rails and includes a 10kΩ pull-up resistor for LE_BAR.

Control logic uses a synchronous 64-bit serial shift register: DIN feeds bitstream on CLK rising edge; LE_BAR latches register contents to update switch states; DOUT enables daisy-chaining. The board accepts external clock frequencies up to 60MHz (at VLL = 5.0V) and routes all four control signals via a 12-pin header (CN1).

Key Specifications

Availability

EV4865A-BD-00A is available at Aetrix Electronics and suitable for medical ultrasound development, industrial non-destructive testing (NDT) system prototyping, and high-voltage analog multiplexer validation requiring stable component supply and documented reference design traceability.

Supply support for EV4865A-BD-00A 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management and analog solutions, with design centers across Asia and North America.

The EV4865A-BD-00A belongs to MPS's high-voltage analog switch evaluation platform family, engineered to accelerate time-to-test for ultrasound front-end ICs used in portable and cart-based imaging systems.

FAQ

What voltage levels can the EV4865A-BD-00A safely handle on its analog signal paths?

The board itself does not generate high voltage but routes ±90V analog signals through the MP4865AGBD IC. Its PCB layout maintains ≥0.3mm creepage/clearance between high-voltage traces and low-voltage control nets, and all SWIN/SWOUT pads are rated for 180V peak-to-peak operation per the IC's absolute maximum ratings.

Can the EV4865A-BD-00A be used without soldering external components?

Yes - the board is fully populated with C1/C2 decoupling caps, R1 pull-up, JP1 jumper, and U1 (MP4865AGBD). Only external connections required are VLL, VDD, CLK, DIN, LE_BAR, DOUT, ground, and analog signal sources/loads to the designated pads.

Does the board support daisy-chaining multiple MP4865AGBD devices?

Yes - DOUT is routed to a dedicated pad and matches the MP4865AGBD's open-drain output specification. When cascading, the DOUT of one board connects to DIN of the next, enabling synchronized 128+ channel control using a single 64-bit shift register chain.

What is the purpose of the C0–C63 pads labeled "Optional Load Capacitor"?

These 0805 footprints allow placement of 330pF ceramic capacitors to emulate typical PZT transducer capacitance (≈200–500pF). This enables repeatable measurement of switch settling time, charge injection, and transient response without requiring physical transducers during early-stage validation.

Is the EV4865A-BD-00A RoHS-compliant and lead-free?

Yes - all components on the board, including the MP4865AGBD IC, are lead-free, halogen-free, and compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status for this part on its official Quality Assurance portal.

How is timing synchronization achieved across all 64 channels?

Synchronization is enforced by the LE_BAR signal: after shifting 64 bits into the internal register via DIN/CLK, a falling edge on LE_BAR simultaneously updates all 64 switch states. Propagation delay from LE_BAR to final SWOUT transition is ≤25ns (typical), ensuring sub-40ns inter-channel skew.