Monolithic Power Systems Inc. EV4835A-RD-00A

Overview

EV4835A-RD-00A from Monolithic Power Systems is an evaluation board for the MP4835AGRD 32-channel high-voltage analog switch IC, supporting ±90V analog signals and 14Ω typical on-resistance. It enables serial 32-bit shift register control (up to 80MHz at 5V VLL) and integrates bleed resistors on all SWout pins to prevent DC buildup across piezoelectric transducers. Designed specifically for medical ultrasound beamforming and industrial NDT systems.

For engineers reviewing the EV4835A-RD-00A datasheet, EV4835A-RD-00A pinout, EV4835A-RD-00A application, or EV4835A-RD-00A equivalent, this board provides verified hardware reference for MP4835AGRD integration, including header-based logic interface (CLK/DIN/DOUT/LE_BAR/MODE), dual-supply support (VDD=5V, VLL=2.7–5.5V), and 0805 capacitor pads for 330pF reference loading per channel.

Technical Context

The EV4835A-RD-00A implements a functional test platform for the MP4835AGRD QFN-72 IC, featuring level-shifted 32-bit serial control with latch enable (LE_BAR) and mode-selectable operation. All 32 analog switch channels are brought out to solder pads (C0–C31) and input headers (IN0–IN31), with integrated 4.7μF bypass capacitors on VDD/VLL rails.

It supports two independent power domains: VDD (5V) powers internal translators and switch drivers; VLL (2.7–5.5V) supplies logic interface circuitry. The board uses Molex 4-pin and 8-pin headers for external controller connection and includes no onboard voltage generation - all analog and logic supplies must be externally sourced.

Key Specifications

Availability

EV4835A-RD-00A is available at Aetrix Electronics and suitable for medical ultrasound imaging systems, industrial non-destructive testing (NDT) equipment, and high-voltage analog multiplexing development requiring stable component supply and validated reference hardware.

Supply support for EV4835A-RD-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 ICs, with design expertise in high-voltage analog, DC/DC conversion, and motor control solutions.

The EV4835A-RD-00A belongs to MPS's high-voltage analog switch evaluation platform family, developed to accelerate prototyping of time-critical, multi-channel ultrasound transmit/receive front-ends and NDT pulser-receiver modules.

FAQ

Does the EV4835A-RD-00A include the MP4835AGRD IC?

Yes. The board is populated with one MP4835AGRD QFN-72 IC (U1), as confirmed in the Bill of Materials on page 3 of the reference design document. No additional assembly or IC mounting is required to operate the evaluation functionality.

What voltage levels must be supplied externally to operate the board?

Two external DC supplies are mandatory: VDD = 5V (for internal translators and switch drivers) and VLL = 2.7–5.5V (for logic interface). These are connected via the 4-pin header (CN1); no onboard regulation or generation is provided.

How are the 32 analog switch channels accessed on the board?

All 32 channels are accessible through dedicated solder pads: IN0–IN31 (switch inputs) and C0–C31 (switch outputs with integrated 0805 footprint for 330pF reference capacitors). No connectors or edge fingers are used - direct soldering or probe contact is required.

Is there a clock frequency limit for reliable serial control?

Yes. Maximum clock frequency depends on VLL: up to 80MHz at VLL = 5.0V, and up to 40MHz at VLL = 3.3V, as specified in the MP4835A datasheet and confirmed in the EV4835A-RD-00A quick start guide.

Can the board be used without connecting external transducers or pulsers?

Yes. The board supports open-circuit validation: all INx and Cx pads are electrically isolated and accessible for bench testing with signal generators, oscilloscopes, or load resistors. Bleed resistors on SWout pins ensure safe DC bias conditions even with no transducer attached.

What is the purpose of the MODE pin?

The MODE pin selects between two operational modes defined in the MP4835A functional block diagram: Mode H enables latched output behavior after LE_BAR assertion; Mode L enables transparent output update synchronized to clock edges. Its state is set via the 8-pin header (CN2, pin 5).