Analog Devices Inc./Maxim Integrated MAX14866UWZ+

Overview

The MAX14866UWZ+ from Maxim Integrated is a 16-channel, high-voltage (±110V), analog SPST switch designed for ultrasound transmit/receive multiplexing. It operates from a single +5V supply (VCC) and 1.7V–5.5V logic supply (VDD), delivers 7Ω typical R_ON, <100pC charge injection, and supports up to 210V_PKPK linear input range - enabling compact, safe in-probe HV signal routing without external HV supplies.

For engineers reviewing the MAX14866UWZ+ datasheet, MAX14866UWZ+ pinout, MAX14866UWZ+ application, or MAX14866UWZ+ equivalent, key selection criteria include its SOI-based latchup-free architecture, 50MHz large-signal bandwidth, SPI-controlled per-channel switching (up to 30MHz), and wafer-level package (5.53 × 5.47 mm) optimized for space-constrained medical transducer assemblies.

Technical Context

The MAX14866UWZ+ integrates 16 independent analog switches built on Silicon-on-Insulator (SOI) technology, eliminating latchup risk during ultrasound load resonances and enabling robust ±110V COM/NO voltage handling. Its flat R_ON profile across the full ±105V dynamic range ensures harmonic imaging fidelity.

Control is implemented via a 16-bit SPI shift register with transparent latch (LE), supporting daisy-chained configurations, plus asynchronous SET/CLR inputs for global bank control. Transmit detection circuitry inhibits SPI writes during HV bursts (>±2V), preventing noise-induced misconfiguration.

Key Specifications

Pinout & Package

The MAX14866UWZ+ is packaged in a 110-bump wafer-level package (WLP), measuring 5.53 mm × 5.47 mm with an exposed thermal pad. This ultra-compact footprint achieves <1.9 mm²/channel density - critical for integration into ultrasound probe heads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage analog switch applications.

Compared with MAX14866UWZ+, the MAX14867UWZ+ adds per-channel DACs for calibration but increases cost and layout complexity, while the TMUX136EWR lacks SOI robustness and demands external HV rails - making MAX14866UWZ+ the optimal choice for space-, safety-, and performance-critical ultrasound probe designs.

Availability

The MAX14866UWZ+ is available at Aetrix Electronics and suitable for medical ultrasound imaging, non-destructive testing (NDT), and industrial ultrasonic sensing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for FDA-regulated designs.

Supply support for MAX14866UWZ+ 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX14866UWZ+ belongs to Maxim's high-voltage ultrasound interface product line, engineered specifically to replace discrete HV solutions in medical transducers - prioritizing SOI reliability, ultra-low charge injection, and wafer-level miniaturization.

FAQ

What is the maximum allowable voltage across COM and NO pins for the MAX14866UWZ+?

The MAX14866UWZ+ supports a maximum differential voltage of ±110V between any COM_x and NO_x pin, with absolute ratings of −110V to +110V referenced to GND for both terminals. Exceeding this violates absolute maximum ratings and risks permanent damage. The linear input range is specified up to ±105V for AC operation above 500kHz, and the device is rated for 210V_PKPK bipolar transmit signals under proper biasing conditions.

Can the MAX14866UWZ+ operate from a single 5V supply, or are separate VCC and VDD supplies required?

The MAX14866UWZ+ can operate from a single +5V supply: VCC = +5V powers the HV switch core, and VDD = +5V powers the digital interface (SPI, SET/CLR). Since VDD accepts 1.7V–5.5V, tying VDD to VCC is fully supported and commonly implemented to simplify power design - especially in space-constrained probe head layouts where minimizing supply rails is critical.

Does the MAX14866UWZ+ support daisy-chaining multiple devices, and how is it implemented?

Yes, the MAX14866UWZ+ supports daisy-chaining via its DOUT pin, which outputs the DIN data delayed by 16 clock cycles. To chain N devices, connect DOUT of device N−1 to DIN of device N, while sharing CLK, LE, SET, and CLR across all devices. After shifting 16×N bits, pulsing LE low simultaneously updates all devices - enabling synchronized channel control across large transducer arrays without additional GPIO overhead.

What is the purpose of the integrated bleed resistors in the MAX14866UWZ+, and how do they function?

The MAX14866UWZ+ integrates on-die bleed resistors that automatically discharge transducer capacitance after HV transmission. When a switch is OFF, these resistors provide a controlled discharge path (typically ~80kΩ) from NO to GND, preventing residual voltage buildup that could distort subsequent echo signals or cause image artifacts. This eliminates the need for external bleeder networks and improves system stability in repetitive-pulse ultrasound modes like elastography.

Is the MAX14866UWZ+ pin-compatible with other members of the MAX14866 family, such as the TQFN variant?

No, the MAX14866UWZ+ (WLP) is not pin-compatible with the 48-pin TQFN variant (e.g., MAX14866ATJ+). The WLP uses a 110-bump array with different bump pitch, signal assignment, and thermal pad layout. While both share identical electrical functionality and SPI protocol, PCB layout, decoupling, and assembly processes differ significantly - requiring separate footprints and requalification for each package type.