Analog Devices Inc./Maxim Integrated MAX14803CXB+T

Overview

The MAX14803CXB+T from Maxim Integrated is a 16-channel, high-voltage analog SPST switch IC designed for ultrasound imaging probe and industrial printer signal routing. It delivers low-charge-injection (350–820 pC), 16-bit serial-controlled switching with ±100V/0V to +200V/−100V flexible HV supply operation, 20 MHz analog bandwidth, and integrated 35 kΩ bleed resistors on all COM/NO terminals. It operates in commercial temperature range (0°C to +70°C) in a 48-pin LQFP package.

For engineers reviewing the MAX14803CXB+T datasheet, MAX14803CXB+T pinout, MAX14803CXB+T application, or MAX14803CXB+T equivalent, key selection criteria include its 16-channel independent control, −77 dB off-isolation at 5 MHz, 22–48 Ω on-resistance (dependent on VPP/VNN), 20 MHz serial interface timing, and integrated overvoltage clamping diodes at COM pins - all critical for high-fidelity ultrasonic transmit/receive path management.

Technical Context

The MAX14803CXB+T implements a 16-bit serial shift register with transparent latch, enabling daisy-chainable configuration via DIN/CLK/LE/CLR/DOUT logic interface operating from a separate +2.7V to +5.5V VDD supply. Its HVCMOS process supports peak analog signal ranges from VNN to min(VNN + 200V, VPP − 10V), with power-on reset ensuring all switches default open.

Each channel features individually programmable SPST topology with integrated clamping diodes (on COM terminals) for positive overshoot protection and 35 kΩ bleed resistors (MAX14803-specific) to discharge piezoelectric transducer capacitance. Switching dynamics include 2–3.5 µs turn-on/off times and 50 kHz max switching frequency under full-load conditions.

Key Specifications

Pinout & Package

Package: 48-pin LQFP (7 mm × 7 mm), RoHS-compliant, thermal resistance θ_JA = 44°C/W (four-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX14802CCM+, the MAX14803CXB+T adds integrated bleed resistors without changing pinout or logic interface - simplifying design for transducer-based systems. Compared with MAX14803AEWZ+, it trades miniaturization and extended temperature for easier assembly and higher thermal dissipation (θ_JA = 44°C/W vs. 27°C/W).

Availability

MAX14803CXB+T is available at Aetrix Electronics and suitable for ultrasound imaging systems, industrial printer controllers, and medical beamformer modules requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for MAX14803CXB+T 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) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for medical, industrial, and communications markets.

The MAX1480x family targets high-voltage analog switching in demanding signal-path applications - specifically engineered for low-charge-injection, high off-isolation, and robust overvoltage protection in ultrasound and industrial actuation systems.

FAQ

What is the maximum allowable voltage difference between VPP and VNN for the MAX14803CXB+T?

The MAX14803CXB+T supports a maximum VPP − VNN differential of 250 V. Absolute maximum ratings specify VPP up to +220 V and VNN down to −220 V, but the combined differential must not exceed 250 V. This enables configurations such as +100 V/−100 V, +200 V/0 V, or +40 V/−160 V - all validated in the datasheet's Electrical Characteristics table.

Does the MAX14803CXB+T include integrated bleed resistors, and what is their value?

Yes, the MAX14803CXB+T includes integrated 35 kΩ bleed resistors on each COM and NO terminal - a distinguishing feature versus the MAX14802 series. These resistors discharge capacitive loads (e.g., piezoelectric transducers) automatically, eliminating the need for external bleeder networks and reducing system-level component count.

What is the guaranteed off-isolation performance of the MAX14803CXB+T at 5 MHz?

The MAX14803CXB+T guarantees −77 dB off-isolation at 5 MHz with a 50 Ω load, as specified in the Electrical Characteristics table. This value is measured under standard test conditions (VPP = +100 V, VNN = −100 V, TA = +25°C) and reflects strong channel-to-channel signal rejection essential for high-resolution ultrasound imaging.

Can multiple MAX14803CXB+T devices be daisy-chained, and how is this implemented?

Yes, the MAX14803CXB+T supports daisy-chaining via its DOUT pin, which outputs shifted data delayed by 16 clock cycles. To chain devices, connect DOUT of one IC to DIN of the next, while sharing CLK, LE, and CLR lines. Pulse LE low after loading all shift registers to simultaneously update all 16-channel banks - enabling scalable channel expansion without additional GPIOs.

What is the on-resistance range of the MAX14803CXB+T, and how does it vary with supply voltage?

The MAX14803CXB+T exhibits an on-resistance range of 22–48 Ω depending on VPP/VNN configuration and load current. At +100 V/−100 V and 5 mA, R_ON is 22–30 Ω (typ/max); at +40 V/−160 V, it rises to 26–48 Ω. This variation is documented in the Electrical Characteristics table and directly impacts insertion loss in high-frequency analog paths.