Analog Devices Inc./Maxim Integrated MAX4800CTM+T

Overview

The MAX4800CTM+T from Maxim Integrated is an 8-channel, high-voltage SPST analog switch IC designed for ultrasonic imaging transducer multiplexing and industrial printer head control. It delivers low-charge-injection (350pC), 22Ω on-resistance, DC–10MHz signal bandwidth, and operates with VPP/VNN supplies up to +100V/−100V. Its serial digital interface enables precise channel selection in medical ultrasound beamforming systems.

For engineers reviewing the MAX4800CTM+T datasheet, MAX4800CTM+T pinout, MAX4800CTM+T application, or MAX4800CTM+T equivalent, this page provides verified specifications, package mapping to 48-pin TQFP, confirmed pin functions, real-world use cases in ultrasound and printing, and two validated drop-in alternatives - all extracted from Maxim's official Rev 2 datasheet (19-0631).

Technical Context

The MAX4800CTM+T integrates eight independent BCDMOS-based SPST switches controlled via an 8-bit serial shift register with latch enable (LE) and clear (CLR) inputs. It features power-on reset that forces all switches open at startup, ensuring safe initialization in high-voltage systems.

Digital inputs (DIN, CLK, LE, CLR) tolerate up to +13.2V regardless of VDD (2.7V–13.2V), enabling direct interfacing with higher-voltage microcontrollers. The device supports daisy-chaining via DOUT and maintains −77dB off-isolation at 5MHz with 4–18pF off-capacitance per switch terminal.

Key Specifications

Pinout & Package

The MAX4800CTM+T is packaged in a 48-pin TQFP (7mm × 7mm, RoHS-compliant), pin-compatible with Supertex HV20220FG. All analog terminals (COM0–COM7, NO0–NO7) are isolated from digital logic; VPP, VNN, GND, VDD, and serial interface pins are assigned per Maxim's official pinout diagram (Rev 2, p.14).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HV20220FG, MAX4800CTM+T provides assured supply continuity and full documentation; compared with MAX4802CCM+, it omits bleed resistors to reduce component count and cost where external discharge is already implemented.

Availability

MAX4800CTM+T is available at Aetrix Electronics and suitable for ultrasound imaging systems, industrial printers, and high-voltage test equipment requiring stable component supply across multi-year production cycles.

Supply support for MAX4800CTM+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) is a semiconductor company specializing in precision analog, mixed-signal, and high-voltage interface ICs for industrial, medical, and communications markets.

The MAX4800 family was engineered specifically for high-reliability, multi-channel high-voltage switching in medical ultrasound and industrial print systems-emphasizing low charge injection, robust isolation, and seamless controller integration.

FAQ

What is the maximum allowable VPP–VNN voltage difference for MAX4800CTM+T?

The MAX4800CTM+T supports a maximum VPP–VNN differential of 200V. Valid configurations include +100V/−100V, +185V/−15V, and +40V/−160V. Exceeding 200V violates absolute maximum ratings and may cause permanent damage. The device does not require symmetrical supplies, but VPP must remain ≤ VNN + 200V per datasheet Section "Absolute Maximum Ratings".

Does MAX4800CTM+T include integrated bleed resistors like MAX4802?

No, MAX4800CTM+T does not include integrated bleed resistors. Only the MAX4802 variant features 35kΩ resistors tied to RGND on each COM and NO terminal. MAX4800CTM+T requires external discharge paths for capacitive loads such as piezoelectric transducers. This distinction is explicitly stated in the "Features" and "Detailed Description" sections of the MAX4800/MAX4801/MAX4802 datasheet (Rev 2, pp.1, 9).

Can MAX4800CTM+T be daisy-chained with other MAX4800-series devices?

Yes, MAX4800CTM+T supports daisy-chaining via its DOUT pin, which outputs shifted data delayed by eight clock cycles. Connect DOUT of one device to DIN of the next, while sharing CLK, LE, and CLR lines. A single LE pulse updates all chained devices simultaneously, enabling synchronized switching across multiple 8-channel banks in large-scale ultrasound arrays.

What is the purpose of the power-on reset function in MAX4800CTM+T?

The power-on reset function in MAX4800CTM+T ensures all eight analog switches default to the OPEN (OFF) state at power-up, regardless of shift register content. This prevents unintended high-voltage conduction during system initialization-a critical safety feature in medical ultrasound and industrial equipment where uncontrolled HV paths could damage transducers or endanger operators.

Is MAX4800CTM+T compatible with 3.3V microcontrollers without level shifting?

Yes, MAX4800CTM+T accepts 3.3V logic levels directly. Its digital inputs (DIN, CLK, LE, CLR) are +13.2V tolerant and operate with VDD as low as +2.7V. When VDD = 3.3V, VIH(min) = VDD − 0.75V = 2.55V and VIL(max) = 0.75V - fully compatible with standard 3.3V CMOS outputs. No external level shifters are needed, simplifying interface design.