Analog Devices Inc./Maxim Integrated MAX4968CCM+T

Overview

MAX4968CCM+T from Maxim Integrated is a 16-channel, high-linearity, bidirectional SPST analog switch with 18Ω typical on-resistance, ±100V negative supply (VNN), +10V positive supply (VPP), and DC-to-30MHz small-signal analog bandwidth - designed for medical ultrasound probe switching where high-voltage analog signal routing must be controlled by low-voltage logic.

For engineers reviewing the MAX4968CCM+T datasheet, MAX4968CCM+T pinout, MAX4968CCM+T application, or MAX4968CCM+T equivalent, key selection considerations include its 210V_P-P analog input range, integrated daisy-chainable 25MHz serial interface, -80dB off-isolation at 5MHz, and compatibility with ultrasound transmit/receive timing constraints requiring fast turn-on/turn-off (<5µs) and low charge injection (150pC).

Technical Context

The MAX4968CCM+T implements HVCMOS process technology to integrate high-voltage bilateral MOS switches with low-power CMOS logic control, enabling efficient high-voltage analog signal routing without dedicated >+100V supplies. Its 16-bit serial shift register supports daisy-chaining and latch-enable synchronization for deterministic switch state updates.

Each channel features matched on-resistance (±3% matching), flat R_ON across the full input range, and low parasitic capacitance (9pF off, 13pF on) to preserve signal integrity in wideband ultrasound burst transmission. The device operates with independent VDD (+2.37V to +5.5V), VPP (+9.5V to +10.5V), and VNN (-160V to 0V) rails, with no strict supply sequencing required.

Key Specifications

Pinout & Package

MAX4968CCM+T is housed in a 48-pin LQFP (7mm × 7mm) package with exposed pad. Power pins (VNN, VPP, VDD, GND) are distributed for low-inductance bypassing; all 16 analog switch terminals (SW0A/SW0B through SW15A/SW15B) are arranged in dual-row pairs for symmetrical PCB layout; digital control (DIN, CLK, LE, CLR, DOUT) is grouped for noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX14802 and HV2601, the MAX4968CCM+T delivers lower on-resistance, eliminates +100V supply dependency, and adds daisy-chainable serial control - reducing system-level power design effort, PCB area, and firmware complexity in scalable ultrasound platforms.

Availability

MAX4968CCM+T is available at Aetrix Electronics and suitable for medical ultrasound imaging, nondestructive testing (NDT), and high-voltage printer head control requiring stable component supply across long product lifecycles and regulatory-compliant manufacturing.

Supply support for MAX4968CCM+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 high-performance analog, mixed-signal, and power management ICs for demanding applications including medical, industrial, and communications systems.

The MAX4968 series belongs to Maxim's high-voltage analog switch product line, engineered specifically for ultrasound and NDT systems needing reliable, low-distortion switching of ±100V signals under tight timing constraints and stringent EMI requirements.

FAQ

What is the maximum analog signal voltage the MAX4968CCM+T can handle?

The MAX4968CCM+T supports an analog dynamic signal range from VNN to VNN + 210V, enabling ±105V peak-to-peak operation. With VNN = -100V, this allows signals from -100V to +110V - sufficient for standard medical ultrasound transmit bursts. Absolute maximum ratings specify VNN down to -160V and VPP up to +12V, but operational limits must stay within the 210V_P-P envelope to maintain linearity and reliability.

Does the MAX4968CCM+T include integrated bleed resistors like the MAX4968A?

No, the MAX4968CCM+T does not include integrated bleed resistors. Bleed resistors (40kΩ typical) are exclusive to the MAX4968A variant. The MAX4968CCM+T is functionally identical to the base MAX4968, offering the same 16-channel SPST switching, serial interface, and electrical specs - but without the shunt resistors on SWx terminals needed for passive capacitive load discharge in piezoelectric transducer applications.

Can multiple MAX4968CCM+T devices be connected in series for expanded channel count?

Yes, the MAX4968CCM+T supports daisy-chaining via its DOUT pin, which outputs shifted data after 16 clock cycles. By connecting DOUT of one device to DIN of the next, and sharing CLK, LE, and CLR lines, up to 16 devices (256 channels) can be controlled with a single 3-wire serial interface. LE must be pulsed low simultaneously to update all latches, ensuring synchronized switching across the chain.

What is the recommended power supply sequencing for the MAX4968CCM+T?

No strict supply sequencing is required for the MAX4968CCM+T. VDD, VPP, and VNN may power up in any order. However, LE must be held low during power-up to ensure proper initialization. All supplies should be bypassed with ≥0.1µF ceramic capacitors placed close to their respective pins. The internal power-on-reset circuit guarantees all switches start in the open (off) state regardless of supply ramp timing.

How does the MAX4968CCM+T achieve low distortion in ultrasound applications?

The MAX4968CCM+T achieves low distortion through three key design features: 18Ω typical on-resistance with <2% flatness across the full 210V_P-P range preserves signal amplitude linearity; low charge injection (150pC) minimizes DC offset in receive paths; and -45dB 2nd-harmonic distortion at 2MHz ±90V pulse ensures clean transmit waveform fidelity critical for harmonic imaging modes.