Analog Devices Inc./Maxim Integrated MAX31D80T-003+

Overview

MAX31D80T-003+ from Maxim Integrated is a down-dithered spread-spectrum clock generator IC with factory-programmed 12MHz input and 12MHz output, 25kHz dither rate, 3.3V supply, -40°C to +125°C automotive temperature range, and 10-pin TDFN-EP package. It serves as an EMI-reduction timing source in noise-sensitive automotive infotainment systems.

For engineers reviewing the MAX31D80T-003+ datasheet, MAX31D80T-003+ pinout, MAX31D80T-003+ application, or MAX31D80T-003+ equivalent, key selection criteria include confirmed down-dither spread-spectrum capability, factory-set 12MHz output frequency, 25kHz dither rate accuracy, automotive-grade thermal performance, and TDFN-EP package compatibility with high-density PCB layouts.

Technical Context

The MAX31D80T-003+ integrates a PLL-based clock synthesis architecture optimized for electromagnetic interference (EMI) reduction via deterministic down-dither modulation. Its internal oscillator accepts only a 12MHz crystal (per Selector Guide), not a clock signal, and generates a precisely matched 12MHz spread-spectrum output with ±4% dither rate tolerance.

Unlike center-dither variants, this device implements fixed-magnitude down-dither (–0.25% to –3.0%) selected by SMSEL0/SMSEL1 logic states; the MAX31D80T-003+ is factory-configured for 25kHz dither rate and cannot be reprogrammed in-system. Power-up time is 1ms, and cycle-to-cycle jitter is ≤75ps at 100MHz - though its nominal 12MHz operation yields lower jitter in practice.

Key Specifications

Pinout & Package

MAX31D80T-003+ uses a 10-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed thermal pad (EP) requiring GND connection. Pin 1 is X1 (crystal drive input); pins 2 and 9 are SMSEL0/SMSEL1 (dither magnitude select); pins 3 and 8 are VCC; pins 4 and 7 are GND; pin 5 is CLKOUT (12MHz spread-spectrum output); pin 6 is XOUT (buffered 12MHz crystal output); pin 10 is X2 (crystal drive output).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar spread-spectrum clock generator applications.

Compared with Si5351A-B-GM and ICS843002AGI-01LFT, the MAX31D80T-003+ delivers plug-and-play 12MHz down-dither operation in the smallest footprint, with guaranteed automotive qualification and zero configuration - ideal for cost- and space-constrained EMI-critical designs.

Availability

MAX31D80T-003+ is available at Aetrix Electronics and suitable for automotive infotainment, industrial HMI, medical display, and avionics cabin systems requiring stable component supply with full RoHS compliance and traceable lot data.

Supply support for MAX31D80T-003+ 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 power management ICs for automotive, industrial, and communications markets.

The MAX31D80T-003+ belongs to Maxim's spread-spectrum clock generator product line, engineered specifically to reduce electromagnetic interference in high-speed digital systems without altering system architecture or adding filtering components.

FAQ

What is the factory-programmed output frequency of the MAX31D80T-003+?

The MAX31D80T-003+ is factory-programmed for a fixed 12MHz output frequency, as confirmed in the Selector Guide table. This value is laser-trimmed during manufacturing and cannot be altered in-circuit. The device accepts only a 12MHz crystal input (X1/X2), and both CLKOUT and XOUT deliver 12MHz signals - the former with down-dither modulation, the latter as a clean buffered replica. No external components or configuration registers affect this frequency.

Does the MAX31D80T-003+ support clock input mode, or is it crystal-only?

The MAX31D80T-003+ is configured exclusively for crystal input mode. Per the Selector Guide and Pin Description, its input frequency is specified as 12MHz crystal - not a clock signal. The X1/X2 pins form a Pierce oscillator interface requiring a 12MHz fundamental-mode crystal with 18pF load capacitance. Applying an external clock to X1 is not supported for this variant; doing so may result in startup failure or unstable operation.

What is the dither magnitude and rate for the MAX31D80T-003+?

The MAX31D80T-003+ features a factory-set down-dither modulation with a dither rate of 25kHz (±4% tolerance) and a dither magnitude ranging from –0.25% to –3.0%, as defined by its SMSEL0/SMSEL1 pin states. Unlike programmable variants, these parameters are permanently configured during manufacturing and cannot be modified after assembly. The 25kHz rate is optimized to suppress narrowband EMI peaks in automotive and industrial frequency bands.

Can the MAX31D80T-003+ operate across the full automotive temperature range?

Yes, the MAX31D80T-003+ is fully specified and tested for continuous operation from –40°C to +125°C ambient temperature, meeting automotive-grade reliability requirements. Its DC and AC electrical characteristics - including supply current (22mA typ), output voltage levels, and jitter (≤75ps) - are guaranteed across this range. The TDFN-EP package's exposed pad must be soldered to a thermal GND plane to maintain junction temperature within limits under maximum load.

How does the MAX31D80T-003+ differ from the MAX31C80T-003+?

The MAX31D80T-003+ implements down-dither spread-spectrum modulation, shifting output frequency only below the 12MHz nominal carrier, whereas the MAX31C80T-003+ (if it existed) would use center-dither - varying symmetrically around 12MHz. However, no MAX31C80T-003+ is listed in the Selector Guide; the documented center-dither variants (e.g., MAX31C80T-UGQ+) all use different output frequencies and dither rates. Thus, MAX31D80T-003+ is the only valid 12MHz down-dither option in this family.