Analog Devices Inc./Maxim Integrated MAX038CWP+

Overview

MAX038CWP+ from Maxim Integrated is a high-frequency precision function generator IC producing triangle, sawtooth, sine, square, and pulse waveforms with 0.1Hz–20MHz frequency range, ±2.3V independent duty-cycle control, and 2V_P-P low-impedance output. It serves as the core waveform synthesis engine in lab-grade signal sources, PLL reference generators, and FSK modulators requiring stable analog timing.

For engineers reviewing the MAX038CWP+ datasheet, MAX038CWP+ pinout, MAX038CWP+ application, or MAX038CWP+ equivalent, this page delivers verified specifications, validated SO-20 package mapping, confirmed waveform selection logic (A0/A1), real-world SYNC timing behavior, and two rigorously cross-checked alternative parts for voltage-controlled oscillator and function generator designs.

Technical Context

The MAX038CWP+ implements a relaxation oscillator architecture with dual constant-current sources charging/discharging COSC to generate simultaneous triangle and square waves. Its internal 2.50V bandgap reference (REF) enables precise IIN current programming via R_IN, while FADJ and DADJ inputs apply ±2.4V and ±2.3V analog modulation with <±2.5% frequency shift per volt and <±2% duty-cycle shift per volt respectively.

Waveform selection is performed by TTL/CMOS-compatible A0 and A1 pins routing triangle, sine, or square outputs through an internal multiplexer. The SYNC output provides a 50%-duty-cycle TTL-compatible clock referenced to DGND/DV+, synchronized to zero-crossing of sine/triangle or mid-point of square wave, with 10ns rise/fall times and independent operation from DADJ control.

Key Specifications

Pinout & Package

MAX038CWP+ is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with exposed pad thermal enhancement. All five GND pins (2,6,9,11,18) must be connected to a quiet ground plane; internal isolation prevents shared noise coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-frequency function generator applications.

Compared with MAX038CWP+, AD9833BRMZ-REEL offers superior digital control and resolution but demands external filtering and lacks the integrated sine shaper and SYNC timing coordination, while ICL8038CPAZ provides basic waveform generation at lower cost but fails to meet 20MHz bandwidth, 200ppm/°C stability, or 50% SYNC duty-cycle requirements of modern test systems.

Availability

MAX038CWP+ is available at Aetrix Electronics and suitable for precision function generators, voltage-controlled oscillators, FSK modulators, phase-locked loop references, and swept-frequency analyzers requiring stable component supply across industrial, test & measurement, and aerospace design cycles.

Supply support for MAX038CWP+ 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 high-performance analog and mixed-signal ICs for precision timing, power management, and data conversion applications.

The MAX038 product line targets high-fidelity waveform synthesis in test equipment and communications infrastructure, emphasizing wideband analog accuracy, low distortion, and deterministic timing interfaces like SYNC and phase detection.

FAQ

What is the maximum operating frequency of the MAX038CWP+?

The MAX038CWP+ achieves a maximum operating frequency of 20MHz under standard conditions (IIN = 500µA, CF ≤ 15pF). At higher frequencies, waveform distortion increases due to internal propagation delays and limited slew rate of the output amplifier. Operation beyond 20MHz is possible but not characterized in the datasheet and may compromise sine-wave THD and triangle-linearity specifications. The MAX038CWP+ maintains guaranteed performance up to 20MHz across its full 0°C to +70°C temperature range.

How does the MAX038CWP+ generate sine waveforms with low distortion?

The MAX038CWP+ uses an internal triangle-to-sine shaping circuit that applies piecewise-linear correction to the fundamental triangle wave, reducing even-order harmonics. With CF = 1000pF and Fo = 100kHz, total harmonic distortion is specified at ≤2.0%. The circuit relies on precise 50% duty-cycle symmetry; applying small adjustments (±100mV) to DADJ minimizes residual asymmetry and further lowers THD. This analog shaping approach avoids the spectral artifacts common in DDS-based solutions and delivers consistent 2V_P-P amplitude across all frequencies without gain compensation.

Can the MAX038CWP+ operate from a single supply?

No, the MAX038CWP+ requires dual ±5V supplies (V+ = +5V, V− = −5V) for proper operation of its internal current sources, reference circuitry, and output stage. The datasheet specifies absolute maximum ratings of −6V to +6V on V− and V+, and operational limits of −5.25V to −4.75V and +4.75V to +5.25V. Attempting single-supply operation violates the internal biasing scheme and will prevent oscillation or cause latch-up. The separate DV+/DGND pins for SYNC allow digital sections to remain active even if analog supplies are sequenced independently.

What is the purpose of the SYNC output on the MAX038CWP+?

The SYNC output on the MAX038CWP+ is a TTL/CMOS-compatible 50%-duty-cycle square wave synchronized to the internal oscillator's zero-crossing point (for sine/triangle) or midpoint (for square). It provides deterministic timing alignment for external devices such as ADC sampling clocks, gate drivers, or secondary waveform generators. Unlike the main OUT signal, SYNC is powered from dedicated DV+/DGND pins and maintains strict 50% duty cycle regardless of DADJ settings, enabling reliable multi-channel synchronization without additional logic or delay matching.

How do I set the output frequency of the MAX038CWP+ using a resistor and capacitor?

Set the MAX038CWP+ output frequency using the formula Fo (MHz) = IIN (µA) ÷ CF (pF), where IIN is generated by connecting a resistor R_IN between REF (2.50V) and the IIN pin: IIN = 2.50V ÷ R_IN. For example, R_IN = 25kΩ yields IIN = 100µA; with CF = 100pF, Fo = 1MHz. Optimal linearity and temperature stability occur with IIN between 10µA and 400µA. Stray capacitance at COSC must be minimized using ground-plane shielding, and NPO ceramic capacitors are recommended for CF to maintain accuracy across temperature.