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 (0.1Ω), used in voltage-controlled oscillators, FSK generators, and phase-locked loop reference sources.

For engineers reviewing the MAX038CWP datasheet, MAX038CWP pinout, MAX038CWP application, or MAX038CWP equivalent, this page delivers verified electrical parameters, waveform selection logic, SYNC timing behavior, thermal drift (200ppm/°C), and SO-20 package interface details required for analog signal chain design, test equipment development, and frequency synthesis validation.

Technical Context

The MAX038CWP implements a relaxation oscillator architecture using constant-current charging/discharging of an external capacitor (COSC) to generate triangle and square waves simultaneously; sine output is derived via on-die shaping circuitry with ≤2% THD at 100kHz. Frequency is set by IIN current (2–750µA), FADJ voltage (±2.4V), and COSC value (20pF–100µF), with Fo = IIN(µA)/CF(pF) when VFADJ = 0V.

Duty cycle is controlled independently via DADJ (±2.3V), adjusting charge/discharge current ratio to achieve 15–85% range without significant frequency shift (<2% deviation). The internal 2.50V bandgap reference (REF) enables stable resistor-based programming of IIN, FADJ, and DADJ, with load regulation of 1–4mV/mA and 20ppm/°C temperature coefficient.

Key Specifications

Pinout & Package

MAX038CWP is housed in a 20-pin SO (Small Outline) package with exposed pad thermal enhancement, compatible with standard surface-mount reflow profiles and PCB layout practices for mixed-signal ICs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9833BRMZ and ICL8038CPD, the MAX038CWP uniquely combines 20MHz analog frequency control, independent DADJ/FADJ modulation, on-chip phase detection, and 50% SYNC output-making it optimal for mixed-signal test instrumentation and analog PLL designs where voltage-driven agility and thermal stability are prioritized over digital precision.

Availability

MAX038CWP is available at Aetrix Electronics and suitable for precision function generators, voltage-controlled oscillators, FSK modulators, and phase-locked loop reference circuits requiring stable component supply across industrial, test & measurement, and communications applications.

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 precision analog and mixed-signal ICs for demanding performance applications including power management, sensing, and signal conditioning.

The MAX038CWP belongs to Maxim's high-frequency waveform generator product line, engineered specifically for benchtop test equipment, analog synthesizers, and PLL reference subsystems requiring wideband, low-distortion, and thermally stable signal sources.

FAQ

What is the maximum operating frequency of the MAX038CWP?

The MAX038CWP achieves a maximum operating frequency of 20MHz under specified conditions (CF ≤ 15pF, IIN = 500µA). At higher frequencies, waveform distortion increases due to internal timing limitations and parasitic effects. For reliable 20MHz operation, use low-inductance layout, minimize COSC trace length, and select CF = 20pF with IIN = 400µA. The MAX038CWP datasheet confirms this limit in the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the MAX038CWP generate sine wave output with low distortion?

The MAX038CWP generates sine wave output by passing the internal triangle waveform through an on-die sine-shaping circuit that corrects harmonic content. This results in ≤2% total harmonic distortion (THD) at 100kHz with CF = 1000pF. Distortion is minimized further by adjusting DADJ to precisely 0V (50% duty cycle) or applying small corrections (±100mV) to eliminate even-order harmonics. The MAX038CWP's sine output maintains constant 2V_P-P amplitude across frequency.

Can the MAX038CWP operate from a single supply?

No, the MAX038CWP requires dual ±5V supplies (V+ = +5V, V− = −5V) as specified in its Absolute Maximum Ratings and Electrical Characteristics. The internal oscillator, reference, and output amplifier architectures depend on symmetric rail operation. Attempting single-supply operation violates the −0.3V to −6V rating on V− and will cause functional failure or permanent damage. The MAX038CWP datasheet explicitly defines operating conditions only for ±5V ±5% supplies.

What is the purpose of the five GND pins on the MAX038CWP?

The five GND pins (pins 2, 6, 9, 11, 18) on the MAX038CWP are not internally connected-they serve distinct analog and digital grounding functions. Pins 2, 6, 9, 11 connect to analog ground; pin 18 connects to digital ground (DGND). This separation prevents digital switching noise from corrupting sensitive analog timing nodes like COSC and REF. The MAX038CWP datasheet mandates connecting all five to a quiet ground plane with short, low-inductance traces to ensure low-distortion waveform generation.

How is waveform selection implemented on the MAX038CWP?

Waveform selection on the MAX038CWP is controlled by TTL/CMOS-compatible logic levels applied to pins A0 (pin 3) and A1 (pin 4): A0=0/A1=0 selects square wave; A0=1/A1=0 selects triangle wave; A0=X/A1=1 selects sine wave. Selection occurs within 0.3µs regardless of output phase, though transient artifacts may persist for up to 0.5µs. The MAX038CWP supports dynamic switching during operation without reset or synchronization requirements.