Analog Devices Inc. LTC6904MPMS8#TRPBF

Overview

LTC6904MPMS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision, serially programmable oscillator IC delivering a digitally tunable square-wave clock output from 1.039 kHz to 68 MHz via I²C interface. It operates from a single 2.7V–5.5V supply, features ±0.75% initial frequency accuracy, 10 ppm/°C temperature drift, and –55°C to 125°C extended industrial operation in an 8-lead MSOP package - used for microcontroller clocking, power management timing, and switched-capacitor filter synchronization.

For engineers reviewing the LTC6904MPMS8#TRPBF datasheet, LTC6904MPMS8#TRPBF pinout, LTC6904MPMS8#TRPBF application, or LTC6904MPMS8#TRPBF equivalent, key selection criteria include its guaranteed –55°C to 125°C operating range, I²C address configurability via ADR pin, dual CLK/CLK outputs with independent enable control, 0.1% frequency resolution, and <0.4% typical jitter below 8 MHz.

Technical Context

The LTC6904MPMS8#TRPBF integrates a high-frequency VCO (34–68 MHz) with a proprietary feedback loop that linearizes digital-to-frequency mapping using a 10-bit DAC and 4-bit OCT divider. Its internal architecture enables monotonic frequency stepping across octave boundaries without glitches, with settling time ≤100 µs when changing DAC bits.

Unlike PLL-based synthesizers, it uses direct division of a master oscillator, eliminating reference spurs and simplifying layout. The I²C interface supports standard-mode (10–100 kHz) operation with configurable 7-bit slave address (0010110 or 0010111), ACK-handshaked write-word protocol, and no read-back capability - optimized for low-pin-count, low-software-overhead clock provisioning.

Key Specifications

Pinout & Package

Package: 8-lead plastic MSOP (MS8), 3.0 mm × 3.0 mm × 1.1 mm, –55°C to 125°C rated, RoHS-compliant, tape-and-reel (TRPBF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally programmable oscillator applications.

Compared with LTC6904HMS8#TRPBF and LTC6902IMS8#TRPBF, the LTC6904MPMS8#TRPBF uniquely delivers guaranteed –55°C startup and operation while retaining identical I²C programmability and dual-clock flexibility - making it the sole option for ultra-wide-temperature timing-critical systems.

Availability

LTC6904MPMS8#TRPBF is available at Aetrix Electronics and suitable for microcontroller clocking, power management timing, and switched-capacitor filter synchronization requiring stable component supply across extended temperature extremes.

Supply support for LTC6904MPMS8#TRPBF 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

Analog Devices acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for legacy Linear parts including the LTC6904 series.

The LTC6904 belongs to Linear's precision programmable oscillator family, designed specifically for applications demanding wide-range digital frequency control without external components - targeting industrial, aerospace, and medical systems where reliability and temperature resilience are non-negotiable.

FAQ

What is the operating temperature range of the LTC6904MPMS8#TRPBF?

The LTC6904MPMS8#TRPBF is fully specified and tested over –55°C to 125°C, with guaranteed performance including ±0.75% initial accuracy and 10 ppm/°C drift across this entire range. This exceeds the –40°C to 125°C rating of the LTC6904HMS8#TRPBF and makes the LTC6904MPMS8#TRPBF suitable for downhole, aerospace, and extreme-environment industrial deployments where cold-start reliability is critical.

Does the LTC6904MPMS8#TRPBF support I²C repeated START conditions?

Yes, the LTC6904MPMS8#TRPBF fully complies with standard I²C timing requirements for repeated START conditions, including tHD,STA ≥ 4.0 µs, tSU,STA ≥ 4.7 µs, and tBUF ≥ 4.7 µs. Its I²C interface is designed for interoperability with standard microcontroller I²C peripherals and SMBus hosts without timing violations, enabling robust multi-byte writes in noisy industrial environments.

How does the OE pin interact with the internal output configuration registers in the LTC6904MPMS8#TRPBF?

The OE (Output Enable) pin on the LTC6904MPMS8#TRPBF operates asynchronously and overrides all serial register settings: when OE is LOW, both CLK and CLK outputs are forced to logic LOW regardless of CNF[1:0] register state or frequency programming. This provides hardware-level fail-safe clock gating independent of firmware or I²C bus integrity - a critical feature for safety-critical power sequencing in the LTC6904MPMS8#TRPBF.

Can the LTC6904MPMS8#TRPBF drive a 10pF capacitive load without accuracy degradation?

No - the LTC6904MPMS8#TRPBF is characterized and guaranteed for ≤5pF capacitive load per output. Driving 10pF (e.g., a standard 10× oscilloscope probe) may degrade frequency accuracy by up to 0.5% at 68 MHz due to increased loading on the internal output stage. For loads >5pF, a high-speed buffer such as the LTC6904MPMS8#TRPBF must be used to maintain datasheet-specified accuracy and jitter performance.

What is the power-up default frequency and output state of the LTC6904MPMS8#TRPBF?

At power-up, the LTC6904MPMS8#TRPBF resets all internal registers to zero, resulting in a default output frequency of 1.039 kHz on both CLK and CLK pins, with CNF[1:0] = 00 (both outputs enabled, CLK inverted relative to CLK). The OE pin remains inactive (HIGH), allowing immediate clock output without I²C initialization - ensuring deterministic boot behavior for time-sensitive systems using the LTC6904MPMS8#TRPBF.