Analog Devices Inc. LTC6905HS5-100#TRPBF

Overview

LTC6905HS5-100#TRPBF from Analog Devices (formerly Linear Technology) is a precision fixed-frequency silicon oscillator in ThinSOT-23 package, delivering factory-trimmed output frequencies of 100MHz, 50MHz, and 25MHz via internal ÷1/÷2/÷4 divider. It operates from 2.7V to 5.5V, features ±0.5% typical frequency accuracy at 25°C, ±20ppm/°C temperature stability, and rail-to-rail CMOS output driving 600Ω loads - used in high-reliability clocking for data acquisition and industrial control systems.

For engineers reviewing the LTC6905HS5-100#TRPBF datasheet, LTC6905HS5-100#TRPBF pinout, LTC6905HS5-100#TRPBF application, or LTC6905HS5-100#TRPBF equivalent, key selection criteria include its H-grade (–40°C to 125°C) operation, fast 100µs start-up, synchronous OE control, low timing jitter (<0.8%), and compatibility with noise-sensitive timing paths requiring stable single-supply oscillation without external crystals.

Technical Context

The LTC6905HS5-100#TRPBF integrates a master oscillator core with a three-state programmable divider (N = 1, 2, or 4), enabling three discrete output frequencies from a single device. Its internal bias circuit maintains V_RES = 1V ±5%, ensuring stable frequency generation independent of supply variation within specified limits.

It uses asynchronous output disable via OE pin (low = immediate disable) and synchronous enable (high = next rising edge), eliminating pulse slivers. The DIV pin detects high/low/floating states using dual 15µA current sources, allowing robust logic-level selection without external buffers - critical for space-constrained PCB layouts.

Key Specifications

Pinout & Package

Package: 5-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant, footprint compatible with standard SOT-23 land pattern.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-frequency oscillator applications.

Compared with LTC6905IS5-100#TRPBF, the LTC6905HS5-100#TRPBF adds extended temperature capability without sacrificing jitter or start-up performance; versus SiT8008BI-13-33E-100.000000, it trades absolute stability for on-chip frequency division and wider supply voltage range - enabling simpler system-level clock tree design.

Availability

LTC6905HS5-100#TRPBF is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical imaging, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6905HS5-100#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 continues to manufacture, qualify, and support its precision analog and mixed-signal portfolio including timing ICs.

The LTC6905 series was designed as a drop-in replacement for fixed-frequency crystals and ceramic resonators - targeting space-constrained, high-reliability applications where board-level component count, thermal stability, and start-up speed are critical.

FAQ

What is the operating temperature range for the LTC6905HS5-100#TRPBF?

The LTC6905HS5-100#TRPBF is rated for operation from –40°C to 125°C, with full electrical specifications guaranteed across this extended industrial temperature range. This H-grade qualification makes it suitable for under-hood automotive, industrial motor control, and aerospace applications where ambient conditions exceed standard commercial or industrial grade limits. The part's ±20ppm/°C frequency drift specification applies across the entire –40°C to 125°C range.

How does the DIV pin select output frequency on the LTC6905HS5-100#TRPBF?

The DIV pin on the LTC6905HS5-100#TRPBF selects between three output frequencies using three distinct states: tied to V+ selects ÷1 (100MHz), left floating selects ÷2 (50MHz), and tied to GND selects ÷4 (25MHz). Internal 15µA current sources detect the state - no external pull resistors are needed. This three-state logic eliminates external components while maintaining robust noise immunity in electrically noisy environments.

Can the LTC6905HS5-100#TRPBF drive a 50Ω transmission line directly?

The LTC6905HS5-100#TRPBF cannot drive a 50Ω transmission line directly due to its CMOS output stage, which is specified for ≥600Ω loads. To interface with 50Ω systems, a series resistor (e.g., 450Ω) is required to match impedance and prevent reflections. Application Note 6905x TA02 shows this configuration using a 950Ω series resistor with 50Ω cable termination - confirming that direct 50Ω drive is not supported by the LTC6905HS5-100#TRPBF's output architecture.

What is the start-up behavior of the LTC6905HS5-100#TRPBF when power is applied?

The LTC6905HS5-100#TRPBF achieves frequency stability within 1% of its final value in 100µs typical after V+ reaches regulation - verified across –40°C to 125°C. During start-up, the output remains inactive until the oscillator locks; OE must be high (or floating) for output to begin. No external reset or delay circuitry is needed, making the LTC6905HS5-100#TRPBF ideal for fast-wake applications like battery-powered sensors and modular instrumentation.

Does the LTC6905HS5-100#TRPBF require an external bypass capacitor?

Yes - the LTC6905HS5-100#TRPBF requires a minimum 0.1µF ceramic capacitor placed directly between V+ (Pin 1) and GND (Pin 2), with no vias or traces between the capacitor and pins. This bypass is mandatory to suppress supply noise that could modulate the oscillator frequency or increase jitter. Layout guidelines specify placement on the same PCB side as the device and connection to a solid ground plane using multiple vias - failure to follow this degrades the LTC6905HS5-100#TRPBF's ±0.5% accuracy and <0.8% jitter performance.