Analog Devices Inc. LTC6908HS6-2#TRPBF

Overview

LTC6908HS6-2#TRPBF from Analog Devices is a precision quadrature-output silicon oscillator IC designed for clocking multi-phase switching regulators. It delivers two 50% duty cycle CMOS square wave outputs phase-shifted by 90°, operates from 2.7V to 5.5V, supports 50kHz–10MHz frequency range via single R_SET resistor, and integrates spread spectrum frequency modulation (±10% center frequency) for EMC improvement in power supply applications.

For engineers reviewing the LTC6908HS6-2#TRPBF datasheet, LTC6908HS6-2#TRPBF pinout, LTC6908HS6-2#TRPBF application, or LTC6908HS6-2#TRPBF equivalent, this device serves as a temperature-stable, low-jitter, automotive-grade timing source with programmable SSFM rate (f_OUT/16, /32, /64), fast 260µs startup, and rail-to-rail output drive capability.

Technical Context

The LTC6908HS6-2#TRPBF implements a master oscillator whose frequency is set by I_SET = (V₊ − V_SET)/R_SET, where V_SET is regulated to ~1.13V below V₊. Its output frequency f_OUT = 10 MHz × 10 kΩ / R_SET is derived from a 20 MHz master clock divided by 2.

Spread spectrum modulation uses a 15-bit pseudorandom noise generator filtered by a single-pole LPF (corner = f_OUT/N) to modulate I_MASTER between 0.9×I_SET and 1.1×I_SET, producing ±10% frequency deviation. The MOD pin selects N = 16/32/64 or disables modulation via AC detection when tied to an output.

Key Specifications

Pinout & Package

Package: 6-lead TSOT-23 (S6), 1 mm profile, exposed pad (GND), rated for TJ_MAX = 150°C and θ_JA = 230°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6908IS6-2#TRPBF, the LTC6908HS6-2#TRPBF adds guaranteed operation up to +125°C and AEC-Q100 qualification-critical for automotive power systems-while retaining identical electrical performance and footprint. Versus Si5351A-D-GM, it offers simpler design-in, lower jitter at low frequencies, and hardware-only SSFM control, but lacks multi-output programmability.

Availability

LTC6908HS6-2#TRPBF is available at Aetrix Electronics and suitable for automotive power modules, portable medical devices, and industrial PLC timing circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6908HS6-2#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 (now part of Analog Devices, Inc., a global leader in high-performance analog, mixed-signal, and digital signal processing technologies) designs precision signal chain and power management ICs for demanding industrial, automotive, and communications applications.

The LTC6908HS6-2#TRPBF belongs to the LTC® precision oscillator family, engineered specifically for electromagnetic compatibility-critical power conversion systems-delivering accurate, low-jitter, spread-spectrum-capable timing with minimal external components.

FAQ

What is the operating temperature range of the LTC6908HS6-2#TRPBF?

The LTC6908HS6-2#TRPBF is specified for continuous operation from −40°C to +125°C and is AEC-Q100 qualified for automotive applications. This extended range is validated across all electrical parameters including frequency accuracy (±1.5% max at 25°C/3V), supply current, and SSFM functionality-making it suitable for under-hood power modules and industrial environments where thermal stress is critical. The HS grade distinguishes it from CS and IS variants with narrower temperature limits.

How does the MOD pin control spread spectrum modulation on the LTC6908HS6-2#TRPBF?

The MOD pin on the LTC6908HS6-2#TRPBF selects SSFM behavior via three-state logic: grounding MOD enables f_OUT/16 modulation rate; leaving MOD floating selects f_OUT/32; tying MOD to V+ sets f_OUT/64. Connecting either OUT1 or OUT2 to MOD disables SSFM entirely via internal AC detection. No external resistors or timing components are needed-the LTC6908HS6-2#TRPBF handles all modulation logic internally, including pseudorandom noise generation and lowpass filtering.

What is the maximum frequency accuracy specification for the LTC6908HS6-2#TRPBF?

The LTC6908HS6-2#TRPBF guarantees frequency accuracy ≤ ±1.5% maximum at T_A = 25°C and V₊ = 3V for 250 kHz ≤ f_OUT ≤ 5 MHz. Over the full −40°C to +125°C range, accuracy degrades to ±3.5% (for 50 kHz ≤ f_OUT < 250 kHz at V₊ = 2.7V) per the datasheet's guaranteed min/max tables. Accuracy is defined relative to the ideal f_OUT = 10 MHz × 10 kΩ / R_SET equation and depends on R_SET tolerance and temperature coefficient.

Can the LTC6908HS6-2#TRPBF drive standard logic inputs directly?

Yes, the LTC6908HS6-2#TRPBF outputs are rail-to-rail CMOS-compatible square waves capable of directly driving standard 5V or 3.3V logic families (e.g., 74HC, LVC) with load conditions up to 5 kΩ || 5 pF. Output voltage levels meet VOH ≥ 4.4 V (at V₊ = 5V, I_OH = −1.2 mA) and VOL ≤ 0.2 V (at V₊ = 5V, I_OL = 1.2 mA). However, for systems sensitive to cycle-to-cycle jitter-such as high-speed FPGAs-the pseudorandom SSFM waveform may require evaluation against timing budgets.

What package type and thermal characteristics apply to the LTC6908HS6-2#TRPBF?

The LTC6908HS6-2#TRPBF uses the 6-lead TSOT-23 (S6) package with 1 mm height and thermally enhanced exposed pad (Pin 7 = GND). Its thermal resistance is θ_JA = 230°C/W (JEDEC-standard board), and maximum junction temperature is T_JMAX = 150°C. The exposed pad must be soldered to a PCB ground plane for optimal thermal dissipation and EMI performance-failure to do so risks exceeding T_JMAX under sustained 10 MHz operation at 5.5V.