Analog Devices Inc. LTC6990HS6#WTRPBF

Overview

LTC6990HS6#WTRPBF from Analog Devices is a precision voltage-controlled silicon oscillator in the TimerBlox® family, delivering programmable output frequencies from 488 Hz to 2 MHz with ±1.5% max frequency accuracy over –40°C to 125°C. It operates from a single 2.25 V to 5.5 V supply, draws as low as 56 µA at 2.25 V, and features CMOS-compatible 20 mA drive capability with 50% duty cycle square wave output. It serves as a drop-in replacement for fixed crystal oscillators in automotive sensor modules requiring AEC-Q100-compliant timing.

For engineers reviewing the LTC6990HS6#WTRPBF datasheet, LTC6990HS6#WTRPBF pinout, LTC6990HS6#WTRPBF application, or LTC6990HS6#WTRPBF equivalent, key selection criteria include its automotive-grade temperature range (–40°C to 125°C), programmable 1–128 frequency division via DIV pin resistor network, synchronized output enable with glitch-free operation, and VCO tuning bandwidth >300 kHz at 1 MHz.

Technical Context

The LTC6990HS6#WTRPBF integrates a master oscillator (1 MHz max) controlled by SET-pin current (ISET = VSET/RSET), where VSET is internally regulated to 1.00 V ±30 mV. Its output frequency is derived as fOUT = (1 MHz × 50 kΩ) / (NDIV × RSET), with NDIV selected via a 4-bit A/D converter monitoring DIV pin voltage (VDIV/V+ = (DIVCODE + 0.5)/16 ±1.5%).

It implements synchronous output enable (OE) with propagation delay <44 ns and enables high-impedance or forced-low output disable states based on the MSB of DIVCODE. The device includes power-on reset (POR), 500 µs typical start-up time, and supports both fixed-frequency (single RSET) and linear VCO modes (dual-resistor control).

Key Specifications

Pinout & Package

Package: 6-lead TSOT-23 (S6), 1 mm profile, RoHS-compliant, lead-free finish. Exposed pad not present in S6 package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX974CSA+ and SiT1533AI-JE-33E-32.768E, the LTC6990HS6#WTRPBF uniquely combines automotive-grade temperature range, resistor-programmable division (1–128), and linear VCO operation - enabling one device to replace multiple fixed-frequency crystals across diverse subsystems.

Availability

LTC6990HS6#WTRPBF is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PWM controllers, battery-powered IoT nodes, and high-vibration condition-monitoring equipment requiring stable component supply across extended temperature ranges.

Supply support for LTC6990HS6#WTRPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC6990HS6#WTRPBF belongs to the TimerBlox® family of silicon timing devices, engineered to replace quartz and ceramic oscillators with programmable, robust, and space-efficient alternatives for demanding embedded timing applications.

FAQ

What is the operating temperature range for the LTC6990HS6#WTRPBF?

The LTC6990HS6#WTRPBF is rated for –40°C to 125°C and is AEC-Q100 qualified for automotive Grade H applications. This specification is guaranteed across the full range, unlike commercial-grade variants (e.g., LTC6990CS6#TRPBF), which are only tested from 0°C to 70°C. The LTC6990HS6#WTRPBF maintains ±1.5% frequency accuracy within this range using internal trimming and temperature-compensated design.

How do I configure the LTC6990HS6#WTRPBF for fixed-frequency operation?

To configure the LTC6990HS6#WTRPBF for fixed-frequency operation, connect a precision resistor (RSET) between the SET pin and GND, and use a resistor divider on the DIV pin to set the desired NDIV value (1–128). For example, to generate 100 kHz with NDIV = 10, calculate RSET = (1 MHz × 50 kΩ) / (10 × 100 kHz) = 50 kΩ. Use 0.5% metal-film resistors for best accuracy. The LTC6990HS6#WTRPBF then delivers stable output without external clock sources or firmware.

Does the LTC6990HS6#WTRPBF support voltage-controlled oscillator (VCO) mode?

Yes, the LTC6990HS6#WTRPBF supports linear VCO mode by adding a second resistor between the SET pin and a control voltage (VCTRL). This creates a current sum at SET that modulates the master oscillator frequency. The VCO bandwidth exceeds 300 kHz at 1 MHz output, supporting fast analog modulation. The LTC6990HS6#WTRPBF's transfer function is fOUT = (2 MHz − VCTRL × MHz/V), enabling predictable tuning across its 16:1 range.

What is the purpose of the DIV pin on the LTC6990HS6#WTRPBF?

The DIV pin on the LTC6990HS6#WTRPBF serves a dual function: it selects the programmable frequency divider ratio (NDIV = 1, 2, 4…128) and determines the output state during disable (high-impedance or forced-low) via the Hi-Z bit. An internal 4-bit A/D converter reads VDIV/V+ to derive DIVCODE, with ideal VDIV/V+ = (DIVCODE + 0.5)/16 ±1.5%. The LTC6990HS6#WTRPBF requires <100 pF capacitance on this pin for reliable code detection.

Can the LTC6990HS6#WTRPBF replace a crystal oscillator in my design?

Yes, the LTC6990HS6#WTRPBF is explicitly designed as a drop-in replacement for fixed crystal and ceramic oscillators. It eliminates mechanical vibration sensitivity, cold-start delays, and board-space constraints associated with crystals. With identical 6-lead TSOT-23 footprint and CMOS output compatibility, the LTC6990HS6#WTRPBF integrates seamlessly into existing layouts while offering programmability, wider temperature range, and AEC-Q100 compliance unavailable in passive timing devices.