Analog Devices Inc. LTC6990MPS6#TRPBF

Overview

LTC6990MPS6#TRPBF from Analog Devices is a precision voltage-controlled silicon oscillator (VCO) in a 6-lead TSOT-23 package, operating from –55°C to 125°C. It delivers programmable output frequencies from 488 Hz to 2 MHz with ±1.5% max frequency accuracy, 50% duty cycle square wave output, and CMOS-compatible 20 mA drive capability. It serves as a low-power, AEC-Q100 qualified replacement for crystal oscillators in harsh-environment timing applications.

For engineers reviewing the LTC6990MPS6#TRPBF datasheet, LTC6990MPS6#TRPBF pinout, LTC6990MPS6#TRPBF application, or LTC6990MPS6#TRPBF equivalent, key selection considerations include its single-resistor fixed-frequency programming, dual-resistor VCO tuning range configuration, synchronized output enable with glitch-free operation, and extended temperature-grade qualification for automotive and industrial systems.

Technical Context

The LTC6990MPS6#TRPBF implements a master oscillator core (1 MHz max) controlled by regulated SET-pin current (I_SET = V_SET/R_SET, V_SET = 1.00 V ±30 mV), feeding an 8-step programmable divider (NDIV = 1–128) selected via a V⁺-referenced 4-bit ADC on the DIV pin. Its internal POR and OE-synchronized enable logic ensure clean output startup and disable transitions.

It supports two distinct operational modes: fixed-frequency (single R_SET) with <1.5% max error, and voltage-controlled (dual-resistor R_SET/R_VCO) with >300 kHz modulation bandwidth at 1 MHz f_OUT. The Hi-Z bit embedded in DIVCODE determines whether the disabled output is forced low or placed in high-impedance state.

Key Specifications

Pinout & Package

Package: 6-lead Plastic TSOT-23 (S6), 1 mm profile, exposed pad optional, rated for –55°C to 125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SiT1533AI-H4-33E-32.768D and MAX9744ETA+T, the LTC6990MPS6#TRPBF uniquely combines wide-range programmability (488 Hz–2 MHz), true analog VCO capability, and extended temperature operation - making it the sole viable option for ruggedized, tunable timing in automotive and industrial designs.

Availability

LTC6990MPS6#TRPBF is available at Aetrix Electronics and suitable for automotive ECU timing, industrial sensor node wake-up clocks, medical infusion pump motor control, programmable LED dimming drivers, and high-vibration environment timing applications requiring stable component supply across extended temperature ranges.

Supply support for LTC6990MPS6#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC6990MPS6#TRPBF belongs to the TimerBlox® family of silicon timing devices, designed specifically to replace quartz-based oscillators with programmable, robust, and integration-friendly alternatives for demanding embedded timing applications.

FAQ

What is the guaranteed operating temperature range for the LTC6990MPS6#TRPBF?

The LTC6990MPS6#TRPBF is specified for continuous operation from –55°C to 125°C. This MP-grade qualification is explicitly documented in the Analog Devices datasheet Rev. D, Order Information table, and Absolute Maximum Ratings section - confirming its suitability for under-hood automotive and extreme industrial environments where standard commercial or industrial grade oscillators would fail.

How does the LTC6990MPS6#TRPBF achieve ±1.5% frequency accuracy without external calibration?

The LTC6990MPS6#TRPBF achieves ±1.5% max frequency accuracy through internal regulation of the SET pin voltage to 1.00 V ±30 mV, decoupling output frequency from supply and temperature drift. When used with a precision resistor (R_SET = 50k–800kΩ), the f_OUT equation f_OUT = 1 MHz × 50k / (NDIV × R_SET) depends only on R_SET tolerance and inherent IC accuracy - eliminating need for trimming or calibration in the LTC6990MPS6#TRPBF design.

Can the LTC6990MPS6#TRPBF be used as a direct replacement for a 1 MHz crystal oscillator?

Yes - the LTC6990MPS6#TRPBF can replace a 1 MHz crystal oscillator when configured with NDIV = 1 and R_SET = 50 kΩ (per f_OUT = 1 MHz × 50k / (1 × R_SET)). It delivers identical 1 MHz, 50% duty cycle CMOS output but adds benefits: no load capacitance sensitivity, faster 500 µs startup, immunity to board vibration, and programmability for future frequency adjustments - all within the same SOT-23 footprint as the LTC6990MPS6#TRPBF.

What is the purpose of the DIV pin on the LTC6990MPS6#TRPBF, and how is it configured?

The DIV pin on the LTC6990MPS6#TRPBF connects to an internal V⁺-referenced 4-bit ADC that reads V_DIV/V⁺ to determine both the frequency divider ratio (NDIV = 1–128) and the Hi-Z output state during disable. It is configured using a resistor divider (e.g., R1 = 1000 kΩ, R2 = 392 kΩ for NDIV = 16, Hi-Z = 0) per Table 1 in the datasheet - with V_DIV/V⁺ tolerance held to ±1.5% to ensure correct LTC6990MPS6#TRPBF operation.

Does the LTC6990MPS6#TRPBF support high-impedance output disable, and how is it enabled?

Yes - the LTC6990MPS6#TRPBF supports high-impedance output disable via the Hi-Z bit embedded in the DIVCODE value. When the MSB of DIVCODE = 1 (e.g., DIVCODE = 8–15), driving OE low places OUT in high-impedance state instead of forcing it low. This is configured by setting V_DIV/V⁺ ≥ 0.53125 (e.g., R1 = 887 kΩ, R2 = 1000 kΩ), enabling wired-OR bus architectures - a defined behavior of the LTC6990MPS6#TRPBF confirmed in the Pin Functions and Operation sections.