Analog Devices Inc. LTC6990IS6#TRPBF

Overview

LTC6990IS6#TRPBF from Analog Devices is a precision voltage-controlled silicon oscillator (VCO) in TSOT-23-6 package, delivering programmable output frequencies from 488 Hz to 2 MHz with ±1.5% max frequency accuracy over –40°C to +85°C. It uses a single RSET resistor for fixed-frequency operation or dual resistors for linear VCO tuning, features CMOS output sourcing/sinking 20 mA, and supports glitch-free enable/disable via synchronized OE pin - used in timing-critical industrial sensor interfaces and battery-powered instrumentation.

For engineers reviewing the LTC6990IS6#TRPBF datasheet, LTC6990IS6#TRPBF pinout, LTC6990IS6#TRPBF application, or LTC6990IS6#TRPBF equivalent, key selection criteria include its 72 µA supply current at 100 kHz, 500 µs start-up time, 50% duty cycle square wave output, and AEC-Q100-qualified variants for automotive-grade timing stability.

Technical Context

The LTC6990IS6#TRPBF implements 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 programmable across eight integer values (1–128) via a 4-bit A/D converter on the DIV pin.

It integrates synchronous output enable with selectable Hi-Z or low-state disable, 300 kHz+ VCO bandwidth at 1 MHz, and operates from 2.25 V to 5.5 V with <0.005 %/°C frequency drift over temperature - enabling stable timing in vibration-prone environments without crystal-level layout constraints.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX974ESA+ and SiT1533AI-JF-33E-32.768E, the LTC6990IS6#TRPBF uniquely combines wide-range programmability (488 Hz–2 MHz), linear VCO operation, and sub-100 µA power - making it the sole option among these three for adaptive timing in resource-constrained embedded systems.

Availability

LTC6990IS6#TRPBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, battery-powered instrumentation, and automotive cabin electronics requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LTC6990IS6#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The LTC6990IS6#TRPBF belongs to the TimerBlox® family - silicon timing devices engineered to replace crystals, ceramic resonators, and discrete RC oscillators in space-, power-, and reliability-constrained applications.

FAQ

What is the guaranteed operating temperature range for LTC6990IS6#TRPBF?

The LTC6990IS6#TRPBF is specified for –40°C to +85°C operation, with full electrical performance guaranteed across this range per the datasheet. It uses the "I" grade temperature qualification, distinct from the "C" (0°C to 70°C) or "H" (–40°C to 125°C) variants. This makes LTC6990IS6#TRPBF suitable for industrial control cabinets and automotive interior modules where ambient temperatures exceed commercial-grade limits.

Can LTC6990IS6#TRPBF operate from a 2.5 V supply?

Yes, LTC6990IS6#TRPBF operates from 2.25 V to 5.5 V, so 2.5 V is fully supported. At 2.5 V, typical supply current drops to 106 µA (NDIV = 128, RSET = 50 kΩ) and output drive remains compliant (VOL ≤ 0.26 V at 8 mA sink). The device maintains ±1.5% frequency accuracy and 500 µs start-up time - confirming robust low-voltage operation for coin-cell or LiFePO₄-powered designs.

How do I configure LTC6990IS6#TRPBF for fixed-frequency operation?

To configure LTC6990IS6#TRPBF for fixed frequency, connect a precision resistor (RSET) between SET and GND, and set DIV pin voltage using a resistor divider to select NDIV. For example, to generate 100 kHz with NDIV = 10, calculate RSET = (1 MHz × 50 kΩ) / (10 × 100 kHz) = 50 kΩ. Use 1% metal-film RSET and 1% divider resistors per Table 1 in the datasheet - ensuring LTC6990IS6#TRPBF achieves ±1.5% accuracy without trimming.

Does LTC6990IS6#TRPBF support high-impedance output disable?

Yes, LTC6990IS6#TRPBF supports high-impedance output disable when the Hi-Z bit (MSB of DIVCODE) is set to 1. This is configured by setting VDIV/V+ ≥ 0.53125 (e.g., DIVCODE = 8–15). When OE is driven low, OUT enters Hi-Z state instead of being forced low - enabling wired-OR bus architectures and preventing contention in multi-source timing systems. The Hi-Z leakage is ±10 µA, verified across temperature.

What is the maximum output drive capability of LTC6990IS6#TRPBF?

LTC6990IS6#TRPBF provides CMOS push-pull output capable of sourcing and sinking up to ±20 mA, with VOH ≥ 4.84 V and VOL ≤ 0.26 V at 5.5 V supply and full load. Output resistance is ~30 Ω, enabling direct drive of LEDs (with series resistor), small relays, or logic inputs. For sustained 20 mA loads, thermal considerations require keeping ambient temperature below 85°C due to 192°C/W θJA in TSOT-23 package.