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Analog Devices Inc. LTC6905HS5#PBF
- Part No.:
- LTC6905HS5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC6905HS5#PBF.pdf
- Description:
- 17MHZ TO 170MHZ RES SET SOT-23 O
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
LTC6905HS5#PBF from Analog Devices (formerly Linear Technology) is a precision programmable silicon oscillator in a 5-lead TSOT-23 package, generating rail-to-rail CMOS square-wave outputs from 17.225MHz to 170MHz with ±0.5% typical frequency accuracy over 0°C to 70°C and ±1.9% max over –40°C to 125°C. It uses a single external resistor (10kΩ–25kΩ) and a three-state DIV pin to select ÷1/÷2/÷4 division, delivering fast 100μs start-up, 0.5ns rise/fall times (CL = 5pF), and 7.2ps RMS jitter at 170MHz - ideal for high-speed data bus clocking and crystal replacement in industrial control systems.
For engineers reviewing the LTC6905HS5#PBF datasheet, LTC6905HS5#PBF pinout, LTC6905HS5#PBF application, or LTC6905HS5#PBF equivalent, key selection criteria include its guaranteed –40°C to 125°C operating range (H-grade), ±20ppm/°C temperature stability, 2.7V–5.5V single-supply operation, and resistor-programmable frequency without lookup tables.
Technical Context
The LTC6905HS5#PBF implements a proprietary feedback loop that linearizes RSET-to-frequency response, enabling direct calculation via fOSC = (168.5 MHz × 10 kΩ / RSET) + 1.5 MHz. Its master oscillator operates from 68.9MHz to 170MHz, with internal programmable divider (N = 1, 2, or 4) extending usable output range down to 17.225MHz.
Pin 3 (SET) maintains VSET ≈ V+ – 1V with <10pF recommended stray capacitance; Pin 4 (DIV) detects high (V+), floating (midsupply), or low (GND) states using dual 15μA/11μA current sources, enabling robust three-state logic without external pull resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 17.225MHz to 170MHz - covers PCIe reference clocks, USB 2.0 PHY timing, and FPGA system clocks with single-resistor tuning. |
| Frequency Accuracy | ±0.5% typ (0°C to 70°C), ±1.9% max (–40°C to 125°C) - enables drop-in replacement of ±100ppm crystals without calibration. |
| Temp Stability | ±20ppm/°C - ensures stable timing across automotive under-hood and industrial motor drive environments. |
| Rise/Fall Time | 0.5ns (CL = 5pF) - supports clean edge integrity for >100MHz digital interfaces with minimal signal distortion. |
| Timing Jitter | 7.2ps RMS at 170MHz - meets jitter budgets for SerDes clocking and high-resolution ADC sampling clocks. |
| Supply Current | 6mA typ at 100MHz (V+ = 3V) - balances performance and power in space-constrained embedded systems. |
| Duty Cycle | 50% ±2.5% - maintains symmetrical clock edges critical for DDR memory timing and balanced logic paths. |
Pinout & Package
Package: 5-lead TSOT-23 (S5), 1.0mm profile, JEDEC MO-193 compliant, footprint compatible with standard SOT-23 pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Power supply input | Accepts 2.7V–5.5V; requires local 0.1μF bypass to GND for noise immunity and stable oscillation. |
| GND (Pin 2) | Ground reference | Must connect directly to low-impedance ground plane; shared return path for SET and DIV bias currents. |
| SET (Pin 3) | Frequency-setting resistor node | Holds ~1V below V+; resistor (10kΩ–25kΩ) between V+ and SET sets master oscillator frequency linearly. |
| DIV (Pin 4) | Divider ratio control | Three-state detection: tied to V+ → ÷1, floating → ÷2, tied to GND → ÷4; no external pull required. |
| OUT (Pin 5) | CMOS clock output | Rail-to-rail square wave; drives 5kΩ/5pF loads directly; 0.5ns edges support high-speed interface timing. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmed frequency | Eliminates need for crystal load capacitors, trimming, or frequency tables - simplifies BOM and layout. |
| Three-state DIV input | Enables three discrete output frequencies per RSET value without additional logic or I²C interface. |
| Fast 100μs start-up | Supports rapid system wake-up and dynamic clock gating in battery-powered instrumentation. |
| ±20ppm/°C temp drift | Outperforms ceramic resonators and matches mid-tier TCXOs for cost-sensitive industrial applications. |
| 7.2ps RMS jitter at 170MHz | Meets jitter requirements for USB 2.0, SATA Gen1, and FPGA transceiver reference clocks. |
Applications
| High-Speed Data Bus Clocking | FPGA System Clock Generation |
|---|---|
Use Scenario: Providing synchronous clocking for DDR3 memory interfaces on industrial PLC mainboards. IC Role / Device Role / Timing Role: Primary system clock source with deterministic phase alignment across multiple memory channels. Use Value: 50% ±2.5% duty cycle and 0.5ns edge rates ensure setup/hold margin compliance at 400MT/s data rates. |
Use Scenario: Generating configurable reference clocks for Xilinx Artix-7 FPGA configuration and logic fabric. IC Role / Device Role / Timing Role: Programmable clock generator replacing fixed-frequency crystals to support multiple design revisions. Use Value: Single-resistor tuning allows frequency adjustment during prototyping without PCB respin. |
| Crystal Oscillator Replacement | Industrial Sensor Interface Timing |
Use Scenario: Replacing 25MHz fundamental-mode quartz crystals in motor drive gate driver ICs. IC Role / Device Role / Timing Role: High-stability clock source tolerant of board-level vibration and thermal cycling. Use Value: ±20ppm/°C drift and –40°C to 125°C operation exceed quartz reliability in harsh environments. |
Use Scenario: Synchronizing sigma-delta ADC sampling in industrial pressure transmitters. IC Role / Device Role / Timing Role: Low-jitter master clock for precision analog-to-digital conversion. Use Value: 7.2ps RMS jitter at 170MHz translates to <0.001 LSB timing error in 24-bit ADC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6905IS5#PBF | Same architecture and pinout; rated for –40°C to 85°C (I-grade) instead of –40°C to 125°C (H-grade). | Suitable for commercial/industrial ambient environments but not extended-temperature motor control enclosures. | Select LTC6905HS5#PBF when operating above 85°C ambient or requiring full H-grade qualification. |
| LTC6905CS5#PBF | Same architecture and pinout; specified only for 0°C to 70°C (C-grade); ±0.5% accuracy limited to this range. | Valid only for consumer-grade or lab equipment with controlled thermal environments. | Choose LTC6905HS5#PBF for production systems requiring guaranteed performance across full industrial temperature range. |
Compared with LTC6905IS5#PBF and LTC6905CS5#PBF, the LTC6905HS5#PBF provides extended high-temperature operation (up to 125°C junction), tighter specification holdover across –40°C to 125°C, and qualification for mission-critical industrial applications where thermal derating is impractical.
Availability
LTC6905HS5#PBF is available at Aetrix Electronics and suitable for high-speed data bus clocking, FPGA system clock generation, and crystal oscillator replacement requiring stable component supply across extended temperature ranges.
Supply support for LTC6905HS5#PBF 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 maintains its precision analog and mixed-signal product lines, including timing solutions with industry-leading jitter and stability specs.
The LTC6905HS5#PBF belongs to Linear's programmable silicon oscillator family, designed specifically to replace quartz crystals and ceramic resonators in space-constrained, thermally demanding industrial and automotive subsystems.
FAQ
What is the guaranteed operating temperature range for the LTC6905HS5#PBF?
The LTC6905HS5#PBF is fully specified and tested over –40°C to 125°C, with frequency accuracy guaranteed at ±1.9% maximum across this full range. This H-grade rating makes it suitable for under-hood automotive modules, industrial motor drives, and outdoor telecom equipment where ambient temperatures exceed 85°C.
How does the DIV pin on the LTC6905HS5#PBF determine output frequency division?
The DIV pin (Pin 4) on the LTC6905HS5#PBF uses internal current sources to detect three states: tied to V+ selects ÷1 (full master frequency), floating selects ÷2 (mid-range), and tied to GND selects ÷4 (lowest range). No external pull resistors are needed - the device actively biases the pin to midsupply when floating, enabling reliable three-state logic with minimal external components.
Can the LTC6905HS5#PBF achieve better than ±0.5% frequency accuracy?
The LTC6905HS5#PBF achieves ±0.5% typical accuracy over 0°C to 70°C, but its datasheet specifies ±1.9% maximum over –40°C to 125°C. For tighter accuracy, Analog Devices offers the pin-compatible LTC6905-XXX fixed-frequency variants with internal resistors and ±50ppm total accuracy - however, these require selecting a specific frequency at order time rather than field programming.
What is the maximum capacitive load the LTC6905HS5#PBF OUT pin can drive reliably?
The LTC6905HS5#PBF OUT pin is characterized to drive 5pF loads with guaranteed 0.5ns rise/fall times. For larger capacitive loads, the maximum CLOAD (in pF) is calculated as 45454/(ROUT × fOSC), where ROUT is ~27Ω at 3V supply. At 50MHz, this yields ≤33.6pF. Exceeding this limit increases edge distortion and jitter, degrading timing margins in high-speed interfaces.
Does the LTC6905HS5#PBF require external bypassing, and if so, what is the recommended configuration?
Yes - the LTC6905HS5#PBF requires a 0.1μF ceramic capacitor placed directly between V+ (Pin 1) and GND (Pin 2), with no vias or traces between the capacitor pads and pins. This capacitor must be on the same PCB side as the LTC6905HS5#PBF and located within 2mm of the device to suppress supply noise that could modulate frequency or increase jitter, especially at switching regulator frequencies near fMO/64.
LTC6905HS5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Oscillator, Silicon
- Count:
- -
- Frequency:
- 17MHz ~ 170MHz
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 14 mA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- TSOT-23-5
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6905HS5#PBF FAQ
1.How can I place an order for LTC6905HS5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6905HS5#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC6905HS5#PBF reliable?
The price and inventory of LTC6905HS5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6905HS5#PBF is usually 5 days.
3.What payment methods are accepted for LTC6905HS5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6905HS5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6905HS5#PBF?
LTC6905HS5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6905HS5#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC6905HS5#PBF?
For technical support, including LTC6905HS5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6905HS5#PBF requirements.
6.How does Aetrix verify that LTC6905HS5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6905HS5#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC6905HS5#PBF meets industry standards.
7.What is the process for return or replacement of LTC6905HS5#PBF?
All LTC6905HS5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6905HS5#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC6905HS5#PBF part is unused and in its original packaging.
Return procedure for LTC6905HS5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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