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Analog Devices Inc. LTC6902IMS#PBF
- Part No.:
- LTC6902IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC6902IMS#PBF.pdf
- Description:
- IC OSC SILICON PROG 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:634
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Product details
Overview
LTC6902IMS#PBF from Analog Devices (formerly Linear Technology) is a precision multiphase oscillator IC with spread spectrum frequency modulation (SSFM), delivering 2-, 3-, or 4-phase CMOS clock outputs. It operates from 2.7V to 5.5V, achieves ±1.5% frequency accuracy over 5kHz–10MHz at 25°C, features 400µA typical supply current at 1MHz/3V, and uses two external resistors (RSET, RMOD) for frequency and spreading control. It is used as a low-EMI clock reference in switching power supplies.
For engineers reviewing the LTC6902IMS#PBF datasheet, LTC6902IMS#PBF pinout, LTC6902IMS#PBF application, or LTC6902IMS#PBF equivalent, key selection criteria include programmable phase count (2/3/4), SSFM enablement via RMOD, ±40ppm/°C temperature stability, fast 50µs–1.5ms start-up, and MSOP-10 package compatibility with space-constrained portable designs.
Technical Context
The LTC6902IMS#PBF integrates a master oscillator whose frequency is set by RSET and scaled by a programmable divider (÷1, ÷10, or ÷100) controlled by the DIV pin. Its multiphase circuit generates synchronized outputs with M = 1 (2-phase), M = 3 (3-phase), or M = 4 (4-phase), directly determining output duty cycle and phase offset.
SSFM is implemented via a 9-bit pseudorandom binary sequence generator driving a multiplying DAC referenced to VSET; modulation depth is set by RMOD and always down-spreads from fMAX. The servo loop bandwidth (~25kHz) filters high-frequency modulation steps, softening transitions for EMI-sensitive applications like DC/DC converter clocking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 5kHz to 20MHz output; selectable via RSET, DIV pin (÷1/÷10/÷100), and PH pin (2-/3-/4-phase) |
| Frequency Accuracy | ≤±1.5% max (5kHz–10MHz, TA = 25°C); enables stable timing without trimming |
| Temp Stability | ±40ppm/°C; ensures <±0.5% drift over –40°C to 85°C operating range |
| SSFM Spreading | Programmable 7.5–45% down-spread via RMOD; reduces peak EMI by spreading spectral energy |
| Supply Current | 400µA typical at 1MHz/3V; supports battery-powered operation with low quiescent draw |
| Start-Up Time | 50µs to 1.5ms; allows rapid system wake-up and dynamic clock enabling |
| Output Drive | 100Ω CMOS drivers; delivers clean 50% duty cycle (2-/4-phase) or 33.3% (3-phase) into 5kΩ/10pF loads |
Pinout & Package
Package: 10-lead MSOP (MS package), 3mm × 3mm, 0.5mm pitch, exposed pad not electrically connected.
| 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 |
| DIV (Pin 2) | Programmable divider select | Three-state: GND = ÷1, open = ÷10, V+ = ÷100; sets master oscillator scaling factor N |
| PH (Pin 3) | Multiphase mode select | Three-state: GND = 2-phase (M=1), open = 3-phase (M=3), V+ = 4-phase (M=4) |
| OUT1–OUT4 (Pins 4–7) | CMOS clock outputs | Phase-aligned waveforms; OUT3/OUT4 inactive in 2-phase mode; all active in 4-phase |
| GND (Pin 8) | Analog/digital ground | Must connect to low-impedance ground plane; shared reference for all internal circuits |
| SET (Pin 10) | Frequency-setting resistor node | Connects to RSET (20kΩ–400kΩ); voltage held at ~1.13V below V+ for accurate ISET current |
| MOD (Pin 9) | SSFM spreading resistor node | Connects to RMOD; disables SSFM when grounded; open pin causes noise susceptibility |
Key Features
| Feature | Design Value |
|---|---|
| 2-/3-/4-phase programmability | Single-pin (PH) selection enables optimal phase count for multi-rail DC/DC synchronization without redesign |
| Spread spectrum modulation | Reduces peak radiated emissions by up to 10dB via pseudorandom down-spread, easing EMC certification |
| Resistor-set frequency & spreading | Eliminates crystal or trimmer capacitors; RSET sets fMAX, RMOD sets % spreading-no digital interface required |
| Wide supply range & low IQ | Operates from 2.7V–5.5V with 400µA typical IQ at 1MHz, supporting both Li-ion and 5V systems |
| Fast, deterministic start-up | 50µs minimum start time enables immediate clock availability after power-on or sleep exit |
Applications
| Switching Power Supply Clock Reference | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Synchronizing multiple buck/boost converters in a PMIC or discrete power tree. IC Role / Device Role / Timing Role: Provides phase-aligned, low-jitter clock signals to gate drivers; SSFM reduces conducted/radiated EMI from switching nodes. Use Value: Enables tighter regulation, lower output ripple, and faster transient response while meeting CISPR-22 Class B emission limits. | Use Scenario: Power management in handheld medical devices or industrial data loggers with strict battery life targets. IC Role / Device Role / Timing Role: Generates low-power, stable clocks for microcontroller peripherals and ADC sampling without crystal load. Use Value: Extends runtime via 400µA IQ and eliminates crystal aging/drift concerns in wide-temperature deployments. |
| Cell Phones / PDAs | Clocking Switched Capacitor Filters |
Use Scenario: Providing timing for RF front-end power amplifiers and envelope tracking modulators. IC Role / Device Role / Timing Role: Delivers precise, low-phase-noise multiphase clocks to synchronize PA bias sequencing and modulation paths. Use Value: Improves ACLR and reduces adjacent channel leakage by minimizing clock-induced jitter on critical RF paths. | Use Scenario: Driving switched-capacitor anti-aliasing or reconstruction filters in audio codecs. IC Role / Device Role / Timing Role: Supplies accurate, low-jitter sampling clocks with matched phase relationships across filter channels. Use Value: Maintains >90dB SNR and prevents harmonic distortion due to duty-cycle and phase skew errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6903IMS#PBF | Same MSOP-10 package; adds internal RSET option and wider 1kHz–68MHz range; no SSFM | Preferred where fixed-frequency precision > EMI reduction; lacks spread spectrum capability | Select LTC6903IMS#PBF when SSFM is unnecessary and extended low-frequency coverage (<5kHz) is required. |
| Si5351A-B-GM | 3-output I²C-programmable clock generator; 2.7–3.6V only; integrated PLL; no SSFM | Suitable for complex multi-frequency systems requiring software-defined clock trees | Choose Si5351A-B-GM when flexible frequency synthesis, multiple independent outputs, or I²C control are mandatory. |
Compared with LTC6903IMS#PBF and Si5351A-B-GM, the LTC6902IMS#PBF uniquely combines hardware-programmable multiphase outputs with analog SSFM control-offering simpler, lower-cost EMI mitigation without MCU intervention or I²C overhead.
Availability
LTC6902IMS#PBF is available at Aetrix Electronics and suitable for switching power supply clock references, portable/battery-powered equipment, cell phones/PDAs, and switched capacitor filter clocking requiring stable component supply across industrial and consumer temperature ranges.
Supply support for LTC6902IMS#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC6902IMS#PBF belongs to ADI's precision timing product line, designed specifically for low-EMI, resistor-configurable clock generation in space- and cost-constrained power management systems.
FAQ
What is the operating temperature range of the LTC6902IMS#PBF?
The LTC6902IMS#PBF is specified for operation from –40°C to +85°C. This industrial-grade temperature range is guaranteed for the "I" grade variant (LTC6902IMS), making it suitable for demanding environments including automotive infotainment power rails and industrial motor drives. The device maintains ≤±2.5% frequency accuracy across this full range when configured per datasheet conditions.
How do I configure the LTC6902IMS#PBF for 4-phase output with 20% SSFM spreading?
To configure the LTC6902IMS#PBF for 4-phase output with 20% SSFM spreading: tie PH (Pin 3) to V+, leave DIV (Pin 2) open for ÷10 division, select RSET to set fMAX (e.g., 20kΩ for 250kHz), and set RMOD = 10kΩ (since % spreading = 20 × RSET/RMOD). Ground MOD only to disable SSFM; never leave it floating.
Does the LTC6902IMS#PBF require an external crystal or resonator?
No, the LTC6902IMS#PBF is a fully self-contained silicon oscillator and does not require any external crystal, resonator, or capacitor. Frequency is set solely by the external RSET resistor; SSFM depth is set by RMOD. This eliminates crystal-related costs, board area, aging effects, and ESD sensitivity inherent in quartz-based solutions.
What is the maximum output frequency achievable with the LTC6902IMS#PBF at 3V supply?
At 3V supply, the LTC6902IMS#PBF supports a maximum output frequency of 10MHz (not 20MHz). This limitation is specified in the datasheet for low-supply applications (2.7V ≤ V+ ≤ 4V). To achieve 10MHz, configure DIV = GND (÷1), PH = GND (2-phase), and use RSET ≈ 20kΩ. Higher frequencies risk degraded accuracy and increased jitter.
Can the LTC6902IMS#PBF drive standard CMOS logic inputs directly?
Yes, the LTC6902IMS#PBF provides 100Ω CMOS output drivers capable of directly driving standard 5kΩ/10pF CMOS loads. Output high/low voltages meet TTL and CMOS logic thresholds across 2.7V–5.5V supply: VOH ≥ 4.4V (at 5V, IOH = –4mA), VOL ≤ 0.4V (at 5V, IOL = 4mA). For heavier loads, add buffering to maintain timing integrity.
LTC6902IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Oscillator, Silicon
- Count:
- -
- Frequency:
- 100kHz ~ 20MHz
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 2.5 mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6902IMS#PBF FAQ
1.How can I place an order for LTC6902IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6902IMS#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 LTC6902IMS#PBF reliable?
The price and inventory of LTC6902IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6902IMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC6902IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6902IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6902IMS#PBF?
LTC6902IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6902IMS#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 LTC6902IMS#PBF?
For technical support, including LTC6902IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6902IMS#PBF requirements.
6.How does Aetrix verify that LTC6902IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6902IMS#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 LTC6902IMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC6902IMS#PBF?
All LTC6902IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6902IMS#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 LTC6902IMS#PBF part is unused and in its original packaging.
Return procedure for LTC6902IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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