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Analog Devices Inc. LTC6908CDCB-2#TRPBF
- Part No.:
- LTC6908CDCB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC6908CDCB-2#TRPBF.pdf
- Description:
- IC OSC SILICON PROG 6-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,593
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Product details
Overview
LTC6908CDCB-2#TRPBF from Analog Devices is a precision dual-output quadrature oscillator IC designed for clock synchronization in multi-phase switching regulators. It delivers 0°/90° phase-shifted rail-to-rail square wave outputs, programmable from 50kHz to 10MHz via a single external resistor (RSET), with ±10% spread spectrum frequency modulation (SSFM) for EMC improvement, and operates from 2.7V to 5.5V.
For engineers reviewing the LTC6908CDCB-2#TRPBF datasheet, LTC6908CDCB-2#TRPBF pinout, LTC6908CDCB-2#TRPBF application, or LTC6908CDCB-2#TRPBF equivalent, key selection considerations include quadrature output phase alignment, SSFM modulation rate selection (fOUT/16, fOUT/32, fOUT/64), temperature-stable frequency accuracy (±1.5% max at 25°C, 3V), 260µs typical start-up time at 1MHz, and DFN-6 (2mm × 3mm) package compatibility with high-density PCB layouts.
Technical Context
The LTC6908CDCB-2#TRPBF implements a master oscillator architecture where fMASTER = 20MHz • 10k/RSET, divided by 2 to yield fOUT = 10MHz • 10k/RSET. Its SET pin maintains ~1.13V below V+, enabling accurate current-based frequency control independent of absolute voltage reference precision.
SSFM is generated via a 15-bit pseudorandom noise (PRN) sequence driving a 7-bit MDAC, low-pass filtered to fOUT/N (N = 16/32/64), producing bounded ±10% frequency deviation with smoothed transitions suitable for regulator loop stability. Outputs are muted for 64 cycles at power-up and feature 50% duty cycle with <10ns rise/fall times at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Quadrature (0°/90° phase shift) - enables four-phase clocking when paired with dual-output regulators |
| Frequency Range | 50kHz to 10MHz - set by single RSET (20k–2MΩ); accuracy degrades above 5MHz if V+ < 4V |
| SSFM Spreading | Fixed ±10% center frequency deviation - reduces peak EMI by spreading spectral energy across ~20% bandwidth |
| Supply Current | 400µA typical at 50kHz/5V - ultra-low quiescent draw supports battery-powered systems |
| Frequency Accuracy | ≤ ±1.5% max at TA = 25°C, V+ = 3V - guaranteed over 0°C to 70°C operating range per CDCB grade |
| Temp Stability | ±40ppm/°C - ensures minimal drift across industrial ambient conditions |
| Start-Up Time | 260µs typical at 1MHz - fast enable supports dynamic power sequencing |
Pinout & Package
Package: 6-lead (2mm × 3mm) plastic DFN with exposed pad (Pin 7 = GND), 0°C to 70°C operating temperature range (CDCB grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts 2.7V–5.5V; requires local 0.1µF bypass to ground plane for noise immunity |
| GND | Ground reference | Must connect exposed pad (Pin 7) to PCB ground plane for thermal and electrical performance |
| SET | Frequency-setting resistor node | Internal ~1.13V below V+; connects to RSET (20k–2MΩ) for precise fOUT programming |
| OUT1 | Primary oscillator output | CMOS rail-to-rail square wave; drives 5kΩ/10pF loads directly; 0° phase reference |
| OUT2 | Secondary oscillator output | CMOS rail-to-rail square wave; 90° phase-shifted relative to OUT1 for quadrature timing |
| MOD | Spread spectrum control input | Three-state logic: GND = fOUT/16, float = fOUT/32, V+ = fOUT/64; tied to OUTx disables SSFM |
Key Features
| Feature | Design Value |
|---|---|
| Quadrature output topology | Enables precise 0°/90°/180°/270° clock phasing for four-phase synchronous buck converters without external delay networks |
| Single-resistor frequency programming | Eliminates need for trim pots or DACs; RSET tolerance directly maps to fOUT error - simplifies BOM and layout |
| Configurable SSFM modulation rate | Three discrete rates (fOUT/16, fOUT/32, fOUT/64) allow optimization for EMI test bandwidths or system-level noise sensitivity |
| Power-on output muting | 64-cycle blanking ensures first valid edge occurs only after oscillator stabilization - prevents false triggering in downstream logic |
| Low-voltage operation | Functional down to 2.7V supports 3.3V and Li-ion battery-powered designs without level-shifting |
Applications
| Switching Regulator Clocking | EMI-Sensitive Portable Systems |
|---|---|
Use Scenario: Synchronizing two dual-output DC/DC controllers in a quad-phase VRM for CPU/GPU power delivery. IC Role / Device Role / Timing Role: LTC6908CDCB-2#TRPBF provides four precisely phased clocks (0°, 90°, 180°, 270°) to stagger MOSFET switching and minimize input/output ripple current peaks. Use Value: Reduces RMS input current by >40% and cuts conducted EMI by up to 15dB compared to single-phase clocking - easing compliance with CISPR 32 Class B limits. |
Use Scenario: Clock source for a handheld medical monitor with stringent radiated emissions requirements. IC Role / Device Role / Timing Role: LTC6908CDCB-2#TRPBF drives the main PMIC's switching regulators while enabling SSFM to suppress narrowband peaks in 30–1000MHz radiated scans. Use Value: Achieves 6–10dB reduction in peak field strength at fundamental and harmonic frequencies - avoids costly shielding or filter redesign. |
| Battery-Powered Sensor Nodes | Industrial PLC Timing Modules |
Use Scenario: Low-power IoT sensor node using synchronous buck converter for MCU and RF transceiver supply. IC Role / Device Role / Timing Role: LTC6908CDCB-2#TRPBF supplies 2MHz clock with SSFM enabled (MOD = GND) to reduce switching noise coupling into analog sensor front-end. Use Value: Maintains 12-bit ADC SNR >70dB while extending battery life via 400µA quiescent current and elimination of external clock buffers. |
Use Scenario: Timing reference in DIN-rail mounted programmable logic controller requiring stable clock under wide ambient temperature swings. IC Role / Device Role / Timing Role: LTC6908CDCB-2#TRPBF generates 1MHz quadrature clocks for isolated gate drivers in motor control IGBT modules. Use Value: ±40ppm/°C tempco and ±1.5% accuracy over 0°C–70°C ensure deterministic PWM timing across operating range - critical for torque ripple minimization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6908IDCB-2#TRPBF | Wider operating temperature range (–40°C to 85°C) vs. CDCB's 0°C to 70°C; identical pinout, specs, and SSFM behavior | Suitable for automotive under-hood or outdoor industrial deployments where extended cold-start capability is required | Select when full industrial temperature coverage is mandatory; otherwise CDCB offers cost and qualification advantage for commercial-grade systems |
| Si5351A-B-GM | Programmable I²C clock generator with 3 outputs, 8kHz–200MHz range; no integrated SSFM - requires external firmware control for spread spectrum | Supports multi-frequency synthesis and dynamic reconfiguration; lacks native hardware SSFM circuitry and quadrature phase guarantee | Choose for systems needing >2 outputs or frequency agility; avoid when deterministic quadrature + hardware SSFM is required for EMI certification |
Compared with LTC6908IDCB-2#TRPBF and Si5351A-B-GM, the LTC6908CDCB-2#TRPBF delivers purpose-built quadrature timing with integrated, pin-configurable SSFM - eliminating firmware dependencies and ensuring phase accuracy without calibration, making it optimal for fixed-frequency EMI-critical power applications.
Availability
LTC6908CDCB-2#TRPBF is available at Aetrix Electronics and suitable for switching regulator clocking, EMI-sensitive portable systems, battery-powered sensor nodes, and industrial PLC timing modules requiring stable component supply and consistent parametric performance across production lots.
Supply support for LTC6908CDCB-2#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC6908 family was engineered specifically for precision clock generation in multi-phase power conversion systems, emphasizing low-jitter quadrature outputs, hardware-controlled SSFM, and robust operation across commercial temperature ranges.
FAQ
What is the guaranteed operating temperature range for LTC6908CDCB-2#TRPBF?
The LTC6908CDCB-2#TRPBF is specified for 0°C to 70°C operation (commercial grade). While functional from –40°C to 85°C, only the 0°C to 70°C range is fully tested and guaranteed per datasheet specifications. This distinguishes it from the IDCB variant, which guarantees –40°C to 85°C performance.
How does the MOD pin configure spread spectrum modulation on LTC6908CDCB-2#TRPBF?
On the LTC6908CDCB-2#TRPBF, the MOD pin selects SSFM rate via three states: grounded → fOUT/16 modulation, floating (with 1nF bypass) → fOUT/32, tied to V+ → fOUT/64. Connecting MOD to either OUT1 or OUT2 disables SSFM entirely. The internal PRN generator and low-pass filter ensure smooth frequency transitions compatible with regulator control loops.
Can LTC6908CDCB-2#TRPBF drive switching regulator SYNC pins directly?
Yes - the LTC6908CDCB-2#TRPBF outputs are CMOS rail-to-rail with 50% duty cycle, 6ns rise/fall times (5V), and drive capability sufficient for standard SYNC/EXTCLK inputs on Analog Devices regulators (e.g., LTC33xx, LTC38xx families). No level-shifting or buffering is needed for direct interface.
What is the maximum recommended RSET value for LTC6908CDCB-2#TRPBF?
The maximum RSET value for LTC6908CDCB-2#TRPBF is 2MΩ, corresponding to a minimum output frequency of 50kHz at 5V supply. At lower supplies (e.g., 2.7V), RSET should not exceed 400kΩ to maintain ≤±2.5% frequency accuracy - per Electrical Characteristics table limits for |ΔfOUT| ≤ 2.5%.
Does LTC6908CDCB-2#TRPBF support complementary (180°) outputs?
No - LTC6908CDCB-2#TRPBF is the -2 variant and provides only quadrature (0°/90°) outputs. The complementary (0°/180°) configuration is exclusive to the -1 variants (e.g., LTC6908CDCB-1#TRPBF). Pinout, package, and all other electrical specs are identical between -1 and -2 versions.
LTC6908CDCB-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Oscillator, Silicon
- Count:
- -
- Frequency:
- 50kHz ~ 10MHz
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 1.25 mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 6-DFN (2x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6908CDCB-2#TRPBF FAQ
1.How can I place an order for LTC6908CDCB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6908CDCB-2#TRPBF 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 LTC6908CDCB-2#TRPBF reliable?
The price and inventory of LTC6908CDCB-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6908CDCB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6908CDCB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6908CDCB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6908CDCB-2#TRPBF?
LTC6908CDCB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6908CDCB-2#TRPBF 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 LTC6908CDCB-2#TRPBF?
For technical support, including LTC6908CDCB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6908CDCB-2#TRPBF requirements.
6.How does Aetrix verify that LTC6908CDCB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6908CDCB-2#TRPBF 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 LTC6908CDCB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6908CDCB-2#TRPBF?
All LTC6908CDCB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6908CDCB-2#TRPBF, 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 LTC6908CDCB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC6908CDCB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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