Features
- Four independent timing channels
- Jitter output below 150fs RMS (typical)
- Digital PLLs (DPLLs) lock to any frequency from 1kHz to 1GHz
- DPLLs/Digitally Controlled Oscillators (DCOs) generate any frequency from 0.5Hz to 1GHz
- DCO outputs can be aligned in phase and frequency with the outputs of any DPLL or DCO
- Supports up to 8 differential or 16 single-ended reference clock inputs
- Supports up to 8 differential outputs or 16 LVCMOS outputs
- Reference monitors qualify/disqualify references depending on LOS, activity, frequency monitoring, and/or LOS input pins
- Automatic reference selection state machines select the active reference for each DPLL based on the reference monitors, priority tables, revertive/non-revertive and other programmable settings
- Device requires a crystal oscillator or fundamental-mode crystal: 25MHz to 54MHz
- Optional XO_DPLL input allows a wider range for XO, TCXO, or OCXO frequencies from 1MHz to 150MHz for applications that require a local oscillator with high stability
- Serial processor ports support 1MHz I²C or 50MHz SPI
- The device can configure itself automatically after reset via:
- Internal Customer-programmable One-Time Programmable memory
- Standard external I²C EPROM via separate I²C Master Port
8A34042 - Block Diagram
Description
The 8A34042 multi-channel Digital PLL/Digitally Controlled Oscillator (DPLL/DCO) provides tools to manage timing references, clock conversion and timing paths for common communications protocols such as Synchronous Ethernet (SyncE), Optical Transport Network (OTN), and Common Public Radio Interface (CPRI). The device can be used to synchronize communication ports on line cards or daughter cards that are connected with synchronization sources across backplanes or other media. Digitally Controlled Oscillators (DCOs) are available to be controlled by OTN clock recovery servo software running on an external processor. Digital PLLs (DPLLs) support filtering of gapped clocks for OTN and hitless reference switching between references from redundant timing sources. The device supports multiple independent timing channels for clock generation; jitter attenuation and universal frequency translation. Input-to-input, input-to-output and output-to-output phase skew can all be precisely managed. The device outputs ultra-low-jitter clocks that can directly synchronize SerDes running at up to 28Gbps; as well as CPRI/OBSAI, SONET/SDH and PDH interfaces.
To see other devices in this product family, visit the ClockMatrix Timing Solutions page.
Parameters
| Attributes | Value |
|---|---|
| Inputs (#) | 14 |
| Input Type | HCSL, LVDS, LVHSTL, LVPECL, SSTL |
| Product Category | ClockMatrix, Ultra-Low Jitter Clocks (<300 fs RMS), Jitter Attenuators, Programmable Clocks |
| Diff. Outputs | 8 |
| Output Type | HSTL, LVCMOS, LVDS, LVHSTL, LVPECL, LVTTL |
| Output Voltage (V) | 1.2V, 1.5V, 1.8V, 2.5V, 3.3V |
| Input Freq (MHz) | 0.001 - 1000 |
| Phase Jitter Typ RMS (ps) | 0.15 |
| Output Freq Range (MHz) | 5.0E-7 - 1000 |
| Fractional Output Dividers (#) | 4 |
| Core Voltage (V) | 2.5V, 3.3V |
| Output Banks (#) | 4 |
| Xtal Freq (KHz) | 25 - 54 |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| VFQFPN | 10.0 x 10.0 x 1.0 | 72 | 0.5 |
| Part Number | Status | Samples | Stock | Package | Budgetary Price (USD) | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Qty. per Reel (#) | Qty. per Carrier (#) | Pb (Lead) Free | Pb Free Category | Temp. Range (°C) | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 8A34042E-000NLG | Active | Available | In Stock | VFQFPN | 1ku | $18.24 | 72# | Tray | 3 | 0 | 168# | Yes | e3 Sn | -40 to 85°C | CHINA | SINGAPORE |
| 8A34042E-000NLG# | Active | N/A | Out of Stock | VFQFPN | 1ku | $18.24 | 72# | Reel | 3 | 2500# | 0 | Yes | e3 Sn | -40 to 85°C | CHINA | SINGAPORE |
| 8A34042E-000NLG8 | Active | N/A | Out of Stock | VFQFPN | 1ku | $18.24 | 72# | Reel | 3 | 2500# | 0 | Yes | e3 Sn | -40 to 85°C | CHINA | SINGAPORE |
| 8A34042B-000NLG | Obsolete | N/A | Out of Stock | VFQFPN | 72# | Tray | 3 | 0 | 168# | Yes | e3 Sn | -40 to 85°C | |||
| 8A34042B-000NLG# | Obsolete | N/A | Out of Stock | VFQFPN | 72# | Reel | 3 | 2500# | 0 | Yes | e3 Sn | -40 to 85°C | |||
| 8A34042B-000NLG8 | Obsolete | N/A | Out of Stock | VFQFPN | 72# | Reel | 3 | 2500# | 0 | Yes | e3 Sn | -40 to 85°C | |||
| 8A34042C-000NLG | Obsolete | N/A | Out of Stock | VFQFPN | 72# | Tray | 3 | 0 | 168# | Yes | e3 Sn | -40 to 85°C | |||
| 8A34042C-000NLG# | Obsolete | N/A | Out of Stock | VFQFPN | 72# | Reel | 3 | 2500# | 0 | Yes | e3 Sn | -40 to 85°C | |||
| 8A34042C-000NLG8 | Obsolete | N/A | Out of Stock | VFQFPN | 72# | Reel | 3 | 2500# | 0 | Yes | e3 Sn | -40 to 85°C |
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- Application NotePDF 244 KB R31AN0062EU0104 Rev.1.04 Sep 22, 2025AI-generated Summary: Selecting the right crystal for ClockMatrix devices is crucial for optimizing performance and minimizing output jitter. Key crystal parameters include frequency (25-54 MHz), load capacitance (recommended 12pF), equivalent series resistance (ESR), drive level (typically 250µW), operating temperature, frequency tolerance, and aging. Crystals with integer frequency relationships reduce jitter in clock generator mode, while avoiding simple integer ratios reduces boundary spurs in jitter attenuator mode. Load capacitance affects frequency stability and oscillator startup. ESR impacts oscillator gain and drive level. Crystal oscillators can replace crystals if the OSCI input is properly overdriven with specified voltage and slew rate. Recommended tuning capacitor values depend on crystal load capacitance. Proper selection ensures stable, low-jitter clock outputs.
- Application NotePDF 196 KB R31AN0083EU0110 Rev.1.10 Aug 13, 2025
- Application NoteAI-generated Summary: Phase noise measurements using Keysight E5052B and Rohde & Schwarz FSWP often require applying filters such as high-pass, low-pass, or band-pass to the captured data. The E5052B uses user-defined equations to apply these filters, while the FSWP employs user-configured weighting filters. Procedures include setting up user equations on the E5052B via the Trace View and Data Math menus, and configuring weighting filters on the FSWP through the MEAS CONFIG and Integrated Meas menus. This enables precise filtering of phase noise data for improved measurement accuracy.
- Application NoteAI-generated Summary: ClockMatrix configurations require careful output placement, crystal frequency selection, and DCO frequency planning to reduce RMS jitter caused by coupling effects. Key coupling types include output-to-output, crystal-to-output, channel-to-channel, and output multiplexor coupling. Boundary spurs arise when PLL fractional divider ratios approach integers, increasing jitter and distortion. Adjacent output frequencies should differ by at least 20MHz to mitigate output-to-output coupling, considering harmonics. The document explains detection and mitigation methods for coupling and provides optimization examples for 72QFN and 144BGA devices.
- Application NotePDF 465 KB R31AN0056EU0100 Rev.1.00 Jul 13, 2023AI-generated Summary: Power supply filtering recommendations focus on minimizing crosstalk and noise coupling among various power domains within ClockMatrix devices. Digital, analog, input, and output power groups require separation by ferrite beads or can be combined under specific conditions to simplify filtering. Two simplified power supply cases provide guidelines for combining or separating power lines based on device models. PSRR tests demonstrate effective noise rejection levels for various power pins, ensuring stable operation. Proper decoupling and bypass capacitors are essential for each power group to maintain signal integrity.
- Product Change NoticePDF 550 KB May 04, 2023
- Release NotePDF 215 KB R31US0026EU0100 Rev.1.00 Apr 18, 2023
- GuidePDF 2.54 MB 8A3xxxx-Family-Programming-Guide-v4.9 Apr 06, 2023
- Application NotePDF 1.57 MB R31AN0043EU0100 Rev.1.00 Mar 28, 2023AI-generated Summary: Phase noise in ClockMatrix devices originates from multiple sources including output dividers, VCO noise, digital in-band noise, and input reference noise such as SyncE or OCXO. The device architecture consists of nested PLL loops, each with programmable bandwidths that shape phase noise differently. Higher quality input references improve close-in phase noise, especially at low frequency offsets. The APLL loop defines the noise floor, with noise shaped by loop bandwidth and frequency, where phase noise increases by 6dB for every frequency doubling. Understanding these contributors helps optimize jitter performance within specific integration bandwidths.
- Application NotePDF 57 KB R31AN0036EU0101 Rev.1.01 Mar 04, 2023AI-generated Summary: ClockMatrix devices support three holdover types: simple holdover, advanced holdover, and manual offset. Simple holdover maintains the last fractional frequency offset but may be affected by noise in wider bandwidths. Advanced holdover uses an additional low-bandwidth filter and a holdover history mechanism to improve stability and reject corrupted values. Manual offset allows direct register setting of holdover frequency. Advanced holdover suits applications requiring high holdover performance, such as telecom standards G.8262 and G.8273. Settling times vary with bandwidth, and users must wait accordingly for stable holdover values.
- Application NotePDF 275 KB R31AN0031EU0101 Rev.1.01 Jan 30, 2023AI-generated Summary: The lock time of the ClockMatrix 8A34xxx series DPLL depends primarily on loop bandwidth (LBW), phase slope limit (PSL), damping factor, lock criteria, input frequency offset, and fastlock bits. Larger LBW shortens lock time, while smaller LBW increases it. Fastlock features like frequency snap and phase snap accelerate lock acquisition. Lab examples demonstrate lock times ranging from milliseconds with high LBW to under 20 seconds for 1PPS inputs with very small LBW. Adjusting input monitors, lock criteria duration, and LBW can optimize lock time, with fastest lock times around 25ms achievable under specific settings.
- Application NotePDF 70 KB R31AN0028EU0100 Rev.1.00 Nov 01, 2022AI-generated Summary: The document explains how to verify that an EEPROM configuration file generated by Timing Commander has been correctly programmed into an EEPROM for ClockMatrix devices. It details the use of two cyclic redundancy check (CRC) calculations—one for the header and one for the payload—to validate the EEPROM contents. The configuration file uses a little-endian format and contains a 12-byte header with a marker string "CMX-CFG", payload length, type, and CRC values. Matching CRC values between the EEPROM and the generated file confirm successful programming. An example of the EEPROM file structure is provided for clarity.
Recommended Documents (1)
Datasheets (1)
- GuidePDF 2.54 MB 8A3xxxx-Family-Programming-Guide-v4.9 Apr 06, 2023
Manuals & Guides (9)
- Application NotePDF 244 KB R31AN0062EU0104 Rev.1.04 Sep 22, 2025AI-generated Summary: Selecting the right crystal for ClockMatrix devices is crucial for optimizing performance and minimizing output jitter. Key crystal parameters include frequency (25-54 MHz), load capacitance (recommended 12pF), equivalent series resistance (ESR), drive level (typically 250µW), operating temperature, frequency tolerance, and aging. Crystals with integer frequency relationships reduce jitter in clock generator mode, while avoiding simple integer ratios reduces boundary spurs in jitter attenuator mode. Load capacitance affects frequency stability and oscillator startup. ESR impacts oscillator gain and drive level. Crystal oscillators can replace crystals if the OSCI input is properly overdriven with specified voltage and slew rate. Recommended tuning capacitor values depend on crystal load capacitance. Proper selection ensures stable, low-jitter clock outputs.
- Application NotePDF 196 KB R31AN0083EU0110 Rev.1.10 Aug 13, 2025
- Application NoteAI-generated Summary: Phase noise measurements using Keysight E5052B and Rohde & Schwarz FSWP often require applying filters such as high-pass, low-pass, or band-pass to the captured data. The E5052B uses user-defined equations to apply these filters, while the FSWP employs user-configured weighting filters. Procedures include setting up user equations on the E5052B via the Trace View and Data Math menus, and configuring weighting filters on the FSWP through the MEAS CONFIG and Integrated Meas menus. This enables precise filtering of phase noise data for improved measurement accuracy.
- Application NoteAI-generated Summary: ClockMatrix configurations require careful output placement, crystal frequency selection, and DCO frequency planning to reduce RMS jitter caused by coupling effects. Key coupling types include output-to-output, crystal-to-output, channel-to-channel, and output multiplexor coupling. Boundary spurs arise when PLL fractional divider ratios approach integers, increasing jitter and distortion. Adjacent output frequencies should differ by at least 20MHz to mitigate output-to-output coupling, considering harmonics. The document explains detection and mitigation methods for coupling and provides optimization examples for 72QFN and 144BGA devices.
- Application NotePDF 465 KB R31AN0056EU0100 Rev.1.00 Jul 13, 2023AI-generated Summary: Power supply filtering recommendations focus on minimizing crosstalk and noise coupling among various power domains within ClockMatrix devices. Digital, analog, input, and output power groups require separation by ferrite beads or can be combined under specific conditions to simplify filtering. Two simplified power supply cases provide guidelines for combining or separating power lines based on device models. PSRR tests demonstrate effective noise rejection levels for various power pins, ensuring stable operation. Proper decoupling and bypass capacitors are essential for each power group to maintain signal integrity.View More (35)
Application Notes & White Papers (35)
- Product Change NoticePDF 550 KB May 04, 2023
- Product Change NoticePDF 113 KB Jun 17, 2021
- Product Change NoticePDF 123 KB Jul 08, 2019
Product Notices (PCN, EOL, etc) (5)
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- Code GeneratorTiming Commander™ is an innovative Windows™-based software platform enabling system design engineers to configure, program, and monitor sophisticated timing devices with an intuitive and flexible graphical user interface (GUI).
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The ClockMatrix family of devices offers high-performance, precision timing solutions for applications with up to 100 Gbps interface speeds. They are versatile in their usage, supporting functions such as clock generation, frequency translation, jitter attenuation, and phase alignment across a range of densities. The 8A3404x Multichannel Digital PLL/DCO family manages timing references and clock conversion for protocols like SyncE, OTN, and CPRI. It features multiple independent timing channels for clock generation, jitter attenuation, and universal frequency translation, outputting ultra-low-jitter clocks for high-speed interfaces like SERDES, CPRI/OBSAI, SONET/SDH, and PDH.
Introducing the IDT ClockMatrix™ family of devices - high-performance, precision timing solutions designed to simplify clock designs for applications with up to 100 Gbps interface speeds.
They can be used anywhere in a system to perform critical timing functions, such as clock generation, frequency translation, jitter attenuation and phase alignment. A range of devices in the family support BBU, OTN, SyncE, synthesizer and jitter attenuator applications with several density options for each.
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