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Analog Devices Inc. ADN2847ACPZ-32-RL7
- Part No.:
- ADN2847ACPZ-32-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Laser Drivers
- Package:
- 32-WFQFN Exposed Pad, CSP
- Datasheet:
-
ADN2847ACPZ-32-RL7.pdf
- Description:
- IC LASER DRVR 3.3GB 3.6V 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,099
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Product details
Overview
ADN2847ACPZ-32-RL7 from Analog Devices is a 3.3 V dual-loop laser diode driver IC for optical transmitters, supporting data rates from 50 Mbps to 3.3 Gbps. It delivers bias current (2–100 mA), modulation current (5–80 mA), and photodiode monitoring (50–1200 μA) with closed-loop control of average optical power and extinction ratio. Used in SONET OC-48/SDH STM-16 fiber-optic line cards.
For engineers reviewing the ADN2847ACPZ-32-RL7 datasheet, ADN2847ACPZ-32-RL7 pinout, ADN2847ACPZ-32-RL7 application, or ADN2847ACPZ-32-RL7 equivalent, key selection criteria include its 32-lead LFCSP package, dual MPD support (not implemented in this variant), ALS alarm interface, and compliance with ITU-T G.958 transmitter fail/degrade requirements.
Technical Context
The ADN2847ACPZ-32-RL7 implements two independent closed-loop control systems: one for average optical power (via PSET and PAVCAP) and another for extinction ratio (via ERSET and ERCAP). Loop bandwidth is selectable via LBWSET pin (high = 0.22–2.25 sec time constant; low = optimized for 2.5–3.3 Gbps).
It features full current parameter monitoring (IBMON, IMMON, IMPDMON), programmable laser fail/degrade alarms (driven by ASET resistor), and automatic laser shutdown (ALS) with 5 μs assertion time. Input data/clock paths are AC-coupled differential (DATAP/DATAN, CLKP/CLKN) with 50 Ω single-ended impedance and <15 ps pulse width distortion at 40 mA IMOD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 50 Mbps to 3.3 Gbps - supports SONET OC-48 and SDH STM-16 line rates without retiming. |
| Bias Current Range | 2 mA to 100 mA - sets laser threshold and DC optical output level; compliance voltage up to VCC. |
| Modulation Current Range | 5 mA to 80 mA - controls optical swing (P1–P0); 80 ps typical rise/fall time enables clean 3.3 Gbps eye opening. |
| Monitor PD Current | 50 μA to 1200 μA - feeds closed-loop power/ER control; mirrored as IMPDMON for external monitoring. |
| Supply Current | 50 mA typical at 3.3 V - includes quiescent + modulation current contribution (ICC ≈ 50 mA + 0.3 × IMOD). |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade optical module deployment in telecom chassis. |
| Package | 32-lead LFCSP (5 mm × 5 mm) - thermally enhanced exposed pad; θJA = 32°C/W for thermal management. |
Pinout & Package
ADN2847ACPZ-32-RL7 uses a 32-lead lead-frame chip-scale package (LFCSP) with 5 mm × 5 mm footprint and exposed thermal pad. Pin 1 is marked by dot; exposed pad must be connected to VCC or GND plane per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBWSET (Pin 1) | Loop Bandwidth Select | Logic input: high = continuous mode (0.22–2.25 sec); low = optimized for 2.5–3.3 Gbps (shorter time constant). |
| ASET (Pin 2) | Alarm Threshold Set | Analog input: sets FAIL/DEGRADE thresholds via resistor to GND; 1.2–1.3 V operating range. |
| ERSET (Pin 3) | Extinction Ratio Set | Analog input: configures closed-loop ER target via resistor; internal 1.2 V reference. |
| PSET (Pin 4) | Average Power Set | Analog input: sets target average optical power via resistor; internal 1.2 V reference. |
| IMPD (Pin 5) | Monitor Photodiode Input | Current input: accepts MPD anode current (50–1200 μA); primary feedback for APC loop. |
| IMPDMON (Pin 6) | MPD Mirror Output | Current source: 1× replica of IMPD for external monitoring or digital supervision (e.g., ADN2850). |
| GND4 (Pin 7) | Supply Ground | Dedicated ground return for analog monitor path; separate from digital/power grounds per layout best practice. |
| VCC4 (Pin 8) | Supply Voltage | 3.0–3.6 V analog supply rail; bypass with 100 nF + 10 nF capacitors close to pin. |
| ERCAP (Pin 9) | ER Loop Capacitor | External capacitor connection: sets extinction ratio loop stability; 1 μF (continuous) or 22 nF (optimized). |
| PAVCAP (Pin 10) | Power Loop Capacitor | External capacitor connection: sets average power loop stability; matches ERCAP value. |
| VCC1 (Pin 11) | Supply Voltage | 3.0–3.6 V digital/analog supply; shares same rail as VCC4 but requires local decoupling. |
| DATAN (Pin 12) | Data Negative Input | Differential AC-coupled data input; 50 Ω termination internal; 100–500 mV p-p compatible. |
| DATAP (Pin 13) | Data Positive Input | Differential AC-coupled data input; complements DATAN; common-mode voltage set internally. |
| GND1 (Pin 14) | Supply Ground | Digital ground return; isolated from analog grounds to minimize noise coupling into control loops. |
| CLKP (Pin 15) | Clock Positive Input | Differential clock input used only when CLKSEL = VCC; otherwise ignored. |
| CLKN (Pin 16) | Clock Negative Input | Differential clock input complement; internal 100 Ω termination between CLKP/CLKN. |
| CCBIAS (Pin 32) | Bias Current Coupling | Connect to VCC for DC-coupled LD; tie to IBIAS for AC-coupled LD configuration. |
| IBIAS (Pins 31, 46–47) | Laser Bias Output | High-current analog output (2–100 mA); connects directly to LD cathode in DC-coupled mode. |
| IMODP (Pins 28, 42–43) | Modulation Positive Output | High-speed modulation current sink (5–80 mA); connects to LD anode in standard configuration. |
| IMODN (Pins 26, 39–40) | Modulation Negative Output | Complementary modulation sink; tied to VCC via matching resistor for proper current steering. |
| ALS (Pin 20) | Automatic Laser Shutdown | Active-high logic input: asserts within 5 μs to disable IBIAS/IMOD and trigger FAIL alarm. |
| FAIL (Pin 19) | Laser Fail Alarm Output | Open-drain active-high output with 30 kΩ internal pull-up; signals end-of-life or ALS activation. |
| DEGRADE (Pin 18) | Laser Degrade Alarm Output | Open-drain active-high output; asserts at 90% of ASET threshold to warn of impending failure. |
| CLKSEL (Pin 17) | Clock Select | Logic input: high = use external clock (CLKP/CLKN); low = use internal data edge-triggered timing. |
| IBMON (Pin 24) | Bias Current Mirror | 100× scaled replica of IBIAS (e.g., 100 mA → 1 mA); used for precision bias monitoring. |
| IMMON (Pin 23) | Modulation Current Mirror | 100× scaled replica of IMOD (e.g., 80 mA → 0.8 mA); enables real-time modulation tracking. |
| VCC2/VCC3 (Pins 25, 30) | Supply Voltage | Additional 3.0–3.6 V supply pins; all VCC pins must be shorted together per datasheet. |
| GND2/GND3 (Pins 27, 31, 41, 44–45) | Supply Ground | Multiple dedicated ground pins; required for low-noise operation and thermal dissipation via exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Dual closed-loop control | Simultaneous regulation of average optical power and extinction ratio eliminates need for external compensation networks. |
| Programmable laser alarms | FAIL and DEGRADE outputs comply with ITU-T G.958 section 10.3.1.1.2/10.3.1.1.3 for SONET/SDH transmitter monitoring. |
| Full current mirroring | IBMON (100×), IMMON (100×), IMPDMON (1×) enable real-time diagnostics without signal path disruption. |
| ALS with fast response | 5 μs shutdown assertion ensures rapid laser disable during fault conditions, meeting safety-critical system requirements. |
| AC/DC coupling flexibility | CCBIAS pin allows seamless transition between AC-coupled (high-current) and DC-coupled (low-jitter) laser interfaces. |
Applications
| SONET/SDH Line Cards | Fibre Channel Transceivers |
|---|---|
Use Scenario: 2.5 Gbps OC-48/STM-16 line interface in carrier-grade optical transport equipment. IC Role / Device Role / Timing Role: Laser diode driver providing closed-loop APC and ER control to maintain BER <10⁻¹² over temperature and aging. Use Value: Eliminates manual calibration and external DACs; meets GR-468 reliability requirements for 25-year deployments. | Use Scenario: 2.125 Gbps Fibre Channel SFP modules for enterprise storage area networks. IC Role / Device Role / Timing Role: High-fidelity modulation driver with <15 ps pulse width distortion ensuring clean eye opening at FC-2 layer. Use Value: Enables plug-and-play interoperability across vendor platforms while maintaining Class I laser safety compliance. |
| Gigabit Ethernet PHY | DWDM Coarse Wavelength Control |
Use Scenario: 1.25 Gbps 1000BASE-SX/X transceivers in enterprise switches and routers. IC Role / Device Role / Timing Role: Low-jitter (1 ps RMS random jitter) driver supporting IEEE 802.3z specifications for multimode fiber links. Use Value: Reduces system-level margin loss; achieves >30 dB extinction ratio stability over −40°C to +85°C without recalibration. | Use Scenario: Dual-MPD wavelength stabilization in C-band DWDM tunable lasers (note: dual MPD functionality is not available in 32-lead variant). IC Role / Device Role / Timing Role: Single-MPD optical supervisor enabling coarse channel locking via PSET/ERSET potentiometer tuning. Use Value: Supports ±0.5 nm wavelength drift compensation using analog feedback-no FPGA or microcontroller required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar laser diode driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3736AETE+T | Single-loop APC only; no closed-loop ER control; 3.135–3.465 V supply; 28-pin TQFN. | Limited to applications where ER is fixed or externally managed; lower integration reduces BOM count but increases design complexity. | Select when ER stability is less critical than cost or board space; verify compatibility with existing 28-pin footprint. |
| LMH6570MA/NOPB | Wideband current-output amplifier (not a full LDD); no integrated APC/ER loops, alarms, or ALS; 16-pin SOIC. | Requires external DACs, comparators, and control logic; suitable for custom analog control architectures only. | Choose only for highly specialized designs needing >5 GHz bandwidth or non-standard bias/modulation topologies. |
Compared with MAX3736AETE+T and LMH6570MA/NOPB, the ADN2847ACPZ-32-RL7 provides complete dual-loop optical control in a single IC, reducing system-level calibration effort and improving long-term wavelength stability-critical for SONET/SDH compliance without firmware intervention.
Availability
ADN2847ACPZ-32-RL7 is available at Aetrix Electronics and suitable for SONET OC-48 line cards, Fibre Channel SFP modules, and Gigabit Ethernet transceivers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for ADN2847ACPZ-32-RL7 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 communications, industrial, and automotive markets since 1965.
The ADN2847ACPZ-32-RL7 belongs to Analog Devices' optical networking product line, designed specifically for high-reliability, temperature-stable laser diode control in telecom infrastructure equipment.
FAQ
What is the maximum data rate supported by the ADN2847ACPZ-32-RL7?
The ADN2847ACPZ-32-RL7 supports data rates from 50 Mbps up to 3.3 Gbps. This range covers SONET OC-48 (2.488 Gbps), SDH STM-16 (2.488 Gbps), and 1000BASE-SX (1.25 Gbps) standards. Performance is verified with 11110000 pattern testing at 2.5 Gbps into 25 Ω load, delivering 80 ps typical rise/fall time and <15 ps pulse width distortion.
Does the ADN2847ACPZ-32-RL7 support dual monitor photodiodes (dual MPD)?
No, the ADN2847ACPZ-32-RL7 does not support dual MPD functionality. That feature is exclusive to the 48-lead LFCSP variant (e.g., ADN2847ACPZ-48-RL7). The 32-lead package omits IMPD2, IMPDMON2, and IDTONE pins, limiting it to single-MPD closed-loop control for average power and extinction ratio.
How is the extinction ratio controlled in the ADN2847ACPZ-32-RL7?
The ADN2847ACPZ-32-RL7 implements closed-loop extinction ratio control using the ERSET pin and ERCAP capacitor. A resistor connected between ERSET and ground sets the target ER value (P1/P0), while ERCAP stabilizes the control loop. The internal circuit continuously adjusts bias and modulation currents to maintain the programmed ER across temperature, aging, and device variation-meeting SONET/SDH compliance without manual recalibration.
What is the purpose of the CCBIAS pin on the ADN2847ACPZ-32-RL7?
The CCBIAS pin on the ADN2847ACPZ-32-RL7 configures the laser diode coupling method: connect CCBIAS to VCC for DC-coupled operation (direct LD connection), or tie CCBIAS to IBIAS for AC-coupled operation (capacitor-isolated LD interface). This flexibility allows optimization for either low-jitter performance (DC) or high-current drive capability (AC), depending on laser diode characteristics and system requirements.
Can the ADN2847ACPZ-32-RL7 operate with a 2.5 V supply?
No, the ADN2847ACPZ-32-RL7 requires a minimum supply voltage of 3.0 V and operates over 3.0 V to 3.6 V. Operation below 3.0 V is outside specification and may result in degraded bias/modulation current accuracy, failed alarm assertion, or unstable loop control. Systems using 2.5 V rails must implement a dedicated 3.3 V LDO or DC-DC converter to power the ADN2847ACPZ-32-RL7.
ADN2847ACPZ-32-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Laser Diode Driver
- Data Rate:
- 3.3Gbps
- Number of Channels:
- 1
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 50 mA
- Current - Modulation:
- 80mA
- Current - Bias:
- 100 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-LFCSP-WQ (5x5)
- Mounting Type:
- Surface Mount
ADN2847ACPZ-32-RL7 FAQ
1.How can I place an order for ADN2847ACPZ-32-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADN2847ACPZ-32-RL7 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 ADN2847ACPZ-32-RL7 reliable?
The price and inventory of ADN2847ACPZ-32-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADN2847ACPZ-32-RL7 is usually 5 days.
3.What payment methods are accepted for ADN2847ACPZ-32-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADN2847ACPZ-32-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADN2847ACPZ-32-RL7?
ADN2847ACPZ-32-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADN2847ACPZ-32-RL7 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 ADN2847ACPZ-32-RL7?
For technical support, including ADN2847ACPZ-32-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADN2847ACPZ-32-RL7 requirements.
6.How does Aetrix verify that ADN2847ACPZ-32-RL7 is sourced from the original manufacturer or authorized distributors?
All ADN2847ACPZ-32-RL7 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 ADN2847ACPZ-32-RL7 meets industry standards.
7.What is the process for return or replacement of ADN2847ACPZ-32-RL7?
All ADN2847ACPZ-32-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADN2847ACPZ-32-RL7, 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 ADN2847ACPZ-32-RL7 part is unused and in its original packaging.
Return procedure for ADN2847ACPZ-32-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADN2847ACPZ-32-RL7 Tags
-
EPC21701
EPC
-
EPC21601
EPC
-
MAX3799ETJ+T
Analog Devices Inc./Maxim Integrated
-
AD9665ACPZ-REEL7
Analog Devices Inc.
-
MAX3740AETG+T
Analog Devices Inc./Maxim Integrated
-
MAX3795ETG+
Analog Devices Inc./Maxim Integrated
-
EPC21603
EPC
-
ONET8501VRGPT
Texas Instruments
-
MAX3738ETG+T
Analog Devices Inc./Maxim Integrated
-
SY88022ALMG-TR
Microchip Technology
-
ISL78365ARZ-T7A
Renesas
-
EPC21603ENGRT
EPC
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