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Analog Devices Inc. ADN2847ACPZ-48
- Part No.:
- ADN2847ACPZ-48
- Manufacturer:
- Analog Devices Inc.
- Category:
- Laser Drivers
- Package:
- 48-WFQFN Exposed Pad, CSP
- Datasheet:
-
ADN2847ACPZ-48.pdf
- Description:
- IC LASER DIODE DRIVER 48LFCSP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADN2847ACPZ-48 from Analog Devices is a 3.3 V dual-loop laser diode driver IC for high-speed 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-enabling SONET OC-48 and DWDM dual-MPD wavelength stabilization in telecom line cards.
For engineers reviewing the ADN2847ACPZ-48 datasheet, ADN2847ACPZ-48 pinout, ADN2847ACPZ-48 application, or ADN2847ACPZ-48 equivalent, key selection criteria include its 48-lead LFCSP package, dual MPD support, ALS-triggered shutdown, IDTONE supervisory tone capability, and compliance with ITU-T G.958 transmitter fail/degrade alarms.
Technical Context
The ADN2847ACPZ-48 implements two independent closed-loop control paths: one for average optical power (via PSET/PAVCAP) and one for extinction ratio (via ERSET/ERCAP), both using monitor photodiode feedback. Its dual MPD architecture-exclusive to the 48-lead variant-sums IMPD and IMPD2 currents for power control while enabling independent wavelength tuning via IMPDMON2.
It supports both ac- and dc-coupled laser interfacing, features programmable loop bandwidth selection (LBWSET), integrated alarm generation (FAIL/DEGRADE), and optional clocked data input (CLKSEL). The IDTONE pin provides 2–10% IMOD-level fiber identification tone modulation with 2× gain, requiring an external current sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 50 Mbps to 3.3 Gbps - supports SONET OC-48 (2.488 Gbps) and Gigabit Ethernet physical layer timing |
| Bias Current Range | 2 mA to 100 mA - sets laser threshold and CW output level; ALS forces <0.1 mA shutdown |
| Modulation Current Range | 5 mA to 80 mA - determines optical swing (P1−P0); compliance voltage up to VCC ensures headroom at 3.3 V |
| Rise/Fall Time | 80 ps typical - enables clean 3.3 Gbps eye opening with <15 ps pulse width distortion |
| Monitor PD Input | 50 μA to 1200 μA - accepts MPD current for APC/ERC loops; dual inputs (IMPD/IMPD2) only active in 48-lead package |
| Supply Current | 50 mA typical at 3.3 V - scales with IMOD (ICC ≈ 50 mA + 0.3 × IMOD), limiting thermal load in compact LFCSP |
| Alarm Threshold | Configurable via ASET resistor (1.2–25 kΩ) - sets FAIL at IASET/100, DEGRADE at 90% of that level per ITU-T G.958 |
Pinout & Package
The ADN2847ACPZ-48 is housed in a 48-lead, 7 mm × 7 mm LFCSP package with exposed paddle (EPAD) requiring connection to VCC or GND plane for thermal and electrical integrity. Pin numbering follows standard top-view orientation with Pin 1 indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IMODP / IMODN | Laser modulation current outputs | Differential drive to laser anode/cathode; IMODP connects directly to LD, IMODN ties to VCC via matching resistor |
| IBIAS / CCBIAS | Laser bias current source and coupling control | IBIAS supplies DC bias; CCBIAS tied to VCC (dc-coupled) or IBIAS (ac-coupled) to configure laser interface mode |
| IMPD / IMPD2 | Dual monitor photodiode inputs | Accepts current from primary and secondary MPDs; IMPD2 enables DWDM wavelength control only in 48-lead variant |
| IDTONE | Supervisory tone modulation input | External current sink (50 μA–4 mA) modulates IMOD by 2–10%; causes eye distortion if active during transmission |
| LBWSET / PSET / ERSET / ASET | Analog loop configuration pins | Set loop time constants (LBWSET), average power (PSET), extinction ratio (ERSET), and alarm thresholds (ASET) via external resistors |
| FAIL / DEGRADE / ALS | Alarm status and safety control | Open-drain outputs with 30 kΩ internal pull-up; ALS is active-high shutdown forcing IBIAS/IMOD to <0.1 mA |
Key Features
| Feature | Design Value |
|---|---|
| Dual MPD support | Exclusive to ADN2847ACPZ-48: IMPD2 and IMPDMON2 enable independent wavelength control in DWDM modules without external summing circuitry |
| Closed-loop extinction ratio control | Eliminates need for laser-specific characterization; maintains SONET/SDH-compliant ER across temperature, aging, and device variation |
| Automatic laser shutdown (ALS) | Hardware-level safety feature asserting on command or fault; verified by FAIL alarm activation and <0.1 mA residual IBIAS |
| IDTONE supervisory channel | Provides standardized fiber identification tone (0.01–1 MHz) with 2× gain and user-defined amplitude-replaces discrete tone generators in WDM systems |
| Programmable alarm thresholds | ASET resistor sets FAIL/DEGRADE levels per ITU-T G.958 §10.3.1.1.2–3; hysteresis prevents chatter near trip points |
Applications
| SONET OC-48 Line Card Transmitter | DWDM Dual-MPD Laser Module |
|---|---|
Use Scenario: High-reliability 2.488 Gbps optical link in carrier-class metro transport equipment operating over −40°C to +85°C. IC Role / Device Role / Timing Role: Laser diode driver providing closed-loop APC and ERC, with FAIL/DEGRADE alarms feeding system management MCU. Use Value: Maintains BER <10⁻¹² by stabilizing extinction ratio against laser aging and temperature drift-eliminating manual recalibration cycles. | Use Scenario: Tunable 1550 nm DWDM transmitter where two monitor photodiodes track side-mode suppression and wavelength drift. IC Role / Device Role / Timing Role: Dual-MPD front-end controller using IMPD2/IMPDMON2 to feed wavelength lock algorithm in host DSP. Use Value: Enables real-time wavelength correction without external current mirrors or ADCs-reducing BOM count by 3 components per channel. |
| Fiber Identification Channel | Optical Supervisory System |
Use Scenario: Multi-fiber patch panel with embedded IDTONE tone for automated fiber mapping and loss verification. IC Role / Device Role / Timing Role: IDTONE pin generates low-frequency (10 kHz–1 MHz) optical tone superimposed on data stream for passive detection. Use Value: Allows non-intrusive fiber tracing without interrupting live traffic-tone amplitude adjustable from 2% to 10% of IMOD range. | Use Scenario: Digital calibration of optical parameters in field-deployable transceivers using SPI-controlled digital potentiometers. IC Role / Device Role / Timing Role: PSET/ERSET pins interfaced to ADN2850 dual 10-bit DAC for remote, temperature-stable power/ER adjustment. Use Value: Achieves ±0.1 dB optical power stability over −40°C to +85°C-replacing mechanical potentiometers and reducing calibration labor by 70%. |
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+ | Single-loop architecture; no dual-MPD or IDTONE; 32-pin TQFN; max rate 2.7 Gbps | Lacks extinction ratio control and DWDM wavelength supervision; suited for cost-sensitive 2.5G Ethernet | Select when dual-loop precision and DWDM features are unnecessary and footprint is constrained |
| LMH6570MA/NOPB | DC-coupled 3.3 V laser driver; no APC/ERC loops; no alarm outputs; 16-pin SOIC | Requires external photodiode amplifier and comparator for basic power monitoring | Select only for simple, non-telecom applications where closed-loop control is implemented externally |
Compared with MAX3736AETE+ and LMH6570MA/NOPB, the ADN2847ACPZ-48 uniquely integrates dual-loop optical control, dual-MPD support, and ITU-T-compliant alarms in a single 48-lead LFCSP-reducing system-level component count by up to 11 discrete parts in SONET/DWDM designs.
Availability
ADN2847ACPZ-48 is available at Aetrix Electronics and suitable for SONET OC-48 line cards, DWDM transponder modules, and optical supervisory systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADN2847ACPZ-48 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial applications.
The ADN2847ACPZ-48 belongs to Analog Devices' optical networking driver product line, engineered specifically for SONET/SDH and DWDM infrastructure where closed-loop laser control, reliability, and standards compliance are critical.
FAQ
What is the function of the IDTONE pin on the ADN2847ACPZ-48?
The IDTONE pin on the ADN2847ACPZ-48 provides a dedicated supervisory tone modulation interface for fiber identification. When an external current sink (50 μA to 4 mA) is connected between IDTONE and ground, it injects a 2–10% amplitude-modulated tone onto the IMOD current path with 2× gain. This enables non-intrusive fiber mapping in WDM systems but must be disabled during active data transmission to avoid optical eye degradation, as confirmed in the ADN2847ACPZ-48 datasheet Figure 12 and Section "IDTONE (48-Lead LFCSP Only)".
How does the ADN2847ACPZ-48 implement dual-loop control for power and extinction ratio?
The ADN2847ACPZ-48 uses two independent analog control loops: the average power loop samples IMPD current and adjusts IBIAS via PSET/PAVCAP, while the extinction ratio loop compares P1/P0 ratios derived from IMPD and IMPD2 (48-lead only) and tunes IMOD via ERSET/ERCAP. Both loops operate continuously without host intervention, maintaining SONET/SDH compliance over temperature and laser aging. This dual-loop behavior is explicitly defined in the ADN2847ACPZ-48 Functional Block Diagram (Figure 1), General Description, and Theory of Operation sections.
Why is the ADN2847ACPZ-48 specified only in the 48-lead LFCSP package for dual-MPD functionality?
The ADN2847ACPZ-48's dual-MPD capability-including IMPD2, IMPDMON2, and internal summation for power control-is physically implemented only in the 48-lead LFCSP variant, as confirmed by the Pin Configurations section (Figures 7 and 8), Table 5 (Pin Function Descriptions), and "Dual MPD DWDM Function (48-Lead LFCSP Only)" subsection. The 32-lead version omits these pins entirely; thus, dual-MPD operation is not possible on any other package variant of the ADN2847 family.
What are the absolute maximum ratings for the ADN2847ACPZ-48 supply voltage and operating temperature?
The ADN2847ACPZ-48 has an absolute maximum VCC rating of 4.2 V and an operating temperature range of −40°C to +85°C, as specified in Table 2 (Absolute Maximum Ratings) of the official datasheet Rev. B. Exceeding 4.2 V risks permanent damage; operation outside −40°C to +85°C voids parametric guarantees. The thermal resistance θJA is 25°C/W for the 48-lead LFCSP, meaning die temperature rise is strictly bounded under defined PCB layout conditions.
How does automatic laser shutdown (ALS) interact with the FAIL alarm in the ADN2847ACPZ-48?
In the ADN2847ACPZ-48, asserting ALS (logic high) immediately disables both IBIAS and IMOD outputs, driving them below 0.1 mA, and triggers the FAIL alarm-per ITU-T G.958 §9.7 and §10.3.1.1.2. This behavior is explicitly documented in the "Automatic Laser Shutdown" and "ALARMS" sections. Critically, DEGRADE remains low while FAIL is high during ALS assertion, forming a unique diagnostic signature that distinguishes hardware-initiated shutdown from laser degradation events.
ADN2847ACPZ-48 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-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:
- 48-LFCSP (7x7)
- Mounting Type:
- Surface Mount
ADN2847ACPZ-48 FAQ
1.How can I place an order for ADN2847ACPZ-48 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADN2847ACPZ-48 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-48 reliable?
The price and inventory of ADN2847ACPZ-48 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADN2847ACPZ-48 is usually 5 days.
3.What payment methods are accepted for ADN2847ACPZ-48?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADN2847ACPZ-48 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADN2847ACPZ-48?
ADN2847ACPZ-48 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADN2847ACPZ-48 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-48?
For technical support, including ADN2847ACPZ-48 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADN2847ACPZ-48 requirements.
6.How does Aetrix verify that ADN2847ACPZ-48 is sourced from the original manufacturer or authorized distributors?
All ADN2847ACPZ-48 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-48 meets industry standards.
7.What is the process for return or replacement of ADN2847ACPZ-48?
All ADN2847ACPZ-48 units undergo pre-shipment inspection (PSI). If there is an issue with ADN2847ACPZ-48, 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-48 part is unused and in its original packaging.
Return procedure for ADN2847ACPZ-48:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADN2847ACPZ-48 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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