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Analog Devices Inc./Maxim Integrated DS1884AT+
- Part No.:
- DS1884AT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
DS1884AT+.pdf
- Description:
- IC INTERFACE SPECIALIZED 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,974
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Product details
Overview
DS1884AT+ from Maxim Integrated is a dedicated SFP and PON ONU controller IC with digital LDD interface, designed to manage laser bias, modulation current, APC set-point, and RSSI-based LOS detection in optical transceivers. It integrates a 13-bit ADC for VCC, temperature, laser bias, laser power, and differential receive power monitoring, plus a 9-bit temperature-compensated DAC for APD bias control. It supports SFF-8472 compliance and operates with MAX3710/MAX3945 companion ICs in GPON/10G-PON ONU modules.
For engineers reviewing the DS1884AT+ datasheet, DS1884AT+ pinout, DS1884AT+ application, or DS1884AT+ equivalent, this device is critical for SFP/SFP+/PON transceiver firmware integration, dual-closed-loop laser calibration, I²C-based module management, and fault-aware optical power monitoring in telecom access networks.
Technical Context
The DS1884AT+ implements three configurable laser control modes-dual closed-loop (bias + modulation), APC-only loop, and open-loop-each using temperature lookup tables (LUTs) for calibration compensation. Its 13-bit ADC provides internal/external calibration support for laser bias, laser power, and differential RSSI, with alarm/warning flags per channel and scalable dynamic range.
A dedicated 3-wire master interface communicates with MAX3710 laser drivers and MAX3945 limiting amplifiers, while an I²C-compatible slave interface handles host-side configuration and telemetry. The device includes 256-byte A0h and 128-byte A2h EEPROM for SFF-8472 memory map storage and supports flexible password-based security across three access levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 13-bit resolution enables precise monitoring of laser bias, modulation current, and receive power with ±0.5% full-scale accuracy after calibration. |
| DAC Resolution | 9-bit temperature-compensated DAC delivers stable APD bias voltage control across -40°C to +85°C operating range. |
| Laser Control Modes | Three modes: dual closed-loop (auto-bias + auto-modulation), APC loop (auto-bias only), and open-loop (LUT-driven bias/modulation). |
| Interface Types | I²C slave (SFF-8472 compliant) + dedicated 3-wire master interface for MAX3710/MAX3945 communication. |
| EEPROM Capacity | 256-byte A0h memory + 128-byte A2h upper memory for SFF-8472 page 0–3 data, calibration LUTs, and security passwords. |
| Monitoring Channels | Monitors VCC, internal die temperature, laser bias current, laser output power, and differential RSSI with independent alarm/warning thresholds. |
| LOS Detection | Continuously monitors RSSI for loss-of-signal generation with maskable warning/alarm flags and dual-range enhanced RSSI functionality. |
Pinout & Package
DS1884AT+ is housed in a 24-pin TSSOP package (5.0mm × 6.5mm, 0.65mm pitch) with exposed thermal pad for improved heat dissipation in high-density SFP modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input | 3.3V ±5% main power rail; powers core logic, ADC, DAC, and I/O buffers. |
| GND | Ground reference | Analog/digital common ground plane; critical for ADC/DAC accuracy and noise immunity. |
| SCL | I²C clock input | Supports standard/fast-mode I²C up to 400kHz for host communication and SFF-8472 register access. |
| SDA | I²C data bidirectional | Open-drain interface for reading/writing A0h/A2h memory pages and status registers. |
| TXD / TXDOUT | Transmit disable input/output | Active-low control for laser shutdown; bidirectional for status feedback to host microcontroller. |
| LOS / LOSOUT | Loss-of-signal input/output | Indicates RSSI below threshold; open-drain output drives host interrupt or status LED. |
| RSEL | Rate select input | Configures operating mode (e.g., GPON vs. EPON) via hardware pin; sets internal scaling and LUT selection. |
| IN1 / TXF | Status/fault monitor input | Accepts external fault signals (e.g., MAX3710 FAULT pin); triggers internal alarm reporting and status flag updates. |
Key Features
| Feature | Design Value |
|---|---|
| SFF-8472 Compliance | Fully implements all control and monitoring requirements for SFP/SFP+ modules, including memory map, alarm/warning thresholds, and real-time telemetry. |
| Dual Closed-Loop Calibration | Uses separate BIAS and MODULATION LUTs with temperature indexing to maintain laser stability across operating conditions without manual recalibration. |
| Differential RSSI Input | Accepts true differential receive signal (e.g., from MAX3945) with common-mode rejection up to VCC, enabling accurate low-light power measurement. |
| Flexible Security Architecture | Three-tier password scheme (PW1/PW2/PW_ENx) protects EEPROM writes, LUT updates, and critical register access against unauthorized modification. |
| Enhanced Fault System | Maskable alarm/warning flags per monitored parameter (VCC, temp, TXB, TXP, RSSI), with status register aggregation for rapid host polling. |
Applications
| GPON ONU Module | 10G-PON ONU Module |
|---|---|
Use Scenario: Fiber-to-the-home (FTTH) optical network unit receiving downstream 1490nm and transmitting upstream 1310nm signals. IC Role / Device Role / Timing Role: Primary controller managing laser bias/modulation, APC tracking, RSSI-based LOS, and SFF-8472 telemetry for interoperability with OLT. Use Value: Enables single-chip compliance with ITU-T G.984/G.987 standards, reducing BOM count and simplifying firmware calibration for field-deployed ONUs. |
Use Scenario: Next-generation 10G-PON ONU supporting symmetric 10Gbps upstream/downstream over single fiber. IC Role / Device Role / Timing Role: Real-time laser power leveling and temperature-compensated APD bias control to meet stringent 10G-PON optical budget and extinction ratio requirements. Use Value: Maintains <±0.5dB optical power stability across -40°C to +85°C, ensuring BER compliance under varying environmental stress. |
| SFP+ Transceiver | EPON ONU Module |
Use Scenario: 10G Ethernet SFP+ pluggable module used in enterprise switches and data center top-of-rack systems. IC Role / Device Role / Timing Role: Host-facing SFF-8472 manager coordinating with MAX3710 driver and limiting amplifier to implement digital diagnostic monitoring (DDM). Use Value: Delivers real-time temperature, voltage, bias, TX power, and RX power data via standardized I²C interface, enabling predictive maintenance and hot-swap validation. |
Use Scenario: Cost-sensitive EPON ONU deployed in metro-access networks requiring robust LOS detection and low-power operation. IC Role / Device Role / Timing Role: Low-voltage analog front-end with Power-On Analog (POA) feature enabling fast RSSI acquisition at startup before full digital initialization. Use Value: Reduces time-to-link by >30% versus legacy controllers, accelerating service activation in large-scale FTTx rollouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SFP/PON controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3658ETE+ | Single-function laser bias controller (no integrated ADC/DAC for RSSI or APD bias); lacks SFF-8472 memory map and I²C slave interface. | Requires external MCU for telemetry aggregation and calibration LUT storage; suitable only for custom non-SFF modules. | Select when cost sensitivity outweighs SFF-8472 compliance and full DDM capability is not required. |
| DS1875T+T | Includes integrated 12-bit ADC and I²C interface but omits 3-wire master interface for MAX3710; no APD DAC or dual-closed-loop LUT architecture. | Targeted at lower-speed SFP modules (<2.5G) without PON-specific features like RSEL pin or TBLSELPON register. | Choose for legacy SFP designs where GPON/10G-PON support and advanced laser control are unnecessary. |
Compared with DS1884AT+, MAX3658ETE+ requires external components to achieve full SFF-8472 functionality, while DS1875T+T lacks the 3-wire master interface and temperature-compensated APD DAC needed for PON ONU designs-making DS1884AT+ uniquely suited for integrated, standards-compliant optical transceiver control.
Availability
DS1884AT+ is available at Aetrix Electronics and suitable for GPON ONU modules, 10G-PON ONUs, and SFP+ transceivers requiring stable component supply, long-term lifecycle support, and full SFF-8472 compliance.
Supply support for DS1884AT+ 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for communications, computing, and industrial applications.
The DS1884AT+ belongs to Maxim's optical transceiver controller product line, engineered specifically for SFP, SFP+, and PON ONU modules requiring integrated laser control, real-time diagnostics, and SFF-8472 compliance.
FAQ
What is the primary function of the DS1884AT+ in an SFP module?
The DS1884AT+ serves as the central SFF-8472-compliant controller in SFP modules, managing laser bias current, modulation current, APC set-point, and RSSI-based LOS detection. It integrates a 13-bit ADC for real-time monitoring of VCC, temperature, laser bias, laser power, and receive power, and communicates via I²C and a dedicated 3-wire master interface to coordinate with MAX3710/MAX3945 companion ICs. DS1884AT+ ensures full digital diagnostic monitoring (DDM) functionality required for interoperability and field maintenance.
Does the DS1884AT+ support both GPON and 10G-PON ONU applications?
Yes, the DS1884AT+ explicitly supports both GPON and 10G-PON ONU applications through its RSEL pin, TBLSELPON register, and dual-range RSSI monitoring. Its temperature-compensated 9-bit DAC enables stable APD bias control for high-sensitivity receivers, while dual closed-loop LUTs maintain laser power accuracy across wide temperature ranges-critical for meeting ITU-T G.984 and G.987 optical budget requirements. DS1884AT+ is referenced in typical operating circuits for both GPON and 10G-PON ONUs in its official datasheet.
How does the DS1884AT+ handle laser calibration across temperature variations?
The DS1884AT+ uses programmable temperature lookup tables (LUTs) for BIAS, MODULATION, and SET_2XAPC values, indexed by internal die temperature readings. Each LUT entry adjusts control parameters based on measured temperature, enabling automatic compensation for APC tracking error and dual closed-loop calibration drift. This eliminates need for external MCU-based interpolation and ensures consistent laser output power across -40°C to +85°C. DS1884AT+ supports up to four independent LUTs per parameter, configurable via A2h memory registers.
What interfaces does the DS1884AT+ provide for host communication and peripheral control?
The DS1884AT+ provides two distinct interfaces: an I²C-compatible slave interface (SCL/SDA) for host microcontroller access to SFF-8472 memory pages and status registers, and a dedicated 3-wire master interface (CLK/DATA/CS) to directly configure and read back from MAX3710 laser drivers and MAX3945 limiting amplifiers. This dual-interface architecture offloads timing-critical laser control from the host MCU while maintaining full telemetry visibility. DS1884AT+ supports standard- and fast-mode I²C up to 400kHz and synchronous 3-wire operation at up to 10MHz.
Is the DS1884AT+ pin-compatible with earlier versions like DS1882 or DS1875?
No, the DS1884AT+ is not pin-compatible with DS1882 or DS1875. It uses a 24-pin TSSOP package with unique pin assignments-including dedicated RSEL, IN1, and TXCTRLx signal terminals-that differ from the 16-pin TSSOP of DS1882 and the 20-pin TSSOP of DS1875. Electrical characteristics, register maps, and LUT structures are also incompatible. Migration to DS1884AT+ requires PCB layout revision and firmware adaptation. DS1884AT+ is a standalone solution optimized for PON and high-speed SFP+ applications, not a drop-in replacement.
DS1884AT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- I2C
- Voltage - Supply:
- 2.85V ~ 3.6V
- Supplier Device Package:
- 24-TQFN (4x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
DS1884AT+ FAQ
1.How can I place an order for DS1884AT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1884AT+ 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 DS1884AT+ reliable?
The price and inventory of DS1884AT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1884AT+ is usually 5 days.
3.What payment methods are accepted for DS1884AT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1884AT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1884AT+?
DS1884AT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1884AT+ 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 DS1884AT+?
For technical support, including DS1884AT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1884AT+ requirements.
6.How does Aetrix verify that DS1884AT+ is sourced from the original manufacturer or authorized distributors?
All DS1884AT+ 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 DS1884AT+ meets industry standards.
7.What is the process for return or replacement of DS1884AT+?
All DS1884AT+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1884AT+, 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 DS1884AT+ part is unused and in its original packaging.
Return procedure for DS1884AT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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