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Analog Devices Inc./Maxim Integrated DS1884T+
- Part No.:
- DS1884T+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
DS1884T+.pdf
- Description:
- IC INTERFACE SPECIALIZED 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,189
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Product details
Overview
DS1884T+ from Maxim Integrated is a 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 receive power monitoring, plus a 9-bit DAC with temperature compensation 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 DS1884T+ datasheet, DS1884T+ pinout, DS1884T+ application, or DS1884T+ equivalent, this controller delivers dual closed-loop laser control, differential RSSI input, scalable dynamic range monitoring, I²C and 3-wire master interfaces, and flexible password-protected EEPROM configuration - critical for SFP+/XFP module design, PON ONU firmware integration, and SFF-8472-compliant diagnostics.
Technical Context
The DS1884T+ implements three configurable laser control modes: dual closed-loop (bias + modulation auto-controlled via LUTs), APC-only loop (bias auto-controlled, modulation LUT-compensated), and open-loop (both controlled by temperature LUTs). Its 13-bit ADC supports internal/external calibration for laser bias, laser power, and differential RSSI, with alarm/warning flags per channel.
A dedicated 9-bit DAC provides temperature-compensated APD bias control, while digital I/O pins include TXD/TXDOUT, RSEL, LOS/LOSOUT, IN1 status/fault, and TXF/TXFOUT. The device communicates via I²C-compatible slave interface and acts as a 3-wire master to MAX3710/MAX3945, enabling full transmitter/receiver functional coverage up to 2.5GHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Laser Control Modes | Dual closed-loop, APC-only, and open-loop - enables precise calibration across temperature for stable optical output in PON ONUs. |
| ADC Resolution | 13-bit - provides high-precision monitoring of VCC, temperature, laser bias, laser power, and RSSI with scalable dynamic range. |
| DAC Resolution | 9-bit with temperature compensation - delivers accurate, drift-corrected APD bias voltage for stable receiver sensitivity. |
| Interface Types | I²C-compatible slave + 3-wire master - allows host MCU communication and direct control of MAX3710/MAX3945 drivers/amplifiers. |
| EEPROM Capacity | 256-byte A0h + 128-byte upper A2h memory - stores calibration data, LUTs, passwords, and SFF-8472-compliant diagnostic tables. |
| RSSI Input Type | Differential with common-mode support to VCC - improves noise immunity and accuracy in high-speed optical receiver monitoring. |
| Security Levels | Three-tier password scheme - protects calibration data, LUTs, and configuration registers against unauthorized access or overwrite. |
Pinout & Package
DS1884T+ is housed in a 28-pin TSSOP package (5.0mm × 9.7mm, 0.65mm pitch) with exposed thermal pad for enhanced thermal performance in compact SFP modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply Voltage | 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 RSSI noise rejection. |
| SCL | I²C Clock Input | Supports standard/fast-mode I²C (up to 400kHz); used for host configuration and readback of monitoring data. |
| SDA | I²C Data Bidirectional | Handles all A0h/A2h memory access, register reads/writes, and alarm status reporting. |
| TXD / TXDOUT | Transmit Disable I/O | Active-low input to disable laser; open-drain output mirrors internal TXD state for system-level fault propagation. |
| LOS / LOSOUT | Loss-of-Signal I/O | Input accepts external LOS signal; output asserts when RSSI falls below programmable threshold. |
| RSEL | Rate Select Input | Configures operating mode (e.g., GPON vs. EPON) and selects appropriate LUTs and scaling factors. |
| IN1 | Status Monitor Input | General-purpose fault/status input (e.g., TEC fault, housing temperature alert) with maskable alarm capability. |
| TXF / TXFOUT | Transmit Fault I/O | Input monitors laser fault condition; output signals internal fault (e.g., APC error, overtemperature) to host. |
Key Features
| Feature | Design Value |
|---|---|
| SFF-8472 Compliance | Fully implements all required control, monitoring, and diagnostic functions - eliminates need for external firmware translation layers. |
| Dual Closed-Loop Calibration | Uses independent temperature lookup tables (LUTs) for bias and modulation - maintains optical power stability across -40°C to +85°C. |
| Differential RSSI Monitoring | Accepts true differential input with VCC-referenced common mode - enables accurate receive power measurement in noisy board environments. |
| APD Bias DAC | 9-bit resolution with integrated temperature compensation - reduces calibration effort and improves long-term APD bias accuracy. |
| Flexible Security Architecture | Three-level password protection (PW1/PW2/PW_EN) - secures calibration data, LUTs, and critical configuration registers. |
Applications
| GPON ONU Module | EPON ONU Module |
|---|---|
Use Scenario: Optical line terminal (OLT)-to-ONU downstream/upstream transmission in fiber-to-the-home networks. IC Role / Device Role / Timing Role: Primary SFF-8472 controller managing laser bias, modulation, RSSI, and fault signaling for 2.5G/1.25G bidirectional optics. Use Value: Enables single-chip compliance with GR-468 reliability and ITU-T G.984.2 specifications through calibrated dual-loop control and differential RSSI. |
Use Scenario: IEEE 802.3ah-compliant Ethernet PON deployment with burst-mode upstream transmission. IC Role / Device Role / Timing Role: Controls laser turn-on timing, bias stabilization, and burst-mode RSSI detection during upstream slot windows. Use Value: Supports fast settling (<500ns) and low-jitter APC tracking essential for EPON upstream burst synchronization. |
| SFP+ Transceiver Module | XFP Transceiver Module |
Use Scenario: 10G Ethernet and Fibre Channel links in data center switches and routers. IC Role / Device Role / Timing Role: Monitors VCC, temperature, TX bias/power, and RSSI while coordinating with MAX3710 driver for 10G NRZ modulation. Use Value: Delivers SFF-8472-compliant real-time diagnostics and alarm/warning thresholds for automated link health management. |
Use Scenario: High-reliability 10G optical interconnects in telecom transport equipment and carrier-grade routers. IC Role / Device Role / Timing Role: Provides full SFF-8472 functionality including EEPROM storage, analog monitoring, and digital I/O for XFP MSA compliance. Use Value: Integrates 256-byte A0h + 128-byte A2h memory and I²C/3-wire dual-interface support - simplifies XFP firmware architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SFP/PON controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3665ETJ+ | Single-function 3.3V laser driver with APC only; no integrated ADC, DAC, or SFF-8472 monitoring logic. | Requires external microcontroller and ADC for full SFF-8472 compliance; suitable for cost-sensitive, non-standard modules. | Select when only laser bias control is needed and host MCU handles monitoring and EEPROM. |
| DS1882T+ | Legacy 12-bit ADC, no APD DAC, limited LUT depth, and no 3-wire master interface for MAX3710. | Supports basic SFF-8472 but lacks dual closed-loop precision and GPON-specific features like TBLSELPON register. | Choose only for backward-compatible replacement in legacy SFP designs where APD biasing is not required. |
Compared with DS1884T+, MAX3665ETJ+ shifts monitoring responsibility to the host, increasing firmware complexity, while DS1882T+ lacks the 13-bit ADC resolution, APD DAC, and GPON-optimized LUT architecture needed for modern PON ONU compliance.
Availability
DS1884T+ is available at Aetrix Electronics and suitable for GPON ONU modules, SFP+ transceivers, and XFP optical modules requiring stable component supply, full SFF-8472 compliance, and temperature-compensated APD bias control.
Supply support for DS1884T+ 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 high-performance analog, mixed-signal, and power management ICs for communications, computing, and industrial systems.
The DS1884T+ belongs to Maxim's optical networking controller product line, engineered specifically for SFP, SFP+, and PON ONU modules requiring integrated laser control, real-time diagnostics, and SFF-8472 compliance without external microcontrollers.
FAQ
What is the primary function of the DS1884T+ in an SFP module?
The DS1884T+ serves as the central SFF-8472-compliant controller in SFP modules, managing laser bias and modulation current, performing APC set-point control with tracking error adjustment, monitoring RSSI for LOS generation, and digitizing VCC, temperature, laser bias, laser power, and receive power via its 13-bit ADC. It enables full digital diagnostics without requiring an external microcontroller.
Does the DS1884T+ support both PIN and APD photodiode configurations?
Yes, the DS1884T+ supports both PIN and APD receiver configurations. Its 9-bit DAC with temperature compensation is specifically designed for precise APD bias control, while its differential RSSI input and scalable ADC range accommodate PIN-based receive power monitoring with high noise immunity and accuracy.
How does the DS1884T+ achieve temperature compensation for laser control?
The DS1884T+ uses multiple programmable temperature lookup tables (LUTs) - including BIAS, MODULATION, and SET_2XAPC LUTs - to adjust laser bias and modulation current based on real-time die temperature readings from its internal 13-bit ADC. This enables dual closed-loop calibration that maintains optical output stability across -40°C to +85°C.
Can the DS1884T+ operate independently without a companion laser driver?
No, the DS1884T+ is designed to operate with companion ICs such as the MAX3710 laser driver/limiting amplifier or MAX3945 limiting amplifier. It acts as a 3-wire master to configure and monitor those devices but does not integrate laser driver circuitry itself - it provides digital control and analog monitoring only.
What security mechanisms does the DS1884T+ provide for calibration data?
The DS1884T+ implements a three-level password protection scheme (PW1, PW2, and PW_EN registers) to secure its 256-byte A0h and 128-byte A2h EEPROM. This prevents unauthorized access to calibration coefficients, LUTs, alarm thresholds, and device configuration - ensuring data integrity in production and field-programmable environments.
DS1884T+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- I2C
- Voltage - Supply:
- 2.85V ~ 3.6V
- Supplier Device Package:
- 24-TQFN (4x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
DS1884T+ FAQ
1.How can I place an order for DS1884T+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1884T+ 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 DS1884T+ reliable?
The price and inventory of DS1884T+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1884T+ is usually 5 days.
3.What payment methods are accepted for DS1884T+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1884T+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1884T+?
DS1884T+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1884T+ 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 DS1884T+?
For technical support, including DS1884T+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1884T+ requirements.
6.How does Aetrix verify that DS1884T+ is sourced from the original manufacturer or authorized distributors?
All DS1884T+ 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 DS1884T+ meets industry standards.
7.What is the process for return or replacement of DS1884T+?
All DS1884T+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1884T+, 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 DS1884T+ part is unused and in its original packaging.
Return procedure for DS1884T+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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