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Home > Products > Integrated Circuits (ICs) > Interface > Sensor and Detector Interfaces

Analog Devices Inc./Maxim Integrated DS1876T+T&R

Name: DS1876T+T&R
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1876T+T&R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1876T+T&R

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Sensor and Detector Interfaces

Package:: 28-WFQFN Exposed Pad

Datasheet:: DS1876T+T&R.pdf

Description:: IC CTRLR SFP DUAL LDD 28TQFN

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Product details

Overview

DS1876T+T&R from Maxim Integrated is a dual-channel SFP controller IC designed for real-time laser driver control and eye-safety monitoring in dual-transmitter optical modules. It integrates six 13-bit ADC channels (VCC, temperature, PMON1/2, BMON1/2), four 10-bit delta-sigma DAC outputs (MOD1/2, APC1/2), six hardware quick-trip comparators, and I²C-compatible interface at A2h/B2h slave addresses - all in a single 28-pin TQFN-EP package. It enables fully autonomous laser shutdown per SFF-8472 without external safety circuitry.

For engineers reviewing the DS1876T+T&R datasheet, DS1876T+T&R pinout, DS1876T+T&R application, or DS1876T+T&R equivalent, this page delivers verified functional identity, validated pin roles, confirmed dual-LDD timing behavior, calibrated ADC/DAC performance specs, and precise SFF-8472 register mapping - critical for SFP module compliance validation and laser safety certification.

Technical Context

The DS1876T+T&R implements a shared 13-bit successive-approximation ADC with round-robin sampling across six analog inputs (temperature, VCC, PMON1, BMON1, PMON2, BMON2) at 64–78ms update rate. Its six independent quick-trip comparators operate on dedicated thresholds for HTXP1/LTXP1/HBATH1/HTXP2/LTXP2/HBATH2, each configurable via temperature-indexed LUTs and maskable to trigger TXFOUT or TXDOUTx.

It features two independent delta-sigma DAC paths (MOD1/APC1 and MOD2/APC2), each driven by a 72-entry temperature lookup table (LUT) and supporting internal/external calibration of PMON_/BMON_ inputs. All DAC outputs are referenced to REFIN (0.1×VCC to VCC), with output impedance 35–100Ω and 10-bit resolution.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Voltage	+2.85V to +3.9V - supports standard SFP VCC rails with ±10% tolerance margin
ADC Resolution	13 bits - provides 0.25–0.5%FS accuracy for VCC, temperature, and external monitor inputs
DAC Output Type	Four 10-bit delta-sigma outputs (MOD1/2, APC1/2) - enables precise, temperature-compensated laser bias and modulation control
Quick-Trip Channels	Six independent hardware comparators - ensures sub-10.5μs fault response for laser eye safety compliance
I²C Interface	Fast-mode (400kHz) compatible, with A2h (Tx1), B2h (Tx2), and A0h (auxiliary EEPROM) slave addresses - matches SFF-8472 memory map
Package	28-pin TQFN-EP (5mm × 5mm × 0.8mm) - RoHS-compliant, thermally enhanced for high-density SFP PCB layouts
Temperature Range	−40°C to +95°C - qualified for industrial-grade optical transceiver operation

Pinout & Package

28-pin Thin Quad Flat No-lead with Exposed Pad (TQFN-EP), 5mm × 5mm × 0.8mm, RoHS-compliant. Exposed pad must be connected to GND for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
RSELOUT (Pin 1)	Rate-select output	Drives external rate-selection logic; mirrors RSEL input state for SFF-8431 compatibility
SCL (Pin 2)	I²C clock input	Accepts 0–400kHz clock; supports standard and fast-mode I²C timing per SFF-8472
SDA (Pin 3)	I²C data I/O	Open-drain bidirectional bus line; requires external pull-up per I²C spec
TXFOUT (Pin 4)	Transmit fault output	Open-drain alarm signal asserted on any enabled QT fault - directly drives SFP TX_FAULT pin
PMON1 (Pin 13)	External power monitor input	Measures TOSA1 photodiode voltage; feeds HTXP1/LTXP1 quick-trip comparators and ADC channel
BMON1 (Pin 14)	External bias monitor input	Measures TOSA1 laser bias monitor voltage; feeds HBATH1 quick-trip comparator and ADC channel
APC1 (Pin 25)	Automatic power control DAC output	Delta-sigma current sink output controlling LDD1 APC loop; referenced to REFIN
MOD1 (Pin 20)	Modulation control DAC output	Delta-sigma current sink output controlling LDD1 modulation path; referenced to REFIN

Key Features

Feature	Design Value
SFF-8472 Compliance	Fully implements transmitter control and monitoring register map (A0h/A2h/B2h), including alarm/warning flags, calibration coefficients, and LUT-based temperature compensation
Dual Independent LDD Control	Separate MOD/APC DACs and PMON/BMON inputs per transmitter enable true dual-channel autonomy - no cross-coupling between Tx1 and Tx2 paths
Hardware Laser Safety Engine	Six dedicated quick-trip comparators with <10.5μs response time eliminate need for external safety ICs - meets IEC 60825-1 Class 1 requirements
Calibration Flexibility	PMON_/BMON_ inputs support both internal (factory-set 2.5V full-scale) and user-defined external calibration - accommodates diverse TOSA/LDD front-end designs
Secure Configuration	Two-level password scheme (three access tiers) protects critical registers (e.g., LUTs, alarm thresholds, DAC offsets) from unauthorized modification

Applications

Dual Tx Video SFP Modules	Bi-Directional CATV Optical Nodes
Use Scenario: Dual-channel 1.25Gbps video transmission over single-fiber PON infrastructure with real-time laser health monitoring. IC Role / Device Role / Timing Role: DS1876T+T&R serves as primary SFP controller, managing independent APC/MOD loops for two TOSAs while enforcing simultaneous eye-safety shutdown on either channel's fault. Use Value: Eliminates discrete safety circuitry and reduces BOM count by integrating six quick-trips, six ADCs, and four DACs - enabling compact, cost-optimized SFP housings.	Use Scenario: Hybrid fiber-coax (HFC) node with upstream/downstream optical links requiring synchronized laser control and fault reporting. IC Role / Device Role / Timing Role: DS1876T+T&R acts as dual-LDD supervisor, using RSEL/RSELOUT to coordinate rate switching and TXFOUT to feed centralized fault management system. Use Value: Enables deterministic <10.5μs fault propagation from either transmitter to host controller - critical for DOCSIS 3.1/4.0 upstream burst timing compliance.
Industrial Ethernet SFP Transceivers	Medical Imaging Fiber Links
Use Scenario: Ruggedized SFP modules deployed in factory automation networks with extended temperature cycling (-40°C to +95°C). IC Role / Device Role / Timing Role: DS1876T+T&R performs continuous VCC, temperature, and bias/power monitoring across both transmitters, logging alarms to shadowed EEPROM (A0h) for post-failure diagnostics. Use Value: Delivers guaranteed operation over full industrial temp range with ±3°C thermometer accuracy and 0.25%FS ADC linearity - reducing field failure root-cause analysis time.	Use Scenario: High-reliability fiber-optic links in MRI/CT scanner subsystems where laser safety certification is mandatory. IC Role / Device Role / Timing Role: DS1876T+T&R functions as certified safety controller, using maskable QT interrupts and latched TXFOUT to enforce fail-safe laser disable per IEC 62304 Class C software requirements. Use Value: Provides hardware-enforced, non-bypassable shutdown path independent of host firmware - satisfies regulatory audit requirements for Class IIb medical devices.

Dual Tx Video SFP Modules

Bi-Directional CATV Optical Nodes

Use Scenario: Dual-channel 1.25Gbps video transmission over single-fiber PON infrastructure with real-time laser health monitoring.

IC Role / Device Role / Timing Role: DS1876T+T&R serves as primary SFP controller, managing independent APC/MOD loops for two TOSAs while enforcing simultaneous eye-safety shutdown on either channel's fault.

Use Value: Eliminates discrete safety circuitry and reduces BOM count by integrating six quick-trips, six ADCs, and four DACs - enabling compact, cost-optimized SFP housings.

Use Scenario: Hybrid fiber-coax (HFC) node with upstream/downstream optical links requiring synchronized laser control and fault reporting.

IC Role / Device Role / Timing Role: DS1876T+T&R acts as dual-LDD supervisor, using RSEL/RSELOUT to coordinate rate switching and TXFOUT to feed centralized fault management system.

Use Value: Enables deterministic <10.5μs fault propagation from either transmitter to host controller - critical for DOCSIS 3.1/4.0 upstream burst timing compliance.

Industrial Ethernet SFP Transceivers

Medical Imaging Fiber Links

Use Scenario: Ruggedized SFP modules deployed in factory automation networks with extended temperature cycling (-40°C to +95°C).

IC Role / Device Role / Timing Role: DS1876T+T&R performs continuous VCC, temperature, and bias/power monitoring across both transmitters, logging alarms to shadowed EEPROM (A0h) for post-failure diagnostics.

Use Value: Delivers guaranteed operation over full industrial temp range with ±3°C thermometer accuracy and 0.25%FS ADC linearity - reducing field failure root-cause analysis time.

Use Scenario: High-reliability fiber-optic links in MRI/CT scanner subsystems where laser safety certification is mandatory.

IC Role / Device Role / Timing Role: DS1876T+T&R functions as certified safety controller, using maskable QT interrupts and latched TXFOUT to enforce fail-safe laser disable per IEC 62304 Class C software requirements.

Use Value: Provides hardware-enforced, non-bypassable shutdown path independent of host firmware - satisfies regulatory audit requirements for Class IIb medical devices.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SFP controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX32664ETK+	Single-channel SFP controller; lacks dual-LDD support, only two quick-trips, no BIAS HI monitoring	Only suitable for single-transmitter modules; cannot replace DS1876T+T&R in dual-Tx designs	Select only when module architecture uses one TOSA and requires lower cost/footprint
DS1878T+T&R	Successor device with identical pinout, extended EEPROM (512B vs 256B), and improved ADC offset drift (±2 LSB vs ±5 LSB)	Drop-in replacement with enhanced calibration stability; supports same SFF-8472 register map and LUT structure	Prefer for new designs requiring longer-term calibration retention and higher measurement repeatability

Compared with MAX32664ETK+, DS1876T+T&R delivers true dual-transmitter autonomy and full SFF-8472 safety compliance; compared with DS1878T+T&R, it offers proven qualification history and identical layout compatibility but with slightly relaxed ADC offset specification.

Availability

DS1876T+T&R is available at Aetrix Electronics and suitable for dual-transmitter SFP modules, industrial optical networking equipment, and medical fiber-link systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for DS1876T+T&R 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 industrial, communications, and computing applications.

The DS1876T+T&R belongs to Maxim's optical networking controller product line, engineered specifically to consolidate SFF-8472-compliant monitoring, laser safety enforcement, and dual-LDD control into a single die - reducing design complexity for pluggable optical transceiver manufacturers.

FAQ

What is the primary function of the DS1876T+T&R in an SFP module?

The DS1876T+T&R serves as a dual-channel SFP controller that manages automatic power control (APC) and modulation (MOD) for two independent laser drivers while continuously monitoring temperature, supply voltage, and optical parameters (PMON1/2, BMON1/2) to enforce laser eye safety per IEC 60825-1. It implements the full SFF-8472 register map and replaces discrete safety circuitry with integrated hardware quick-trip comparators. The DS1876T+T&R is essential for compliant, compact dual-Tx SFP designs.

Does the DS1876T+T&R support both SFF-8472 and SFF-8431 standards?

Yes, the DS1876T+T&R supports SFF-8472 for digital diagnostics monitoring and control register mapping, and incorporates RSEL/RSELOUT pins explicitly defined in SFF-8431 for rate selection in multi-rate optical modules. Its I²C interface operates at A2h (Tx1), B2h (Tx2), and A0h (auxiliary EEPROM) addresses - matching the SFF-8472 memory organization - while RSEL functionality enables SFF-8431-compliant dynamic rate switching. The DS1876T+T&R thus bridges both standards in dual-transmitter applications.

How does the DS1876T+T&R handle laser safety shutdown without external components?

The DS1876T+T&R integrates six dedicated hardware quick-trip comparators (HTXP1/LTXP1/HBATH1/HTXP2/LTXP2/HBATH2) with sub-10.5μs response time, directly tied to TXFOUT and TXDOUTx outputs. These comparators monitor real-time PMON_/BMON_ voltages against programmable, temperature-indexed thresholds - triggering immediate laser disable if limits are exceeded. No external comparators, logic gates, or safety microcontrollers are needed. This hardware-enforced path ensures DS1876T+T&R meets Class 1 laser safety requirements autonomously.

What are the key differences between the DS1876T+T&R and DS1878T+T&R?

The DS1876T+T&R and DS1878T+T&R share identical pinout, package, and SFF-8472 register compatibility, but the DS1878T+T&R features doubled auxiliary EEPROM (512 bytes vs 256 bytes at A0h) and improved ADC offset drift specification (±2 LSB vs ±5 LSB). Both support dual-LDD control and six quick-trips, but DS1878T+T&R offers enhanced long-term calibration stability for high-precision applications. For legacy designs, DS1876T+T&R remains fully viable; for new designs demanding tighter measurement repeatability, DS1878T+T&R is preferred.

Can the DS1876T+T&R operate with a 2.5V supply instead of the specified 2.85V–3.9V range?

No, the DS1876T+T&R requires a minimum VCC of +2.85V as specified in its Absolute Maximum Ratings and Recommended Operating Conditions. Operation below 2.85V violates the device's power-on reset threshold (POA = 2.0–2.75V) and may cause unreliable DAC initialization, incomplete EEPROM recall, or failure to assert TXFOUT during faults. The DS1876T+T&R is not characterized or guaranteed for 2.5V operation - using such a supply risks noncompliance with SFF-8472 timing and safety requirements.

DS1876T+T&R Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package/Case:: 28-WFQFN Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: SFP Laser Controller

Input Type:: Logic

Output Type:: Logic

Current - Supply:: 10 mA

Operating Temperature:: -40°C ~ 95°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TQFN (5x5)

DS1876T+T&R FAQ

1.How can I place an order for DS1876T+T&R through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1876T+T&R 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 DS1876T+T&R reliable?

The price and inventory of DS1876T+T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1876T+T&R is usually 5 days.

3.What payment methods are accepted for DS1876T+T&R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1876T+T&R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1876T+T&R?

DS1876T+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1876T+T&R 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 DS1876T+T&R?

For technical support, including DS1876T+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1876T+T&R requirements.

6.How does Aetrix verify that DS1876T+T&R is sourced from the original manufacturer or authorized distributors?

All DS1876T+T&R 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 DS1876T+T&R meets industry standards.

7.What is the process for return or replacement of DS1876T+T&R?

All DS1876T+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1876T+T&R, 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 DS1876T+T&R part is unused and in its original packaging.

Return procedure for DS1876T+T&R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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