Analog Devices Inc./Maxim Integrated DS1852B-000

Overview

DS1852B-000 from Maxim Integrated is a fiber-optic transceiver diagnostic monitor IC implementing SFF-8472 proposal at device address A2h. It integrates a 4-input muxing ADC, direct-to-digital temperature sensor, three temperature-compensated fast comparators, and 127-byte EEPROM for security level 1. It operates from 3V or 5V supply and supports -40°C to +100°C ambient range in optical module monitoring applications.

For engineers reviewing the DS1852B-000 datasheet, DS1852B-000 pinout, DS1852B-000 application, or DS1852B-000 equivalent, key selection considerations include 2-wire interface compliance with SFF-8472, programmable alarm/warning thresholds per analog channel, temperature-dependent trip-point scaling for Bin/Pin/Rin inputs, and BGA-25 package compatibility with optical transceiver module layouts.

Technical Context

The DS1852B-000 implements a dedicated 2-wire (I²C-compatible) slave interface with configurable device address (A0h or A2h via ASEL), supporting both standard (100kHz) and fast-mode (400kHz) clock rates. Its internal architecture includes a rotating 5-channel ADC (VCC, temperature, Bin, Pin, Rin) updating every 13ms nominal, with 12-bit effective resolution and factory-calibrated LSB scaling.

Three fast comparators provide sub-10µs response on Bin/Pin/Rin with 8-bit temperature-dependent trip-point programming (D8h–E7h), while 10 high-resolution alarm/warning comparators use 16-bit setpoints stored in Table 03h. Security is enforced via dual-level password protection (32-bit Level 1, factory-programmed Level 2), with memory access segmented across Tables 00h–03h and privilege gating per byte.

Key Specifications

Pinout & Package

DS1852B-000 uses a 25-ball BGA package (5mm × 5mm, 0.8mm pitch) with 12 functional terminals and 8 no-connect balls. The layout follows a defined top-view grid (A–E rows, 1–5 columns), with power, I²C, analog, and digital I/O distributed to minimize noise coupling in high-speed optical modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar optical transceiver monitoring applications.

Compared with MAX32660GWE+T and LM75BIMM/NOPB, the DS1852B-000 delivers turnkey SFF-8472 compliance with zero firmware investment, integrated analog front-end scaling, and hardware-enforced security - making it optimal for volume optical module production where time-to-market and specification adherence are critical.

Availability

DS1852B-000 is available at Aetrix Electronics and suitable for optical transceiver module manufacturing, SFP/GBIC production, and telecom line card assembly requiring stable component supply and long-term lifecycle support.

Supply support for DS1852B-000 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) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1852B-000 belongs to Maxim's optical communications monitor product line, engineered specifically to meet SFF-8472 requirements for real-time diagnostics in pluggable fiber-optic transceivers.

FAQ

What is the primary function of the DS1852B-000 in an optical transceiver module?

The DS1852B-000 serves as a dedicated diagnostic monitor implementing SFF-8472 specifications. It continuously measures temperature, supply voltage (VCC), laser bias current (Bin), transmitted optical power (Pin), and received optical power (Rin) via its integrated ADC and temperature sensor. It reports these values, along with digital input states (TX_FAULT, LOS, etc.) and programmable alarm/warning flags, over a 2-wire interface to the host system - enabling real-time health monitoring and fault detection in GBIC/SFP modules.

Does the DS1852B-000 require external components to achieve full SFF-8472 compliance?

Yes, the DS1852B-000 implements the SFF-8472 proposal at device address A2h but requires an external EEPROM at address A0h to store IEEE identity data and complete the full SFF-8472 memory map. The DS1852B-000 itself contains 127 bytes of EEPROM for security level 1 and supports address selection via the ASEL pin, which must be tied high for A2h operation in standard configurations.

How does the DS1852B-000 handle temperature compensation for its analog comparators?

The DS1852B-000 provides temperature-dependent trip-point programming for its three fast comparators (Bin, Pin, Rin). Bin supports eight unique temperature-dependent thresholds, while Pin and Rin each support four. These are configured via 8-bit values stored in Table 03h (addresses D8h–E7h), allowing trip points to scale with ambient temperature - preventing false alarms due to thermal drift without host CPU intervention.

What are the security levels supported by the DS1852B-000 and how are they enforced?

The DS1852B-000 enforces three security levels via 32-bit password protection: User (default, read-only access to identity and monitoring data), Manufacturer Level 1 (read/write access to customer data table and selected settings), and Manufacturer Level 2 (full access to all memory and features). Passwords are entered into Table 00h (7Bh–7Eh); Level 1 password is user-modifiable, while Level 2 is factory-programmed and write-protected.

What is the ADC update rate and effective resolution of the DS1852B-000?

The DS1852B-000 performs rotating conversions across five channels (VCC, temperature, Bin, Pin, Rin) every 13ms nominal (20ms max). Although 16-bit values are read, only the upper 12 bits are valid - delivering 12-bit effective resolution. Temperature is reported as signed 15-bit 2's complement (MSB at 60h, LSB at 61h), while analog voltages use unsigned 16-bit format with defined LSB scaling (e.g., 38.147 µV for Bin/Pin/Rin).