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Analog Devices Inc./Maxim Integrated DS1859B-050/TR
- Part No.:
- DS1859B-050/TR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Potentiometers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
DS1859B-050/TR.pdf
- Description:
- DUAL, TEMP-CONTROLLED RESISTOR
- Quantity:
- Payment:
- Shipping:
Inventory:528
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Product details
Overview
DS1859B-050/TR from Maxim Integrated is a dual, temperature-controlled, nonvolatile (NV) variable resistor IC with integrated analog monitoring and direct-to-digital temperature sensing. It features two 50kΩ, 256-position linear resistors, three external analog monitor inputs (MON1–MON3), internal VCC monitoring, and SFF-8472 compatibility - enabling precise bias voltage compensation in optical transceiver laser control loops.
For engineers reviewing the DS1859B-050/TR datasheet, DS1859B-050/TR pinout, DS1859B-050/TR application, or DS1859B-050/TR equivalent, this device serves as a calibrated, EEPROM-stored, temperature-indexed resistance solution for closed-loop thermal compensation in high-reliability optical modules where real-time analog monitoring and I²C-based configuration are required.
Technical Context
The DS1859B-050/TR implements a 2-wire (I²C-compatible) serial interface with programmable device addresses (A0h/A2h) and supports both main and auxiliary memory mapping. Its dual resistors operate in either temperature-indexed mode (2°C resolution over –40°C to +102°C) or manual mode via dedicated EEPROM registers (82h/83h).
Each of the five monitored channels (temperature, VCC, MON1–MON3) delivers 12-bit ADC results (left-justified 16-bit word) updated every 30–45 ms in round-robin fashion, with user-configurable alarm/warning thresholds and interrupt-capable status flags - all managed through dedicated SRAM and EEPROM register maps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resistance Value | Two independent 50kΩ linear variable resistors, position 00h = 0.65–1.35kΩ, position FFh = 40–60kΩ at +25°C |
| Resolution & Linearity | 256 positions; absolute linearity ±2 LSB, relative linearity ±1 LSB - ensures monotonic, predictable resistance steps across full range |
| Temperature Sensing | Direct-to-digital sensor with ±3.0°C accuracy from –40°C to +95°C; outputs two's complement 16-bit value (1/256°C LSB) |
| Analog Monitoring | Five-channel monitoring (VCC, MON1–MON3, temp); VCC full-scale = 6.5536V; MON inputs full-scale = 2.5V (factory default), resolution = 38.147µV |
| Supply & Interface | Operates from 2.85V to 5.5V; supports standard/fast-mode I²C (100/400kHz); SDA/SCL logic levels compatible with 3.3V or 5V systems |
| Nonvolatile Storage | EEPROM stores resistor lookup tables, alarm limits, and configuration; rated for 50,000 write cycles; data retention >10 years at +70°C |
Pinout & Package
DS1859B-050/TR is housed in a 16-ball, 4mm × 4mm, 1.0mm pitch Chip Scale Ball Grid Array (CSBGA) package - optimized for space-constrained optical module PCBs and compliant with JEDEC MO-220 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (Ball B2) | 2-wire serial data I/O | Open-drain bidirectional bus line; requires external pullup; supports standard/fast-mode I²C timing |
| SCL (Ball A2) | 2-wire serial clock input | Input-only clock line; synchronizes all register reads/writes and ADC conversions |
| L0 / H0 (Balls D2 / B3) | Resistor 0 low/high terminals | Passive analog endpoints; support bidirectional voltage application up to VCC; no polarity requirement |
| L1 / H1 (Balls B4 / A4) | Resistor 1 low/high terminals | Independent from Resistor 0; enables separate thermal compensation paths for Tx bias and modulation control |
| MON1–MON3 (Balls D3/D4/C4) | External analog monitor inputs | High-impedance (≥10MΩ) inputs; factory-calibrated; support internal/external scaling and offset correction |
| OUT1 / OUT2 (Balls C3 / B1) | Open-drain buffer outputs | Configurable as Tx Fault (OUT1) and Loss-of-Signal (OUT2); asserted on alarm condition or logic input |
| WPEN (Ball C1) | Write protect enable | Pulled high internally (40–100kΩ); grounding disables write protection for EEPROM/resistor programming |
Key Features
| Feature | Design Value |
|---|---|
| SFF-8472 compliance | Fully satisfies diagnostic monitoring requirements for SFP/SFP+ optical transceivers including Tx bias, Tx power, Rx power, and temperature reporting |
| Temperature-indexed resistors | Each resistor maps to 65 unique 2°C temperature bins (–40°C to +102°C); enables automatic thermal drift compensation without host MCU intervention |
| Five-channel analog monitoring | Simultaneous digitization of VCC, temperature, and three external analog signals with 12-bit effective resolution and user-defined alarm thresholds |
| Dual-device addressing | Supports A0h (auxiliary) and A2h (main) I²C addresses; allows co-location with other SFF devices on same bus while isolating memory spaces |
| High-Z resistor control | Single-bit SRAM register (HIZCO) places both resistors into >1MΩ high-impedance state - useful for safe power-up/power-down sequencing |
Applications
| Optical Transceivers | RF Power Amplifiers |
|---|---|
Use Scenario: Real-time calibration of laser diode bias current and modulation voltage in SFP+ modules under varying ambient and junction temperatures. IC Role / Device Role / Timing Role: Dual resistor provides temperature-compensated reference for bias DACs; monitors VCC and MON1–MON3 for supply stability and photodiode feedback. Use Value: Maintains optical output power within ±0.5dB across –40°C to +85°C operating range by updating resistor values every 2°C increment. | Use Scenario: Stabilizing quiescent current in GaN RF power amplifier stages subject to thermal runaway during high-power transmission bursts. IC Role / Device Role / Timing Role: Resistor 0 sets gate bias voltage; Resistor 1 adjusts source degeneration; MON2 monitors drain supply rail; temperature sensor tracks heatsink rise. Use Value: Reduces PA efficiency drift from 18% to <3% over 60°C temperature swing by dynamically adjusting bias points using embedded lookup tables. |
| Instrumentation & Industrial Controls | Diagnostic Monitoring Systems |
Use Scenario: Precision calibration of sensor front-end gain and offset in portable gas analyzers with battery-powered operation and wide thermal excursions. IC Role / Device Role / Timing Role: MON1–MON3 acquire analog outputs from electrochemical sensors; DS1859B-050/TR resistors trim reference voltages and feedback networks based on measured temperature. Use Value: Achieves <0.1% full-scale error stability over –25°C to +70°C without recalibration, leveraging factory-trimmed analog monitoring and EEPROM-stored compensation curves. | Use Scenario: Embedded health monitoring in medical laser systems requiring redundant fault detection for cooling, power, and optical output integrity. IC Role / Device Role / Timing Role: OUT1 asserts Tx Fault on VCC undervoltage or temperature over-limit; OUT2 signals Loss-of-Signal when MON3 (photodiode current) drops below threshold. Use Value: Enables fail-safe shutdown within 45ms of fault detection - meeting IEC 60601-1 safety response time requirements for Class II medical equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-resistor analog monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31723 | Single 10kΩ NV resistor + digital temperature sensor only; no analog monitor inputs or dual-resistor capability | Applicable only for basic thermal compensation without voltage/current monitoring | Select when system already includes external ADCs and only needs temperature-driven resistance adjustment |
| AD5272BRUZ50 | Single 50kΩ I²C DAC with 1024-step resolution; no temperature sensor, no analog monitoring, no EEPROM nonvolatility | Requires external temperature sensing and host MCU to implement thermal compensation algorithm | Select when higher resolution is critical and thermal compensation logic resides in host processor |
Compared with MAX31723 and AD5272BRUZ50, DS1859B-050/TR uniquely integrates dual temperature-indexed resistors, five-channel analog monitoring, and SFF-8472-compliant firmware in one CSBGA package - eliminating external ADCs, temperature sensors, and compensation firmware while reducing BOM count by ≥4 components in optical diagnostics.
Availability
DS1859B-050/TR is available at Aetrix Electronics and suitable for optical transceivers, RF power amplifiers, and diagnostic monitoring systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for DS1859B-050/TR 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 high-reliability ICs for communications, computing, and industrial applications - with emphasis on integration, calibration, and system-level functionality.
The DS1859 product line targets optical module manufacturers needing SFF-8472-compliant, self-contained analog monitoring and temperature-compensated bias control - reducing design complexity and qualification effort in pluggable transceiver development.
FAQ
What is the resistance tolerance and temperature coefficient of DS1859B-050/TR at 25°C?
At +25°C, DS1859B-050/TR exhibits position 00h resistance of 0.65–1.35kΩ and position FFh resistance of 40–60kΩ. Its temperature coefficient is specified at 50ppm/°C across the full resistance range and operating temperature (–40°C to +95°C), verified per typical operating characteristics (DS1859 toc16/toc17).
How does DS1859B-050/TR achieve SFF-8472 compliance?
DS1859B-050/TR achieves SFF-8472 compliance through its five-channel monitoring (temperature, VCC, MON1–MON3), programmable alarm/warning thresholds, 2-wire interface with A0h/A2h addressing, and memory organization matching SFF-8472 Table 4/5 layouts - enabling direct integration into SFP/SFP+ modules without additional translation logic.
Can DS1859B-050/TR operate in manual resistor mode without temperature indexing?
Yes. DS1859B-050/TR supports manual mode by clearing the TEN bit in EEPROM register space; resistor values are then set directly via writes to addresses 82h (Resistor 0) and 83h (Resistor 1), decoupling resistance from temperature and allowing static or host-controlled adjustment.
What is the update rate for analog monitoring channels in DS1859B-050/TR?
The DS1859B-050/TR updates each monitored channel (temperature, VCC, MON1–MON3) every 30–45ms in round-robin sequence, as defined by tframe parameter in DC electrical characteristics. This fixed frame rate ensures deterministic latency for alarm flag assertion and host polling intervals.
Does DS1859B-050/TR support write protection, and how is it enabled?
Yes. DS1859B-050/TR supports hardware write protection via the WPEN pin (Ball C1): when left floating or pulled high, write protection is active; grounding WPEN disables protection. Additionally, MPEN/APEN bits in EEPROM configure software-level protection for main/auxiliary memory blocks.
DS1859B-050/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Rheostat
- Number of Circuits:
- 2
- Number of Taps:
- 256
- Resistance (Ohms):
- 50k
- Interface:
- Serial
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.85V ~ 5.5V
- Features:
- Selectable Address, Temperature Sensor
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 50ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
- Operating Temperature:
- -40°C ~ 95°C
- Resistance - Wiper (Ohms) (Typ):
- -
DS1859B-050/TR FAQ
1.How can I place an order for DS1859B-050/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1859B-050/TR 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 DS1859B-050/TR reliable?
The price and inventory of DS1859B-050/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1859B-050/TR is usually 5 days.
3.What payment methods are accepted for DS1859B-050/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1859B-050/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1859B-050/TR?
DS1859B-050/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1859B-050/TR 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 DS1859B-050/TR?
For technical support, including DS1859B-050/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1859B-050/TR requirements.
6.How does Aetrix verify that DS1859B-050/TR is sourced from the original manufacturer or authorized distributors?
All DS1859B-050/TR 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 DS1859B-050/TR meets industry standards.
7.What is the process for return or replacement of DS1859B-050/TR?
All DS1859B-050/TR units undergo pre-shipment inspection (PSI). If there is an issue with DS1859B-050/TR, 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 DS1859B-050/TR part is unused and in its original packaging.
Return procedure for DS1859B-050/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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