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DS1874
SFP+ Controller with Digital LDD Interface
Combination of DS1874 and MAX3798/MAX3799 Provides APC Loop, Current Control, and Complete SFF-8472 Functionality
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Status
Active: In Production.
Description
The DS1874 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The combination of the DS1874 with the MAX3798/MAX3799 laser driver/limiting amplifier provides APC loop, modulation current control, and eye safety functionality. The DS1874 continuously monitors for high output current, high bias current, and low and high transmit power to ensure that laser shutdown for eye safety requirements are met without adding external components. Six ADC channels monitor VCC, temperature, and four external monitor inputs (MON1–MON4) that can be used to meet all monitoring requirements. MON3 is differential with support for common mode to VCC. Two digital-to-analog (DAC) outputs with temperature-indexed lookup tables (LUTs) are available for additional monitoring and control functionality.
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Data Sheet
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An evaluation kit is available: DS1874K
Key Features
- Meets All SFF-8472 Control and Monitoring Requirements
- Laser Bias Controlled by APC Loop and Temperature LUT to Compensate for Tracking Error
- Laser Modulation Controlled by Temperature LUT
- Six Analog Monitor Channels: Temperature, VCC, MON1–MON4
- MON1–MON4 Support Internal and External Calibration
- Scalable Dynamic Range
- Internal Direct-to-Digital Temperature Sensor
- Alarm and Warning Flags for All Monitored Channels
- Two 9-Bit Delta-Sigma Outputs with 36 Entry Temperature LUTs
- Digital I/O Pins: Five Inputs, Five Outputs
- Comprehensive Fault-Measurement System with Maskable Laser Shutdown Capability
- Flexible, Two-Level Password Scheme Provides Three Levels of Security
- 256 Additional Bytes Located at A0h Slave Address
- I²C-Compatible Interface
- 3-Wire Master to Communicate with the MAX3798/MAX3799 Laser Driver/Limiting Amplifier
- +2.85V to +3.9V Operating Voltage Range
- -40°C to +95°C Operating Temperature Range
- 28-Pin TQFN (5mm x 5mm) Package
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Applications/Uses
- SFF, SFP, and SFP+ Transceiver Modules
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Key Specifications:
| Fiber Monitoring and Control |
| Part Number |
ADCs |
Resolution
(bits) |
DACs/ Resistors |
FS Out
(kΩ) |
Steps |
Temp. Sensor |
Memory |
VSUPPLY
(V) |
Control Interface |
EV Kit |
Budgetary Price |
| See Notes |
| DS1874 |
5-Input Muxable |
13 |
2 DACs |
None |
None |
Internal |
EEPROM |
2.85 to 3.9 |
I2C |
No |
$1.48 @1k |
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See All Fiber Monitoring and Control (19)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Application Notes
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS1874T+
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1874T+T&R
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Similar Products by Function
| DS1856 |
Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection |
| DS1873 |
SFP+ Controller with Analog LDD Interface |
| MAX3798 |
1.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver |
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Similar Products by Application
Evaluation Kits
| DS1874K |
Evaluation Kit for the DS1874 |
Products with Similar Part Numbers
| DS1874K |
Evaluation Kit for the DS1874 |
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-4691
Rev 0;
2009-07-07
This page last modified: 2010-01-19
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