The DS1878T+T is a SFP+ controller with digital LDD interface in 28 pin TQFN package. It controls and monitors all functions for SFF, SFP and SFP+ modules including all SFF-8472 functionality. The combination of DS1878 with Maxim laser driver/limiting amplifier solutions supports VCSEL, DFB and EML based solutions. The device provides APC loop, modulation current control and eye safety functionality. It continuously monitors for high output current, high bias current, 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. A MON3 pin is differential with support for common mode to VCC. Two digital to analogue (DAC) outputs with temperature indexed lookup tables (LUTs) are available for additional control functionality.
- Supply voltage range of 2.85V to 5.5V and supply current of 2.5mA
- Operating temperature range from -40°C to 95°C
- Meets all SFF-8472 control and monitoring requirements
- 9bit output resolution, ±3°C thermometer error and 5MHz main oscillator frequency
- Laser modulation controlled by temperature LUT
- 256 additional bytes located at A0h slave address
- Two 9bit delta sigma outputs with 36 entry temperature LUTs
- Digital I/O pins (five inputs, four outputs)
- Comprehensive fault measurement system with maskable laser shutdown capability
- I2C compatible interface, 3-wire master to communicate with Maxim laser driver/limiting amplifier
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