MP5490

MP5490

ID Plus EML Bias for QSFP Optical Modules

Description

The MP5490 is a complete power management solution, and it is well-suited for the transmitter optical subassembly (TOSA) of quad small form factor pluggable (QSFP) optical modules. The MP5490 integrates four high-accuracy current source (ID) (IDAC) for distributed feedback (DFB) laser diodes (LDs), as well as four negative voltage biases for the EML bias. To simplify the design, the MP5490 also provides four channels with EML current measurements and MPD current measurements.

The device integrates six channels with high-accuracy, low-temperature coefficients, and external analog-to-digital (ADC) inputs. These ADCs can read the ROSA current and temperature information, which saves MCU resources.

All of the output rails can be adjusted via the I²C bus, or they can be preset via the multiple one-time programmable (MOTP) memory.

The MP5490 requires a minimal number of external components, and is available in a space-saving WLCSP-36BT-substrate BGA-36 (3mmx4.25mm) package.

Features & Benefits

Configurable, Accurate ID Current Source for Four Channels:
- Up to 250mA per Channel
- 10-Bit Digital-to-Analog Converter (DAC) for ID Current
Configurable, Accurate EML Biased Voltage for Four Channels:
- -0.1V to -2.5V Range, or -5V Option
- Up to 60mA Load Current per Channel
- 10-Bit DAC for EML Bias Voltage
MPD Measurements for Four Channels:
- 0mA to 5mA Range
Six-Channel GPIO:
- Support for Analog-to-Digital Converter (ADC) Input or GPO Output
- Selectable Open Drain or Push-Pull GPO
High-Accuracy 12-Bit ADC:
- 0V to 2.5V or 0V to 5V External ADC Input
- ID Voltage Measurement for Four Channels
- EML Current Measurement for Four Channels
System:
- I²C Control Interface
- I²C Hardware Reset via HRESET
- Supply and Temperature Fault Alarms
- Available in a WLCSP-36 (3mmx4.25mm) Package