MAXIM New Products - MAX2181A & MAX20021, MAX20022
2013-04-01
MAX24011
2.5Gbps Transimpedance Amplifier
Optimum Combination of Low Power, High Sensitivity, and Built-In Received Signal Strength Indicator
Description
The MAX24011 is a low-power and high-sensitivity 2.5Gbps continuous mode transimpedance amplifier (TIA) optimized for GPON fiber optic applications.
The MAX24011 implements a complete analog front-end, converting the photo-detector current to a differential analog voltage signal.
The MAX24011 has a low-noise front-end, an AGC and typical differential transimpedance of 23kΩ. The MAX24011 also provides a filtered bias current to the photo detector cathode for internally biased PIN applications and a received signal strength indicator (RSSI) output. The RSSI is either derived from the current supplied by the PDC regulator, or represents the average current into the PDA pin for use with externally biased photodetectors, such as an APD.
The MAX24011 is available in die form for mounting on a header to create a ROSA when combined with suitable optics and photo-detector diode.
The MAX24011 implements a complete analog front-end, converting the photo-detector current to a differential analog voltage signal.
The MAX24011 has a low-noise front-end, an AGC and typical differential transimpedance of 23kΩ. The MAX24011 also provides a filtered bias current to the photo detector cathode for internally biased PIN applications and a received signal strength indicator (RSSI) output. The RSSI is either derived from the current supplied by the PDC regulator, or represents the average current into the PDA pin for use with externally biased photodetectors, such as an APD.
The MAX24011 is available in die form for mounting on a header to create a ROSA when combined with suitable optics and photo-detector diode.
Key Features
- -33dBm (typ) Sensitivity With APD
- Up to 2.5Gbps (NRZ) Data Rates
- 190nARMS (typ) Input-Referred Noise
- Automatic Gain Control of Overload
- 31mA (typ) Current Consumption
- Received Signal Strength Indicator Output from PDA or PDC
- -40°C to +95°C Operating Temperature Range
MAX20021, MAX20022
Automotive Quad, Low-Voltage Step-Down DC-DC Converters
Four Integrated Power Rails and High Operating Frequency Minimize Solution Size for Multirail Point-of-Load Regulation
Description
The MAX20021/MAX20022 power-management ICs (PMICs) integrate four low-voltage, high-efficiency, step-down DC-DC converters. Each of the four outputs is factory or resistor programmable between 1.0V to 4.0V and can deliver up to 1.0A of current. The PMICs operate from 3.0V to 5.5V, making them ideal for automotive point-of-load and post-regulation applications.
The PMICs feature fixed-frequency PWM-mode operation with a switching frequency of 2.2MHz or 3.2MHz. High-frequency operation allows for an all-ceramic capacitor design and small-size external components. The low-resistance on-chip switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout a much simpler task with respect to discrete solutions. Internal current sensing and loop compensation reduce board space and system cost.
The PMICs offer a spread-spectrum option to reduce radiated emissions. Two of the four buck converters operate 180° out-of-phase with the internal clock. This feature reduces the necessary input capacitance and improves EMI as well. All four buck converters operate in constant-PWM mode outside the AM band. The PMICs offer a SYNC input to synchronize to an external clock.
The PMICs provide individual enable inputs and power-good/reset outputs, as well as factory-programmable active-low RESET times.
The PMICs offer several important protection features including: input overvoltage protection, input undervoltage monitoring, input undervoltage lockout, cycle-by-cycle current limiting, and overtemperature shutdown. The input undervoltage monitor indicates a brownout condition by driving PG_ low when the input falls below the UVM threshold.
The MAX20021/MAX20022 PMICs are available in a 28-pin TQFN package with an exposed pad and are specified for operation over the -40°C to +125°C automotive temperature range.
Key Features
- Quad Step-Down DC-DC Converters with Integrated FETs
- Operate from 3.0V to 5.5V Supply Voltage
- 1.0V to 4.0V Fixed or Adjustable Output Voltage
- 2.2MHz or 3.2MHz Switching Frequency
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Two Output Current Configurations
- Two 1.0A Outputs and Two 500mA Outputs (MAX20021)
- Four 1.0A Outputs (MAX20022)
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Designed to Improve Automotive EMI Performance
- Forced-PWM Operation
- Two Channels 180º Out-of-Phase
- SYNC Input
- Spread-Spectrum Option
- Soft-Start and Supply Sequencing Reduces Inrush Current
- Individual Enable Inputs and Power-Good Outputs to Simplify Sequencing
- OV/UV Input-Voltage Monitoring
- Overtemperature and Short-Circuit Protection
- 28-Pin (5mm × 5mm × 0.8mm) TQFN-EP Package
- -40°C to +125°C Operating Temperature Range
