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ONET4211LD Datasheet(PDF) 2 Page - Texas Instruments |
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ONET4211LD Datasheet(HTML) 2 Page - Texas Instruments |
2 / 26 page www.ti.com DETAILED DESCRIPTION BLOCK DIAGRAM B0092-01 VCC GND DIN+ DIN- MOD+ MOD- MODSET Current Modulator OUTPOL MODTC BIAS MONB IBMAX MONP PD APCSET SDOWN DISABLE CAPC FLTMODE Input Buffer Stage Modulation Current Generator MODCTRL MODSET IMODEN MODTC IMODMON Reference Voltage and Bias Generation VCC GND 4 3 Bias Current Generator BIAS IBMAX IBEN IBMON IBSET MONB Control IMODEN IMODMON IBEN IBMON DISABLE SDOWN APCCTRL APCMON FLTMODE Automatic Power Control (APC) IBSET APCMON APCCTRL MONP APCSET PD CAPC ONET4211LD SLLS688 – NOVEMBER 2005 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. A simplified block diagram of the ONET4211LD is shown in Figure 1. This compact, low-power, 4.25-Gbps laser driver circuit consists of a high-speed data path and a bias-and-control block. The function of the data path is to buffer the input data and then modulate the laser diode current according to the input data stream. The bias-and-control block generates the laser diode bias current, contains automatic power control (APC) to maintain constant optical output power, generates a modulation current that can be temperature compensated, and controls power on during start-up and shutdown after failure detection. The circuit design is optimized for high-speed and low-voltage operation (3.3 V). The main circuit blocks are described in detail in the following paragraphs. Figure 1. Simplified Block Diagram of the ONET4211LD 2 |
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