MAX3955 11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver
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11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver General Description The MAX3955 is an 11.3Gbps, highly-integrated, lowpower transceiver with dual CDRs, and digital diagnostics monitoring (DDM) designed for next-generation SONET transmission systems. The receiver incorporates a limiting amplifier with loss-of-signal (LOS) circuit. The limiting amplifier features an independent 9.95Gbps to 11.32Gbps CDR. The transmitter incorporates Maxim’s proprietary DC-coupled laser driver interface, an independent 9.95Gbps to 11.32Gbps CDR, and closed-loop control of average laser power. The MAX3955 supports differential AC-coupled signaling with integrated 50Ω terminations at Rx input, Rx output, and Tx input. The Tx output is a DC-coupled 25Ω laser diode interface with dedicated pins for the laser anode (TOUTA) and the laser cathode (TOUTC). An integrated 12-bit analog-to-digital converter (ADC) is utilized to provide digital monitors of internal/external temperature, VCC, and received signal strength indication (RSSI). The MAX3955’s analog monitors and the use of a 2-wire or 3-wire slave interface enables configuration through either a digital-only microcontroller (µC) or through the DS1978 SFP+ controller (future product). The MAX3955 operates from single +3.3V supply and over a -40°C to +95°C temperature range and is available in a standard 5mm x 5mm, 32-pin TQFN-EP package. Ordering Information appears at end of data sheet. Performance ●● Dual CDRs Exceeding SONET Jitter Requirements with PLL Bandwidth Setting of 7MHz ●● 540mW Typical IC Power Dissipation (ILD_MOD = 45mA, IBIAS = 45mA, Both CDRs Enabled) Flexibility ●● Independent, Reference-less Tx and Rx CDRs ●● Pattern Generator for Receive and Transmit Paths ●● Signal Loop-Back Paths ●● Programmable Tx Input Equalization and Rx Output Deemphasis ●● Pin-Compatible with MAX3956 11.3Gbps Transceiver Safety and Monitoring ●● Integrated Eye Safety Features with Maskable Fault and Interrupt Signal Generation ●● Analog Monitors with Integrated 12-Bit ADC, Fully Supporting SFF-8472 DDM with Digital-Only µC ●● High-Accuracy Temperature, VCC, and RSSI Monitors ●● Auxiliary ADC Input at BADC for General Use ●● OC-192 XFP and SFP+ Optical Transceivers For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX3955.related. Simplified Block Diagram 9.95 TO 11.32Gbps LIMITING AMPLIFIER WITH CDR 50Ω 9.95 TO 11.32Gbps, DC-COUPLED LASER DRIVER WITH CDR VCCTO TOUTA TOUTC DC-COUPLED LASER DRIVER

11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a...

11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver Electrical Characteristics (continued) (VCCX = VCCRO = VCCT = 2.85V to 3.47V, VCCTO = 2.97V to 3.47V, VGND = 0V, TA = -40°C to +95°C. Typical values are at VCCX = VCCRO = VCCT = VCCTO = 3.3V, 14Ω single-ended load for TOUTC/TOUTA and TA = +25°C, unless otherwise noted. See Figure 1 for electrical setup.) (Note 2) PARAMETER Random Jitter ROUT Rise/Fall Time VRIN = 60mVP-P at 10.3Gbps, 11111 00000 pattern, SET_CML[4:0] = 10d, CDR disabled (Note 4) RX CDR CHARACTERISTICS SPECIFICATION (Notes 4 and 17) CDR...

11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver Electrical Characteristics (continued) (VCCX = VCCRO = VCCT = 2.85V to 3.47V, VCCTO = 2.97V to 3.47V, VGND = 0V, TA = -40°C to +95°C. Typical values are at VCCX = VCCRO = VCCT = VCCTO = 3.3V, 14Ω single-ended load for TOUTC/TOUTA and TA = +25°C, unless otherwise noted. See Figure 1 for electrical setup.) (Note 2) PARAMETER TX INPUT SPECIFICATION Differential Input Resistance LASER DC CURRENT GENERATOR (Note 10) Maximum DC-ON Current Current into VOUT pin Minimum DC-ON Current Current into VOUT pin Maximum...

11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver Electrical Characteristics (continued) (VCCX = VCCRO = VCCT = 2.85V to 3.47V, VCCTO = 2.97V to 3.47V, VGND = 0V, TA = -40°C to +95°C. Typical values are at VCCX = VCCRO = VCCT = VCCTO = 3.3V, 14Ω single-ended load for TOUTC/TOUTA and TA = +25°C, unless otherwise noted. See Figure 1 for electrical setup.) (Note 2) PARAMETER LASER MODULATOR OUTPUT (TX_EQ[1:0] = 00, 10mA < ILD_MOD < 85mA, VTIN = 150 to 1000mVP-P differential amplitude) (Note 4) Modulation Current Rise/Fall Time Deterministic Jitter (Note 5)...

11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver Electrical Characteristics (continued) (VCCX = VCCRO = VCCT = 2.85V to 3.47V, VCCTO = 2.97V to 3.47V, VGND = 0V, TA = -40°C to +95°C. Typical values are at VCCX = VCCRO = VCCT = VCCTO = 3.3V, 14Ω single-ended load for TOUTC/TOUTA and TA = +25°C, unless otherwise noted. See Figure 1 for electrical setup.) (Note 2) PARAMETER RSSI MONITOR ADC Resolution LSb Size RSSI Input Current Range RSSI Offset Current RSSI Offset Current Stability RSSI Gain Error TX POWER MONITOR Average current into MDIN pin, 50µA <...

11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver Electrical Characteristics (continued) (VCCX = VCCRO = VCCT = 2.85V to 3.47V, VCCTO = 2.97V to 3.47V, VGND = 0V, TA = -40°C to +95°C. Typical values are at VCCX = VCCRO = VCCT = VCCTO = 3.3V, 14Ω single-ended load for TOUTC/TOUTA and TA = +25°C, unless otherwise noted. See Figure 1 for electrical setup.) (Note 2) PARAMETER Input Leakage Current Low (SCL, CSEL) Input Leakage Current Low (SDA) Input connected to GND, internal 75kΩ pullup Input Leakage Current Low (DISABLE) Input connected to GND, internal...