ONET1151MRGTT

ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 11.35-Gbps Differential Modulator Driver with Output Waveform Shaping Check for Samples: ONET1151M FEATURES 1 • 2 • • • • • • • 1.5-VPP Single-Ended Output Voltage into a 50Ω Load Programmable Input Equalizer Output Pre-emphasis Adjustable Rise and Fall Times Cross-Point Control Output Polarity Select 2-Wire Digital Interface Single 3.3-V Supply • • –40°C to 100°C Operation Surface Mount 3-mm x 3-mm 16-Pin RoHS Compliant QFN Package APPLICATIONS • • • SONET OC-192/SDH STM-64 Optical Transmitters 10-Gigabit Ethernet Optical Transmitters SFP+ and XFP Transceiver Modules DESCRIPTION The ONET1151M is a high-speed, 3.3-V modulator driver designed to modulate a differentially driven Mach Zehnder Modulator at data rates from 1 Gbps up to 11.35 Gbps. The output amplitude can be controlled with an externally applied voltage. A 2-wire serial interface allows digital control of the equalizer, output pre-emphasis, eye crossing point, rise and fall times, and the amplitude, eliminating the need for external components. Output waveform control, in the form of pre-emphasis, cross-point adjustment and rise and fall time adjustment are available to improve the optical eye mask margin. An optional input equalizer with 10 dB of boost at 5 GHz can be used for equalization of up to 300-mm (12 in.) of microstrip or stripline transmission line on FR4 printed circuit boards. The modulator driver is characterized for operation from –40°C to 100°C case temperature and is available in a small footprint 3-mm × 3-mm 16-pin RoHS compliant QFN package. 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. I2C is a trademark of Philips Semiconductor Inc. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2012, Texas Instruments Incorporated ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. BLOCK DIAGRAM Figure 1 shows a simplified block diagram of the ONET1151M. The modulator driver consists of an equalizer, a limiter, an output driver, power-on reset circuitry, a 2-wire serial interface including a control logic block, a modulation current generator, and an analog reference block. Crosspoint Adjust VCC DC Offset Cancellation To Digital Circuitry VCCD Active Back Termination OUT+ 100Ω Equalizer Amplifier OUT- Limiter DIN+ DINVCC 10 kΩ 10 kΩ Mod. Current Generator Adjustable Boost 10 kΩ AMP SDA SDA SCK SCK DIS DIS 8 Bit Register 8 Bit Register 8 Bit Register 8 Bit Register 8 Bit Register 8 Bit Register 8 Bit Register 8 Bit Register 8 Bit Register 10 Bit Register Settings AMP Pre-emphasis Equalizer Crosspoint Crosspoint Settings Limiter Current ABT Settings ADC Settings ADC 2-Wire Interface and Control Logic Crosspoint Adjust Analog to Digital Conversion Power-On Reset Band-Gap, Analog References, Power Supply Monitor and Temperature Sensor RZTC PSM TS BGV RZTC BGV Figure 1. Simplified Block Diagram of the ONET1151M 2 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 PACKAGE VCC OUT+ OUT- VCC The ONET1151M is packaged in a small footprint 3-mm × 3-mm 16-pin RoHS compliant QFN package with a lead pitch of 0.5 mm. 16 15 14 13 12 GND DIS 1 VCCD 2 11 AMP ONET 1151M 10 BGV SCK 3 16 Pin QFN 9 5 6 7 8 GND DIN+ DIN- GND SDA 4 RZTC Figure 2. 16-Pin QFN Package, 3-mm x 3-mm (Top View) Table 1. PIN DESCRIPTIONS PIN TYPE DESCRIPTION NAME NO. DIS 1 Digital–in Disables bias, modulation, and peaking currents when set to high state. Includes a 10-kΩ or 40-kΩ pullup resistor to VCC. VCCD 2 Supply 3.3 V ± 10% supply voltage for the digital logic. Connect to VCC. SCK 3 Digital–in 2-wire interface serial clock. Includes a 10-kΩ or 40-kΩ pullup resistor to VCC. SDA 4 Digital–in/out 2-wire interface serial data input. Includes a 10-kΩ or 40-kΩ pullup resistor to VCC. GND 5, 8, 12 Supply Circuit ground DIN+ 6 Analog–in Non-inverted data input. On-chip differentially 100-Ω terminated to DIN–. Must be AC coupled. DIN– 7 Analog–in Inverted data input. On-chip differentially 100-Ω terminated to DIN+. Must be AC coupled. RZTC 9 Analog Connect external zero TC 28.7-kΩ resistor to ground (GND). Used to generate a defined zero TC reference current for internal DACs. BGV 10 Analog–out Buffered bandgap voltage with 1.16-V output. This is a replica of the bandgap voltage at RZTC. AMP 11 Analog–in Output amplitude control. Output amplitude can be adjusted by applying a voltage of 0 to 2.5 V to this pin. VCC 13, 16 Supply 3.3 V ± 10% supply voltage. Connect to VCCD. OUT- 14 CML–out (current) Inverted data output OUT+ 15 CML–out (current) Non-inverted data output EP EP Thermal Exposed die pad (EP) must be grounded. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 3 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VALUE PARAMETER Supply voltage (2) VCC VDIS, VRZTC, VSCK, VSDA, VBGV, VAMP, VDIN+, VDIN-, Voltage at DIS, RZTC, SCK, SDA, BGV, AMP, DIN+, DIN-, OUT+, OUTVOUT+, VOUT- (2) UNIT MIN MAX –0.3 4 V –0.3 4 V IDIN-, IDIN+ Max. current at input pins 25 mA IMOD+, IMOD– Max. current at output pins 35 mA ESD rating at all pins except OUT+ and OUT- ESD TJ, max 2 kV (HBM) ESD rating at OUT+ and OUT- 1.5 kV (HBM) Maximum junction temperature 125 °C TSTG Storage temperature range –65 150 °C TC Case temperature -40 110 °C (1) (2) 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 under Recommended Operating Conditions is not implied. Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability. All voltage values are with respect to network ground terminal. RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) PARAMETER CONDITION VCC Supply voltage VIH Digital input high voltage DIS, SCK, SDA VIL Digital input low voltage DIS, SCK, SDA (1) 1.16-V bandgap bias across resistor, E96, 1% accuracy VALUE MIN TYP MAX 2.97 3.3 3.63 2 V V V 29 kΩ Zero TC resistor value VIN Differential input voltage swing 150 1200 VAMP Amplitude control input voltage range 0 2.5 V tR-IN Input rise time 20%–80% 55 ps tF-IN Input fall time 20%–80% TC Temperature at thermal pad 4 28.7 0.8 RRZTC (1) 28.4 UNIT 30 30 –40 mVp-p 55 ps 100 °C Changing the value alters the DAC ranges and the current consumption. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 DC ELECTRICAL CHARACTERISTICS over recommended operating conditions with 50-Ω output load, VOUT+ = 1.5 VPP and RRZTC = 28.7 kΩ, unless otherwise noted. Typical operating condition is at 3.3 V and TA = 25°C PARAMETER VCC VALUE CONDITION Supply voltage TYP MAX 2.97 3.3 3.63 VCC = 3.47 V, PKENA = 1 100 VCC = 3.63 V, PKENA = 1 105 VCC = 3.47 V, PKENA = 1 347 VCC = 3.63 V, PKENA = 1 381 IVCC Supply current P Power Dissipation RIN Data input resistance Differential between DIN+ / DIN- IIH High level digital input current SCK, SDA, DIS set to VCC IIL Low level digital input current SCK, SDA, DIS set to GND VCC-RST VCC reset threshold voltage VCC voltage level which triggers power-on reset VCC-RSTHYS VCC reset threshold voltage hysteresis (1) MIN (1) V mA mW 120 Ω –10 10 µA –500 500 µA 2.8 V 80 (1) UNIT 100 2.3 2.5 100 mV Assured by simulation over process, supply and temperature variation AC ELECTRICAL CHARACTERISTICS over recommended operating conditions with 50-Ω output load, VOUT+ = 1.5 VPP and RRZTC = 28.7 kΩ unless otherwise noted. Typical operating condition is at VCC =3.3 V and TA = 25°C. PARAMETER VALUE CONDITION MIN TYP Data rate 11.35 0.01 GHz < f < 5 GHz –15 5 GHz < f < 11.1 GHz –8 SDD11 Differential input return gain SCD11 Differential to common mode conversion gain 0.01 GHz < f < 11.1 GHz VO-MIN Minimum output amplitude 50-Ω load, single-ended VO-MAX Maximum output amplitude 50-Ω load, single-ended, OASH0 = OASH1 = 0 Output amplitude stability 50-Ω load, single-ended tR-OUT Output rise time 20% – 80%, tR-IN < 40 ps, 50-Ω load, single-ended, cross point = 50%. (1) tF-OUT Output fall time 20% – 80%, tF-IN < 40 ps, 50-Ω load, single-ended, cross point = 50%. (1) ISI RJ (1) (2) Intersymbol interference UNIT MAX Gbps dB –15 dB 300 mVPP 1.4 EQENA = 0, K28.5 pattern at 11.35 Gbps, 150-mVPP, 600-mVPP, 1200-mVPP differential input voltage, single-ended output. 750 mVPP ≤ VOUT ≤ 1.5 VPP VPP 200 mV 26 36 ps 26 36 ps 5 10 psp-p (2) EQENA = 1, K28.5 pattern at 11.35 Gbps with 12-inch transmission line at the input, 150-mVPP, 600-mVPP, 1200-mVPP input to transmission line, single-ended output. 750 mVPP ≤ VOUT ≤ 1.5 VPP. 6 Random output jitter EQENA = 0 0.3 High cross point control range 50-Ω load, single-ended 75 % Low cross point control range 50-Ω load, single-ended 25 % 0.6 psRMS 1010 pattern with PKENA = 1 and PEADJ (Register 2) set to 0x0F. Jitter at the eye crossing point. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 5 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com AC ELECTRICAL CHARACTERISTICS (continued) over recommended operating conditions with 50-Ω output load, VOUT+ = 1.5 VPP and RRZTC = 28.7 kΩ unless otherwise noted. Typical operating condition is at VCC =3.3 V and TA = 25°C. PARAMETER VALUE CONDITION MIN Cross point stability 50-Ω load, single-ended, VIN = 180 mVPP, 600 mVPP and 1200 mVPP, VOUT = 1.2 VPP Cross point stability vs. input amplitude 50-Ω load, single-ended, VIN = 180 mVPP, 600 mVPP and 1200 mVPP, VOUT = 1.2 VPP BWAMP Bandwidth of AMP input TOFF Transmitter disable time –6 (3) Falling edge of DIS to VOUT+ ≥ 1.2 VPP Power-on to initialize Power-on to registers ready to be loaded (3) Initialize to transmit Register load STOP command to part ready to transmit valid data (3) 6 6 pp kHz 0.05 5 µs 1 ms 1 10 ms 2 ms (3) Disable negate time UNIT pp 2.5 Rising edge of DIS to VOUT+ ≤ 0.15 VPP TINIT1 (3) MAX ±5 TON TINIT2 TYP Assured by simulation over process, supply, and temperature variation. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 DETAILED DESCRIPTION EQUALIZER The data signal is applied to an input equalizer by means of the input signal pins DIN+ / DIN–, which provide onchip differential 100-Ω line-termination. The equalizer is enabled by setting EQENA to 1 (bit 1 of register 0). Equalization of up to 300-mm (12 in.) of microstrip or stripline transmission line on FR4 printed circuit boards can be achieved. The amount of equalization is digitally controlled by the 2-wire interface and control logic block and is dependant on the register settings EQADJ[0..7] (register 3). The equalizer can be turned off and bypassed by setting EQENA to 0. For details about the equalizer settings, see Table 16. LIMITER By limiting the output signal of the equalizer to a fixed value, the limiter removes any overshoot after the input equalization and provides the input signal for the output driver. Adjustments to the limiter bias current and emitter follower current can be made to trade off the rise and fall times and supply current. The limiter bias current is adjusted through LIMCSGN (bit 7 of register 6) and LIMC[0..2] (bits 4, 5 and 6 of register 6). The emitter follower current is adjusted through EFCSGN (bit 3 of register 6) and EFC[0..2] (bits 0, 1 and 2 of register 6). In addition, the slope of the emitter follower current can be modified with the EFCRNG bit (bit 3 of register 5). Setting EFCRNG to 1 results in a steeper slope. HIGH-SPEED OUTPUT DRIVER The modulation current is sunk from the common emitter node of the limiting output driver differential pair by means of a modulation current generator, which is digitally controlled by the 2-wire serial interface. The collector nodes of the output stages are connected to the output pins OUT+ and OUT–. The collectors have internal active back termination. The outputs are optimized to drive a 50-Ω single-ended load and to obtain the maximum single-ended output voltage of 1.5 VPP, AC coupling and inductive pullups to VCC are required. The active back termination emitter follower current is adjusted through ABTSGN (bit 3 of register 7) and ABTEF[0..2] (bits 0, 1 and 2 of register 7). ABTUP (bit 7 of register 7) and ABTDWN (bit 6 of register 7) can control the active back termination auxiliary buffer amplitude. Setting ABTUP to 1 increases the amplitude and setting ABTDWN to 1 decreases the amplitude. For most instances, these settings may be left in the default mode. For waveform shaping, output pre-emphasis can be enabled by setting PKENA to 1 (bit 5 of register 0) and adjusting the peaking height through PEADJ[0..3] (register 2). In addition, the polarity of the output pins can be inverted by setting the output polarity switch bit, POL (bit 2 of register 0) to 1. MODULATION CURRENT GENERATOR The modulation current generator provides the current for the current modulator described above. The modulation current generator is controlled by applying an analog voltage in the range of 0 to 2.5 V to the AMP pin, or it can be digitally controlled by the 2-wire interface block. The default method of control is through the AMP pin. To digitally control the output amplitude set AMPCTRL (bit 0 of register 0) to 1. An 8-bit wide control bus, AMP[0..7] (register 1), can be used to set the desired modulation current, and therefore, the output voltage. To decrease the output amplitude by approximately 18% set OARNG to 1 (bit 7 of register 5), to increase it by approximately 30 mVPP set OASH0 (bit 5 of register 5) to 1, or to increase it by approximately 60 mVPP set OASH1 (bit 6 of register 5) to 1. The modulation current, and therefore the output signal, can be disabled by setting the DIS input pin to a high level or by setting ENA to 0 (bit 7 of register 0). Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 7 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com DC OFFSET CANCELATION AND CROSS POINT CONTROL The ONET1151M has DC offset cancellation to compensate for internal offset voltages. The offset cancellation can be disabled and the eye crossing point adjustment enabled by setting CPENA to 1 (bit 3 of register 0). The crossing point can be moved toward the one level by setting CPSGN to 0 (bit 7 of register 4) and it can be moved toward the zero level by setting CPSGN to 1. The percentage of shift depends upon the register settings CPADJ[0..6] (register 4) and the high cross point adjustment range bits HICP[0..1] (bits 0 and 1 of register 5). Setting HICP0 and HICP1 to 1 results in the maximum adjustment range but increases the supply current. ANALOG REFERENCE AND TEMPERATURE SENSOR The ONET1151M modulator driver is supplied by a single 3.3-V ± 10% supply voltage connected to the VCC and VCCD pins. This voltage is referred to ground (GND) and can be monitored as a 10-bit unsigned digital word through the 2-wire interface. On-chip bandgap voltage circuitry generates a reference voltage, independent of the supply voltage, from which all other internally required voltages and bias currents are derived. An external zero temperature coefficient resistor must be connected from the RZTC pin of the device to ground. This resistor is used to generate a precise, zero-TC current which is required as a reference current for the onchip DACs. In order to minimize the module component count, the ONET1151M provides an on-chip temperature sensor. The temperature can be monitored as a 10-bit unsigned digital word through the 2-wire interface. POWER-ON RESET The ONE1151M has power on reset circuitry which ensures that all registers are reset to zero during startup. After the power-on to initialize time (tINIT1), the internal registers are ready to be loaded. The part is ready to transmit data after the initialize to transmit time (tINIT2), assuming that the chip enable bit ENA is set to 1 and the disable pin DIS is low. The DIS pin has an internal 10-kΩ pullup resistor so the pin must be pulled low to enable the outputs. The ONET1151M can be disabled using either the ENA control register bit or the disable pin DIS. In both cases the internal registers are not reset. After the disable pin DIS is set low and/or the enable bit ENA is set back to 1, the part returns to its prior output settings. ANALOG TO DIGITAL CONVERTER The ONET1151M has an internal 10-bit analog to digital converter (ADC) that converts the analog monitors for temperature and power supply voltage into a 10-bit unsigned digital word. The first eight most significant bits (MSBs) are available in register 14 and the two least significant bits (LSBs) are available in register 15. Depending on the accuracy required, eight bits or 10 bits can be read. However, due to the architecture of the 2wire interface, in order to read the two registers, two separate read commands have to be sent. The ADC is enabled by default. To monitor a particular parameter, select the parameter with ADCSEL (bit 0 of register 13). Table 2 lists the ADCSEL bits and the monitored parameters. Table 2. ADC Selection Bits and the Monitored Parameter ADCSEL Monitored Parameter 0 Temperature 1 Supply voltage If it is not desired to use the ADC to monitor the two parameters then the ADC can be disabled by setting ADCDIS to 1 (bit 7 of register 13) and OSCDIS to 1 (bit 6 of register 13). The digital word read from the ADC can be converted to its analog equivalent through the following formulas: Temperature without a mid point calibration: Temperature (°C) = 8 (ADCx - 264) 6 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 Temperature with a mid point calibration: Temperature (°C) = (T_cal (°C) + 273) ´ (ADCx + 1362) (ADC _ cal + 1362 ) - 273 Power supply voltage: Power supply voltage (V) = 2.25 ´ (ADCx + 1380) 1409 2-WIRE INTERFACE AND CONTROL LOGIC The ONET1151M uses a 2-wire serial interface for digital control. For example, the two circuit inputs, SDA and SCK, are respectively driven by the serial data and serial clock from a microprocessor. The SDA and SCK pins have internal 10-kΩ pullups to VCC. If a common interface is used to control multiple parts, the internal pullups can be set to 40 kΩ by setting HITERM to 1 (bit 6 of register 0). The internal pullup for the DIS pin is also set to 40 kΩ when HITERM is set to 1. The 2-wire interface allows write access to the internal memory map to modify control registers and read access to read out the control signals. The ONET1151M is a slave device only which means that it cannot initiate a transmission itself; it always relies on the availability of the SCK signal for the duration of the transmission. The master device provides the clock signal as well as the START and STOP commands. The protocol for a data transmission is as follows: 1. START command 2. 7-bit slave address (0001000) followed by an eighth bit which is the data direction bit (R/W). A zero indicates a WRITE and a 1 indicates a READ. 3. 8-bit register address 4. 8-bit register data word 5. STOP command Regarding timing, the ONET1151M is I2C™ compatible. The typical timing is shown in Figure 3 and complete data write and read transfers are shown in Figure 4. Parameters for Figure 3 are defined in Table 3. Bus Idle: Both SDA and SCK lines remain HIGH. Start Data Transfer: A START condition (S) is defined by a change in the state of the SDA line from HIGH to LOW while the SCK line is HIGH. Each data transfer is initiated with a START condition. Stop Data Transfer: A STOP condition (P) is defined by a change in the state of the SDA line from LOW to HIGH while the SCK line is HIGH. Each data transfer is terminated with a STOP condition. However, if the master still wishes to communicate on the bus, it can generate a repeated START condition and address another slave without first generating a STOP condition. Data Transfer: Only one data byte can be transferred between a START and a STOP condition. The receiver acknowledges the transfer of data. Acknowledge: Each receiving device, when addressed, is obligated to generate an acknowledge bit. The transmitter releases the SDA line and a device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge clock pulse. Setup and hold times must be taken into account. When a slave-receiver does not acknowledge the slave address, the data line must be left HIGH by the slave. The master can then generate a STOP condition to abort the transfer. If the slave-receiver does acknowledge the slave address but some time later in the transfer cannot receive any more data bytes, the master must abort the transfer. This is indicated by the slave generating the not acknowledge on the first byte to follow. The slave leaves the data line HIGH and the master generates the STOP condition. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 9 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com SDA tBUF tLOW tR tF tHDSTA tHIGH SCK P S S tHDSTA tHDDAT P tSUDAT tSUSTA tSUSTO Figure 3. I2C Timing Diagram Table 3. Timing Diagram Definitions Parameter Symbol SCK clock frequency fSCK Bus free time between STOP and START conditions tBUF 1.3 μs Hold time after repeated START condition. After this period, the first clock pulse is generated tHDSTA 0.6 μs Low period of the SCK clock tLOW 1.3 μs High period of the SCK clock tHIGH 0.6 μs Setup time for a repeated START condition tSUSTA 0.6 μs Data HOLD time tHDDAT 0 μs Data setup time tSUDAT 100 Rise time of both SDA and SCK signals tR Fall time of both SDA and SCK signals tF Setup time for STOP condition tSUSTO 10 Submit Documentation Feedback Min Max Unit 400 kHz ns 300 300 0.6 ns ns μs Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 Write Sequence 1 7 1 1 8 1 8 1 1 S Slave Address Wr A Register Address A Data Byte A P Read Sequence 1 7 1 1 8 1 1 7 1 1 8 1 1 S Slave Address Wr A Register Address A S Slave Address Rd A Data Byte N P Legend S Start Condition Wr Write Bit (bit value = 0) Rd Read Bit (bit value = 1) A Acknowledge N Not Acknowledge P Stop Condition Figure 4. Programming Sequence Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 11 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com REGISTER MAPPING The register mapping for register addresses 0 (0x00) through 15 (0x0F) are listed in Table 4 through Table 15. Table 16 describes the circuit functionality based on the register settings. Table 4. Register 0 (0x00) Mapping – Control Settings Register Address 0 (0x00) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ENA HITERM PKENA PKRNG CPENA POL EQENA AMPCTRL Table 5. Register 1 (0x01) Mapping – Modulation Amplitude Register Address 1 (0x01) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 AMP7 AMP6 AMP5 AMP4 AMP3 AMP2 AMP1 AMP0 Table 6. Register 2 (0x02) Mapping – Pre-Emphasis Adjust Register Address 2 (0x02) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 - - - - PEADJ3 PEADJ2 PEADJ1 PEADJ0 Table 7. Register 3 (0x03) Mapping – Equalizer Adjust Register Address 3 (0x03) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 EQADJ7 EQADJ6 EQADJ5 EQADJ4 EQADJ3 EQADJ2 EQADJ1 EQADJ0 Table 8. Register 4 (0x04) Mapping – Cross Point Adjust Register Address 4 (0x04) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CPSGN CPADJ6 CPADJ5 CPADJ4 CPADJ3 CPADJ2 CPADJ1 CPADJ0 Table 9. Register 5 (0x05) Mapping – CPA Settings Register Address 5 (0x05) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 OARNG OASH1 OASH0 - EFCRNG - HICP1 HICP0 Table 10. Register 6 (0x06) Mapping – Limiter Bias Current Adjust Register Address 6 (0x06) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 LIMCSGN LIMC2 LIMC1 LIMC0 EFCSGN EFC2 EFC1 EFC0 Table 11. Register 7 (0x07) Mapping – ABT – Emitter Follower Control Register Address 7 (0x07) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ABTUP ABTDWN - - ABTSGN ABTEF2 ABTEF1 ABTEF0 Table 12. Register 8 (0x08) – Register 12 (0x0C) Mapping – Not Used Register Address 8 (0x08) 12 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 - - - - - - - - Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 Table 13. Register 13 (0x0D) Mapping – ADC Settings Register Address 13 (0x0D) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ADCDIS OSCDIS - - - - - ADCSEL Table 14. Register 14 (0x0E) Mapping – ADC Output (Read Only) Register Address 14 (0x0E) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ADC9 ADC8 ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 Table 15. Register 15 (0x0F) Mapping – ADC Output (Read Only) Register Address 15 (0x0F) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 - - - - - - ADC1 ADC0 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 13 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com Table 16. Register Functionality Register Bit Symbol 7 ENA 6 HITERM SCK, SDA and DIS pin input termination select bit: 1 = 40 kΩ selected 0 = 10 kΩ selected 5 PKENA Output pre-emphasis enable bit: 1 = Pre-emphasis enabled (height controlled by register 2) 0 = Pre-emphasis disabled 4 PKRNG Output pre-emphasis range bit: 1 = High range enabled 0 = Default range 3 CPENA Cross point adjust enable bit: 1 = Cross point adjustment is enabled 0 = DC offset cancellation is enabled 2 POL Output polarity switch bit: 1: Pin 15 = OUT- and pin 14 = OUT+ 0: Pin 15 = OUT+ and pin 14 = OUT- 1 EQENA 0 AMPCTRL 7 AMP7 6 AMP6 5 AMP5 4 AMP4 3 AMP3 2 AMP2 1 AMP1 0 AMP0 7 - 6 - 5 - 0 1 2 3 14 Function Enable chip bit: 1 = Chip enabled 0 = Chip disabled Input equalizer enable bit: 1 = Equalizer enabled (boost controlled by register 3) 0 = Equalizer disabled Amplitude control selection bit: 1 = Amplitude control through the serial interface 0 = Amplitude control by an analog voltage input at AMP pin Output amplitude setting Output voltage: 300 mVPP to 1.5 VPP in 256 steps 4 - 3 PEADJ3 Pre-emphasis adjustment 2 PEADJ2 0 = no pre-emphasis 1 PEADJ1 > 0 = pre-emphasis added to output signal 0 PEADJ0 7 EQADJ7 6 EQADJ6 5 EQADJ5 4 EQADJ4 Maximum equalization for 00000000 3 EQADJ3 Minimum equalization for 11111111 2 EQADJ2 1 EQADJ1 0 EQADJ0 Equalizer adjustment setting Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 Table 16. Register Functionality (continued) Register 4 Bit Symbol 7 CPSGN Eye cross-point adjustment setting 6 CPADJ6 CPSGN = 0 (positive shift) 5 CPADJ5 Maximum shift for 1111111 4 CPADJ4 Minimum shift for 0000000 3 CPADJ3 CPSGN = 1 (negative shift) 2 CPADJ2 Maximum shift for 1111111 1 CPADJ1 Minimum shift for 0000000 0 CPADJ0 7 OARNG Output amplitude range bit: 1 = Decrease output amplitude by approximately 18% 0 = Default range 6 OASH1 Upper output amplitude shift bit: 1 = Output amplitude shifted upwards by approximately 60 mVPP 0 = Default 5 OASH0 Lower output amplitude shift bit: 1 = Output amplitude shifted upwards by approximately 30 mVPP 0 = Default 4 - 3 EFCRNG 2 - 1 0 HICP1 HICP0 7 LIMCSGN Limiter bias current sign bit: 1 = Decrease limiter bias current 0 = Increase limiter bias current 6 5 4 LIMC2 LIMC1 LIMC0 Limiter bias current selection bits: 000 = No change 111 = Maximum current change 3 EFCSGN Emitter follower current sign bit: 1 = Increase emitter follower current 0 = Decrease emitter follower current 2 1 0 EFC2 EFC1 EFC0 Emitter follower current selection bits: 000 = No change 111 = Maximum current change 7 ABTUP Active back termination auxiliary buffer amplitude control bit: 1 = Increase amplitude 0 = Default setting 6 ABTDWN Active back termination auxiliary buffer amplitude control bit: 1 = Decrease amplitude 0 = Default setting 5 - 4 - 3 ABTSGN Active back termination emitter follower current sign bit: 1 = Increase emitter follower current 0 = Decrease emitter follower current 2 1 0 ABTEF2 ABTEF1 ABTEF0 Active back termination emitter follower current selection bits: 000 = No change 111 = Maximum current change 5 6 7 Function Emitter follower current slope selection: 1 = Step slope 0 = Shallow slope High cross point adjustment range bits: 00 = Default adjustment range 11 = Maximum increase in the adjustment range Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 15 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com Table 16. Register Functionality (continued) Register 13 14 15 16 Bit Symbol Function 7 ADCDIS ADC disable bit: 1 = ADC disabled 0 = ADC enabled 6 OSCDIS ADC oscillator bit: 1 = Oscillator disabled 0 = Oscillator enabled 5 - 4 - 3 - 2 - 1 - 0 ADCSEL 7 ADC9 (MSB) 6 ADC8 5 ADC7 4 ADC6 3 ADC5 2 ADC4 1 ADC3 0 ADC2 7 - 6 - 5 - 4 - 3 - 2 - 1 ADC1 0 ADC0 (LSB) ADC input selection bits: 1 = Supply monitor 0 = Temperature sensor Digital representation of the ADC input source (read only) Digital representation of the ADC input source (read only) Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 APPLICATION INFORMATION Figure 5 shows a typical application circuit using the ONET1151M. The modulator must be AC coupled to the driver for proper operation. The output amplitude is controlled through the AMP pin and the rest of the functions are controlled through the 2-wire interface (SDA or SCK) by a microcontroller. DIS SDK SDA C1 0.1 F DIS VCCD SCK SDA VCC GND DIN+ DIN+ DIN- DIN- C3 0.1 F VCC ONET OUT+ MZ MOD+ OUT± MZ MOD- 1151M C2 0.1 F 16 Pin QFN C4 0.1 F VCC GND AMP BGV RZTC GND C5 0.1 F AMP RZTC 28.7 k Pullup inductors from MOD+ and MOD- to VCC are required. Figure 5. Differential AC Coupled Drive Layout Guidelines For optimum performance, use 50-Ω transmission lines (100-Ω differential) for connecting the signal source to the DIN+ and DIN- pins and 50-Ω transmission lines (100-Ω differential) for connecting the OUT+ and OUTmodulation current outputs to the modulator. The length of the transmission lines should be kept as short as possible to reduce loss and pattern-dependent jitter. In addition, VCCD can be connected to VCC and filtered from a common supply. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 17 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com TYPICAL CHARACTERISTICS Typical operating condition is at VCC = 3.3 V, TA = 25°C, VOUT = 1.5 VPP single ended, EQENA = 0, PKENA = 1 with PEADJ = 0x0F and VIN = 600 mVPP (unless otherwise noted). DETERMINISTIC JITTER vs MODULATION CURRENT DETERMINISTIC JITTER vs TEMPERATURE 6 8 5 6 ISI (pspp) ISI (pspp) 4 3 4 2 2 1 0 0 100 120 140 160 180 200 220 240 Amplitude Register Setting (Decimal) ±40 260 ±20 0 20 40 60 80 TA - Free-Air Temperature (ƒC) C001 Figure 6. Figure 7. RANDOM JITTER vs MODULATION CURRENT RANDOM JITTER vs TEMPERATURE 100 C002 0.4 0.8 0.6 Random Jitter (psrms) Random Jitter (psrms) 0.7 0.5 0.4 0.3 0.2 0.3 0.2 0.1 0.1 0.0 0.0 100 120 140 160 180 200 220 240 Amplitude Register Setting (Decimal) ±40 260 ±20 40 60 Figure 9. RISE-TIME AND FALL-TIME vs MODULATION CURRENT RISE-TIME AND FALL-TIME vs TEMPERATURE 80 100 C004 35 30 30 Fall Time Transition time (ps) Rise Time Transition Time (ps) 20 Figure 8. 35 25 Fall Time 20 15 10 5 25 Rise Time 20 15 10 5 0 0 100 120 140 160 180 200 Amplitude Register Setting (ƒC) 220 240 ±40 C005 Figure 10. 18 0 TA - Free-Air Temperature (ƒC) C003 ±20 0 20 40 60 TA - Free-Air Temperature (ƒC) 80 100 C006 Figure 11. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M ONET1151M www.ti.com SLLSED8 – OCTOBER 2012 TYPICAL CHARACTERISTICS (continued) Typical operating condition is at VCC = 3.3 V, TA = 25°C, VOUT = 1.5 VPP single ended, EQENA = 0, PKENA = 1 with PEADJ = 0x0F and VIN = 600 mVPP (unless otherwise noted). OUTPUT VOLTAGE vs AMP REGISTER SETTING 2.0 1.8 1.8 1.6 1.6 1.4 SE Output Voltage (V) SE Output Voltage (V) OUTPUT VOLTAGE vs AMP VOLTAGE 1.4 1.2 1.0 0.8 0.6 1.2 1.0 0.8 0.6 0.4 0.4 0.2 0.2 0.0 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 AMP Pin Voltage (V) 0 20 40 60 80 100 120 140 160 180 200 220 240 260 Amplitude Register Setting (Decimal) C007 Figure 12. Figure 13. SUPPLY CURRENT vs TEMPERATURE EYE-DIAGRAM AT 10.3GBPS VOUT=1.5VPP C008 150 140 Supply Current (mA) 130 120 110 100 90 80 70 60 50 ±40 ±20 0 20 40 60 80 TA - Free Air Temperature ( ƒC ) 100 500 mV/Div 15 ps/Div C009 Figure 14. Figure 15. EYE-DIAGRAM AT 11.3GBPS VOUT=1.5VPP, 50% CROSS POINT EYE-DIAGRAM AT 11.3GBPS VOUT=1.5VPP, 30% CROSS POINT 500 mV/Div 15 ps/Div 500 mV/Div Figure 16. 15 ps/Div Figure 17. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M 19 ONET1151M SLLSED8 – OCTOBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) Typical operating condition is at VCC = 3.3 V, TA = 25°C, VOUT = 1.5 VPP single ended, EQENA = 0, PKENA = 1 with PEADJ = 0x0F and VIN = 600 mVPP (unless otherwise noted). EYE-DIAGRAM AT 11.3GBPS VOUT=1.5VPP, EQ SET TO 00, 12’’ OF FR4 AT INPUTS EYE-DIAGRAM AT 11.3GBPS VOUT=1.5VPP, 70% CROSS POINT 500 mV/Div 15 ps/Div 500 mV/Div Figure 18. 20 15 ps/Div Figure 19. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: ONET1151M PACKAGE OPTION ADDENDUM www.ti.com 11-Aug-2022 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) ONET1151MRGTR ACTIVE VQFN RGT 16 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 100 1151M Samples ONET1151MRGTT ACTIVE VQFN RGT 16 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 100 1151M Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of