M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 Applications • Input equalization for up to 36" of FR4 + 2 connectors • 3G/HD/SD Video Switchers • Integrated, selectable 75 or 50 output termination • 3G/HD/SD Video Routers • Integrated 50 input termination • 3G/HD/SD Distribution Amplifiers • Integrated 2x2 crosspoint switch with broadcast mode • DVB-ASI Equipment • On-chip regulators for operation from 1.8V to 3.3V DC supply • SMPTE 259C/D, 292M, 424M, DVB ASI 270Mb/s • Universal DC coupling at the input, from 1.2V to 3.3V Features • Cable detect with automatic power down and power up upon cable disconnect and re-connect • Dual channel cable driver • Loss of input signal detection • Two pairs of non-inverting, SMPTE compliant outputs • Independent channel mute and power down • Typical output jitter of 12 ps peak–to–peak at 2.97 Gbps • Industrial operating temperature range: -40°C to 85°C • Exceptional Output Return Loss with no matching network • 4 kV HBM and 500V CDM ESD rating • Very low power design; 40 mW/channel @1.8V • 4 mm x 4 mm 24 pin QFN package • Selectable slew rate for SD and 3G/HD operation • Green and RoHS compliant The M21528 is a very low power, highly integrated, dual cable driver for SMPTE compliant digital video applications. It can drive 2 pairs of 75 coaxial cables, or 50 equivalent loads, at SDI data rates from 270 Mbps to 2.97 Gbps. The device is capable of outputting SDI signals with typical jitter values of 12 ps peak–to–peak, when operating at 2.97 Gbps. The dual cable driver includes a 2x2 input crosspoint and integrated input and output termination resistors. The M21528, with input equalization for up to 36" of FR4 trace in addition to two connectors and exceptional Output Return Loss (ORL), is ideal for high speed, 3G-SDI, designs. The device features integrated supply regulators, allowing it to be powered from 1.8V, 2.5V, or 3.3V supply voltages. When operating at 1.8V, it consumes only 40 mW per channel at 2.97 Gbps. Furthermore, the power rails for the input and output circuitry are electrically isolated on-chip and as such may be connected to different voltage rails on the board. This feature enables the M21528 to be DC coupled to any upstream device in the 1.2V to 3.3V range. The integrated 2x2 crosspoint allows for either input to be routed to either output, eliminating the need for an external multiplexer. Additionally, one input may be routed to both outputs. The cable driver also provides cable detect and Loss of Signal (LOS) functionality. It can be configured to automatically power down at cable disconnect or loss of input signal. The M21528 is offered in a green and RoHS compliant 24 pin QFN package. M21528 Block Diagram 75Ω/50Ω SDO0A 75Ω/50Ω SDO0B 75Ω/50Ω SDO1A 75Ω/50Ω SDO1B LOS SDI0P SDI0N IE 2x2 Crosspoint SDI1P SDI1N IE LOS 1 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 Ordering Information Part Number Package Operating Temperature M21528G-13 4 mm x 4 mm 24-pin QFN (RoHS compliant) –40 °C to 85 °C * The letter “G” designator after the part number indicates that the device is RoHS compliant. The RoHS compliant devices are backwards compatible with 225 °C reflow profiles. Revision History Revision Level Date V4 Release December 2015 V3 Release May 2015 E (V2) Release March 2010 D (V1) Release December 2009 C (V1P) Preliminary May 2009 B (V2A) Advance February 2009 A (V1A) Advance June 2008 Description Added footnotes to Figure 3-7. Revised Z_CTRL resistor value for 75 output impedance in Table 3-1. Revised Section 4.3. Updated Marking Diagram. Updated Figure 3-7 with new package diagram. Corrected Figure 3-7 center pad dimensions. Revised Table 1-5; DRIN min, JAO 3G, HD max. Added marking diagram. Added Eye Diagams in Section 2.0. Revised typical and Maximum values in Table 1-3. Revised Table 1-4. Revised Figure 3-2 and Figure 3-3. Added Note 5 to Table 1-5. Removed Note 2 from Table 3-1 (2-state/I-Digital inputs have an internal 100K resistor to AVDDI). Revised Figure 4-3, Figure 4-4, Figure 4-5. Added input/output circuits in Section 3.0. Major revisions throughout document. Initial Release. M21528 Marking Diagram 52813 XXXX .X YYWWCO Part Number Lot Number Date Country of Origin 2 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 Table of Contents Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.0 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.0 Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.0 Pinout Diagram, Pin Description, and Package Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 4.2 Input Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 4.3 Output Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 4.4 Power Supply Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 4.5 Logic Control Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 4.6 4.5.1 Slew Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.5.2 Crosspoint Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.5.3 Powerdown Mode Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Cable Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 3 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 1.0 Electrical Characteristics Unless noted otherwise, specifications apply for typical recommended operating conditions shown in Table 1-2, with AVDDO = 1.8V, AVDDI = 1.2V, CML inputs at 800 mV differential (RL = 50), PRBS 215 – 1 test pattern at 2.97 Gbps. Table 1-1. Absolute Maximum Ratings Symbol Parameter Note Minimum Typical Maximum Unit AVDDI Analog supply for input circuitry 1 -0.5 — 3.6 V AVDDO0/1 Analog supply for output circuitry 1 -0.5 — 3.6 V TST Storage Temperature 1 -65 — 150 ºC ESD Human Body Model (HBM) 1 -4 — 4 KV ESD Charge Device Model (CDM) 1 -500 — 500 V Latch Up @ 85ºC 1 -200 — 200 mA HSIC Maximum High-speed input current 1 -100 — 100 mA HSOC Maximum High-speed output short circuit current 1 -100 — 100 mA VINMAX Input voltage range 1 -0.5 — AVDDI+0.5 V Note Minimum Typical Maximum Unit LU NOTES: 1. Exposure to these conditions over extended periods of time may affect device reliability Table 1-2. Recommended Operating Conditions Symbol Parameter AVDDI Analog supply for input circuitry — 1.14 1.2, 1.8, 2.5, or 3.3 3.465 V AVDDO0/1 Analog supply for output circuitry — 1.71 1.8, 2.5, or 3.3 3.465 V TCASE Operating temperature 1 -40 25 +85 ESD Human Body Model (HBM) — -4 — 4 NOTES: 1. Case temperature. 4 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support o C kV M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Table 1-3. Power Consumption Specifications Symbol PDISS Rev V4 Parameter Conditions Total power consumption Note AVDDI = 1.2V Minimum Typical Maximum Unit 78 122 mW 61 95 mW 49 86 mW 1 AVDDO = 1.8V — Both channels active, 4 outputs on 1 AVDDI = 1.2V AVDDO = 1.8V — Both channels active, one output per channel on 1 AVDDI = 1.2V AVDDO = 1.8V — One channel active, one output on I_ AVDDI Total AVDDI supply current AVDDI = 1.2V 1 — 1 3.0 mA I_ AVDDI Total AVDDI supply current AVDDI = 1.8V 1 — 3 7.0 mA I_ AVDDI Total AVDDI supply current AVDDI = 3.3V 1 — 10 17.0 mA I_ AVDDO Total AVDDO supply current Both channels active 1,2 — 43 68.0 mA I_ AVDDO Total AVDDO supply current Only channel 0 active 1,2 — 43 68.0 mA I_ AVDDO0 Total AVDDO0 supply current Only channel 1 active 1,2 — 27 49.0 θJA Junction to ambient Thermal Resistance 3 — mA o — 63 C/W Note Minimum Typical Maximum Unit NOTES: 1. Recommended operating condition—see Table 1-2. 2. Current consumption does not change with AVDDO = 1.8V, 2.5V or 3.3V. 3. Airflow = 0 m/s. Table 1-4. Digital Input Specifications Symbol Parameter VIH Input Logic High — 0.85 x AVDDI — AVDDI + 0.5 V VIF Input Logic Floating State — 0.25 x AVDDI — 0.75 x AVDDI V VIL Input Logic Low — 0 — 0.15 x AVDDI V IIH Input Current—Logic High — -100 — 100 A IIL Input Current—Logic Low — -100 — 100 A 5 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Table 1-5. Rev V4 High Speed Input/Output Electrical Specifications Symbol Parameter Note Minimum Typical Maximum Unit 1 730 800 850 mV 1,3,4 400 600 800 ps 1 — 70 90 ps 1,3,4 — — 125 ps VO Output Voltage Range tr/tf SD Rise/Fall Time (20–80%) tr/tf 3G/HD Rise/Fall Time (20–80%) tr-tf SD Rise/Fall Time Mismatch tr-tf 3G/HD Rise/Fall Time Mismatch 1,3 — — 30 ps DCD Duty Cycle Distortion, SD 1,4 — — 100 ps DCD Duty Cycle Distortion, 3G, HD 1,3 — — 30 ps 1,2,4 — 60 100 ps JAOPP Additive Output Jitter, SD JAOPP Additive Output Jitter, 3G, HD 1,2 — 12 29 ps S22 Output Return Loss (5 MHz to 1.5 GHz) 6,8 20 — — dB S22 Output Return Loss (5 MHz to 3.0 GHz) 5,8 11 — — dB S22 Output Return Loss (5 MHz to 3.0 GHz) 6,8 14 — — dB DRIN Input Data rate — 270 — 2970 Mbps VID Differential Input Voltage (p–p) 7 400 — 1600 mV VIC Input Common mode range — AVDDI – 0.6 — AVDDI + 0.1 V IE Input Equalizer Gain Off (EN_EQ = 0) — — 0 — dB Input Equalizer Gain Med (EN_EQ = F) — — 4 — dB Input Equalizer Gain High (EN_EQ = H) — — 6 — dB Input Termination to AVDDI — 40 50 60 RINT NOTES: 1. Measured AC coupled into 1m coaxial cable, terminated with appropriate 75 or 50 load. 2. Measured with PRBS 215-1 test pattern. 3. For data rates above 360 Mb/s, the cable driver must be in HD mode (SD/xHD = 0). 4. SD/xHD = 1, measured at 270 Mb/s. 5. Without external matching network. 6. With external matching network Rmatching=75, Lmatching=1nH, only applicable to 75 mode. 7. EQ_EN = L (input equalization off) PD_MODE = F (LOS enabled), point blank. 8. As measured on MACOM EVM at BNC connector with output impedance set to 75. 6 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 2.0 Typical Performance Characteristics Figure 2-1. Eye Diagram at 270 Mbps Figure 2-3. Eye Diagram at 2970 Mbps Figure 2-2. Eye Diagram at 1485 Mbps 7 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 3.0 Pinout Diagram, Pin Description, and Package Drawing SDO0B 17 AVDDReg0 16 AVDDO0 15 AVDDO1 14 AVDDReg1 13 SDO1B SD/xHD0 PD0 Z_CTRL XPT_CTRL AVDDReg0 SDO0A 23 22 21 20 19 5 10 11 12 AVDD Reg1 SDO1A 6 PD_MODE SDI1N 4 9 SDI1P M21528 4mmX4mm QFN AVDD I EN_EQ1 3 8 EN_EQ0 18 2 PD1 SDI0N 1 7 SDI0P 24 Pinout Diagram (Top View) SD/xHD1 Figure 3-1. 8 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Table 3-1. Rev V4 Pin Description (1 of 2) Pin Name Pin Number Type Description AVSS Center Ground Paddle Power Chip Ground AVDDI 9 Power Positive supply for inputs circuitry AVDDReg0 17,20 Power Regulator0 bypass capacitor connection, positive supply for output0 AVDDReg1 11,14 Power Regulator1 bypass capacitor connection, positive supply for output1 AVDDO0 16 Power Positive supply for reglator0 AVDDO1 15 Power Positive supply for reglator1 SDO0A 19 O-Analog High speed serial output, channel0, output A SDO0B 18 O-Analog High speed serial output, channel0, output B SDO1A 12 O-Analog High speed serial output, channel1, output A SDO1B 13 O-Analog High speed serial output, channel1 output B SDI0P/N 1,2 I-Analog High speed serial video data input, channel0 SDI1P/N 5,6 I-Analog High speed serial video data input, channel1 Z_CTRL 22 I-Analog Sets output impedance through an external Z_CTRL resistor connected to AVSS Z_CTRL=665 to set 75 output impedance Z_CTRL=250 to set 50 output impedance SD/xHD0 24 I-DIGITAL Output slew rate control for channel 0 L = SDO0 has 3G/HD slew rate H = SDO0 has SD slew rate SD/xHD1 7 I-DIGITAL Output slew rate control for channel 1 L = SDO1 has 3G/HD slew rate H = SDO1 has SD slew rate PD0 23 3-state/I-DIGITAL Power down control for channel 0 L = SDO0A on, SDO0B power down F = Both outputs on H = Power down both outputs PD1 8 3-state/I-DIGITAL Power down control for channel 1 L = SDO1A on, SDO1B power down F = Both outputs on H = Power down both outputs XPT_CTRL 21 3-state/I-DIGITAL Crosspoint control L = SDI0 to SDO1, SDI1 to SDO0 F = SDI0 to SDO0, SDI1 to SDO1 H = SDI0 to SDO0 and SDO1 9 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Table 3-1. Rev V4 Pin Description (2 of 2) Pin Name Pin Number Type Description PD_MODE 10 3-state/I-DIGITAL Power down and cable detect control L = Cable detect disabled, PD upon LOS disabled F = Cable detect enabled, PD upon LOS enabled H = Cable detect enabled, PD upon LOS disabled EN_EQ0 3 3-state/I-DIGITAL Input equalization control for channel 0 L = No Input Equalization on SDI0P/N F = Medium Input Equalization on SDI0P/N H = High Input Equalization on SDI0P/N EN_EQ1 4 3-state/I-DIGITAL Input equalization control for channel 1 L = No Input Equalization on SDI1P/N F = Medium Input Equalization on SDI1P/N H = High Input Equalization on SDI1P/N NOTES: 1. 3-state inputs have a default of F (floating). 2. A Z_CTRL resistance of 665 will also provide 800mVpp output swing. Figure 3-2. Differential Input (SDIP, SDIN) AVDDI 50Ω SDIP AVSS Input Buffer with Trace Equalizer AVDDI 50Ω SDIN AVSS 10 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Figure 3-3. Rev V4 Single-Ended Output (SDO0A, SDO0B, SDO1A, SDO1B) AVDDReg 50Ω / 75Ω Set by Z _CTRL SDO AVSS Figure 3-4. Digital Input Pin (SD/xHD0, SD/xHD1) AVDDI 2.0kΩ INPUT AVSS 11 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Figure 3-5. Rev V4 State Logic Input (PD0, PD1, XPT_CTRL, PD_MODE, EN_EQ0, EN_EQ1) AVDD I VREF_LOW AVDD I 2.0kΩ INPUT AVSS AVDD I AVSS VREF_HIGH AVSS The M21528 is assembled in 24 pin 4 mm x 4 mm Quad Flat No-Lead (QFN) package. The exposed die paddle serves as the IC ground (AVSS), and the primary means of thermal dissipation. This die paddle should be soldered to the PCB ground. A cross-section of the QFN package can be found in Figure 3-6. Figure 3-6. QFN Package Cross Section Mold Compound Ag Plating Die Solder Plating Gold Wire Cu Leadframe Down Bond Exposed Die Paddle Ground Bond Die Attach Material 12 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Figure 3-7. 13 Rev V4 Package Drawing 1. For dimension reference A, Min. is 0.800, Nom. is 0.850 and Max. is 0.900. 2. New Unisem package and old Amkor package have the same footprint dimensions. M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 4.0 Functional Description 4.1 Block Diagram Figure 4-1 is the functional block diagram of the M21528. The subsequent sections provide additional detail on the operation of the device. AVDD O1 AVDD O0 Regulator Z_CTRL PD1 PD0 SD/xHD1 SD/xHD0 XPT_CTRL PD_MODE EN_EQ1 EN_EQ0 AVDD Reg1 AVDD Reg0 M21528 Functional Block Diagram AVDD Reg1 AVDD Reg0 Figure 4-1. Control Logic Cable Detect Z Control LOS R SDO0A R SDO0B R SDO1A R SDO1B AV DDI 2 x2 SDI0P SDI0N Xpoint Input Buff & FR4 EQ SDI1P SDI1N 14 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver 4.2 Rev V4 Input Description The M21528 has differential inputs, with integrated 50 pull ups to AVDDI. AVDDI may be supplied from a 1.2V, 1.8V, 2.5V, or 3.3V supply. The input buffers are compatible with PCML, LVDS or LVPECL signal levels. To improve signal integrity in large systems, all inputs have programmable input equalization (IE) with three gain levels: 0 dB, 4 dB, 6 dB. Setting the gain to 0dB effectively disables the IE feature. The pins EN_EQ0 and EN_EQ1 allow for the selecting the proper level of input equalization based on the board characteristics for each input. The maximum level of equalization compensates for up to 36” of FR4 trace. The operation of the EN_EQ0/1 pin is summarized in Table 4-1 below. Table 4-1. Pin EN_EQ0 EN_EQ1 Operation of EQ_EN0 and EQ_EN1 Pins Level Function L SDI0P/N IE EQ gain = 0 dB F SDI0P/N IE EQ gain = 4 dB H SDI0P/N IE EQ gain = 6 dB L SDI1P/N IE EQ gain = 0 dB F SDI1P/N IE EQ gain = 4 dB H SDI1P/N IE EQ gain = 6 dB In 3G/HD/SD SDI applications, it is best to avoid AC coupling data interfaces between devices, if possible. DC coupling will result in increased system jitter margin. Also, DC coupling eliminates the requirement for additional components on the board. In order to accommodate DC coupling to the upstream device, the AVDDI domain of the M21528 is electrically isolated from all other power domains on chip. This allows for it to be tied to the VDD of the previous device’s driver enabling a fully DC coupled system, as shown below. Upstream VDD 50 1.2V – 3.3V M21528 AVDDI 50 15 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 Alternatively, a “self-biasing” scheme can be used at the input. This offers the benefit of having the VDD of the previous device and the power domain(s) of the M21528 completely separated, while allowing dc coupling: Previous device VDD 50 M21528 AVDDI 0.1uF 50 In this configuration, the minimum input common mode that can be tolerated, is 1.2V. If, for any reason, AC coupling is necessary, then a capacitor of 4.7 µF or greater must be used. A Loss of Signal (LOS) detector circuit monitors each input and issues an internal alarm when the input signal goes below the detection threshold. The detection threshold is 90 mVpp with +90 mV hysteresis. This means that if the input signal level drops below 90 mVpp, then the internal LOS alarm is asserted. For the alarm to be de-asserted, the input signal must increase to greater than 180 mVpp; the hysteresis prevents the internal LOS alarm from chattering. Depending on the state of the PD_MODE pin, the LOS alarm at a particular input can power down the associated signal path and forces the corresponding output to low level. 4.3 Output Description The M21528 contains two independent signal channels, each with two positive polarity cable driver outputs. Unlike conventional SMPTE compliant cable drivers, the M21528 uses a voltage mode implementation as opposed to current mode. This allows for significant power savings when compared to previous generation cable drivers with the added benefit of two positive polarity outputs per channel. Internally an output buffer drives a 1.6V amplitude signal through an integrated impedance load. The impedance of the load is set by the external Z_CTRL resistor to AVSS. For most applications Z_CTRL should be 665, which sets the output load to 75 and provides 800mVpp output swing. If the application requires a 50 output impedance, Z_CTRL may be 250. In both cases Z_CTRL must have 1% tolerance. The M21528 can meet SMPTE ORL specifications without the need for an external matching network. However, for additional margin a matching network consisting of a 75 resistor and a 1 nH inductor may be used. Each channel has a dedicated power down pin, PD0 and PD1. The operation of the PD pin is summarized in Table 4-2 below. When powered down, the signal at the output is set to low. 16 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Table 4-2. Operation of PD0 and PD1 Pins Pin Level PD0 L SDO0A on, SDO0B powered down F Both SDO0A and SDO0B on H Both SDO0A and SDO0B powered down L SDO1A on, SDO1B powered down F Both SDO1A and SDO1B on H Both SDO1A and SDO1B powered down PD1 Rev V4 Function Figure 4-2 shows a typical output circuit. When the cable detect function is enabled, only the outputs used need to be connected, unused outputs may be left floating. However, if the cable detection function is disabled, unused outputs must be powered down or properly terminated. Figure 4-2. Typical Output Circuit (all outputs connected) Circuit A SDO0A 4.7 µF M21528 SDO0B SDO1A SDO1B Circuit A Circuit A Circuit A 17 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver 4.4 Rev V4 Power Supply Description The device features two internal regulators to supply the power for the output drivers for each channel. AVDDO0 and AVDDO1 supply the voltage to each channel’s respective regulator. These pins may be connected to DC voltages ranging from 1.8V to 3.3V. Each regulator requires an external 1µF bypass capacitor to ground, which must be connected to AVDDReg0 and AVDDReg1. It is recommended to add a secondary 10 nF bypass capacitor on each regulator output as close to the pin as possible. In addition to supplying the output stage for channel1, AVDDO1 is also used to power the core circuitry for both channels. A completely separate supply domain, AVDDI, provides the supply for the high-speed serial input pins. The input termination and ESD protection for the SDI pins and the digital control input pins are referenced to this supply. The isolated domain allows DC coupling to an upstream device that is running from a different supply voltage. For example, if, in order to save power, AVDDO0/1 are connected to 1.8V, but the cable driver must interface to a reclocker that uses a 3.3V supply, then DC coupling can be achieved by simply connecting AVDDI to the 3.3V rail. Figure 4-3 to 4-5 show three examples of how the cable driver can be configured. Note that even when only one channel is enabled, both output regulators must be supplied with the correct voltage. Figure 4-3. Supply configuration, both channels and both A and B outputs used 1.2V to 3.3V PD0 PD1 AVDD I AVDDReg0 1.8V to 3.3V 1μF AVDDO1 10 nF AVDDReg1 0.1uF AVDDO0 1μF 10 nF 18 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Figure 4-4. Rev V4 Supply configuration, channel0, outputs A and B used, channel 1 powered down 1.2V to 3.3V PD0 PD1 AVDD I AVDDReg0 1.8V to 3.3V 1μF 10 nF AVDD O1 AVDDReg1 0.1uF Figure 4-5. 1μF AVDDO0 10 nF Supply configuration, both channels used, but only A outputs used 1.2V to 3.3V PD0 PD1 AVDD I AVDDReg0 1.8V to 3.3V 1μF 10 nF AVDDO1 AVDDReg1 0.1uF AVDDO0 1μF 10 nF 19 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver 4.5 Rev V4 Logic Control Signals The digital logic control signals are ESD protected and referenced to the AVDDI. This allows the device to interface to many different logic levels from different supply domains. Some pins have a state called “F”; this stands for “floating”. To assert this state leave the pin unconnected. 4.5.1 Slew Rate Control Pins SD/xHD0 and SD/xHD1 control the slew rate of the associated channel outputs. To comply with the SMPTE SD specification the slew rate is slowed down to approximately 600 ps when in SD mode. Note that there is no pullup on the SD/xHD pins, so it should not be left floating. Table 4-3. Operation of SD/xHD0 and SD/xHD1 Pins Pin Level SD/xHD0 L Set SDO0A/B Slew rate to 3G/HD Levels H Set SDO0A/B Slew rate to SD Levels L Set SDO1A/B Slew rate to 3G/HD Levels H Set SDO1A/B Slew rate to SD Levels SD/xHD1 4.5.2 Function Crosspoint Control The XPT_CTRL pin controls the 2 x 2 crosspoint at the input. It can be used to redirect the input signal to the other output or from channel 0 to make broadcast mode, so the input on channel 0 appears on both channel 0 and 1 outputs. This last mode is useful in distribution amplifiers where one input can drive fours positive outputs. The crossover feature can be used in routers to select a second input bank. The functionality of the XPT_CTRL pin is summarized in the table below. Table 4-4. Operation of XPT_CTRL Pin Pin Level XPT_CTRL L Function Crossover mode: SDI0 routed to SDO1 SDI1 routed to SDO0 F Default mode: SDI0 routed to SDO0 SDI1 routed to SDO1 H Broadcast mode: SDI0 routed to SDO0 and SDO1 20 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver 4.5.3 Rev V4 Powerdown Mode Control The M21528 has integrated output cable detection and input LOS detection circuitry. Depending on the setting of the PD_MODE pin, the device can automatically power down each channel when output cables are disconnected or there is no signal present at the input. The functionality of the PD_MODE pin is summarized in the table below. Table 4-5. Operation of PD_MODE Pin Level PD_MODE L Function Cable detection disabled Power down on LOS disabled F Cable detection enabled Power down on LOS enabled H Cable detection enabled Power down on LOS disabled 4.6 Cable Detection The M21528 features an integrated near-end cable detector. This circuit can detect whether a cable has been disconnected from an output and whether or not it is reconnected without requiring any additional external components. Utilizing the cable detection feature has several system level advantages such as: • Reduced power consumption when no cable is connected to both outputs of a single channel • Reduced EMI • Eliminate the requirement for external termination Depending on the state of the PD_MODE pin, when both output A and B of either channel are disconnected, the device can automatically power down the channel resulting in a 75% power reduction for that channel. Furthermore, if output B is manually powered down (PD = L), then disconnecting output A will result in completely powering down the channel (both outputs). Due to the detection mechanism, the signal at each output within a channel will experience a phase step of approximately 15 ps when the other output’s state is changed: powered down, powered up, disconnected, or reconnected. If one output is disconnected but the other remains connected, and both outputs are toggling, the signal at the connected output may experience up to 10% overshoot for a period of approximately 500 ns. The overshoot is caused by the reflections coupled from the unconnected output to the connected one. 500 ns is the duration required by the circuit to detect the disconnection. If cable detection is disabled and the output is not properly terminated, the overshoot will persist. Therefore, it is strongly recommended to enable cable detection, or terminate both outputs properly; when both outputs of one channel are turned on. The cable detection function may be disabled by setting PD_MODE=L. 21 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M21528-13 Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver Rev V4 M/A-COM Technology Solutions Inc. All rights reserved. Information in this document is provided in connection with M/A-COM Technology Solutions Inc ("MACOM") products. These materials are provided by MACOM as a service to its customers and may be used for informational purposes only. 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MACOM customers using or selling MACOM products for use in such applications do so at their own risk and agree to fully indemnify MACOM for any damages resulting from such improper use or sale. 22 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support