GS1545

HD-LINX ™ GS1545 HDTV Serial Digital Equalizing Receiver PRELIMINARY DATA SHEET FEATURES • SMPTE 292M compliant • 1.485 and 1.485/1.001Gb/s operation • integrated adaptive cable equalizer • integrated adjustment-free reclocker • 1:20 serial to parallel conversion • selectable reclocked serial output • analog/digital input MUX • carrier detect • LOCK detect • input jitter indicator (IJI) • cable length indication • maximum cable length adjust • 20 bit output • 74.25MHz or 74.25/1.001MHz clock output • single +5.0V power supply • minimal component count for HD SDI receive solutions APPLICATIONS SMPTE 292M Serial Digital Interfaces for Video Cameras, Camcorders, VTR's, Signal Generators, Portable Equipment, and NLE's. DESCRIPTION The GS1545 is a high performance integrated Equalizing Receiver designed for HDTV component signals, conforming to the SMPTE 292M standard. The GS1545 includes adjustment free, adaptive cable equalization, clock and data recovery, and serial to parallel conversion. The Equalizer stage features DC restoration for immunity to the DC content in pathological test patterns. The Clock and Data Recovery stage was designed to automatically recover the embedded clock signal and retime the data from SMPTE 292M compliant digital video signals. There is also a selectable reclocked serial data output and the ability to bypass the reclocker stage. A unique feature, Input Jitter Indicator (IJI), is included for robust system design. This feature is used to indicate excessive input jitter before the chip mutes the outputs. The Serial to Parallel conversion stage provides 1:20 S/P conversion The GS1545 uses the GO1515 external VCO connected to the internal PLL circuitry to achieve ultra low noise PLL performance. ORDERING INFORMATION PART NUMBER GS1545-CQR PACKAGE 128 pin MQFP TEMPERATURE 0°C to 70°C GS1545 SDOint SDI SDI EQUALIZER CORE SDOint ANALOGDIGITAL MUX & BUFFER RECLOCKER CORE S/P CONVERTER DATA_OUT[19:0] PCLK_OUT BUFFER2 SDO SDO DDI DDI_VTT DDI (opt) A/D SDO_EN SIMPLIFIED BLOCK DIAGRAM Revision Date: August 2000 GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946 E-mail: info@gennum.com www.gennum.com Document No. 522 - 28 - 00 GO1515 CD CLI LFA LFS LFS PLCAP PLCAP IJI MCLADJ CABLE LENGTH INDICATOR MAXIMUM CABLE LENGTH ADJUST CARRIER DETECT CHARGE PUMP PHASE LOCK LOGIC PLL_LOCK GS1545 SDI SDI EQ CORE DC RESTORE BUFFER1 AGC VCO PHASE DETECTOR PCLK_OUT S/P CONVERTER CORE MUTE SDOint+ SDOintBYPASS MUX ANALOGDIGITAL MUX & BUFFER RECLOCKER CORE DDI DDI_VTT DDI (opt) A/D BYPASS SDO_EN BUFFER2 SDO SDO DATA_OUT[19:0] EQUALIZER CORE FUNCTIONAL BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise shown. PARAMETER Supply Voltage (VS) Input Voltage Range (any input) Operating Temperature Range Storage Temperature Range Power Dissipation (VCC = 5.25V) Lead Temperature (soldering 10 seconds) Input ESD Voltage Junction Temperature VALUE 5.5V VEE – 0.5 < VIN < VCC+ 0.5 0°C ≤ TA ≤ 70°C -40°C ≤ TS ≤ 150°C 2.1W 260°C TBD 125°C 2 GENNUM CORPORATION 522 - 28 - 00 DC ELECTRICAL CHARACTERISTICS VCC = 5V, VEE = 0V, TA = 0°C to 70°C, Data Rate = 1.485Gb/s. PARAMETER Positive Supply Voltage Power Consumption Supply Current Output CM Voltage (SDO, SDO) Input DC Voltage (DDI, DDI) Input DC Voltage (SDI, SDI) Serial Inputs (DDI, DDI) CONDITIONS Operating range VCC = 5; TA = 25°C VCC = 5; TA = 25°C SYMBOL VCC PD IS VCM MIN 4.75 3.75 - TYP 5.00 1250 250 4.0 4.0 2.7 - MAX 5.25 4.25 1000 VCC-VSID/2 - UNITS V mW mA V V V mV V V TEST LEVEL 1 5 GS1545 1 5 1 1 7 7 1 Differential mode Common mode VSID VCM VIH 100 2.5+VSID/2 2.0 High Level Input Voltage (A/D, BYPASS) Low Level Input Voltage (A/D, BYPASS) High Level Output Voltage (D[19:0], PCLK) Low Level Output Voltage (D[19:0], PCLK) High Level Output Voltage (PLL_LOCK) Low Level Output Voltage (PLL_LOCK) Low Level Output Voltage (CD) CLI DC Voltage CLI DC Voltage (max cable length) MCLADJ DC Voltage MCLADJ DC Voltage (max cable length) TEST LEVELS VCC = 5, TA = 25°C VCC = 5, TA = 25°C VCC = 5, TA = 25°C, ISOURCE = 1.0mA VCC = 5, TA = 25°C, ISINK = 1.0mA VCC = 5, TA = 25°C, ISOURCE = 200µA VCC = 5, TA = 25°C, ISINK = 500µA ISINK = 500µA 1 meter, 800mV p-p Input 100 meters, 800mV p-p Input VIL VOH - - 0.8 V 1 2.4 - 3.0 V 1 VOL - - 0.4 V 1 VOH 3.0 - - V 1 VOL - - 0.4 V 1 VOL - 0.2 3.3 1.3 - V V V 1 1 1 1 meter, 800mV p-p Input 100 meters, 800mV p-p Input - 4.1 3.1 - V V 1 1 1. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges. 2. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges using correlated test. 3. Production test at room temperature and nominal supply voltage. 4. QA sample test. 5. Calculated result based on Level 1,2, or 3. 6. Not tested. Guaranteed by design simulations. 7. Not tested. Based on characterization of nominal parts. 8. Not tested. Based on existing design/characterization data of similar product. 3 GENNUM CORPORATION 522 - 28 - 00 AC ELECTRICAL CHARACTERISTICS - RECLOCKER STAGE VCC = 5V, TA = 0°C to 70°C unless otherwise shown. PARAMETER Serial Input – Data Rate Serial Input – Jitter Tolerance Phase Lock Time Asynchronous Phase Lock Time Synchronous Carrier Detect Timer CONDITIONS SMPTE 292M Sinewave Modulation (p – p) Loop bandwidth approximately 1.4MHz @ 0.2 UI input jitter modulation (LBCONT floating). Loop bandwidth approximately 1.4MHz @ 0.2 UI input jitter modulation (LBCONT floating). Loop bandwidth approximately 1.4MHz @ 0.2 UI input jitter modulation (LBCONT floating). Loop bandwidth approximately 1.4MHz @ 0.2 UI input jitter modulation (LBCONT floating). SYMBOL BRSDI JTOL TALOCK MIN 1.485/1.001 - TYP 1.485 0.5 200 MAX 250 UNITS Gb/s UI ms TEST LEVEL 1 1 7 GS1545 TSLOCK - 2 4 µs 7 - 12 - ms 7 Phase Lock/Unlock Timer (1nF PLCAP) Serial Output – Signal Swing Serial Digital Output – Rise and Fall Time Serial Digital Output – Rise and Fall Time Mismatch Serial Digital Output – Intrinsic Jitter Loop bandwidth 60 - - µs 7 VSDO tR-SDO, tF-SDO 320 - 400 150 480 270 mV ps 1 7 - - 100 ps 7 (RMS Jitter for clean PRN 2 input on DDI/DDI inputs) @ 0.2UI jitter modulation LBCONT floating 23 –1 tIJ - 10 - ps 2 - 1.4 - MHz 7 Jitter peaking TEST LEVELS - - 0.1 dB 7 1. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges. 2. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges using correlated test. 3. Production test at room temperature and nominal supply voltage. 4. QA sample test. 5. Calculated result based on Level 1,2, or 3. 6. Not tested. Guaranteed by design simulations. 7. Not tested. Based on characterization of nominal parts. 8. Not tested. Based on existing design/characterization data of similar product 4 GENNUM CORPORATION 522 - 28 - 00 AC ELECTRICAL CHARACTERISTICS - EQUALIZER STAGE VCC = 5V, TA = 0°C to 70°C unless otherwise shown. PARAMETER Equalization Input Resistance (SDI, SDI) Input Capacitance (SDI, SDI) CONDITIONS Belden 1694A SYMBOL MIN - TYP 110 2.8 2.0 MAX - UNITS m kΩ pF TEST LEVEL 2 7 7 CIN - GS1545 AC ELECTRICAL CHARACTERISTICS - SERIAL TO PARALLEL STAGE VCC = 5V, TA = 0°C to 70°C unless otherwise shown. PARAMETER Parallel Output Clock Frequency Clock Pulse Width Low Clock Pulse Width High Output signal Rise/Fall time Output Signal Rise/Fall Time Matching Output Setup Time Output Hold Time CONDITIONS SMPTE 292M 15pF load 15pF load 15pF load 15pF load 15pF load 15pF load SYMBOL PCLK_OUT tPWL tPWH tr, tf trfm tOD tOH MIN 74.25/1.001 5 5 4 5 TYP 74.25 7 6 2000 1000 6 7 MAX 4000 2000 - UNITS MHz ns ns ps ps ns ns TEST LEVEL 1 7 7 7 7 2 2 TEST LEVELS 1. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges. 2. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges using correlated test. 3. Production test at room temperature and nominal supply voltage. 4. QA sample test. 5. Calculated result based on Level 1,2, or 3. 6. Not tested. Guaranteed by design simulations. 7. Not tested. Based on characterization of nominal parts. 8. Not tested. Based on existing design/characterization data of similar product. 5 GENNUM CORPORATION 522 - 28 - 00 GS1545 GENNUM CORPORATION PIN CONNECTIONS PLL_LOCK DFT_VEE LFA_VCC LFA_VEE LBCONT PLCAP PLCAP VCO VCO LFS LFS LFA DM DM NC NC NC NC NC NC NC NC 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 NC 101 NC 100 NC 99 NC 97 NC NC NC NC NC NC NC NC NC NC NC IJI 98 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 NC NC BYPASS DDI_VTT NC DDI DDI PD_VCC A/D PDSUB_VEE PD_VEE NC NC NC EQI_VCC NC NC EQI_VEE NC SDI NC SDI NC EQI_VEE NC NC 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 DATA_OUT[19] DATA_OUT[18] DATA_OUT[17] DATA_OUT[16] DATA_OUT[15] DATA_OUT[14] NC NC DATA_OUT[13] DATA_OUT[12] DATA_OUT[11] DATA_OUT[10] NC NC DATA_OUT[9] DATA_OUT[8] DATA_OUT[7] DATA_OUT[6] DATA_OUT[5] DATA_OUT[4] DATA_OUT[3] DATA_OUT[2] DATA_OUT[1] DATA_OUT[0] NC NC GS1545 TOP VIEW 6 522 - 28 - 00 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 1 NC 2 NC 3 NC 4 NC 5 MCLADJ 6 NC 7 CLI 8 NC 9 NC NC NC CD EQO_VEE NC NC EQO_VCC SDO SDO SDO_VEE SDO_EN SDO_VCC NC NC NC NC NC NC NC NC SP_VCC SP_VCC SP_VEE SP_VEE PCLK_OUT PCLK_VCC PCLK_VEE NC NC PIN DESCRIPTIONS NUMBER 1, 2, 3, 4, 6, 8, 9, 10, 11, 14, 15, 22, 23, 24, 25, 26, 27, 28, 29, 37, 38, 39, 40, 51, 52, 57, 58, 65, 66, 67, 68, 69, 70, 71, 77, 78, 82, 83, 84, 87, 88, 90, 92, 94, 95, 97, 99, 100, 101, 102, 103, 104, 107, 114, 115, 116, 118, 119, 121, 123, 125, 127, 128 5 SYMBOL NC LEVEL TYPE DESCRIPTION No Connect. Leave these pins floating. GS1545 MCLADJ Analog Input Control Signal Input. Adjusts the maximum amount of cable for the equalizer (from 0m to the maximum cable length). Normally the output is muted (latched to the last state) when the set maximum cable length is exceeded. To achieve maximum cable length, this pin should be left open (floating). Status Control Signal. The Cable Length Indication (CLI) signal provides approximate voltage representation of the amount of cable being equalized. Status Signal. The Carrier Detect indicator is used as an output status signal. When the CD output is low, the carrier is present and the data output is active. When the CD output is high, the carrier is not present and the data output is muted (latched to the last state). This indicates that the maximum cable length as set by MCLADJ has been reached. 7 CLI Analog Output 12 CD Digital Output 13 EQO_VEE EQO_VCC SDO, SDO Power Input Negative Supply. Most negative power supply connection for Equalizer output buffer stage. Positive Supply. Most positive power supply connection for Equalizer output buffer stage. Serial Data Output. Differential outputs. 50Ω pull up resistors are included on chip. Ensure that the trace length between the GS1545 and the GS1508 Cable driver is kept to a minimum and that a PCB trace characteristic impedance of 50Ω is maintained between the GS1508 and the GS1545. 50Ω end termination is recommended. 16 Power Input 17, 18 ECL/PECL compatible Output 19 SDO_VEE SDO_EN Power Input Negative Supply. Most negative power supply connection for serial data output stage. Control Signal Input. Used to enable or disable the serial output stage. If a loop through function is not required, then this pin should be tied to the most positive power supply voltage. When SDO_EN is tied to the most negative power supply voltage, the SDO, SDO outputs are enabled. When SDO_EN is tied to the most positive power supply voltage, the SDO, SDO outputs are disabled. 20 Power Input 21 SDO_VCC SP_VCC Power Input Positive Supply. Most positive power supply connection for serial data output stage. Positive Supply. Most positive power supply connection for serial to parallel converter stage. 30, 31 Power Input 7 GENNUM CORPORATION 522 - 28 - 00 PIN DESCRIPTIONS (Continued) NUMBER 32, 33 SYMBOL SP_VEE PCLK_OUT LEVEL Power TYPE Input DESCRIPTION Negative Supply. Most negative power supply connection for the parallel output stage. Output Clock. The device uses PCLK_OUT for clocking the output data stream from DATA_OUT[19:0]. This clock is also used to clock the data into the GS1500 HDTV Deformatter or GS1510 Deformatter. Positive Supply. Most positive supply connection for parallel clock output stage. Negative Supply. Most negative power supply connection for parallel clock output stage. Parallel Data Output Bus. The device outputs a 20 bit parallel data stream running at 74.25 or 74.25/1.001MHz on DATA_OUT[19:0]. DATA_OUT[19] is the MSB and DATA_OUT[0] is the LSB. 34 TTL Output GS1545 35 PCLK_VCC PCLK_VEE DATA_OUT[19:0] Power Input 36 Power Input 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 53, 54, 55, 56, 59, 60, 61, 62, 63, 64 72 73 74 TTL Output LFA_VCC LFA LBCONT Power Analog Analog Input Output Input Positive Supply. Loop filter most positive power supply connection. Control Signal Output. Control voltage for GO1515 VCO. Control Signal Input. Used to provide electronic control of Loop Bandwidth. Negative Supply. Loop filter most negative power supply connection. Most negative power supply connection - enables the jitter demodulator functionality. This pin should be connected to ground. If left floating, the DM function is disabled resulting in a current saving of 340µA. Test Signal. Used for manufacturing test only. These pins must be floating for normal operation. 75 76 LFA_VEE DFT_VEE Power Power Input Input 79, 80 DM, DM Analog Output 81, 85 86 LFS, LFS IJI Analog Analog Input Output Loop Filter Connections. Status Signal Output. Approximates the amount of excessive jitter on the incoming DDI and DDI input. Control Signal Input. Input pin is AC coupled to ground using a 50Ω transmission line. Control Signal Input. Voltage controlled oscillator input. This pin is connected to the output pin of the GO1515 VCO. This pin must be connected to the GO1515 VCO output pin via a 50Ω transmission line. 89 VCO Analog Input 91 VCO Analog Input 93, 96 98 PLCAP, PLCAP PLL_LOCK Analog TTL Input Output Control Signal Input. Phase lock detect time constant capacitor. Status Indicator Signal. This signal is a combination (logical AND) of the carrier detect and phase lock signals. When input is present and PLL is locked, the PLL_LOCK goes high and the outputs are valid. When the PLL_LOCK output is low the data output is muted (latched at the last state). PLL_LOCK is independent of the BYPASS signal. 105 BYPASS TTL Input Control Signal Input. Selectable input that controls whether the input signal is reclocked or passed through the chip. When BYPASS is high; the input signal is reclocked. When BYPASS is low; the input signal is passed through the chip and not reclocked. Muting does not effect bypassed signal. 8 GENNUM CORPORATION 522 - 28 - 00 PIN DESCRIPTIONS (Continued) NUMBER 106 SYMBOL DDI_VTT LEVEL Analog TYPE Input DESCRIPTION Bias Input. Selectable input for interfacing standard ECL outputs requiring 50Ω pull down to VTT power supply for a seamless interface. See Typical Application Circuit for recommended circuit application. 108, 109 DDI, DDI Differential ECL/PECL Input Digital Data Input Signals. Digital input signals from a GS1504 Equalizer or HD crosspoint switch. Because of on chip 50Ω termination resistors, a PCB trace characteristic impedance of 50Ω is recommended. 110 PD_VCC A/D Power Positive Supply. Phase detector most positive power supply connection. Input Control Signal Input. Used to select between the SDI/SDI input or DDI/DDI input. When A/D is HIGH; the SDI/SDI input is selected. When A/D is LOW; the DDI/DDI input is selected. 112 PDSUB_VEE PD_VEE EQI_VCC EQI_VEE SDI, SDI Power Input Substrate Connection. Connect to phase detector’s most negative power supply. Negative Supply. Phase detector most negative power supply connection. Positive Supply. Most positive power supply connection for serial input stage. Negative Supply. Most negative power supply connection for serial input stage. Serial Data Input Signals. AC coupled termination is recommended. Single ended to differential conversion is also feasible. The SDI and SDI input is selected when the A/D signal is high. Ensure that the trace length between the input connector and the GS1545 IC is kept to a minimum and that a PCB trace characteristic impedance of 75Ω is maintained between the connector and the device. GS1545 111 TTL 113 Power Input 117 Power Input 120, 126 Power Input 122, 124 Analog Input 9 GENNUM CORPORATION 522 - 28 - 00 INPUT/OUTPUT CIRCUITS PD_VCC 5k GS1545 PD_VCC 20k 20k PLCAP 10k PLCAP PD_VEE DDI 50 DDI_VTT 50 DDI 100µA PD_VEE Fig. 1 DDI/DDI Input Circuit Fig. 4 PLCAP/PLCAP Output Circuit PD_VCC 5k 5k 500 LFA LFA_VCC 10k 10k 40 40 31p PD_VEE VCO 5mA 100µA LFA_VEE VCO 50 Fig. 2 VCO/VCO Input Circuit Fig. 5 LFA Circuit PD_VCC 10k DM 10k 25k DM LFA_VCC 85µA DFT_VEE LFS 400µA LFA_VEE Fig. 3 DM/DM Output Circuit Fig. 6 LFS Output Circuit 10 GENNUM CORPORATION 522 - 28 - 00 LFA_VCC 10k 5k 16k PD_VCC LFS 100µA 100µA 100µA 100µA LFA_VEE BYPASS + - V = 2.4V GS1545 100µA PD_VEE Fig. 7 LFS Input Circuit Fig. 11 BYPASS Circuit PD_VCC 10k 20k PLL_LOCK LFA_VCC LBCONT 5k PD_VEE LFA_VEE Fig. 8 PLL_LOCK Output Circuit Fig. 12 LBCONT Circuit PD_VCC 10k IJI SP_VCC 5k VCC 30k A PD_VEE 100 D[19:0] 27k SP_VEE Fig. 9 IJI Output Circuit Fig. 13 D[19:0] Output Circuit PD_VCC 16k 20k PCLK_VCC + 2.4V A/D 100 PCLK 100µA PD_VEE 27k PCLK_VEE Fig. 10 A/D Input Circuit Fig. 14 PCLK Output Circuit 11 GENNUM CORPORATION 522 - 28 - 00 SDO_VCC 50 SDO_VCC SDO SDO_EN 20k 50 SDO GS1545 2k SDO_VEE SDO_VEE Fig. 15 SDO_EN Circuit Fig. 18 Serial Output Stage Circuit EQI_VCC 10k 6k SDI RC 7k 7k 6k SDI + 10k EQO_VCC CLI EQI_VEE Fig. 16 Equalizer Input Circuit Fig. 19 CLI Output Circuit EQI_VCC EQO_VCC 40k + MCLADJ OUTPUT STAGE MUTE CONTROL 20k 42µ 10k CD EQI_VEE EQO_VEE Fig. 17 MCLADJ Equivalent Circuit Fig. 20 CD Circuit 12 GENNUM CORPORATION 522 - 28 - 00 DETAILED DESCRIPTION The GS1545 is a single standard equalizing receiver for serial digital HDTV signals at 1.485Gb/s and 1.485/1.001Gb/s. UNIQUE SLEW PHASE LOCK LOOP (S-PLL): A unique feature of the GS1545 is the innovative slew phase lock loop (S-PLL). When a step phase change is applied to the PLL, the output phase gains constant rate of change with respect to time. This behaviour is termed slew. Figure 21 shows an example of input and output phase variation over time for slew and linear (conventional) PLLs. Since the slewing is a nonlinear behavior, the small signal analysis cannot be done in the same way as the standard PLL. However, it is still possible to plot input jitter transfer characteristics at a constant input jitter modulation. Because most of the PLL circuitry is digital, it is more like other digital systems which are generally more robust than their analog counterparts. Additionally, signals like DM/DM which represent the internal functionality can be generated without adding additional artifacts. Thus, system debugging is also possible with these features. The complete slew PLL is made up of several blocks including the phase detector, the charge pump and an external Voltage Controlled Oscillator (VCO). DIGITAL INPUT BUFFER GS1545 The input buffer is a self-biased circuit. On-chip 50Ω termination resistors provide a seamless interface for other HD-LINX™ products such as the GS1504 Adaptive Cable Equalizer. The digital input is selected by applying a logic low to the A/D pin. ANALOG INPUT 0.2 INPUT 0.1 OUTPUT 0.0 SLEW PLL RESPONSE The HD serial data signal may be connected to the input pins (SDI/SDI) in either a differential or single ended configuration. AC coupling of the inputs is recommended, as the SDI and SDI inputs are internally biased at approximately 2.7 volts. The input signal passes through a variable gain equalizing stage whose frequency response closely matches the inverse cable loss characteristic. In addition, the variation of the frequency response with control voltage imitates the variation of the inverse cable loss characteristic with cable length. The analog input is selected by applying a logic high to the A/D pin. The edge energy of the equalized signal is monitored by a detector circuit which produces an error signal corresponding to the difference between the desired edge energy and the actual edge energy. This error signal is integrated by an internal AGC filter capacitor providing a steady control voltage for the gain stage. As the frequency response of the gain stage is automatically varied by the application of negative feedback, the edge energy of the equalized signal is kept at a constant level which is representative of the original edge energy at the transmitter. The equalized signal is also DC restored, effectively restoring the logic threshold of the equalized signal to its correct level independent of shifts due to AC coupling. PHASE DETECTOR PHASE (UI) PHASE (UI) 0.2 INPUT 0.1 OUTPUT 0.0 LINEAR (CONVENTIONAL) PLL RESPONSE Fig. 21 PLL Characteristics Slew PLLs offer several advantages such as excellent noise immunity. Because of the infinite bandwidth for an infinitely small input jitter modulation (or jitter introduced by VCO), the loop corrects for that immediately thus the small signal noise of the VCO is cancelled. The GS1545 uses a very clean, external VCO called the GO1515 (refer to the GO1515 Data Sheet for details). In addition, the bi-level digital phase detector provides constant loop bandwidth that is predominantly independent of the data transition density. The loop bandwidth of a conventional tri-stable charge pump drops with reducing data transitions. During pathological signals, the data transition density reduces from 0.5 to 0.05, but the slew PLL’s performance essentially remains unchanged. The phase detector portion of the slew PLL used in the GS1545 is a bi-level digital phase detector. It indicates whether the data transition occurred before or after with respect to the falling edge of the internal clock. When the phase detector is locked, the data transition edges are aligned to the falling edge of the clock. The input data is then sampled by the rising edge of the clock, as shown in Figure 22. In this manner, the allowed input jitter is 1UI p-p in an ideal situation. However, due to setup and hold time, the GS1545 typically achieves 0.5UI p-p input jitter tolerance without causing any errors in this block. When the 13 GENNUM CORPORATION 522 - 28 - 00 signal is locked to the internal clock, the control output from the phase detector is refreshed at the transition of each rising edge of the data input. During this time, the phase of the clock drifts in one direction. PHASE ALIGNMENT EDGE IN-PHASE CLOCK RE-TIMING EDGE VCO The GO1515 is an external hybrid VCO, which has a centre frequency of 1.485GHz and is also guaranteed to provide 1.485/1.001GHz within the control voltage (3.1V – 4.65V) of the GS1545 over process, power supply and temperature. The GO1515 is a very clean frequency source and, because of the internal high Q resonator, it is an order of magnitude more immune to external noise as compared to on-chip VCOs. The VCO gain, Kƒ, is nominally 16MHz/V. The control voltage around the average LFA voltage will be 500 x ΙP/2. This will produce two frequencies off from the centre by ƒ=Kƒ x 500 x ΙP/2. LBCONT GS1545 0.5UI INPUT DATA WITH JITTER OUTPUT DATA Fig. 22 Phase Detector Characteristics During pathological signals, the amount of jitter that the phase detector will add can be calculated. By choosing the proper loop bandwidth, the amount of phase detector induced jitter can also be limited. Typically, for a 1.41MHz loop bandwidth at 0.2UI input jitter modulation, the phase detector induced jitter is about 0.015UIp-p. This is not very significant, even for the pathological signals. CHARGE PUMP The LBCONT pin is used to adjust the loop bandwidth by externally changing the internal charge pump current. For maximum loop bandwidth, connect LBCONT to the most positive power supply. For medium loop bandwidth, connect LBCONT through a pull-up resistor (RPULL-UP). For low loop bandwidth, leave LBCONT floating. The formula below shows the loop bandwidth for various configurations. ( 25k Ω + R PULL – UP ) LBW = LBW NOMINAL × ----------------------------------------------------( 5k Ω + R PULL – UP ) where LBW nominal is the loop bandwidth when LBCONT is left floating. LOOP BANDWIDTH OPTIMIZATION The charge pump in a slew PLL is different from the charge pump in a linear PLL. There are two main functions of the charge pump. One function is to hold the frequency information of the input data. This information is held by CCP1, which is connected between LFS and LFS. The other capacitor, CCP2 between LFS and LFA_GND is used to remove common mode noise. Both CCP1 and CCP2 should be the same value. The second function of the charge pump is to provide a binary control voltage to the VCO depending upon the phase detector output. The output pin, LFA controls the VCO. Internally there is a 500Ω pull-up resistor, which is driven with a 100µA current called ΙP. Another analog current ΙF, with 5mA maximum drive proportional to the voltage across the CCP1, is applied at the same node. The voltage at the LFA node is VLFA_VCC - 500(ΙP+ΙF) at any time. Because of the integrator, ΙF changes very slowly whereas ΙP could change at the positive edge of the data transition as often as a clock period. In the locked position, the average voltage at the LFA (VLFA_VCC – 500(ΙP/2+ΙF) is such that VCO generates frequency ƒ, equal to the data rate clock frequency. Since ΙP is changing all the time between 0A and 100µA, there will be two levels generated at the LFA output. Since the feed back loop has only digital circuits, the small signal analysis does not apply to the system. The effective loop bandwidth scales with the amount of input jitter modulation index. PHASE LOCK The phase lock circuit is used to determine the phase locked condition. It is done by generating a quadrature clock by delaying the in-phase clock (the clock whose falling edge is aligned to the data transition) by 166ps (0.25UI at 1.5GHz) with the tolerance of 0.05UI. When the PLL is locked, the falling edge of the in-phase clock is aligned with the data edges as shown in Figure 23. The quadrature clock is in a logic high state in the vicinity of input data transitions. The quadrature clock is sampled and latched by positive edges of the data transitions. The generated signal is low pass filtered with an RC network. The R is an on-chip 20kΩ resistor and CPL is an external capacitor (recommended value 10nF). The time constant is about 67µs, or more than a video line. 14 GENNUM CORPORATION 522 - 28 - 00 PHASE ALIGNMENT EDGE IN-PHASE CLOCK RE-TIMING EDGE P-P SINE WAVE JITTER IN UI 0.00 0.15 IJI VOLTAGE 4.75 4.75 4.75 4.70 0.5UI INPUT DATA WITH JITTER 0.25UI QUADERATURE CLOCK 0.30 0.39 0.45 0.48 0.52 0.55 0.58 GS1545 4.60 4.50 4.40 4.30 4.20 4.10 3.95 PLCAP SIGNAL 0.60 0.63 PLCAP SIGNAL Fig. 23 PLL Circuit Principles 5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6 If the signal is not locked, the data transition phase could be anywhere with respect to the internal clock or the quadrature clock. In this case, the normalized filtered sample of the quadrature clock will be 0.5. When VCO is locked to the incoming data, data will only sample the quadrature clock when it is logic high. The normalized filtered sample quadrature clock will be 1.0. We chose a threshold of 0.66 to generate the phase lock signal. Because the threshold is lower than 1, it allows jitter to be greater than 0.5UI before the phase lock circuit reads it as “not phase locked”. INPUT JITTER INDICATOR (IJI) IJI SIGNAL (V) 0.00 0.20 0.40 0.60 0.80 INPUT JITTER (UI) Fig. 24 Input Jitter Indicator (Typical at TA = 25°C) JITTER DEMODULATION (DM) This signal indicates the amount of excessive jitter (beyond the quadrature clock window 0.5UI), which occurs beyond the quadrature clock window (see Figure 23). All the input data transitions occurring outside the quadrature clock window, will be captured and filtered by the low pass filter as mentioned in the Phase Lock section. The running time average of the ratio of the transitions inside the quadrature clock and outside the quadrature is available at the PLCAP/PLCAP pins. A signal, IJI, which is the buffered signal available at the PLCAP is provided so that loading does not effect the filter circuit. The signal at IJI is referenced with the power supply such that the factor VIJI /V CC is a constant over process and power supply for a given input jitter modulation. The IJI signal has 10kΩ output impedance. Figure 24 shows the relationship of the IJI signal with respect to the sine wave modulated input jitter. The differential jitter demodulation (DM) signal is available at the DM and DM pins. This signal is the phase correction signal of the PLL loop, which is amplified and buffered. If the input jitter is modulated, the PLL tracks the jitter if it is within loop bandwidth. To track the input jitter, the VCO has to be adjusted by the phase detector via the charge pump. Thus, the signal which controls the VCO contains the information of the input jitter modulation. The jitter demodulation signal is only valid if the input jitter is less than 0.5UIp-p. The DM/DM signals have 10kΩ output impedance, which could be low pass filtered with appropriate capacitors to eliminate high frequency noise. DFT_VEE should be connected to GND to activate DM/DM signals. The DM signals can be used as diagnostic tools. Assume there is an HDTV SDI source, which contains excessive noise during the horizontal blanking because of the transient current flowing in the power supply. In order to discover the source of the noise, one could probe around 15 GENNUM CORPORATION 522 - 28 - 00 the source board with a low frequency oscilloscope (Bandwidth < 20MHz) that is triggered with an appropriately filtered DM/DM signal. The true cause of the modulation will be synchronous and will appear as a stationary signal with respect to the DM/DM signal. Figure 25 shows an example of such a situation. An HDTV SDI signal is modulated with a modulation signal causing about 0.2UI jitter in Figure 25 (Channel 1). The GS1545 receives this signal and locks to it. Figure 25 (Channel 2) shows the DM signal. Notice the wave shape of the DM signal, which is synchronous to the modulating signal. The DM/DM signal could also be used to compare the output jitter of the HDTV signal source. SERIAL OUTPUT STAGE The serial output signals have a nominal voltage of 400mVpp differential, or 200mVpp single ended when terminated with 50Ω. SDO_EN The SDO_EN enables or disables the serial output driver. To disable the driver, tie SDO_EN to VCC. To enable the driver, tie SDO_EN to VEE. When disabled, the supply current is reduced by approximately 10mA. A/D GS1545 A/D is a TTL compatible input pin used to select between the analog or digital input. When A/D is at logic high, the analog input is selected. When A/D is low, the digital input is enabled. CLI The voltage output of CLI pin is proportional to the amount of cable present at the GS1545 analog input. With 0m of cable (800mV input signal levels), the CLI output voltage is approximately 3.3V. As the cable length increases, the CLI voltage decreases providing correlation between the CLI voltage and cable length. CLI voltage will be a function of the launch voltage and cable type/quality. MCLADJ Fig. 25 Jitter Demodulation Signal LOCK LOGIC Logic is used to produce the PLL_LOCK signal which is based on the LFS signal and phase lock signal. When there is not any data input, the integrator will charge and eventually saturate at either end. By sensing the saturation of the integrator, it is determined that no data is present. If either data is not present or phase lock is low, the lock signal is made low. Logic signals are used to acquire the frequency by sweeping the integrator. Injecting a current into the summing node of the integrator achieves the sweep. The sweep is disabled once phase lock is asserted. The direction of the sweep is also changed once LFS saturates at either end. BYPASS The outputs of the GS1545 can be muted when the input signal decreases below a preselected input level. The MCLADJ pin may be left unconnected for applications where output muting is not required. The use of a Carrier Detect function with a fixed internal reference does not solve this problem since the signal to noise ratio on the circuit board could be significantly less than the default signal detection level set by the on chip reference. CARRIER DETECT The CD pin is a TTL compatible output signal. When a carrier is detected at the analog input, the CD pin is pulled low. When a carrier is not detected, the CD will be pulled high. SERIAL TO PARALLEL CONVERTER The BYPASS block bypasses the reclocked/mute path of the data whenever a logic low input is applied to the BYPASS input. In the bypass mode, the mute does not have any effect on the outputs. Also, the internal PLL still locks to a valid HDTV signal and shows PLL_LOCK. The high-speed serial to parallel converter accepts differential clock and data signals from the reclocker core. The S/P core converts this serial output into a 20-bit wide data stream (D[19:0]). It also provides a parallel clock, which is 1/20th the serial clock rate (PCLK_OUT). The outputs of the S/P block are TTL compatible. When the PLL loses lock, the parallel clock continues to freewheel. The parallel clock and data outputs were designed for seamless interfaces to the GS1500 and GS1510. 16 GENNUM CORPORATION 522 - 28 - 00 nc 102 nc 101 nc 100 nc 99 98 PLL_LOCK nc 97 PLCAP 96 LFA_VCC 72 nc 71 nc 70 nc 95 nc 94 93 PLCAP 92 nc 91 VCO nc 90 VCO 89 nc 88 nc 87 IJI 86 LFS 85 84 nc nc 83 nc 82 81 DM 80 79 DM nc 78 nc 77 DFT_VEE 76 75 LFA_V LBCONT 74 LFA 73 nc 69 nc 68 nc 67 nc 66 C25 J5 10n BYPASS 103 nc 104 nc 105 BYPASS 106 DDI_V TT 107 nc 108 DDI 109 DDI 110 PD_V CC 111 A/D 112 PDSUB_VEE 113 PD_V EE 114 nc 115 nc LFS nc 65 EE J6 4µ7 A/D VCC VCC SECOND PAIR OF BNC SHOWN IS FOR DUAL FOOTPRINT OPTION ON INPUT CONNECTORS J1 L5 10nH 116 nc ANALOG POWER PLANE 117 EQI_V CC 100n VCC VCC 17 SDO 18 SDO 19 SDO_V EE 20 SDO_EN 21 SDO_VCC 22 nc 23 nc 24 nc 25 nc 12 CD 13 EQO_V 14 nc 15 nc 16 EQO_V CLI 8 nc 9 nc 10 nc 11 nc 33 SP_V EE 34 PCLK_OUT 35 PCLK_V CC 36 PCLK_V CC EE 31 SP_V CC 32 SP_V 5 MCLAD 6 nc CC 29 nc 30 SP_V 1 nc 2 nc 3 nc 4 nc 26 nc 27 nc 28 nc EE C19 CLI C22 10n VCC R17 2k VCC SDO_EN VCC VCC C24 + 4µ7 J7 VCC PCLK 10n All resistors in ohms, all capacitors in farads, unless otherwise shown. R8 15k CD R6 10k + C23 J4 4µ7 37 nc 38 nc 7 EE GS1545 GENNUM CORPORATION C32 C33 4µ7 VCC 5k C28 + C26 10n 1µ C34 + 1µ LFA VCC V C35 CC 10n VCO C29 10n C30 10n C31 10n C65 10n C27 PLL_LOCK 10n (110/112) (19/21) (30-31/32-33) (35/36) D19 64 D18 63 D17 D16 D15 62 61 60 D19 D18 D17 D16 D15 D14 VCC VCO POWER PLANE L17 C64 10µ C61 100n L16 C60 10µ C59 59 D14 nc 58 nc 57 56 D13 D12 55 D11 54 D10 53 nc 52 nc 51 D9 50 49 D8 48 D7 47 D6 46 D5 45 D4 D3 44 D2 D1 43 42 TYPICAL APPLICATION CIRCUIT D13 D12 D11 D10 GS1545 MAIN POWER PLANE NOTE: L8 to L11, L16 and L17 are 0Ω RESISTORS. USE 12nH INDUCTORS IN NOISY ENVIRONMENTS. 17 522 - 28 - 00 C52 100n C49 10µ VCC D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 BNC_ANCHOR 1p5 R12 75 R15 75 R13 J3 118 nc 10n 119 nc 120 EQI_V EE 121 nc C18 122 SDI 123 nc 47p C20 124 SDI 125 nc 47p 126 37.5 EQI_VEE 127 nc 128 nc C17 VCC C54 100n C55 10µ L10 C53 10µ L11 VCC C56 100n L8 C51 10µ C50 DIGITAL POWER PLANE 100n L9 41 D0 nc 40 nc 39 TYPICAL APPLICATION CIRCUIT (continued) GO1515 VCO LFA POWER CONNECT C43 VCC 100n C42 + 10µ VCC 3 VCC + C41 10µ C44 GS1545 2 4 VCTR 1 100n GND U2 GND GO1515 GND 8 GS1545 LOCK DETECT VCC R27 R26 Q3 LED3 150 6 GND 5 O/P 7 nc VCO PLL_LOCK 22k GS1545 CONFIGURATION JUMPERS VCC VCC VCC GS1545 CD VCC Q1 BYPASS A/D SDO_EN CD R25 20k R28 LED4 150 All resistors in ohms, all capacitors in farads, unless otherwise shown. APPLICATION INFORMATION Please refer to the EBHDRX evaluation board documentation for more detailed application and circuit information on using the GS1545 with the GS1500 and GS1510 Deformatters. 18 GENNUM CORPORATION 522 - 28 - 00 PACKAGE DIMENSIONS 23.20 ±0.25 20.0 ±0.10 18.50 REF GS1545 12 TYP 12.50 REF 17.20 ±0.25 0.75 MIN 0 -7 0.30 MAX RADIUS 14.0 ±0.10 0-7 0.13 MIN. RADIUS 1.6 REF 3.00 MAX 128 pin MQFP All dimensions are in millimetres. 0.88 ±0.15 0.50 BSC 0.27 ±0.08 2.80 ±0.25 CAUTION ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION DOCUMENT IDENTIFICATION PRELIMINARY DATA SHEET The product is in a preproduction phase and specifications are subject to change without notice. REVISION NOTES: Upgraded to Preliminary Data Sheet; Updated Functional Block Diagram and Typical Application Circuit; Updated Absolute Maximum Ratings, AC and DC Electrical Characteristics Tables; Updated Pin Connections and Description. For latest product information, visit www.gennum.com GENNUM JAPAN CORPORATION C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku Tokyo 168-0081, Japan Tel. +81 (03) 3334-7700 Fax. +81 (03) 3247-8839 GENNUM UK LIMITED 25 Long Garden Walk, Farnham, Surrey, England GU9 7HX Tel. +44 (0)1252 747 000 Fax +44 (0)1252 726 523 GENNUM CORPORATION MAILING ADDRESS: P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946 SHIPPING ADDRESS: 970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5 Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. © Copyright May 2000 Gennum Corporation. All rights reserved. Printed in Canada. 19 522 - 28 - 00