Rainbow-electronics DS1875 Instrukcja Użytkownika

General DescriptionThe DS1875 controls and monitors all functions for burst-mode transmitters, APD receivers, and video receivers.It also includes a p

DS1875PON Triplexer and SFP Controller10 ______________________________________________________________________________________SUPPLY CURRENTvs. SUPPL

DS1875Typical Operating Characteristics (continued)(VCC= +2.85V to +3.9V, TA= +25°C, unless otherwise noted.)CALCULATED AND DESIRED % CHANGEIN VMOD vs

DS1875PON Triplexer and SFP Controller12 ______________________________________________________________________________________PWM DAC DNLDS1875 toc19

DS1875PON Triplexer and SFP Controller______________________________________________________________________________________ 13Pin DescriptionPIN NAME

DS1875PON Triplexer and SFP Controller14 ______________________________________________________________________________________Block DiagramHBIASQUICK

DS1875Typical Operating CircuitBEN+BEN-DISIN-IN+OUT-BIAS-BIAS+OUT+VCCTX-FTX-DSCLSDALOSID3D0MON[5:7]MON2MON3MON4FETGM4DACD1MON1BMD3.3VVMSETMODSETVREFIM

DS1875PON Triplexer and SFP Controller16 ______________________________________________________________________________________Detailed DescriptionThe

DS1875DC OperationWhen using autodetect mode or closed-loop mode,BEN should be equal to VCCor long burst. In open-loopmode, BEN should be ground or an

DS1875PON Triplexer and SFP Controller18 ______________________________________________________________________________________BIAS and MOD Output as

DS1875quick-trip alarm that is detected by default remainsactive until a subsequent comparator sample shows thecondition no longer exists. A second bi

DS18752 _______________________________________________________________________________________Absolute Maximum Ratings . . . . . . . . . . . . . . .

DS1875PON Triplexer and SFP Controller20 ______________________________________________________________________________________The ADC results (after

DS1875Right-Shifting ADC ResultIf the weighting of the ADC digital reading must con-form to a predetermined full-scale value defined by astandard’s sp

DS1875PON Triplexer and SFP Controller22 ______________________________________________________________________________________Safety Shutdown (FETG)

DS1875Die IdentificationThe DS1875 has an ID hard-coded to its die. Two regis-ters (Table 02h, Registers 86h–87h) are assigned forthis feature. Byte 8

DS187524 ______________________________________________________________________________________Dual-range functionality consists of two modes of opera

DS1875two thresholds. The actual threshold values are a func-tion of the number of right-shifts being used. Table 7shows the threshold values for each

DS1875PON Triplexer and SFP Controller26 ______________________________________________________________________________________than the PWM DAC level,

DS1875Stability and Compensation Component SelectionThe components connected to the COMP pin (RCOMPand CCOMP) introduce a pole and zero that are neces

DS1875PON Triplexer and SFP Controller28 ______________________________________________________________________________________SWCURRENT SINKFBCOMPDS1

DS1875SCLNOTE: TIMING IS REFERENCED TO VIL(MAX) AND VIH(MIN).SDASTOP START REPEATEDSTARTtBUFtHD:STAtHD:DATtSU:DATtSU:STOtHD:STAtSPtSU:STAtHIGHtRtFtLOW

DS1875_______________________________________________________________________________________ 3Die Identification . . . . . . . . . . . . . . . . . .

DS1875PON Triplexer and SFP Controller30 ______________________________________________________________________________________Byte Write: A byte writ

DS1875were not modified during the transaction are stillsubject to a write cycle. This can result in a wholepage being worn out over time by writing a

DS1875PON Triplexer and SFP Controller32 ______________________________________________________________________________________Shadowed EEPROMMany NV

DS1875This register map shows each byte/word (2 bytes) in terms of the row it is on in the memory. The first byte in the row islocated in memory at th

DS1875PON Triplexer and SFP Controller34 ______________________________________________________________________________________TABLE 00h WORD 0 WORD

DS1875TABLE 01h (PW1) WORD 0 WORD 1 WORD 2 WORD 3 ROW (HEX) ROW NAME BYTE 0/8 BYTE 1/9 BYTE 2/A BYTE 3/B BYTE 4/C BYTE 5/D BYTE 6/E BYTE 7/F

DS1875PON Triplexer and SFP Controller36 ______________________________________________________________________________________TABLE 02h (PW2) WORD 0

DS1875TABLE 03h (PW2) WORD 0 WORD 1 WORD 2 WORD 3 ROW (HEX) ROW NAME BYTE 0/8 BYTE 1/9 BYTE 2/A BYTE 3/B BYTE 4/C BYTE 5/D BYTE 6/E BYTE 7/F

DS1875PON Triplexer and SFP Controller38 ______________________________________________________________________________________TABLE 04h (MODULATION L

DS1875TABLE 06h (M4DAC LUT) WORD 0 WORD 1 WORD 2 WORD 3 ROW (HEX) ROW NAME BYTE 0/8 BYTE 1/9 BYTE 2/A BYTE 3/B BYTE 4/C BYTE 5/D BYTE 6/E BY

DS1875PON Triplexer and SFP Controller4 _______________________________________________________________________________________Auxiliary Memory A0h Re

DS1875PON Triplexer and SFP Controller40 ______________________________________________________________________________________TABLE 08h (BIAS OPEN-LO

DS1875AUXILIARY MEMORY (A0h) WORD 0 WORD 1 WORD 2 WORD 3 ROW (HEX) ROW NAME BYTE 0/8 BYTE 1/9 BYTE 2/A BYTE 3/B BYTE 4/C BYTE 5/D BYTE 6/E B

DS1875PON Triplexer and SFP Controller42 ______________________________________________________________________________________Lower Memory, Register

DS1875Lower Memory, Register 08h to 09h: VCCALARM HILower Memory, Register 0Ch to 0Dh: VCCWARN HILower Memory, Register 10h to 11h: MON1 ALARM HILower

DS1875PON Triplexer and SFP Controller44 ______________________________________________________________________________________ FACTORY DEFAULT 000

DS1875Lower Memory, Register 30h to 5Fh: PW2 EE FACTORY DEFAULT 00h READ ACCESS All WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (EE)

DS1875PON Triplexer and SFP Controller46 ______________________________________________________________________________________ POWER-ON VALUE 0000h

DS1875Lower Memory, Register 6Eh: STATUS POWER-ON VALUE X000 0XXXb READ ACCESS All WRITE ACCESS See below MEMORY TYPE Volatile

DS1875PON Triplexer and SFP Controller48 ______________________________________________________________________________________ POWER-ON VALUE 00h

DS1875 POWER-ON VALUE 10h READ ACCESS All WRITE ACCESS N/A MEMORY TYPE Volatile 70h TEMP HI TEMP LO VCC HI VCC LO MON1 HI

DS1875Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and funct

DS1875PON Triplexer and SFP Controller50 ______________________________________________________________________________________ POWER-ON VALUE 00h

DS1875Lower Memory, Register 72h: ALARM1 POWER-ON VALUE 00h READ ACCESS All WRITE ACCESS N/A MEMORY TYPE Volatile

DS1875PON Triplexer and SFP Controller52 ______________________________________________________________________________________Lower Memory, Register

DS1875Lower Memory, Register 75h: WARN2 POWER-ON VALUE 00h READ ACCESS All WRITE ACCESS N/A MEMORY TYPE Volatile 75h MON3 HI

DS1875PON Triplexer and SFP Controller54 ______________________________________________________________________________________Lower Memory, Register

DS1875Lower Memory, Register 79h: DIN POWER-ON VALUE See description READ ACCESS All WRITE ACCESS N/A MEMORY TYPE Volatile 7

DS1875PON Triplexer and SFP Controller56 ______________________________________________________________________________________Lower Memory, Register

DS1875Table 00h Register DescriptionsTable 00h, Register 80h to 81h: MON5 VALUETable 00h, Register 82h to 83h: MON6 VALUETable 00h, Register 84h to 85

DS1875PON Triplexer and SFP Controller58 ______________________________________________________________________________________Table 01h, Register F8h

DS1875Table 01h, Register FAh: ALARM1 POWER-ON VALUE 00h READ ACCESS All WRITE ACCESS PW1 MEMORY TYPE Volatile FAh RESER

DS1875PON Triplexer and SFP Controller6 _______________________________________________________________________________________PARAMETER SYMBOL CONDIT

DS1875PON Triplexer and SFP Controller60 ______________________________________________________________________________________Table 01h, Register FDh

DS1875Table 02h Register DescriptionsTable 02h, Register 80h: MODEPON Triplexer and SFP Controller____________________________________________________

DS1875PON Triplexer and SFP Controller62 ______________________________________________________________________________________Table 02h, Register 81h

DS1875Table 02h, Register 83h: APC DAC FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2 and APC EN = 0 MEMORY TYPE Volati

DS1875PON Triplexer and SFP Controller64 ______________________________________________________________________________________Table 02h, Register 85h

DS1875Table 02h, Register 88h: SAMPLE RATE FACTORY DEFAULT 30h READ ACCESS PW2 WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (SEE)

DS1875PON Triplexer and SFP Controller66 ______________________________________________________________________________________Table 02h, Register 89h

DS1875Table 02h, Register 8Ah: RESERVEDFACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (SEE) This re

DS1875PON Triplexer and SFP Controller68 ______________________________________________________________________________________Table 02h, Register 8Ch

DS1875Table 02h, Register 8Dh: COMP RANGING FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (SEE)

DS1875PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM-DAC Full-Scale Voltage VPWM-DAC 1.25 V PWM-DAC Resolution 8 Bits VPWM-DAC

DS1875PON Triplexer and SFP Controller70 ______________________________________________________________________________________Table 02h, Register 8Eh

DS1875Table 02h, Register 92h to 93h: VCCSCALETable 02h, Register 94h to 95h: MON1 SCALETable 02h, Register 96h to 97h: MON2 SCALETable 02h, Register

DS1875PON Triplexer and SFP Controller72 ______________________________________________________________________________________Table 02h, Register A2h

DS1875Table 02h, Register B0h to B3h: PW1 FACTORY DEFAULT FFFF FFFFh READ ACCESS N/A WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (

DS1875PON Triplexer and SFP Controller74 ______________________________________________________________________________________Table 02h, Register B8h

DS1875Table 02h, Register B9h: FETG ENABLE0 FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (SEE) B

DS1875PON Triplexer and SFP Controller76 ______________________________________________________________________________________Table 02h, Register BAh

DS1875Table 02h, Register BBh: TX-F ENABLE0 FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (SEE)

DS1875PON Triplexer and SFP Controller78 ______________________________________________________________________________________Table 02h, Register BCh

DS1875Table 02h, Register BEh: HBIAS FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (SEE)

DS1875PON Triplexer and SFP Controller8 _______________________________________________________________________________________PARAMETER SYMBOL CONDIT

DS1875PON Triplexer and SFP Controller80 ______________________________________________________________________________________Table 02h, Register C0h

DS1875Table 02h, Register C1h to C2h: RESERVED FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2 MEMORY TYPE Nonvolatile (S

DS1875PON Triplexer and SFP Controller82 ______________________________________________________________________________________Table 02h, Register C5h

DS1875Table 02h, Register C8h to C9h: MON5 SCALETable 02h, Register CAh to CBh: MON6 SCALETable 02h, Register CCh to CDh: MON7 SCALETable 02h, Registe

DS1875PON Triplexer and SFP Controller84 ______________________________________________________________________________________Table 02h, Register D8h

DS1875Table 02h, Register FBh to FCh: BIAS DAC FACTORY DEFAULT 8000h READ ACCESS PW2 WRITE ACCESS N/A MEMORY TYPE Volatile FBh

DS1875PON Triplexer and SFP Controller86 ______________________________________________________________________________________Table 02h, Register FEh

DS1875Table 03h Register DescriptionsTable 03h, Register 80h to FFh: PW2 EEPROM FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2

DS1875PON Triplexer and SFP Controller88 ______________________________________________________________________________________Table 05h Register Desc

DS1875Table 06h Register DescriptionsTable 06h, Register 80h to 9Fh: M4DAC LUT FACTORY DEFAULT 00h READ ACCESS PW2 WRITE ACCESS PW2

DS1875Note 1: All voltages are referenced to ground. Current into IC is positive, and current out of the IC is negative.Note 2: Digital inputs are at

DS1875PON Triplexer and SFP Controller90 ______________________________________________________________________________________Table 07h Register Desc

DS1875PON Triplexer and SFP Controller______________________________________________________________________________________ 91 FACTORY DEFAULT 00h

DS1875PON Triplexer and SFP ControllerMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim pr