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CS61581-IL Datasheet(PDF) 26 Page - Cirrus Logic |
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CS61581-IL Datasheet(HTML) 26 Page - Cirrus Logic |
26 / 37 page CS61581 26 DS211PP8 4.2 Power Supply The device operates from a single +5 Volt supply. Separate pins for transmit and receive supplies pro- vide internal isolation. These pins should decou- pled to their respective grounds. TV+ must not exceed RV+ by more than 0.3 V. Decoupling and filtering of the power supplies is crucial for the proper operation of the analog cir- cuits in both the transmit and receive paths. A 47 ∝F tantalum and 1.0 ∝F mylar or ceramic capacitor should be connected between TV+ and TGND, and a 0.1 ∝F mylar or ceramic capacitor should be con- nected between RV+ and RGND. Place capacitors as closely as possible to their respective power sup- ply pins. Wire-wrap breadboarding of the line in- terface is not recommended because lead resistance and inductance serve to defeat the function of the decoupling capacitors. Turns ratio: Low Impedance Output/Hardware Mode 1:2 step-up transmit, 1:1 receive Turns ratio: Matched Impedance Output 1:1.5 step-up transmit, 1:1 receive Primary inductance 1.2 mH min at 772 kHz Primary leakage inductance 0.5 ∝H max at 772 kHz with secondary shorted Secondary leakage inductance 0.5 ∝H max at 772 kHz Interwinding capacitance 40 pF max, primary to secondary ET-constant 16 V- ∝s min Table 6. Transformer Specification Diagnostic Mode Availability (Note 25) H/W Host Host Mode (Note 26) Maskable Loopback Modes Local Loopback (LLOOP) Yes Yes No Remote Loopback (RLOOP) Yes Yes No In-band Network Loopback (NLOOP) Yes Yes Yes Internal Data Pattern Generation and Detection Transmit All Ones (TAOS) Yes Yes No Quasi-Random Signal Source (QRSS) No Yes No In-band Loop-up/down Code Generator No Yes No Error Insertion and Detection Quasi-Random Signal Detection (QDET) No Yes No Quasi-Random Signal Error Insertion (INS_QERR) No Yes No Bipolar Violation Detection (BPV) Yes Yes No Alarm Condition Monitoring Receive Loss of Signal Monitoring (LOS) Yes Yes Yes Receive Alarm Indication Signal Monitoring (AIS) No Yes Yes Other Diagnostic Reports Receive Line Attenuation Indicator (LATN) Yes Yes No Notes: 25. In Hardware Mode the Diagnostic Modes are selected by directly setting the pins on the device; in Host Mode, the appropriate register bits are written for Diagnostic Modes. 26. In Host Mode the interrupts can be masked by writing a “1” to the LOS bit; there is no masking in the Hardware Mode. Table 5. Diagnostic Mode Availability CS61581 26 DS211F1 |
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