PDF HC5515 Data sheet ( Hoja de datos )

Número de pieza	HC5515
Descripción	ITU CO/PABX SLIC with Low Power Standby
Fabricantes	Intersil Corporation
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No Preview Available ! Data Sheet HC5515 October 1998 File Number 4235.4 ITU CO/PABX SLIC with Low Power Standby The HC5515 is a subscriber line interface circuit which is interchangeable with Ericsson’s PBL3860 for distributed central ofﬁce applications. Enhancements include immunity to circuit latch-up during hot plug and absence of false signaling in the presence of longitudinal currents. The HC5515 is fabricated in a High Voltage Dielectrically Isolated (DI) Bipolar Process that eliminates leakage currents and device latch-up problems normally associated with junction isolated ICs. The elimination of the leakage currents results in improved circuit performance for wide temperature extremes. The latch free beneﬁt of the DI process guarantees operation under adverse transient conditions. This process feature makes the HC5515 ideally suited for use in harsh outdoor environments. Ordering Information PART NUMBER HC5515CM HC5515CP HC5515IM HC5515IP TEMP. RANGE (oC) PACKAGE 0 to 70 28 Ld PLCC 0 to 70 22 Ld PDIP -40 to 85 28 Ld PLCC -40 to 85 22 Ld PDIP PKG. NO. N28.45 E22.4 N28.45 E22.4 Features • DI Monolithic High Voltage Process • Programmable Current Feed (20mA to 60mA) • Programmable Loop Current Detector Threshold and Battery Feed Characteristics • Ring Trip Detection • Compatible with Ericsson’s PBL3860 • Thermal Shutdown • On-Hook Transmission • Wide Battery Voltage Range (-24V to -58V) • Low Standby Power • -40oC to 85oC Ambient Temperature Range Applications • Digital Loop Carrier Systems • Fiber-In-The-Loop ONUs • Wireless Local Loop • Hybrid Fiber Coax • Pair Gain • POTS • PABX • Related Literature - AN9632, Operation of the HC5523/15 Evaluation Board Block Diagram RINGRLY DT DR TIP RING HPT HPR RING RELAY DRIVER RING TRIP DETECTOR 2-WIRE INTERFACE VBAT VCC VEE AGND BGND BIAS LOOP CURRENT DETECTOR 4-WIRE INTERFACE VF SIGNAL PATH DIGITAL MULTIPLEXER VTX RSN E0 C1 C2 DET RD RDC RSG 55 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 \| Copyright © Intersil Corporation 1999 1 page HC5515 Electrical Specifications PARAMETER 4-Wire to 2-Wire TA = -40oC to 85oC, VCC = +5V ±5%, VEE = -5V ±5%, VBAT = -48V, AGND = BGND = 0V, RDC1 = RDC2 = 41.2kΩ, RD = 39kΩ, RSG = 0Ω, RF1 = RF2 = 0Ω, CHP = 10nF, CDC = 1.5µF, ZL = 600Ω, Unless Otherwise Specified. All pin number references in the figures refer to the 28 lead PLCC package. (Continued) CONDITIONS MIN TYP MAX UNITS -55dBm to -40dBm (Note 22, Figure 9) -0.2 - 0.2 dB GRX = ((VTR1- VTR2)(300k))/(-3)(600) Where: VTR1 is the Tip to Ring Voltage with VRSN = 0V and VTR2 is the Tip to Ring Voltage with VRSN = -3V VRSN = 0V TIP RSN 27 16 RRX 300kΩ VRSN = -3V RL 600Ω VTR RDC1 41.2kΩ RING RDC 28 14 RDC2 41.2kΩ CDC 1.5µF RL 600Ω EG 1/ωC < RL C IDCMET TIP VTX 27 19 VTR RING RSN 28 16 RT 600kΩ VTX RRX ERX 300kΩ FIGURE 8. CURRENT GAIN-RSN TO METALLIC FIGURE 9. FREQUENCY RESPONSE, INSERTION LOSS, GAIN TRACKING AND HARMONIC DISTORTION NOISE Idle Channel Noise at 2-Wire C-Message Weighting (Note 23, Figure 10) - 8.5 - dBrnC Psophometrical Weighting (Note 23, Figure 10) - -81.5 - dBrnp Idle Channel Noise at 4-Wire C-Message Weighting (Note 24, Figure 10) - 8.5 - dBrnC Psophometrical Weighting (Note 23, Figure 10) - -81.5 - dBrnp HARMONIC DISTORTION 2-Wire to 4-Wire 0dBm, 1kHz (Note 25, Figure 7) - -65 -54 dB 4-Wire to 2-Wire 0dBm, 0.3kHz to 3.4kHz (Note 26, Figure 9) - -65 -54 dB BATTERY FEED CHARACTERISTICS Constant Loop Current Tolerance RDCX = 41.2kΩ Loop Current Tolerance (Standby) Open Circuit Voltage (VTIP - VRING) LOOP CURRENT DETECTOR On-Hook to Off-Hook Off-Hook to On-Hook Loop Current Hysteresis I-L40=o2C5t0o08/(5RoDCC(1N+otReD2C72)), -IL40=o(CVBtoAT8-53o)C/(R(NLo+t1e82080)), -40oC to 85oC, (Active) RSG = ∞ RD = 33kΩ, -40oC to 85oC RD = 33kΩ, -40oC to 85oC RD = 33kΩ, -40oC to 85oC 0.85IL 0.75IL 14 IL IL 16.67 1.15IL 1.25IL 20 11 465/RD 17.2 9.5 405/RD 15.0 - 60/RD - mA mA V mA mA mA TIP VTX 27 19 RL 600Ω VTR RING RSN 28 16 RT 600kΩ VTX RRX 300kΩ FIGURE 10. IDLE CHANNEL NOISE 59 5 Page HC5515 Cases 2 and 3 illustrate the longitudinal loop current. The deﬁnition of a longitudinal loop current is a common mode current, that ﬂows either out of or into tip and ring simultaneously. Longitudinal currents in the on-hook state result in equal currents ﬂowing through the sense resistors R1 and R2 (Figure 17). And longitudinal currents in the off- hook state result in unequal currents ﬂowing through the sense resistors R1 and R2. Notice that for case 2, longitudinal currents ﬂowing away from the SLIC, the current through R1 is the metallic loop current plus the longitudinal current; whereas the current through R2 is the metallic loop current minus the longitudinal current. Longitudinal currents are generated when the phone line is inﬂuenced by magnetic ﬁelds (e.g. power lines). Loop Current Detector Figure 17 shows a simpliﬁed schematic of the loop current detector. The loop current detector works by sensing the metallic current ﬂowing through resistors R1 and R2. This results in a current (IRD) out of the transconductance ampliﬁer (gm1) that is equal to the product of gm1 and the metallic loop current. IRD then ﬂows out the RD pin and through resistor RD to VEE. The value of IRD is equal to: IRD = --I--T----I-P-----6–---0--I-0-R----I--N----G---- = 3---I-0-L--0-- (EQ. 24) The IRD current results in a voltage drop across RD that is compared to an internal 1.25V reference voltage. When the voltage drop across RD exceeds 1.25V, and the logic is conﬁgured for loop current detection, the DET pin goes low. The hysteresis resistor RH adds an additional voltage effectively across RD, causing the on-hook to off-hook threshold to be slightly higher than the off-hook to on-hook threshold. Taking into account the hysteresis voltage, the typical value of RD for the on-hook to off-hook condition is: RD = I--O-----N-----–----H----O-----O----K----4--t-6-o---5--O-----F---F-----–----H----O----O-----K-- (EQ. 25) Taking into account the hysteresis voltage, the typical value of RD for the off-hook to on-hook condition is: RD = ---------------------------------3---7----5---------------------------------- IOFF – HOOK to ON – HOOK (EQ. 26) A ﬁlter capacitor (CD) in parallel with RD will improve the accuracy of the trip point in a noisy environment. The value of this capacitor is calculated using the following Equation: CD = R---T--D-- (EQ. 27) where: T = 0.5ms. Ring Trip Detector Ring trip detection is accomplished with the internal ring trip comparator and the external circuitry shown in Figure 18. The process of ring trip is initiated when the logic input pins are in the following states: E0 = 0, C1 = 1 and C2 = 0. This logic condition connects the ring trip comparator to the DET output, and causes the Ringrly pin to energize the ring relay. The ring relay connects the tip and ring of the phone to the external circuitry in Figure 18. When the phone is on-hook the DT pin is more positive than the DR pin and the DET output is high. For off-hook conditions DR is more positive than DT and DET goes low. When DET goes low, indicating that the phone has gone off-hook, the SLIC is commanded by the logic inputs to go into the active state. In the active state, tip and ring are once again connected to the phone and normal operation ensues. Figure 18 illustrates battery backed unbalanced ring injected ringing. For tip injected ringing just reverse the leads to the phone. The ringing source could also be balanced. NOTE: The DET output will toggle at 20Hz because the DT input is not completely ﬁltered by CRT. Software can examine the duty cycle and determine if the DET pin is low for more that half the time, if so the off-hook condition is indicated. TIP RING CASE 1 CASE 2 CASE 3 IMETAL- LIC ← ILONGITUDI- NAL ← ILONGITUDI- NAL → +- R1 R2 - + gm1(IMETALLIC) gm1 CURRENT LOOP COMPARATOR RH +- - VREF 1.25V RD IRD RD VEE -5V CD DIGITAL MULTIPLEXER DET HC5515 FIGURE 17. LOOP CURRENT DETECTOR 65 11 Page

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