PDF HC5526CP Data sheet ( Hoja de datos )

Número de pieza	HC5526CP
Descripción	ITU CO/PABX SLIC with Low Power Standby
Fabricantes	Intersil Corporation
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No Preview Available ! Data Sheet HC5526 October 1998 File Number 4151.6 ITU CO/PABX SLIC with Low Power Standby The HC5526 is a subscriber line interface circuit that is compliant with CCITT standards. Enhancements include immunity to circuit latch-up during hot plug and absence of false signaling in the presence of longitudinal currents. The HC5526 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 (JI) 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 HC5526 ideally suited for use in harsh outdoor environments. Ordering Information PART NUMBER HC5526CM HC5526CP HC5526IM HC5526IP 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 Block Diagram Features • DI Monolithic High Voltage Process • Programmable Current Feed (20mA to 60mA) • Programmable Loop Current Detector Threshold and Battery Feed Characteristics • Ground Key and Ring Trip Detection • Compatible with Ericsson’s PBL3764 • Thermal Shutdown • On-Hook Transmission • Wide Battery Voltage Range (-24V to -58V) • Low Standby Power • Meets CCITT Transmission Requirements • -40oC to 85oC Ambient Temperature Range Applications • On-Premises (ONS) • Key Systems • PBX • Related Literature - AN9537, Operation of the HC5513/26 Evaluation Board 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 GROUND KEY DETECTOR 4-WIRE INTERFACE VF SIGNAL PATH DIGITAL MULTIPLEXER VTX RSN E0 E1 C1 C2 DET RD RDC RSG 57 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 HC5526 Electrical Speciﬁcations TA = 0oC to 70oC, VCC = 5V ±5%, VEE = -5V ±5%, VBAT = -28V, AGND = BGND = 0V, RDC1 = RDC2 = 41.2kΩ, RD = 39kΩ, RSG = ∞, 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) PARAMETER CONDITIONS MIN TYP MAX UNITS 4-Wire to 2-Wire -55dBm to -40dBm (Note 22, Figure 9) - ±0.03 - 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 C RL 600Ω IDCMET EG 1/ωC << RL 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) - 10 - dBrnC Idle Channel Noise at 4-Wire C-Message Weighting (Note 24, Figure 10) - 10 - dBrnC 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 GROUND KEY DETECTOR I0Lo=C2to50700/(oRCD(CN1o+teR2D7C) 2), IL = (VBAT-3)/(RL +1800), 0oC to 70oC (Note 28) 0oC to 70oC, (Active) RD = 39kΩ, 0oC to 70oC RD = 39kΩ, 0oC to 70oC RD = 39kΩ, 0oC to 70oC 0.9IL IL 1.1IL mA 0.8IL IL 1.2IL mA 14 - 20 V 372/RD 325/RD 25/RD 465/RD 405/RD 60/RD 558/RD 485/RD 95/RD mA mA mA Tip/Ring Current Difference - Trigger (Note 29, Figure 11) 8 12 17 mA Tip/Ring Current Difference - Reset (Note 29, Figure 11) 3 7 12 mA 61 5 Page HC5526 VTX RTX I2 HC5526 ZT I1 ZB RFB - + + VTX - RSN ZRX + VRX - CODEC/ FILTER FIGURE 17. TRANSHYBRID CIRCUIT Supervisory Functions The loop current, ground key and the ring trip detector outputs are multiplexed to a single logic output pin called DET. See Table 1 to determine the active detector for a given logic input. For further discussion of the logic circuitry see section titled “Digital Logic Inputs”. Before proceeding with an explanation of the loop current detector, ground key detector and later the longitudinal impedance, it is important to understand the difference between a “metallic” and “longitudinal” loop currents. Figure 18 illustrates 3 different types of loop current encountered. Case 1 illustrates the metallic loop current. The deﬁnition of a metallic loop current is when equal currents ﬂow out of tip and into ring. Loop current is a metallic current. 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 18). 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 18 shows a simplified schematic of the loop current and ground key detectors. 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-----–-----I--R----I--N----G---- 600 = ---I--L---- 300 (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 = I--O-----F----F----–----H----O-----O----K-3---7--t--5o-----O-----N-----–----H----O----O-----K-- (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-- where: T = 0.5ms. (EQ. 27) Ground Key Detector A simplified schematic of the ground key detector is shown in Figure 18. Ground key, is the process in which the ring terminal is shorted to ground for the purpose of signaling an Operator or seizing a phone line (between the Central Office and a Private Branch Exchange). The Ground Key detector is activated when unequal current flow through resistors R1 and R2. This results in a current (IGK) out of the transconductance amplifier (gm2) that is equal to the product of gm2 and the differential (ITIP -IRING) loop current. If IGK is less than the internal current source (I1), then diode D1 is on and the output of the ground key comparator is low. If IGK is greater than the internal current source (I1), then diode D2 is on and the output of the ground key comparator is high. With the output of the ground key comparator high, and the logic configured for ground key detect, the DET pin goes low. The ground key detector has a built in hysteresis of typically 5mA between its trigger and reset values. Ring Trip Detector Ring trip detection is accomplished with the internal ring trip comparator and the external circuitry shown in Figure 19. The process of ring trip is initiated when the logic input pins are in the following states: E0 = 0, E1 = 1/0, 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 19. 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. 67 11 Page

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