PDF HC5503 Data sheet ( Hoja de datos )

Número de pieza	HC5503
Descripción	Low Cost 24V SLIC For PABX/Key Systems
Fabricantes	Intersil Corporation
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No Preview Available ! HC5503 March 1999 File Number 4344.3 Low Cost 24V SLIC For PABX/Key Systems The Intersil HC5503 low cost SLIC is optimized for use in small Analog or mixed Analog and Digital Key Telephone Systems (KTS) or PBX products. The low component count solution and surface mount package options, enable a small desktop Key System/PBX product to be achieved. The internal power dissipation of the end product is minimized by the low power consumption and minimal power supply voltage requirements of the HC5503. The HC5503 integrated solution provides higher quality, higher reliability and better performance solution than a transformer, thick ﬁlm hybrid or discrete analog subscriber interface design. The HC5503 is designed in a Dielectrically isolated bipolar technology and is inherently latch proof and does not require hot plug or power supply sequencing precautions. Ordering Information PART NUMBER HC5503CM HC5503CB TEMP. RANGE (oC) PACKAGE 0 to 75 28 Ld PLCC 0 to 75 24 Ld SOIC PKG. NO. N28.45 M24.3 Block Diagram Description • Wide Operating Battery Range (-21V to -44V) • Single Additional +5V Supply • 25mA Short Loop Current Limit • Ring Relay Driver • Switch Hook and Ring Trip Detect • Low On-Hook Power Consumption • On-Hook Transmission • ITU-T Longitudinal Balance Performance • Loop Power Denial Function • Thermal Protection • Supports Tip, Ring or Balanced Ringing Schemes • Low Proﬁle SO and PLCC Surface Mount Packaging • Pin Compatible with Industry Standard HC5504B SLIC Applications • Analog Subscriber Line Interfaces in Analog Key Systems and Digital ISDN PABX Systems • Related Literature - AN571, Using Ring Sync with HC-5502A and HC-5504 SLICs RD RFS C2 TIP TF RING RF RING RELAY DRIVER RING TRIP DETECTOR 2-WIRE INTERFACE VBAT VCC AGND BGND DGND BIAS LOOP CURRENT DETECTOR THERMAL LIMIT 4-WIRE INTERFACE VF SIGNAL PATH LOGIC INTERFACE TX RX SHD RS RC PD C1 1 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 HC5503 Design Information Line Feed Ampliﬁers The line feed ampliﬁers are high power operational ampliﬁers and are connected to the subscriber loop through 150Ω of feed resistance as shown in Figure 1. The feed resistors and synthesized impedance via feedback provide a 600Ω balanced load for the 2-wire to 4-wire transmission. The tip feed ampliﬁer is conﬁgured as a unity gain noninverting buffer. A -4V bias (derived from the negative battery (VBAT) in the bias network) is applied to the input of the ampliﬁer. Hence, the tip feed DC level is at -4V. The principal reason for this offset is to accommodate sourcing and sinking of longitudinal noise currents up to 15mARMS without saturating the ampliﬁer output and to provide sufﬁcient overhead for receive signals. The tip feed ampliﬁer also feeds the ring feed ampliﬁer, which is conﬁgured as a unity gain inverting ampliﬁer as seen from the tip feed ampliﬁer. The noninverting input to the ring feed amp is biased at a VBAT/2. Looking into this terminal the ampliﬁer has a noninverting gain of 2. Thus, the DC output at ring feed is: VRF(DC) = (4 + VBAT) Volts For a -24V battery, VRF = -20V. Hence, the nominal battery feed across the loop provided by the SLIC is 16V. When the subscriber goes off-hook this DC feed causes current (metallic current) to ﬂow around the loop. The received audio signal RX is fed into the tip feed amplifier and appears at the tip feed terminal. It is also fed through the ring feed amplifier and is inverted. Thus, a differential signal of 2VRX appears between tip feed and ring feed. The RX signal causes AC audio currents to flow around the loop which are then AC coupled to the earpiece of the telephone set. 2-Wire Impedance Matching The HC5503 is optimized for operation with a -24V battery. Impedance matching to a 600Ω load, is achieved through the combination of the feed resistors (RB1, RB2) and negative feedback through resistor R2 (reference Figure 1). RB1 and RB2 are sense resistors that detect loop current and provide negative feedback to synthesize the remaining 300Ω required to match a 600Ω line. The impedance looking into the tip terminal is 150Ω (RB1) plus the synthesized impedance of the tip ampliﬁer. The synthesized tip impedance is equal to the tip feed voltage Va divided by ∆IL. (Note, the tip feed ampliﬁer is a voltage follower. Thus, the tip feed voltage is equal to the receive input voltage VRX, both are labeled Va.) The synthesized impedance of the ring terminal is calculated the same way and is the ring feed voltage divided by ∆IL. (Note, the ring feed voltage is equal in magnitude to the tip feed voltage, but opposite in phase as a result of the ring feed ampliﬁer gain.) + ∆IL - TIP RB1 150Ω TIP FEED Va +- ZIN RB1 = RB2 = RS = 150Ω 90kΩ RX - + 4VDC (NOTE) TO TRANSHYBRID OP-AMP C3 R3 R1 INPUT FROM VIN CODEC R2 +- +- 2 TX - + +4RS∆IL 4RS∆IL + C4 RING RB2 150Ω - ∆IL + RING FEED RR - + +- VBAT 2 HC5503 (NOTE) NOTE: Grounded for AC analysis. FIGURE 1. IMPEDANCE MATCHING CIRCUITRY 5 5 Page HC5503 Pin Descriptions 28 PIN PLCC 24 PIN DIP/SOIC SYMBOL DESCRIPTION 2 1 TIP An analog input connected to the TIP (more positive) side of the subscriber loop. Functions with the Ring terminal to receive voice signals from the telephone and for loop monitoring purposes. 3 2 RING An analog input connected to the RING (more negative) side of the subscriber loop. Functions with the Tip terminal to receive voice signals from the telephone and for loop monitoring purposes. 4 3 RFS Senses ring side of loop for ring trip detection. During ringing, the ring signal is inserted into the line at this node and RF is isolated from RFS via a relay. 5 4 VCC Positive Voltage Source - Most positive supply. VCC is typically 5V. 6 5 C1 Capacitor #1 - An external capacitor to be connected between this terminal and analog ground. Required for proper operation of the loop current limiting function, and for filtering VBAT. Typical value is 0.3µF, 16V. 7 6 DG Digital Ground - To be connected to zero potential and serves as a reference for all digital inputs and out- puts on the SLIC microcircuit. 9 7 RS Ring Synchronization Input - A TTL - compatible clock input. The clock should be arranged such that a pos- itive pulse transition occurs on the zero crossing of the ring voltage source, as it appears at the RFS termi- nal. For Tip side injected systems, the RS pulse should occur on the negative going zero crossing and for Ring injected systems, on the positive going zero crossing. This ensures that the ring relay activates and deactivates when the instantaneous ring voltage is near zero. If synchronization is not required, the pin should be tied to 5V. 10 8 RD Relay Driver - A low active open collector logic output. When enabled, the external ring relay is energized. 11 9 TF Tip Feed - A low impedance analog output connected to the TIP terminal through a 150Ω feed resistor. Functions with the RF terminal to provide loop current, feed voice signals to the telephone set, and sink longitudinal current. 12 10 RF Ring Feed - A low impedance analog output connected to the RING terminal through a 150Ω feed resistor. Functions with the TF terminal to provide loop current, feed voice signals to the telephone set, and sink longitudinal current. 13 11 VBAT Negative Voltage Source - Most negative supply. VBAT is typically -24V. Frequently referred to as “battery”. 14 12 BG Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows into this ground terminal. 16 13 SHD Switch Hook Detection - A low active LS TTL - compatible logic output. This output is enabled for loop cur- rents exceeding 10.5mA and disabled for loop currents less than 5mA. 18 15 PD Power Denial - A low active TTL - Compatible logic input. When enabled, the switch hook detect (SHD) is not necessarily valid, and the relay driver (RD) output is disabled. 19 16 RC Ring Command - A low active TTL - Compatible logic input. When enabled, the relay driver (RD) output goes low on the next high level of the ring sync (RS) input, as long as the SLIC is not in the power denial state (PD = 0) or the subscriber is not already off-hook (SHD = 0). 25 21 RX Receive Input, Four Wire Side - A high impedance analog input which is internally biased. Capacitive coupling to this input is required. AC signals appearing at this input deferentially drive the Tip feed and Ring feed termi- nals, which in turn drive tip and ring through 150Ω of feed resistance on each side of the line. 26 22 C2 Capacitor #2 - An external capacitor to be connected between this terminal and analog ground. This ca- pacitor prevents false ring trip detection from occurring when longitudinal currents are induced onto the subscriber loop from nearby power lines and other noise sources. Recommended value is 1.0µF, 20V. This capacitor should be nonpolarized. 27 23 AG Analog Ground - To be connected to zero potential and serves as a reference for the transmit output (TX) and receive input (RX) terminals. 28 24 TX Transmit Output, Four Wire Side - A low impedance analog output which represents the differential voltage across Tip and Ring. Transhybrid balancing must be performed beyond this output to completely implement two to four wire conversion. This output is unbalanced and referenced to analog ground. Since the DC level of this output varies with loop current, capacitive coupling to the next stage is essential. 17 14 NC Used during production testing. For proper operation of the SLIC, this pin should float. 1, 8, 15, 20, 21, 22, 23, 24 17, 18, 19, 20 NC No internal connection. NOTE: All grounds (AG, BG, and DG) must be applied before VCC or VBAT. Failure to do so may result in premature failure of the part. If a user wishes to run separate grounds off a line card, the AG must be applied ﬁrst. 11 11 Page

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