HC55183, HC55184 August 1998 File Number 4550.2 PRELIMINARY
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This data sheet been combined with document FN4519 Please HC5518X (FN4519)
HC55183, HC55184
August 1998 File Number 4550.2
PRELIMINARY
Short Loop Ringing SLIC
Features
Integrated Battery Switch Silent Polarity Reversal Standby Power Consumption (48V, 25mW) Battery Operation 75V, Sinusoidal Trapezoidal Ringing Capability External Component Count Integrated Characteristics On-Hook Transmission Ground Detector 45dB Longitudinal Balance Thermal Alarm Indicator
55184) thor features across these products include: power bject (Harris Semiconductor, Telecom,trapezoidal waveforms ywords consumption, Ringing using sine SLICs, ACs, Telephone, Telephony, WLL, Wireless Local Loop with robust detection mechanisms when subscribers ging PBX, Privateoff hook, Reduced external Cen- count Branch Exchange, NT1+, component integrating application components chip. Office, DLC, Digital Loop Carrier, POTS, Plain HC55184 Ringing SLIC provides Automatic Branch thor Service, PABX, Privatefull silent polarity reversal phone transmission signalling. ywords Pair Gain, Pairgain, BORSCHT, Line Interhange, architecture these products based upon rris Card Interface, Analog Port, Short Loop, Line RSLIC18voltage feed Main design that uses micon-DAML, Digitally Added amplifierLine, Internet fixed ging, loop gains achieve high analog performance with phony, Computer Telephony Integration, CIT, CTI, susceptibility system induced noise. Small Office Home Office, KSU, System com, Subscriber Interface, Subscriber Line Interface, ACs, Integrated Services Digital Network, ONU, OptiNetwork Units, RSU, Remote Switching Units, phone, mote Terminals, Terminal Adapters, Channel phony, Wire- Banks, Office, Crosspoints, Analog Channel sspoints, Access, Line Access, Ring Generator, TRLocal TR-909, CCITT, LSSGR, DTMF, Dual Tone Multi PBX, quency Receiver, Dual Tone Multi Frequency Transate nchPCM, Pulse Code Modulated Repeaters, Pulse hange, Modulated Transcoders, CVSD, Continuously Block Diagram able Slope Delta Modulator, ADSL, PBL3860, L3764A/4, AM79R20, AM79R70, AM79R79) tral ator Digi- pdfmark CINFO
ILIM CONTROL
HC55183 HC55184 Ringing SLICs short loop ringing subscriber line interface circuits (RSLIC) (HC55183, HC55184) features analog Plain providing operational bject (Short Loop Ringing SLIC) interfaces. 55183, Telephone Service (POTS)
Applications
ISDN Terminal Adapters (NT-1+) SOHO Routers Set-Top Boxes Computer Telephony Adapter Cards Related Literature AN9814, User's Guide Development Board AN(TBD), SPICE Macromodel AN(TBD), Interface Techniques CODECs
ageMode /UseOutlines CVIEW pdfmark
BATTERY SWITCH
RINGING PORT
RING
2-WIRE PORT
TRANSMIT SENSING
4-WIRE PORT
DETECTOR LOGIC
CONTROL LOGIC
BSEL
CAUTION: These devices sensitive electrostatic discharge; follow proper Handling Procedures. Copyright Harris Corporation 1998 RSLIC18is trademark Harris Corporation.
HC55183, HC55184 Ordering Information (PLCC package only)
PART NUMBER HC55183ECM HC55184ECM HC5518XEVAL1 RELAY DRIVER 45dB TEMP. RANGE PACKAGE PLCC PLCC PACKAGE N28.45 N28.45
Evaluation Board Platform
Pinouts
HC55183 (PLCC) VIEW
BGND RING ILIM
HC55184 (PLCC) VIEW
BGND RING ILIM NBSEL AGND
BSEL AGND
HC55183, HC55184
Absolute Maximum Ratings
25oC
Thermal Information
Thermal Resistance (Typical, Note (oC/W) PLCC Package. Maximum Junction Temperature Plastic .150oC Maximum Storage Temperature Range -65oC 150oC Maximum Lead Temperature (Soldering 10s) .300oC (PLCC Lead Tips Only)
Maximum Supply Voltages -0.5V VBAT .85V (Human Body Model). .500V
Operating Conditions
Temperature Range Commercial suffix). 75oC Positive Power Supply (VCC) Negative Power Supply (VBAT) .-16V -75V
Characteristics
Substrate Potential. .VBAT Process Bipolar-DI
CAUTION: Stresses above those listed "Absolute Maximum Ratings" cause permanent damage device. This stress only rating operation device these other conditions above those indicated operational sections this specification implied.
NOTE: measured with component mounted evaluation board free air.
Electrical Specifications
Unless Otherwise Specified, 70oC, -75V, -24V, +5V, AGND BGND loop current limit 25mA. parameters specified 2-wire terminating impedance over frequency band 300Hz 3.4kHz. Protection resistors TEST CONDITIONS UNITS
PARAMETER RINGING PARAMETERS Input Impedance Ringing Output Voltage Swing
RLOAD 0.5%, 0.839VRMS RLOAD 1.3K, 2.0%, 0.839VRMS
Centering Voltage Ring Centering Voltage Differential Ringing Gain 4-Wire 2-Wire Ringing Isolation 2-Wire 4-Wire Transmit Isolation
RLOAD RLOAD 2-Wire, RLOAD 0.795VRMS Active Mode, Referenced Input Ringing Mode Referenced Differential Ringing Amplitude
TRANSMISSION PARAMETERS Unless otherwise specified, parameters apply forward active reverse active. Receive Input Impedance Transmit Output Impedance 4-Wire Port Overload Level 2-Wire Port Overload Level 2-Wire Return Loss 2-Wire Longitudinal Balance 4-Wire Longitudinal Balance Logitudinal Current Capability (Per Wire) Grade Grade Test False Detect Test False Detect, Power Standby 2-Wire 4-Wire Insertion Loss 4-Wire 2-Wire Insertion Loss 2-Wire 4-Wire Absolute Gain 4-Wire -4wire Insertion Loss 2-Wire 4-Wire Level Linearity 4-Wire 2-Wire Level Linearity Referenced 0dBm -40dBm, 1kHz -50dBm, 1kHz -55dBm, 1kHz -6.22 -0.20 -6.22 -6.22 -6.02 -0.05 -6.02 -6.02 ±0.025 ±0.05 ±0.10 -5.82 +0.25 -5.82 -5.82 mARMS mARMS
HC55183, HC55184
Electrical Specifications
Unless Otherwise Specified, 70oC, -75V, -24V, +5V, AGND BGND loop current limit 25mA. parameters specified 2-wire terminating impedance over frequency band 300Hz 3.4kHz. Protection resistors (Continued) TEST CONDITIONS C-Message Psophometric Idle Channel Noise 4-Wire C-Message Psophometric -73.5 -79.5 UNITS dBrnC dBmp dBrnC dBmp
PARAMETER Idle Channel Noise 2-Wire
PARAMETERS Unless otherwise specified, parameters apply forward active reverse active. Loop Current Limit Programming Range Loop Current Limit Programming Accuracy Loop Current During Power Standby Open Circuit Voltage (|Tip Ring|) Forward Reverse Active Open Circuit Voltage (Tip Ring) Power Standby Forward Polarity Only BSEL -24V BSEL -75V BSEL -48V BSEL -75V 15.5
LOOP DETECTORS SUPERVISORY FUNCTIONS Switch Hook Programming Range Switch Hook Programming Accuracy Dial Pulse Distortion Ring Trip Comparator Threshold Ring Trip Programming Current Accuracy Ground Threshold Thermal Alarm Output LOGIC INPUTS (F0, SWC) Input Voltage Input High Voltage Input Current Input High Current LOGIC OUTPUTS (DET, ALM) Output Voltage Output High Voltage SUPPLY CURRENTS Forward Reverse Active RLOAD BSEL RLOAD BSEL RLOAD BSEL Forward Reverse Active RLOAD BSEL -75V RLOAD BSEL -75V RLOAD BSEL -75V Power Standby RLOAD BSEL -75V IBL, RLOAD BSEL -75V RLOAD BSEL -75V 0.375 100µA 0.4V 2.4V Junction Temperature Range Assumes External Programming Resistor
HC55183, HC55184
Electrical Specifications
Unless Otherwise Specified, 70oC, -75V, -24V, +5V, AGND BGND loop current limit 25mA. parameters specified 2-wire terminating impedance over frequency band 300Hz 3.4kHz. Protection resistors (Continued) TEST CONDITIONS RLOAD BSEL -75V RLOAD BSEL -75V RLOAD BSEL -75V POWER DISSIPATION Hook Forward Reverse Active, BSEL Forward Reverse Active, BSEL Power Standby, BSEL Ringing, BSEL Hook POWER SUPPLY REJECTION RATIO 2-Wire 300Hz 1kHz 3.4kHz 4-Wire 300Hz 1kHz 3.4kHz 2-Wire 4-Wire 2-Wire 4-Wire 300Hz 3.4kHz 300Hz 3.4kHz 300Hz 3.4kHz 300Hz 1kHz 1kHz 3.4kHz TABLE DEVICE OPERATING MODES OPERATING MODE Power Standby Forward Active Unused Reverse Active Ringing DESCRIPTION compliant standby mode with active loop detector. Forward battery loop feed. This reserved internal test mode. Reverse battery loop feed. Balanced ringing mode supporting both sinusoidal trapezoidal ringing waveforms with offset. This reserved internal test mode. This reserved internal test mode. Device shutdown. Forward Reverse Active UNITS
PARAMETER Ringing
Unused Unused Power Denial
HC55183, HC55184 Design Equations
LOOP SUPERVISION THRESHOLDS Switch Hook Detect switch hook detect threshold single external resistor, Equation used calculate value
(EQ.
4-Wire 2-Wire Gain 4-wire 2-wire gain defined receive gain. function terminating impedance, synthesized impedance protection resistors. Equation calculates receive gain,
(EQ.
term desired loop current threshold. loop current threshold programming range from 15mA. Ground Detect ground detector senses current imbalance between Ring terminals when ring terminal connected ground. ground detect threshold externally programmable internally fixed 12mA regardless switch hook threshold. Ring Trip Detect ring trip detect threshold single external resistor, RRT. between peak ringing current peak hook current while still ringing.
1800 (EQ.
When device source impedance protection resistors equals terminating impedance, receive gain equals unity. 2-Wire 4-Wire Gain 2-wire 4-wire gain (G24). Equation calculates transmit gain.
(EQ.
When protection resistors zero, transmit gain -6dB. Transhybrid Gain transhybrid gain defined 4-wire 4-wire gain (G44).
(EQ.
capacitor will ring trip response time. LOOP CURRENT LIMIT loop current limit device programmed external resistor value calculated using Equation
1760 (EQ.
When protection resistors zero, transhybrid gain -6dB. Complex Impedance Synthesis Substituting impedance programming resistor, with complex programming network provides complex impedance synthesis.
2-WIRE NETWORK PROGRAMMING NETWORK
term ILIM desired loop current limit. loop current limit programming range from 15mA 45mA. IMPEDANCE MATCHING impedance device programmed with external component gain setting resistor feedback amplifier that provides impedance matching. complex impedance matching required, then complex network substituted Resistive Impedance Synthesis source impedance device, calculated Equation
(EQ.
FIGURE COMPLEX PROGRAMMING NETWORK
reference designators programming network match evaluation board. component different design equation than used resistive impedance synthesis. design equations each component provided below.
(EQ. (EQ. (EQ.
required impedance defined terminating impedance protection resistors shown Equation
(EQ.
HC55183, HC55184 Power Standby
Overview power standby mode (LPS, 000) should used during idle line conditions. device designed operate from high battery during this mode. Most internal circuitry powered down, resulting power dissipation. 2-wire (tip/ring) voltage requirements critical during idle line conditions, device operated from battery. Operation from battery will decrease standby power dissipation.
TABLE DEVICE INTERFACES DURING INTERFACE
Receive Ringing Transmit 2-Wire Loop Detect Amplifiers disabled. Switch hook ground key. NOTES transmission, impedance matching ringing disabled during this mode.
Ring relationships apply when operating from battery voltage. high battery voltages (VBH) less than equal internal reference threshold:
RING (EQ.
Loop Current During LPS, device will provide current load. current path through resistors switches, will function hook loop resistance (RLOOP). This includes hook phone resistance copper loop resistance. current available during determined Equation
LOOP LOOP (EQ.
Internal current limiting standby switches will limit maximum current 20mA. Another loop current related parameter longitudinal current capability. longitudinal current capability reduced 10mARMS pin. reduction longitudinal current capability result turning Ring amplifiers. Hook Power Dissipation hook power dissipation device during determined operating voltages quiescent currents calculated using Equation
(EQ.
2-Wire Interface During LPS, 2-wire interface maintained with internal switches voltage references. Ring amplifiers turned conserve power. device will provide compliance, loop current loop supervision. Figure represents internal circuitry providing 2-wire interface during power standby.
RING RING
quiescent current terms specified electrical tables each operating mode. Load power dissipation factor since this hook mode. Some applications specify standby current. standby current charging current required modern telephone electronics. Standby Current Power dissipation standby line current, ISLC introduces additional power dissipation term PSLC Equation illustrates power contribution zero when standby line current zero.
x1200 (EQ.
FIGURE 2-WIRE INTERFACE CIRCUIT DIAGRAM
Compliance Maintenance Termination Unit compliance places voltage requirements 2-wire terminals during idle line conditions. minimum idle voltage 42.75V. voltage expressed difference between Ring. high side range 56V. voltage held near ground through resistor switch. Ring voltage limited maximum -49V REF) when operating from either high battery. switch resistor connect reference Ring terminal. When high battery voltage exceeds reference -49V (typically), Ring terminal will clamped internal reference. same
battery voltage less than -49V (the clamp off), standby line current power contribution reduces Equation
x1200 (EQ.
Most applications specify charging current requirements during standby. When specified, typical charging current high 5mA.
HC55183, HC55184 Forward Active
Overview forward active mode (FA, 001) primary transmission mode device. hook transmission, loop feed voice transmission supported during forward active. Loop supervision provided either switch hook detector ground detector device operated from either high battery. On-Hook Transmission primary purpose hook transmission will support caller other advanced signalling features. transmission over load level while hook 3.5VPEAK When operating from high battery, voltages Ring compliant. typical voltage Ring voltage function battery voltage shown Equation
RING (EQ.
Most applications will operate device from battery while hook. feed characteristic device will drive Ring towards half battery regulate loop current. light loads, will near Ring will near VVBL following diagram shows feed characteristic.
VTR(OC) (VTR/IL)
ILOOP (mA)
ILIM
FIGURE FEED CHARACTERISTIC
Loop supervision provided switch hook detector output. When goes low, battery should selected loop feed voice transmission. Feed Architecture design implements voltage feed current sense architecture. device controls voltage across Ring based sensing load current. Resistors placed series with Ring outputs provide current sensing. diagram below illustrates concept.
VOUT
point y-axis labeled VTR(OC) open circuit Ring voltage defined feed battery voltage.
(EQ.
sloped portion curve determines actual loop current given loop conditions. loop conditions determined battery voltage loop impedance. loop impedance protection resistance, copper resistance (ohms/foot) telephone hook resistance.
ILIM ILOOP (mA)
RLOOP
RKNEE
FIGURE ILOOP VERSUS RLOOP LOAD CHARACTERISTIC
FIGURE VOLTAGE FEED CURRENT SENSE DIAGRAM
monitoring current amplifier output, negative feedback mechanism sets output voltage defined load. amplifier gains resistor ratios providing performance benefits matched resistors. sense resistor, much smaller than gain resistors typically this device. feedback mechanism, represents amplifier configuration providing negative feedback. Loop Feed feedback mechanism monitoring portion loop current loop detector. pass filter used feedback block voice band signals from interfering with loop current limit function. pole pass filter external capacitor value external capacitor fixed 4.7µF.
slope feed characteristic battery voltage define maximum loop current shortest possible loop short circuit current ISC.
-10e3 (EQ.
term ILIM programmed current limit, 1760/RIL line segment represents constant current region loop current limit function.
LOOP -10e3 (EQ.
maximum loop impedance programmed loop current defined RKNEE
KNEE (EQ.
HC55183, HC55184
When RKNEE exceeded, device will transition from constant current feed constant voltage, resistive feed. line segment represents resistive feed portion load characteristic.
LOOP (EQ.
maintain voice quality. Most applications will summing amplifier CODEC front shown below cancel echo signal.
HC5518x CODEC
Voice Transmission feedback mechanism monitoring portion loop current consists amplifiers, sense amplifier (SA) transmit amplifier (TA). feedback signal used impedance synthesis. detailed model feed back loop provided below.
RING
+2.4V
FIGURE TRANSHYBRID BALANCE INTERFACE
resistor ratio, provides final adjustment transmit gain, transmit gain calculated using Equation
(EQ.
0.75R
Most applications hence device 2-wire 4-wire equals transmit gain. Typically greater than prevent loading device transmit output. resistor ratio, determined transhybrid gain device, previously defined transmit gain requirement calculated using Equation
(EQ.
FIGURE SIGNAL TRANSMISSION MODEL
gain transmit amplifier, determines programmed impedance device. capacitor blocks component loop current. ground symbols model represent grounds, actual potentials. sense output voltage, function Ring voltage load calculated using Equation
(EQ.
Power Dissipation power dissipated device during hook transmission strictly function quiescent currents each supply voltage.
(EQ.
transmit amplifier provides programmable gain required impedance synthesis. addition, output this amplifier interfaces CODEC transmit input. output voltage calculated using Equation
(EQ.
hook power dissipation increased above quiescent power dissipation load. loop length less than equal RKNEE device providing constant current, power dissipation calculated using Equation
LOOP (EQ.
Once impedance matching components have been selected using design equations, above equations provide additional insight expected node voltages specific Ring load. Transhybrid Balance final step completing impedance synthesis design calculating necessary gains transhybrid balance. feed back loop produces echo output signal injected echo must cancelled
loop length greater than RKNEE device operating constant voltage, resistive feed region. power dissipated this region calculated using Equation
LOOP (EQ.
Since current relationships different constant current versus constant voltage, region device operation critical valid power dissipation calculations.
HC55183, HC55184 Reverse Active
Overview reverse active mode (RA, 011) provides same functionality forward active mode. hook transmission, loop feed voice transmission supported. Loop supervision provided either switch hook detector ground detector device operated from either high battery. During reverse active Ring voltage characteristics exchange roles. That Ring typically below ground typically more positive than battery. Otherwise, feed voice transmission characteristics identical forward active. Silent Polarity Reversal Changing from forward active reverse active vice versa referred polarity reversal. Many applications require slew rate control polarity reversal event. Requirements range from minimizing cross talk protocol signalling. device uses external voltage capacitor, CPOL reversal time. reversal time independent load conditions. Once programmed, reversal time will remain nearly constant over various load conditions. addition, reversal timing capacitor isolated from loop, therefore loop stability impacted. internal circuitry used polarity reversal time shown below.
Ringing
Overview ringing mode (RNG, 100) provides linear amplification support variety ringing waveforms. programmable ring trip function provides loop supervision auto disconnect upon ring trip. device designed operate from high battery during this mode. Architecture device provides linear amplification signal applied ringing input, differential ringing gain device 80V/V. circuit model ringing path shown following figure.
RING 800K
FIGURE LINEAR RINGING MODEL
voltage gain from input output 40V/V. resistor ratio provides gain current mirror provides gain voltage gain from input Ring output -40V/V. equations Ring outputs during ringing provided below.
(EQ.
CPOL
(EQ.
FIGURE REVERSAL TIMING CONTROL
During forward active, current from source charges external timing capacitor CPOL switch open. internal resistor provides clamping function voltages node. During reverse active, switch closes (roughly twice pulls current from timing capacitor. current node provides drive differential pair which controls reversal time Ring voltages.
time -75e3 (EQ.
When input signal zero, Ring amplifier outputs centered half battery. device provides auto centering easy implementation sinusoidal ringing waveforms. Both control Ring outputs available during ringing. This feature allows offsets part ringing waveform. Ringing Input ringing input, high impedance input. high impedance allows value capacitors coupling ring signal. input enabled only during ringing mode, therefore free running oscillator connected times. When operating from battery -75V, each amplifier, Ring, will swing maximum 70VP-P. Hence, maximum signal swing achieve full scale ringing approximately 2.4VP-P. signal levels compatible with output voltage range CODEC. digital nature CODEC ideally suits function programmable ringing generator. Applications.
Where time required reversal time. Polarized capacitors used CPOL voltage minimal voltage excursion ±0.75V, well suited polarized capacitors. Power Dissipation power dissipation equations forward active operation also apply reverse active mode.
HC55183, HC55184
Logic Control Ringing patterns consist silent intervals. ringing silent pattern called ringing cadence. During silent portion ringing, device programmed other operating mode. most likely candidates power standby forward active. Depending system requirements, high battery selected. Loop supervision provided with ring trip detector. ring trip detector senses change loop current when phone taken hook. loop detector full wave rectifies ringing current, which then filtered with external components CRT. resistor sets trip threshold capacitor sets trip response time. Most applications will require trip response time less than 150ms. Three very distinct actions occur when devices detects ring trip. First, output latched low. latching mechanism eliminates need software filtering detector output. latch cleared when operating mode changed externally. Second, input disabled, removing ring signal from line. Third, device internally forced forward active mode. Power Dissipation power dissipation during ringing dictated load driving requirements ringing waveform. valid power calculations correct definition average currents. average current defines high battery supply current. current defines load current. cadence provides time averaging reduction peak power. total power dissipation consists ringing power, silent interval power,
Power Denial
Overview power denial mode (111) will shutdown entire device except logic interface. Loop supervision provided. This mode used sleep mode shut down presence persistent thermal alarm. Switching between high battery will have effect during power denial. Functionality During power denial, both Ring amplifiers disabled, representing high impedances. voltages both outputs near ground. Thermal Shutdown event safe temperature exceeded, output will will high part will automatically shut down. When device cools, will high will reflect loop status. thermal fault persists, will again part will shut down. Programming power denial will permanently shutdown device stop self cooling cycling.
Battery Switching
Overview integrated battery switch selects between high battery battery. battery switch controlled with logic input BSEL. When BSEL logic high, high battery selected when logic low, battery selected. operating modes device will operate from high battery except forward loop back. Functionality logic control independent operating mode decode. Independent logic control provides most flexibility will support application configurations. When changing device operating states, battery switching should occur simultaneously with prior changing operating mode. most cases, this will minimize overall power dissipation prevent glitches output. only external component required support battery switch diode series with supply lead. event that high battery removed, diode allows device transition battery operation. Battery Operation hook operating conditions should battery. prime benefit will reduced power dissipation. typical battery device -24V. However this increased support longer loop lengths high loop current requirements. Standby conditions also operate from battery compliance required, further reducing standby power dissipation. High Battery Operation Other than ringing, high battery should used standby conditions which must provide compliance. During standby operation power consumption typically 50mW with -75V battery. ringing requirements require full operation, then lower battery will result lower standby power.
(EQ.
terms represent cadence. ringing interval silent interval typical cadence ratio 1:2. quiescent power device ringing mode defined Equation
(EQ.
total power during ringing interval quiescent power loading power:
(EQ.
LOOP
sinusoidal waveforms, average current, IAVG defined Equation
(EQ.
LOOP
silent interval power dissipation will determined quiescent power selected operating mode.
HC55183, HC55184 Basic Application Circuit
CPS1 CPS2 CPS3 ILIM CPOL BSEL AGND BGND
HC5518x
RING
FIGURE HC5518x BASIC APPLICATION CIRCUIT
TABLE BASIC APPLICATION CIRCUIT COMPONENT LIST COMPONENT Ringing SLIC CPOL CPS1 CPS2 CPS3 VALUE HC5518x 49.9k 71.5k 210k 0.47µF 4.7µF 0.1µF 0.1µF 1N400X type with breakdown 100V. Protection resistor values application dependent will determined protection requirements. Standard applications will side. TOLERANCE RATING 0.1W 0.1W 0.1W 0.1W >100V 100V
Design Parameters: Ring Trip Threshold 90mAPEAK Switch Hook Threshold 12mA, Loop Current Limit 24.6mA, Synthesize Device Impedance 210k/400 525, with protection resistors, impedance across Ring terminals 603.
HC55183, HC55184 Additional Application Diagrams
Reducing Overhead Voltages transmission overhead voltage device internally side. overhead voltage reduced injecting negative voltage receive input using voltage divider (Figure 15). Accordingly, 2-wire port overload level will decrease same amount injected offset. injection level, cancellation. value based voice band transhybrid balance requirements. connection teletax source transhybrid amplifier should coupled allow proper biasing transhybrid amplifier input. CODEC Ringing Generation Maximum ringing amplitudes device achieved with signal levels approximately 2.4VP-P. Therefore pass receive output CODEC serve level ring
FROM CODEC
HC5518X
generator. ringing input impedance 480k minimum should interfere with CODEC drive capability. single external capacitor required coupled ringing signal from CODEC. circuit diagram CODEC ringing shown below.
FIGURE EXTERNAL OVERHEAD CONTROL
divider shunt resistance parallel combination internal 160k resistor external should greater than 500k minimize additional power dissipation divider. gain relationship from divider voltage, Ring outputs shown below.
(EQ.
480K HC5518X CODEC
With battery voltage -24V divider voltage -0.5V, Ring voltage 17V. result, overhead voltage reduced from overload level will decrease from 3.5VPEAK 3.0VPEAK Implementing Teletax Signalling resistor required input device injecting teletax signal (Figure 16). most applications synthesized device impedance (i.e, 600) will match teletax impedance. gain cancels impedance matching feedback with respect teletax injection point. Therefore device appears impedance source teletax. resistor calculated using following equation.
(EQ.
FIGURE CODEC RINGING INTERFACE
Ringing With Offsets balanced ringing waveform consists zero offset between Ring terminals. However, linear amplifier architecture provides control offset during ringing. gain same gain, 40V/V amplifier. Positive offsets applied directly ringing input will shift both Ring away from half battery towards ground battery respectively. voltage divider ringing input used generate offset (Figure 18). reference voltage, VREF, either CODEC 2.4V reference voltage supply.
480K HC5518X VREF
FROM RING GEN.
signal level across load will twice injected teletax signal level. teletax level will equal
TELETAX SOURCE +2.4V CODEC
FIGURE EXTERNAL OVERHEAD CONTROL
FIGURE TELETAX SIGNALLING
offset during ringing 30V, would require shift Ring. offset would created +0.375V (VD) input. divider resistors should selected minimize value coupling capacitor loading ring generator voltage reference.The ringing input impedance should also accounted divider resistor calculations.
HC55183, HC55184 Descriptions
PLCC SYMBOL BGND power amplifier output. Battery Ground connected zero potential. loop current longitudinal current flow from this ground. Internally separate from AGND recommended that connected same potential AGND. battery supply connection. High battery supply connection. Connect Connect Connect Mode control input MSB. F2-F0 compatible parallel control interface controlling various modes operation device. Mode control input. Mode control input. Detector Output Selection Input. This input controls multiplexing comparator outputs output based upon state F2-F0 pins. Detector Output This output provides hook status loop based upon selected operating mode. detected output will either switch hook, ground ring trip. Thermal Shutdown Alarm. This signals internal temperature exceeded safe operating temperature device been powered down automatically. Analog ground reference. This should externally connected BGND. Selects between high battery, with logic selecting high battery logic battery. Connect Capacitor connected this sets polarity reversal slew rate. Ringing Signal Input Analog input driving 2-wire interface while Ring Mode. Analog Receive Voltage 4-wire analog audio input voltage. couples CODEC. Transmit output voltage Output impedance matching amplifier, couples CODEC. Feedback voltage impedance matching. This voltage scaled accomplish impedance matching. Impedance matching amplifier summing node. Positive voltage power supply. Biasing Filter Capacitor Connects between this Ring trip filter network. Loop Current Limit programming resistor. Switch hook detection threshold programming resistor. RING power amplifier output. DESCRIPTION
AGND BSEL ILIM RING
HC55183, HC55184 Plastic Leaded Chip Carrier Packages (PLCC)
0.042 (1.07) 0.048 (1.22) IDENTIFIER 0.042 (1.07) 0.056 (1.42) 0.050 (1.27)
N28.45 (JEDEC MS-018AB ISSUE
0.004 (0.10)
LEAD PLASTIC LEADED CHIP CARRIER PACKAGE INCHES SYMBOL 0.165 0.090 0.485 0.450 0.191 0.485 0.450 0.191 0.180 0.120 0.495 0.456 0.219 0.495 0.456 0.219 MILLIMETERS 4.20 2.29 12.32 11.43 4.86 12.32 11.43 4.86 4.57 3.04 12.57 11.58 5.56 12.57 11.58 5.56 NOTES Rev. 11/97
0.025 (0.64) 0.045 (1.14)
D2/E2 D2/E2 VIEW
0.020 (0.51) PLCS
0.020 (0.51)
SEATING PLANE 0.026 (0.66) 0.032 (0.81) 0.013 (0.33) 0.021 (0.53)
0.045 (1.14)
0.025 (0.64) VIEW TYP.
NOTES: Controlling dimension: INCH. Converted millimeter dimensions necessarily exact. Dimensions tolerancing ANSI Y14.5M-1982. Dimensions include mold protrusions. Allowable mold protrusion 0.010 inch (0.25mm) side. Dimensions include mold mismatch measured extreme material condition body parting line. measured seating plane contact point. Centerline determined where center leads exit plastic body. number terminal positions.
HC55183, HC55184
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